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Journal articles on the topic 'Spectroradiometer'

Author: Grafiati

Published: 4 June 2021

Last updated: 7 September 2023

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1

Jäkel, Evelyn, Manfred Wendisch, Mario Blumthaler, Rainer Schmitt, and Ann R. Webb. "A CCD Spectroradiometer for Ultraviolet Actinic Radiation Measurements." Journal of Atmospheric and Oceanic Technology 24, no. 3 (March 1, 2007): 449–62. http://dx.doi.org/10.1175/jtech1979.1.

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Abstract A new spectroradiometer for spectral measurements of ultraviolet (UV) atmospheric radiation (290–400 nm) using a charge coupled device (CCD) as a detector is introduced. The instrument development is motivated by the need for measurements with (a) high accuracy in the UV-B spectral range (290–315 nm) for photochemistry applications and (b) high temporal resolution in quickly changing atmospheric conditions such as partial cloud cover. The new CCD instrument is mainly intended for airborne use. It allows fast data collection (<300 ms time resolution for each spectrum) with improved sensitivity in the UV spectral range. The instrumental setup and its characterization in terms of stray light, dark current, noise, and detection limits are described and compared to a spectroradiometer with a photodiode array (PDA) detector. The new CCD spectroradiometer has a one order of magnitude greater sensitivity than the PDA-based spectroradiometer. However, the stray light of the CCD instrument is wavelength dependent, which requires a more complicated data evaluation procedure than the PDA instrument. Comparison with other UV spectroradiometers (a PDA spectroradiometer and two ground-based double monochromators) shows the advantages of the CCD system for UV-B measurements of actinic flux densities and photolysis frequencies of ozone and nitrogen dioxide, and the improved performance compared to PDA spectroradiometers.

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2

Chmielinski, Maximilian J., Martin A. Cohen, Michael G. Yost, and Christopher D. Simpson. "Wearable Spectroradiometer for Dosimetry." Sensors 22, no. 22 (November 15, 2022): 8829. http://dx.doi.org/10.3390/s22228829.

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Available wearable dosimeters suffer from spectral mismatch during the measurement of broadband UV and visible radiation in environments that receive radiation from multiple sources emitting differing spectra. We observed this type of multi-spectra environment in all five Washington State cannabis farms visited during a field study investigating worker exposure to ultraviolet radiation in 2018. Spectroradiometers do not suffer from spectral mismatch in these environments, however, an extensive literature review conducted at the time of writing did not identify any spectroradiometers that were directly deployable as wearable dosimetry devices. To close this research gap, we developed a microcontroller system and platform that allows for researchers to mount and deploy the Ocean Insight Flame-S Spectroradiometer as a wearable device for measurement of UV and visible wavelengths (300 to 700 nm). The platform validation consisted of comparing measurements taken under platform control with measurements taken with the spectrometer controlled by a personal computer running the software provided by the spectroradiometer manufacturer. Three Mann–Whitney U-Tests (two-tailed, 95% CI), one for each intensity condition, compared the central tendency between the total spectral power (TSP), the integral of a spectrum measurement, measured under both control schemas. An additional analysis of per pixel agreement and overall platform stability was performed. The three Mann–Whitney tests returned no significant difference between the set of TSPs for each filter condition. These results suggest that the spectroradiometer takes measurements of equivalent accuracy under both control schemas, and can be deployed as a wearable device for the measurement of wavelength resolved UV and visible radiation.

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3

Jiao, Zhaoqiang, Yiwen Li, Ge Chen, Yao Li, Shijie Chai, and Puyousen Zhang. "Correction of Spatial Nonuniformity in Spectroradiometer Field-of-View Using a Concentric-Circles Method." Photonics 9, no. 2 (January 21, 2022): 56. http://dx.doi.org/10.3390/photonics9020056.

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Spectroradiometers exhibit the smallest aberration and the optimum response at the field-of-view (FOV) center. The aberration increases and the response deteriorates at positions further away from the FOV center, which leads to nonuniformity in the spectroradiometer FOV. In this study, a concentric-circles method for correcting the spectroradiometer FOV nonuniformity was developed. The calibration experiment for FOV nonuniformity was conducted by establishing the experimental platform. The nonuniformity correction coefficients were obtained and then used to fit the correction function curve within the whole FOV, allowing for correction of measurement targets with an arbitrary shape. The radiation intensity of the blackbody at different temperatures was obtained by measurement, and the nonuniformity coefficient was used to correct it. After correction, the error was within 1.84% for the spectrally integrated radiant intensity in the non-absorption band. Using this correction method, efficient calibration of spectroradiometer nonuniformity can be achieved, thereby enhancing the measurement accuracy of the spectroradiometer.

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4

Vaskuri, Anna, Petri Kärhä, Luca Egli, Julian Gröbner, and Erkki Ikonen. "Uncertainty analysis of total ozone derived from direct solar irradiance spectra in the presence of unknown spectral deviations." Atmospheric Measurement Techniques 11, no. 6 (June 20, 2018): 3595–610. http://dx.doi.org/10.5194/amt-11-3595-2018.

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Abstract. We demonstrate the use of a Monte Carlo model to estimate the uncertainties in total ozone column (TOC) derived from ground-based direct solar spectral irradiance measurements. The model estimates the effects of possible systematic spectral deviations in the solar irradiance spectra on the uncertainties in retrieved TOC. The model is tested with spectral data measured with three different spectroradiometers at an intercomparison campaign of the research project “Traceability for atmospheric total column ozone” at Izaña, Tenerife on 17 September 2016. The TOC values derived at local noon have expanded uncertainties of 1.3 % (3.6 DU) for a high-end scanning spectroradiometer, 1.5 % (4.4 DU) for a high-end array spectroradiometer, and 4.7 % (13.3 DU) for a roughly adopted instrument based on commercially available components and an array spectroradiometer when correlations are taken into account. When neglecting the effects of systematic spectral deviations, the uncertainties reduce by a factor of 3. The TOC results of all devices have good agreement with each other, within the uncertainties, and with the reference values of the order of 282 DU during the analysed day, measured with Brewer spectrophotometer #183.

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5

Brogniez, C., V. Buchard, and F. Auriol. "Validation of UV-visible aerosol optical thickness retrieved from spectroradiometer measurements." Atmospheric Chemistry and Physics Discussions 8, no. 1 (February 26, 2008): 3895–919. http://dx.doi.org/10.5194/acpd-8-3895-2008.

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Abstract. Global and diffuse UV-visible solar irradiances are routinely measured since 2003 with a spectroradiometer operated by the Laboratoire d'Optique Atmosphérique (LOA) located in Villeneuve d'Ascq, France. The analysis of the direct irradiance derived by cloudless conditions enables retrieving the aerosol optical thickness (AOT) spectrum in the 330–450 nm range. The site hosts also sunphotometers from the AERONET/PHOTONS network performing routinely measurements of the AOT at several wavelengths. On one hand, comparisons between the spectroradiometer and the sunphotometer AOT at 440 nm as well as, when available, at 340 and 380 nm, show good agreement. On the other hand, the AOT's spectral variations have been compared using the Angström exponents derived from AOT data at 340 and 440 nm for both instruments. The comparisons show that this parameter is difficult to retrieve accurately due to the small wavelength range and due to the weak AOT values. Thus, AOT derived at wavelengths outside the spectroradiometer range by means of an extrapolation using the Angström parameter would be of poor value, whereas, spectroradiometer's spectral AOT could be used for direct validation of other AOT, such as those provided by satellite instruments.

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6

KAUFMANN, WOLFGANG F., and KARL M. HARTMANN. "LOW COST DIGITAL SPECTRORADIOMETER." Photochemistry and Photobiology 49, no. 6 (June 1989): 769–74. http://dx.doi.org/10.1111/j.1751-1097.1989.tb05575.x.

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7

Egli, L., J. Gröbner, G. Hülsen, L. Bachmann, M. Blumthaler, J. Dubard, M. Khazova, et al. "Quality assessment of solar UV irradiance measured with array spectroradiometers." Atmospheric Measurement Techniques Discussions 8, no. 12 (December 21, 2015): 13609–44. http://dx.doi.org/10.5194/amtd-8-13609-2015.

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Abstract. The reliable quantification of ultraviolet (UV) radiation at the Earth's surface requires accurate measurements of spectral global solar UV irradiance in order to determine the UV exposure to human skin and to understand long-term trends in this parameter. Array spectroradiometers are small, light, robust and cost effective instruments and are increasingly used for spectral irradiance measurements. Within the European EMRP-ENV03 project "Solar UV", new devices, guidelines, and characterization methods have been developed to improve solar UV measurements with array spectroradiometers and support to the end-user community has been provided. In order to assess the quality of 14 end-user array spectroradiometers, a solar UV intercomparison was held on the measurement platform of the World Radiation Center (PMOD/WRC) in Davos, Switzerland, from 10 to 17 July 2014. The results of the intercomparison revealed that array spectroradiometers, currently used for solar UV measurements, show a large variation in the quality of their solar UV measurements. Most of the instruments overestimate the erythema weighted UV index – in particular at low solar zenith angles – due to stray light contribution in the UV-B range. The spectral analysis of global solar UV irradiance further supported the finding that the uncertainties in the UV-B range are very large due to stray light contribution in this wavelength range. In summary, the UV index may be detected by some commercially available array spectroradiometer within 5 % compared to the world reference spectroradiometer, if well characterized and calibrated, but only for a limited range or solar zenith angle. Generally, the tested instruments are not yet suitable for solar UV measurements for the entire range between 290 to 400 nm under all atmospheric conditions.

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8

Gröbner, Julian, Herbert Schill, Luca Egli, and René Stübi. "Consistency of total column ozone measurements between the Brewer and Dobson spectroradiometers of the LKO Arosa and PMOD/WRC Davos." Atmospheric Measurement Techniques 14, no. 5 (May 6, 2021): 3319–31. http://dx.doi.org/10.5194/amt-14-3319-2021.

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Abstract. Total column ozone measured by Brewer and Dobson spectroradiometers at Arosa and Davos, Switzerland, have systematic seasonal variations of around 1.5 % using the standard operational data processing. Most of this variability can be attributed to the temperature sensitivity of approx. +0.1 %/K of the ozone absorption coefficient of the Dobson spectroradiometer (in this study D101). While the currently used Bass and Paur ozone absorption cross-sections produce inconsistent results for Dobson and Brewer, the use of the ozone absorption cross-sections from Serdyuchenko et al. (2014) in conjunction with an effective ozone temperature dataset produces excellent agreement between the four Brewers investigated (of which two are double Brewers) and Dobson D101. Even though other ozone absorption cross-sections available in the literature are able to reduce the seasonal variability as well, all of those investigated produce systematic biases in total column ozone between Brewer and Dobson of +2.1 % to −3.2 %. The highest consistency in total column ozone from Brewers and Dobson D101 at Arosa and Davos is obtained by applying the Rayleigh scattering cross-sections from Bodhaine et al. (1999), the ozone absorption cross-sections from Serdyuchenko et al. (2014), the effective ozone temperature from either ozone-sondes or the European Centre for Medium-Range Weather Forecasts (ECMWF), and the measured line spread functions of Brewer and Dobson. The variability of 0.9 % between Brewer and Dobson for single measurements can be reduced to less than 0.1 % for monthly means. As shown here, the applied methodology produces consistent total column ozone datasets between Brewer and Dobson spectroradiometers, with average differences of 0.0 % and a remaining seasonal variability of 0.11 %. For collocated Brewer and Dobson spectroradiometers, as is the case for the Arosa and Davos total column ozone times series, this allows for the merging of these two distinct datasets to produce a homogeneous time series of total column ozone measurements. Furthermore, it guarantees the long-term future of this longest total column ozone time series, by proposing a methodology for how to eventually replace the ageing Dobson spectroradiometer with the state-of-the art Brewer spectroradiometer.

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9

Corredera, Pedro, Antonio Corrons, Joaquin Campos, and Alicia Pons. "Realization of an infrared spectroradiometer." Applied Optics 30, no. 10 (April 1, 1991): 1279. http://dx.doi.org/10.1364/ao.30.001279.

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10

Brogniez, C., V. Buchard, and F. Auriol. "Validation of UV-visible aerosol optical thickness retrieved from spectroradiometer measurements." Atmospheric Chemistry and Physics 8, no. 16 (August 12, 2008): 4655–63. http://dx.doi.org/10.5194/acp-8-4655-2008.

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Abstract. Global and diffuse UV-visible solar irradiances are routinely measured since 2003 with a spectroradiometer operated by the Laboratoire d'Optique Atmosphérique (LOA) located in Villeneuve d'Ascq, France. The analysis of the direct irradiance derived by cloudless conditions enables retrieving the aerosol optical thickness (AOT) spectrum in the 330–450 nm range. The site hosts also sunphotometers from the AERONET/PHOTONS network performing routinely measurements of the AOT at several wavelengths. On one hand, comparisons between the spectroradiometer and the sunphotometer AOT at 440 nm as well as, when available, at 340 and 380 nm, show good agreement: in 2003–2005 at 440 nm the correlation coefficient, the slope and the intercept of the regression line are [0.97, 0.95, 0.025], and in 2006 at 440, 380 and 340 nm they are [0.97, 1.00, −0.013], [0.97, 0.98, −0.007], and [0.98, 0.98, −0.002] respectively. On the other hand, the AOT's spectral variations have been compared using the Angström exponents derived from AOT data at 340 and 440 nm for both instruments. The comparisons show that this parameter is difficult to retrieve accurately due to the small wavelength range and due to the weak AOT values. Thus, AOT derived at wavelengths outside the spectroradiometer range by means of an extrapolation using the Angström parameter would have large uncertainties, whereas spectroradiometer's spectral AOT could be used for direct validation of other AOT, such as those provided by satellite instruments.

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11

Qi, Zhaoyang, Jianyu Li, Wenqing Xu, Wenyue Zhu, Fengying Sun, Yao Huang, Gang Xu, and Congming Dai. "Optomechanical Design and Application of Solar-Skylight Spectroradiometer." Sensors 21, no. 11 (May 28, 2021): 3751. http://dx.doi.org/10.3390/s21113751.

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Using a solar radiometer is an effective approach for improving the remote sensing of solar irradiance distribution and atmospheric composition. Long-term development of a solar scanning radiometer enables frequent and reliable measurement of atmospheric parameters such as the water vapor column and aerosol optical properties. However, the discrete wavelength radiometer has encountered a bottleneck with respect to its insufficient spectral resolution and limited observation waveband, and it has been unable to satisfy the needs of refined and intelligent on-site experiments. This study proposes a solar-skylight spectroradiometer for obtaining visible and near-IR fine spectrum with two types of measurement: direct-sun irradiance and diffuse-sky radiance. The instrument adopts distributed control architecture composed of the ARM-Linux embedded platform and sensor networks. The detailed design of the measuring light-path, two-axis turntable, and master control system will be addressed in this study. To determine all coefficients needed to convert instrument outputs to physical quantities, integrating sphere and Langley extrapolation methods are introduced for diffuse-sky and direct-sun calibration, respectively. Finally, the agreement of experimental results between spectroradiometers and measuring benchmarks (DTF sun-photometer, microwave radiometer, and Combined Atmospheric Radiative Transfer simulation) verifies the feasibility of the spectroradiometer system, and the radiation information of feature wavelengths can be used to retrieve the characteristics of atmospheric optics.

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12

Wuttke, Sigrid, Gunther Seckmeyer, Germar Bernhard, James Ehramjian, Richard McKenzie, Paul Johnston, and Michael O'Neill. "New Spectroradiometers Complying with the NDSC Standards." Journal of Atmospheric and Oceanic Technology 23, no. 2 (February 1, 2006): 241–51. http://dx.doi.org/10.1175/jtech1826.1.

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Abstract The investigation of the effect of solar ultraviolet (UV) and visible radiation on biological organisms and photochemical reactions requires spectral measurements of the desired radiation parameters of high accuracy. The Network for the Detection of Stratospheric Change (NDSC) and the World Meteorological Organization have set up stringent requirements for high-quality spectral measurements of ultraviolet radiation. It is shown that two new instruments comply with these standards. One is the newly developed spectroradiometer of the Institute of Meteorology and Climatology, University of Hannover, Hannover, Germany. It is capable of covering the spectral range from the UV to the near-infrared (290–1050 nm) in a comparably fine resolution. One major aim is to deploy this instrument as a traveling NDSC spectroradiometer. The other new instrument is built for the U.S. National Science Foundation's UV Monitoring Network. It is designed to monitor UV and visible irradiance at high latitudes and covers a wavelength range from 280 to 600 nm. Data of both instruments show deviations of less than 5% for a wide range of atmospheric conditions compared to a NDSC spectroradiometer owned by the Climate Monitoring and Diagnostics Laboratory during the fifth North American Interagency Intercomparison for UV Spectroradiometers. Such deviations represent state-of-the-art instrumentation for conducting long-term measurements of solar UV radiation capable of detecting trends and supporting long-term measurements by traveling standards. Furthermore, there is now an instrument capable of measuring solar irradiance in a wavelength range from 250 to 1050 nm.

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13

González, Carmen, José M. Vilaplana, José A. Bogeat, and Antonio Serrano. "Comparison of global UV spectral irradiance measurements between a BTS CCD-array and a Brewer spectroradiometer." Atmospheric Measurement Techniques 15, no. 13 (July 15, 2022): 4125–33. http://dx.doi.org/10.5194/amt-15-4125-2022.

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Abstract. Spectral measurements of UV irradiance are of great importance for protecting human health as well as for supporting scientific research. To perform these measurements, double monochromator scanning spectroradiometers are the preferred devices thanks to their linearity and stray-light reduction. However, because of their high cost and demanding maintenance, CCD-array-based spectroradiometers are increasingly used for monitoring UV irradiance. Nevertheless, CCD-array spectroradiometers have specific limitations, such as a high detection threshold or stray-light contamination. To overcome these challenges, several manufacturers are striving to develop improved instrumentation. In particular, Gigahertz-Optik GmbH has developed the stray-light-reduced BTS2048-UV-S spectroradiometer series (hereafter “BTS”). In this study, the long-term performance of the BTS and its seasonal behavior, regarding global UV irradiance, was assessed. To carry out the analysis, BTS irradiance measurements were compared against measurements from the Brewer MK-III #150 scanning spectrophotometer during three campaigns. A total of 711 simultaneous spectra, measured under cloud-free conditions and covering a wide range of solar zenith angles (SZAs; from 14 to 70∘) and UV indexes (from 2.4 to 10.6), were used for the comparison. During the three measurement campaigns, the global UV spectral ratio BTS / Brewer was almost constant (at around 0.93) in the 305–360 nm region for SZAs below 70∘. Thus, the BTS calibration was stable during the whole period of study (∼ 1.5 years). Likewise, it showed no significant seasonal or SZA dependence in this wavelength region. Regarding the UV index, a good correlation between the BTS and the Brewer #150 was found, i.e., the dynamic range of the BTS is comparable to that of the Brewer #150. These results confirm the quality of the long-term performance of the BTS array spectroradiometer in measuring global UV irradiance.

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14

Rammeloo, Clemens, and Andreas Baumgartner. "Spectroradiometer Calibration for Radiance Transfer Measurements." Sensors 23, no. 4 (February 20, 2023): 2339. http://dx.doi.org/10.3390/s23042339.

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Optical remote sensing and Earth observation instruments rely on precise radiometric calibrations which are generally provided by the broadband emission from large-aperture integrating spheres. The link between the integrating sphere radiance and an SI-traceable radiance standard is made by spectroradiometer measurements. In this work, the calibration efforts of a Spectra Vista Corporation (SVC) HR-1024i spectroradiometer are presented to study how these enable radiance transfer measurements at the Calibration Home Base (CHB) for imaging spectrometers at the Remote Sensing Technology Institute (IMF) of the German Aerospace Center (DLR). The spectral and radiometric response calibrations of an SVC HR-1024i spectroradiometer are reported, as well as the measurements of non-linearity and its sensitivity to temperature changes and polarized light. This achieves radiance transfer measurements with the calibrated spectroradiometer with relative expanded uncertainties between 1% and 3% (k=2) over the wavelength range of 380 nm to 2500 nm, which are limited by the uncertainties of the applied radiance standard.

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15

Miyazaki, Tadakuni, Hiroshi Shimizu, and Yoshifumi Yasuoka. "High-speed spectroradiometer for remote sensing." Applied Optics 26, no. 22 (November 15, 1987): 4761. http://dx.doi.org/10.1364/ao.26.004761.

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16

Krasil’nikov, A. A., Yu Yu Kulikov, V. G. Ryskin, V. M. Demkin, L. M. Kukin, V. L. Mikhailovskii, V. N. Shanin, M. Z. Sheiner, V. A. Shumilov, and A. M. Shchitov. "A new compact microwave spectroradiometer-ozonometer." Instruments and Experimental Techniques 54, no. 1 (January 2011): 118–23. http://dx.doi.org/10.1134/s0020441211010167.

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17

Peterson, Josh, Frank Vignola, Aron Habte, and Manajit Sengupta. "Developing a spectroradiometer data uncertainty methodology." Solar Energy 149 (June 2017): 60–76. http://dx.doi.org/10.1016/j.solener.2017.03.075.

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18

Antón, Manuel, Antonio Serrano, María L. Cancillo, JoséM Vilaplana, Victoria E. Cachorro, and Julian Gröbner. "Correction of Angular Response Error in Brewer UV Irradiance Measurements." Journal of Atmospheric and Oceanic Technology 25, no. 11 (November 1, 2008): 2018–27. http://dx.doi.org/10.1175/2008jtecha1040.1.

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Abstract Ultraviolet spectral irradiance measured by spectroradiometers usually presents high deviations from the ideal angular response due to imperfections in the entrance optics. In this paper a methodology to correct the angular error in the global UV spectral measurements of a Brewer MKIII spectroradiometer under all weather conditions is presented. This methodology calculates the global correction factor as a function of three variables: the direct irradiance correction factor, the diffuse irradiance correction factor, and a factor depending on the direct-to-global irradiance ratio. This work contributes to better measuring the UV radiation by improving the parameterization of the clouds effects. Depending mainly on wavelength, solar zenith angle, and cloud optical thickness, the angular correction obtained ranges from 2% to 9%. The accuracy of this correction is limited by the uncertainties in the measured angular response and in the ratio of direct to global radiation. The original and the corrected Brewer measurements are compared with simultaneous values of the transportable Quality Assurance of Spectral Ultraviolet Measurements in Europe through the Development of a Transportable Unit (QASUME) reference spectroradiometer. A notable decrease (about a factor higher than 2) in the relative differences between the two instruments is obtained when Brewer-corrected measurements are considered.

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19

Li Xin, 李新, 张国伟 Zhang Guowei, 寻丽娜 Xun Lina, 谢萍 Xie Ping, 洪津 Hong Jin, and 郑小兵 Zheng Xiaobing. "Wavelength Calibration of Shortwave Infrared Flat Spectroradiometer." Acta Optica Sinica 28, no. 5 (2008): 902–6. http://dx.doi.org/10.3788/aos20082805.0902.

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20

Dvoruk, S. K., V. N. Kornienko, I. V. Kochikov, M. V. Lel'kov, A. N. Morozov, M. L. Posdyshev, S. I. Svetlichnyĭ, and S. E. Tabalin. "Portable Fourier spectroradiometer with an uncooled photodetector." Journal of Optical Technology 73, no. 11 (November 1, 2006): 797. http://dx.doi.org/10.1364/jot.73.000797.

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21

Harrison, Lee, Mark Beauharnois, Jerry Berndt, Peter Kiedron, Joseph Michalsky, and Qilong Min. "The rotating shadowband spectroradiometer (RSS) at SGP." Geophysical Research Letters 26, no. 12 (June 15, 1999): 1715–18. http://dx.doi.org/10.1029/1999gl900328.

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22

Sicard, M., K. J. Thome, B. G. Crowther, and M. W. Smith. "Shortwave Infrared Spectroradiometer for Atmospheric Transmittance Measurements." Journal of Atmospheric and Oceanic Technology 15, no. 1 (February 1998): 174–83. http://dx.doi.org/10.1175/1520-0426(1998)015<0174:sisfat>2.0.co;2.

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23

Schaepman, Michael E., and Stefan Dangel. "Solid laboratory calibration of a nonimaging spectroradiometer." Applied Optics 39, no. 21 (July 20, 2000): 3754. http://dx.doi.org/10.1364/ao.39.003754.

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24

Peddle, Derek R., H. Peter White, Raymond J. Soffer, John R. Miller, and Ellsworth F. LeDrew. "Reflectance processing of remote sensing spectroradiometer data." Computers & Geosciences 27, no. 2 (March 2001): 203–13. http://dx.doi.org/10.1016/s0098-3004(00)00096-0.

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25

Deniel, Jean-Marc. "Optimizing array spectroradiometer readings using adaptative bracketing." Review of Scientific Instruments 87, no. 3 (March 2016): 033108. http://dx.doi.org/10.1063/1.4943665.

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26

Té, Yao, Pascal Jeseck, Claude Camy-Peyret, Sébastien Payan, Gaetan Perron, and Ginette Aubertin. "Balloonborne calibrated spectroradiometer for atmospheric nadir sounding." Applied Optics 41, no. 30 (October 20, 2002): 6431. http://dx.doi.org/10.1364/ao.41.006431.

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27

Brown, Steven W., and Yoshi Ohno. "NIST Reference Spectroradiometer for Color Display Calibrations." Color and Imaging Conference 6, no. 1 (January 1, 1998): 62–64. http://dx.doi.org/10.2352/cic.1998.6.1.art00013.

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28

McFarlane, Sally A., Roger T. Marchand, and Thomas P. Ackerman. "Retrieval of cloud phase and crystal habit from Multiangle Imaging Spectroradiometer (MISR) and Moderate Resolution Imaging Spectroradiometer (MODIS) data." Journal of Geophysical Research: Atmospheres 110, no. D14 (July 22, 2005): n/a. http://dx.doi.org/10.1029/2004jd004831.

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29

Hanuš, Jan, Lukáš Slezák, Tomáš Fabiánek, Lukáš Fajmon, Tomáš Hanousek, Růžena Janoutová, Daniel Kopkáně, et al. "Flying Laboratory of Imaging Systems: Fusion of Airborne Hyperspectral and Laser Scanning for Ecosystem Research." Remote Sensing 15, no. 12 (June 15, 2023): 3130. http://dx.doi.org/10.3390/rs15123130.

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Synergies of optical, thermal and laser scanning remotely sensed data provide valuable information to study the structure and functioning of terrestrial ecosystems. One of the few fully operational airborne multi-sensor platforms for ecosystem research in Europe is the Flying Laboratory of Imaging Systems (FLIS), operated by the Global Change Research Institute of the Czech Academy of Sciences. The system consists of three commercial imaging spectroradiometers. One spectroradiometer covers the visible and near-infrared, and the other covers the shortwave infrared part of the electromagnetic spectrum. These two provide full spectral data between 380–2450 nm, mainly for the assessment of biochemical properties of vegetation, soil and water. The third spectroradiometer covers the thermal long-wave infrared part of the electromagnetic spectrum and allows for mapping of surface emissivity and temperature properties. The fourth instrument onboard is the full waveform laser scanning system, which provides data on landscape orography and 3D structure. Here, we describe the FLIS design, data acquisition plan and primary data pre-processing. The synchronous acquisition of multiple data sources provides a complex analytical and data framework for the assessment of vegetation ecosystems (such as plant species composition, plant functional traits, biomass and carbon stocks), as well as for studying the role of greenery or blue-green infrastructure on the thermal behaviour of urban systems. In addition, the FLIS airborne infrastructure supports calibration and validation activities for existing and upcoming satellite missions (e.g., FLEX, PRISMA).

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30

Trim, Simon A., Kimberley Mason, and Andreas Hueni. "Spectroradiometer spectral calibration, ISRF shapes, and related uncertainties." Applied Optics 60, no. 18 (June 16, 2021): 5405. http://dx.doi.org/10.1364/ao.425676.

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31

Roitberg, E., I. Malgeac, S. Weil-Zattelman, and F. Kizel. "BRDF LABORATORY MEASUREMENTS USING A CAMERA-AIDED SPECTRORADIOMETER." International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLIII-B3-2022 (May 30, 2022): 417–22. http://dx.doi.org/10.5194/isprs-archives-xliii-b3-2022-417-2022.

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Abstract. Numerous natural surfaces observed using Remote Sensing do not reflect light as Lambertian surfaces. Instead, their reflection is highly dependent on two main directions: the direction of the light source and the observation viewing angle, which characterize the Bidirectional Reflectance Distribution Function (BRDF). The BRDF is one of the challenging main effects of remote sensing. Thus, studying the BRDF of various land cover surfaces is essential, and researchers invest many efforts to fulfill this objective. However, measuring the BRDF is tricky and requires unique instruments, e.g., the Gonioreflectometer. Unfortunately, the availability of such instruments is deficient, and they are costly and hard to maintain. Considering these limitations, we present a study and a new approach for measuring the BRDF of surfaces with a camera-aided spectroradiometer that simultaneously acquires an RGB image from the sensor location beside the spectral measurement. Then, we feed the Structure From Motion (SFM) process with the RGM images to retrieve the sensor locations. Next, we convert the sensor locations into the quantities needed for the BRDF measurement, i.e., zenith angles and distances relative to the measured sample. Finally, we apply a set of measurements under controlled conditions in a dark room designed for hyperspectral remote sensing studies to evaluate the proposed methodology. In particular, we experimented with three different material surfaces. The results clearly show the highly accurate sensor position derived by SFM, providing zenith angles and distance from the scene’s center with mean errors around one degree and 2.5 centimeters, respectively. In addition, the obtained spectra tell that the proposed approach is suitable for multiangular measurements of reflected light and studying the BRDF.

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32

Raptis, Panagiotis-Ioannis, Stelios Kazadzis, Julian Gröbner, Natalia Kouremeti, Lionel Doppler, Ralf Becker, and Constantinos Helmis. "Water vapour retrieval using the Precision Solar Spectroradiometer." Atmospheric Measurement Techniques 11, no. 2 (February 27, 2018): 1143–57. http://dx.doi.org/10.5194/amt-11-1143-2018.

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Abstract. The Precision Solar Spectroradiometer (PSR) is a new spectroradiometer developed at Physikalisch-Meteorologisches Observatorium Davos – World Radiation Center (PMOD–WRC), Davos, measuring direct solar irradiance at the surface, in the 300–1020 nm spectral range and at high temporal resolution. The purpose of this work is to investigate the instrument's potential to retrieve integrated water vapour (IWV) using its spectral measurements. Two different approaches were developed in order to retrieve IWV: the first one uses single-channel and wavelength measurements, following a theoretical water vapour high absorption wavelength, and the second one uses direct sun irradiance integrated at a certain spectral region. IWV results have been validated using a 2-year data set, consisting of an AERONET sun-photometer Cimel CE318, a Global Positioning System (GPS), a microwave radiometer profiler (MWP) and radiosonde retrievals recorded at Meteorological Observatorium Lindenberg, Germany. For the monochromatic approach, better agreement with retrievals from other methods and instruments was achieved using the 946 nm channel, while for the spectral approach the 934–948 nm window was used. Compared to other instruments' retrievals, the monochromatic approach leads to mean relative differences up to 3.3 % with the coefficient of determination (R2) being in the region of 0.87–0.95, while for the spectral approach mean relative differences up to 0.7 % were recorded with R2 in the region of 0.96–0.98. Uncertainties related to IWV retrieval methods were investigated and found to be less than 0.28 cm for both methods. Absolute IWV deviations of differences between PSR and other instruments were determined the range of 0.08–0.30 cm and only in extreme cases would reach up to 15 %.

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LIU Li-ying, 刘丽莹, 李野 LI Ye, 郑峰 ZHENG Feng, 张国玉 ZHANG Guo-yu, 徐毅刚 XU Yi-gang, and 杨礼艳 YANG Li-yan. "Nonlinearity Characteristic Modeling and Correction of CCD Spectroradiometer." ACTA PHOTONICA SINICA 48, no. 8 (2019): 804002. http://dx.doi.org/10.3788/gzxb20194808.0804002.

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Scott, J. C., and G. L. Stephens. "A visible-infrared spectroradiometer for cloud reflectance measurements." Journal of Physics E: Scientific Instruments 18, no. 8 (August 1985): 697–701. http://dx.doi.org/10.1088/0022-3735/18/8/011.

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35

Sildoja, Meelis-Mait, Saulius Nevas, Natalia Kouremeti, Julian Gröbner, Sven Pape, Stefan Pendsa, Peter Sperfeld, and Fabian Kemus. "LED-based UV source for monitoring spectroradiometer properties." Metrologia 55, no. 3 (April 13, 2018): S97—S103. http://dx.doi.org/10.1088/1681-7575/aab639.

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36

Bodhaine, B. A., R. L. McKenzie, P. V. Johnston, D. J. Hofmann, E. G. Dutton, R. C. Schnell, J. E. Barnes, S. C. Ryan, and M. Kotkamp. "New Ultraviolet Spectroradiometer measurements at Mauna Loa Observatory." Geophysical Research Letters 23, no. 16 (August 1, 1996): 2121–24. http://dx.doi.org/10.1029/96gl01954.

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Yakunin, M. A., and A. V. Yurchenko. "MODTRAN5 simulations of responses from MODIS spectroradiometer channels." Technical Physics 60, no. 1 (January 2015): 141–44. http://dx.doi.org/10.1134/s1063784215010272.

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38

Meister, Gerhard, Ewa J. Kwiatkowska, Bryan A. Franz, Frederick S. Patt, Gene C. Feldman, and Charles R. McClain. "Moderate-Resolution Imaging Spectroradiometer ocean color polarization correction." Applied Optics 44, no. 26 (September 10, 2005): 5524. http://dx.doi.org/10.1364/ao.44.005524.

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39

Turyshev, L. N., Yu I. Atrashevskii, V. N. Denisenko, and V. L. Tavgin. "Spectroradiometer for Monitoring Near-Earth Ultraviolet Solar Radiation." Journal of Applied Spectroscopy 72, no. 2 (March 2005): 280–87. http://dx.doi.org/10.1007/s10812-005-0069-6.

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40

Niedzwiedz, Angelika, Jens Duffert, Mario Tobar-Foster, Jan Wilko Heinzel, and Gunther Seckmeyer. "Field calibration for multidirectional spectroradiometers." Measurement Science and Technology 33, no. 6 (March 11, 2022): 065904. http://dx.doi.org/10.1088/1361-6501/ac56be.

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Abstract A mobile calibration system for a multidirectional spectroradiometer (MUDIS) to transfer the absolute radiometric calibration from the laboratory to the location of the outdoor-measurement (field calibrator) has been developed. The main part of the calibration system comprises an aluminium sphere with a diameter of 40 cm, mounting adapters and a ventilation system. The MUDIS device is capable of measuring spectral radiance from 320 to 600 nm in 113 different directions simultaneously within 1 s. When repeating radiance measurements inside the mobile field sphere, the relative standard deviation (RSD) for wavelengths between 320 and 600 nm is less than 1.8% (320 nm) for all directions with minimum RSD of 0.6% at 382 nm. The reproducibility depends not only on the wavelength but also on the individual fibre position on the hemispherical input optics, with maximum of 4.5% RSD, but most directions show a lower deviation. On average, the RSD for the channels is less than 0.9%. The calibrator enables measurements of the spectral radiance with less uncertainty than with the previous indirect calibration method, which uses measurements of a scanning reference array spectroradiometer.

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41

Aldhebiani, Amal Y., Mohamed Elhag, and Amjaad A. Alshehri. "Consideration of hyperspectral data in intraspecific variation (spectrotaxonomy) in Prosopis juliflora (Sw.) DC, Saudi Arabia." Open Geosciences 13, no. 1 (January 1, 2021): 280–92. http://dx.doi.org/10.1515/geo-2020-0231.

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Abstract Classification is the science that arranges organisms in groups according to their similarities and differences. In plant science, there are many aspects of classifications. For instance, there is morphological, anatomical, palynological, molecular, and chemical classification. All these types consume time, effort, and money. In this research, new technology is tested to identify the differences between plants. Spectroradiometer will help in classifying Prosopis juliflora (Sw.) DC in Bahrah region in Saudi Arabia. Spectroradiometer technology is applied to a sample of 40 taxa of P. juliflora in two different seasons. Within each sample site, measurements were taken at a high sun angle from 10:00 am to 2:00 pm. Results showed that spectroradiometer indicated the existence of significant differences among P. juliflora taxa. Correspondingly, the spectroradiometer engenders the spectral responses of the targeted species in the region between 400 and 2,500 nm wavelength. The spectral behavior of P. juliflora in four seasons was demonstrated as season dependent. The variance-based principal component analysis divided the investigated samples into two groups, either positively correlated or negatively correlated according to the seasonal data collection. Sample number 5 in the quantile’s slicing analysis maintained a stable behavior when it was exposed to 100% wavelength. P. juliflora behavior was stabilized in the infrared (IR) samples (4,5), the shortwave IR (SWIR) (3,4,5), and thermal IT (TIR) (3,4,5,6) at the quantile range of >75. While in the quantile range <25, we found the stability behavior in the IR samples (2,8,10), the SWIR (2,7,8,10), and in TIR (2,7,8,10). Therefore, this approved that the spectroradiometer is useful as the first classification process. More studies are needed to support this finding, such as chemical and molecular investigations.

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Bagheri, Sima. "Utility of Field Spectroradiometer Data in Chlorophyll-α Estimation." Open Remote Sensing Journal 5, no. 1 (August 28, 2012): 90–95. http://dx.doi.org/10.2174/1875413901205010090.

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43

YANG Li-yan, 杨礼艳, 张国玉 ZHANG Guo-yu, 郑茹 ZHENG Ru, 卞臻臻 BIAN Zhen-zhen, 郑峰 ZHENG Feng, and 胡冰 HU Bing. "Design of Spectroradiometer Incidence System Based on Lightcone Coupling." ACTA PHOTONICA SINICA 44, no. 12 (2015): 1206005. http://dx.doi.org/10.3788/gzxb20154412.1206005.

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44

Sadovnikov, R. N., I. V. Kudymova, and A. S. Samorodov. "Monitoring Reliability of Spectroradiometer Readings in Dusty Atmospheric Conditions." Herald of the Bauman Moscow State Technical University. Series Natural Sciences, no. 84 (June 2019): 34–45. http://dx.doi.org/10.18698/1812-3368-2019-3-34-45.

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The paper considers the possibility of monitoring reliability of infrared spectroradiometer operation when detecting the presence of a toxic chemical in a dusty atmosphere. We present a method for estimating cumulative concentration of aerosol particles based on evaluating variations in contrast of a test object against the background in the visible wavelength range during gas and aerosol cloud propagation. In order to determine the critical contrast value that corresponds to the aerosol concentration designating further inability of the spectroradiometer to detect the toxic chemical in the air, we propose to numerically solve the problem of radiation transfer in a medium with known parameters. We report the results of solving this problem for an interfering aerosol consisting of water droplets with a diameter of 5--20 µm. We show that for a signal-to-noise ratio of 100 it is possible to detect a toxic chemical at aerosol concentrations of up to 5 g/m2. Implementing the method proposed involves using a video camera to monitor the test object and a computer to process the images recorded.

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Pawar*, Bharati S., and Ratnadeep R. Deshmukh. "Predicting Lead and Nickel Contamination in Soil using Spectroradiometer." International Journal of Recent Technology and Engineering 10, no. 1 (May 30, 2021): 121–25. http://dx.doi.org/10.35940/ijrte.a5758.0510121.

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In the geosciences, visible–near–short-wave infrared reflectance spectroscopy seems to have the capability to become a helpful technique for soil classification, mapping, and remote confirmation of soil characteristics and mineral composition. Focus on improving the spatial resolution of soil maps in order to better deal with localized problems like soil pollution. A variety of physio-chemical properties were measured in long-term spiked soils with a range of lead and nickel concentrations and also their spectral reflectance between 400 and 2500 nm at three different locations in the agricultural region of MIDC, Aurangabad, Maharashtra, India. Principle component analysis (PCA) used for feature extraction of soil were partial least squares regression (PLSR) method is used for classification. To measured amount of lead and nickel in soil sample, thirteen features of soil samples are calculated. The main aim of this study was to use statistical methods to calculate the lead and nickel concentrations in soil, as well as to assess the efficiency of VNIR-SWIR reflectance spectroscopy for heavy metal estimation in soil using the ASD FieldSpec4 Spectroradiometer. R2 = 0.96 provides the best precision for lead content and R2 = 0.95 for nickel content in soil, according to the findings. Lead and nickel have RMSEs of 3.396 and 2.680, respectively. The outcomes show that the proposed method is capable of accurately forecasting lead and nickel concentrations.

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Kouremeti, Natalia, Julian Gröbner, and Saulius Nevas. "Stray-Light Correction Methodology for the Precision Solar Spectroradiometer." Journal of Physics: Conference Series 2149, no. 1 (January 1, 2022): 012002. http://dx.doi.org/10.1088/1742-6596/2149/1/012002.

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Abstract A stray-light correction methodology for the Precision Solar Spectroradiometer (PSR) is presented. The correction is based on laboratory-measured line spread functions also taking into account the radiation from the 2nd and 3rd grating orders. The efficiency of the correction is validated on solar and lamp measurement data. The results are compared to those obtained with a PSR equipped with an order-sorting filter and with a Precision Filter Radiometer.

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Liu Jiaqing, 刘加庆, 韩顺利 Han Shunli, 孟鑫 Meng Xin, and 胡德信 Hu Dexin. "Radiometric Calibration Method of 2-14 μm Infrared Spectroradiometer." Acta Optica Sinica 39, no. 2 (2019): 0212003. http://dx.doi.org/10.3788/aos201939.0212003.

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RAUT, S. S., and B. K. GAVIT. "Development of soil line and vegetative indices using spectroradiometer." INTERNATIONAL JOURNAL OF AGRICULTURAL ENGINEERING 8, no. 2 (October 15, 2015): 227–31. http://dx.doi.org/10.15740/has/ijae/8.2/227-231.

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Bonzagni, Maria, Umberto Amato, Rolando Rizzi, and Rodolfo Guzzi. "Evaluation of the shadowband effect on a 2π spectroradiometer." Applied Optics 28, no. 12 (June 15, 1989): 2199. http://dx.doi.org/10.1364/ao.28.002199.

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Zuber, Ralf, Mario Ribnitzky, Mario Tobar, Kezia Lange, Dimitrij Kutscher, Michael Schrempf, Angelika Niedzwiedz, and Gunther Seckmeyer. "Global spectral irradiance array spectroradiometer validation according to WMO." Measurement Science and Technology 29, no. 10 (September 10, 2018): 105801. http://dx.doi.org/10.1088/1361-6501/aada34.

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