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Artykuły w czasopismach na temat „Frequency drift interferometry”

Autor: Grafiati

Data publikacji: 28 września 2024

Data aktualizacji: 31 lipca 2025

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1

Wu, Wan Duo, Qiang Xian Huang, Chao Qun Wang, Ting Ting Wu, and Hong Xie. "The Analysis and Design of a Large Stroke with High-Precision Polarized Laser Interferometer System." Key Engineering Materials 679 (February 2016): 129–34. http://dx.doi.org/10.4028/www.scientific.net/kem.679.129.

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The technique utilizing single-frequency laser interferometry has very high measurement accuracy, but it has rigorous requirements for optical design which is affected by many factors. In order to achieve single-frequency laser interferometry with large stroke and high precision, the integral layout, the polarization phase shifting technique and the common mode rejection method are adopted to design the length interferometry system. This paper analyzes factors and design requirements which affect measurement accuracy with large stroke. Based on polarization phase shifting technique, the system

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2

Liu, Tiegen, Junfeng Shi, Junfeng Jiang, et al. "Nonperpendicular Incidence Induced Spatial Frequency Drift in Polarized Low-Coherence Interferometry and Its Compensation." IEEE Photonics Journal 7, no. 6 (2015): 1–7. http://dx.doi.org/10.1109/jphot.2015.2494505.

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Qian, Yibin, Jiakun Li, Qibo Feng, Qixin He, and Fei Long. "Error Analysis of Heterodyne Interferometry Based on One Single-Mode Polarization-Maintaining Fiber." Sensors 23, no. 8 (2023): 4108. http://dx.doi.org/10.3390/s23084108.

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Using polarization-maintaining fiber (PMF) in dual-frequency heterodyne interferometry has the advantages of reducing the laser’s own drift, obtaining high-quality light spots, and improving thermal stability. Using only one single-mode PMF to achieve the transmission of dual-frequency orthogonal, linearly polarized beam requires angular alignment only once to realize the transmission of dual-frequency orthogonal, linearly polarized light, avoiding coupling inconsistency errors, so that it has the advantages of high efficiency and low cost. However, there are still many nonlinear influencing f

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4

Kakuma, Seiichi, and Yasuhiko Katase. "Frequency scanning interferometry immune to length drift using a pair of vertical-cavity surface-emitting laser diodes." Optical Review 19, no. 6 (2012): 376–80. http://dx.doi.org/10.1007/s10043-012-0061-3.

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5

Zhang, Jinge, Hamish A. S. Reid, Eoin Carley, et al. "Imaging a Large Coronal Loop Using Type U Solar Radio Burst Interferometry." Astrophysical Journal 965, no. 2 (2024): 107. http://dx.doi.org/10.3847/1538-4357/ad26fd.

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Abstract Solar radio U-bursts are generated by electron beams traveling along closed magnetic loops in the solar corona. Low-frequency (<100 MHz) U-bursts serve as powerful diagnostic tools for studying large-sized coronal loops that extend into the middle corona. However, the positive frequency drift component (descending leg) of U-bursts has received less attention in previous studies, as the descending radio flux is weak. In this study, we utilized LOFAR interferometric solar imaging data from a U-burst that has a significant descending leg component, observed between 10 and 90 MHz on 20

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6

Monselesan, D. P., R. J. Morris, P. L. Dyson, and M. R. Hyde. "Southern high-latitude Digisonde observations of ionosphere E-region Bragg scatter during intense lacuna conditions." Annales Geophysicae 22, no. 8 (2004): 2819–35. http://dx.doi.org/10.5194/angeo-22-2819-2004.

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Abstract. During summer months at solar cycle minimum, F-region lacuna and slant-Es conditions (SEC) are common features of daytime ionograms recorded around local magnetic noon at Casey, Antarctica. Digisonde measurements of drift velocity height profiles show that the occurrence of lacuna prevents the determination of F-region drift velocities and also affects E-region drift velocity measurements. Unique E-region spectral features revealed as intervals of Bragg scatter superimposed on typical background E-region reflection were observed in Digisonde Doppler spectra during intense lacuna cond

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7

Denbina, Michael, Marc Simard, Ernesto Rodriguez, Xiaoqing Wu, Albert Chen, and Tamlin Pavelsky. "Mapping Water Surface Elevation and Slope in the Mississippi River Delta Using the AirSWOT Ka-Band Interferometric Synthetic Aperture Radar." Remote Sensing 11, no. 23 (2019): 2739. http://dx.doi.org/10.3390/rs11232739.

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AirSWOT is an airborne Ka-band synthetic aperture radar, capable of mapping water surface elevation (WSE) and water surface slope (WSS) using single-pass interferometry. AirSWOT was designed as a calibration and validation instrument for the forthcoming Surface Water and Ocean Topography (SWOT) mission, an international spaceborne synthetic aperture radar mission planned for launch in 2022 which will enable global mapping of WSE and WSS. As an airborne instrument, capable of quickly repeating overflights, AirSWOT enables measurement of high frequency and fine scale hydrological processes encou

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8

Liu, Sixun, Zhuo Wang, and Yueyang Zhai. "In-Situ Detection for Atomic Density in the K-Rb-21Ne Co-Magnetometer via an Optical Heterodyne Interferometry." Photonics 10, no. 10 (2023): 1091. http://dx.doi.org/10.3390/photonics10101091.

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The low-frequency fluctuations of the atomic density within the cell can induce the longterm drift of the K-Rb-21Ne spin-exchange relaxation-free (SERF) co-magnetometer output, such that the accurate measurement of in situ atomic density is of great significance for improving the performance of co-magnetometer. In this paper, the complex refractive index model of the spin ensembles under the hybrid optical pumping condition is established first, according to which the relation between atomic density and its complex refractive index is revealed and an optical heterodyne-based scheme for atomic

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9

Saito, S., M. Yamamoto, S. Fukao, M. Marumoto, and R. T. Tsunoda. "Radar observations of field-aligned plasma irregularities in the SEEK-2 campaign." Annales Geophysicae 23, no. 7 (2005): 2307–18. http://dx.doi.org/10.5194/angeo-23-2307-2005.

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Abstract. During the Sporadic E Experiment over Kyushu 2 (SEEK-2) campaign, field-aligned irregularities (FAIs) associated with midlatitude sporadic-E (Es) layers were observed with two backscatter radars, the Lower Thermosphere Profiler Radar (LTPR) and the Frequency Agile Radar (FAR), which were located 40 km apart in Tanegashima, Japan. We conducted observations of FAI echoes from 31 July to 24 August 2002, and the radar data were used to determine launch timing of two sounding rockets on 3 August 2002. Our comparison of echoes obtained by the LTPR and the FAR revealed that echoes often app

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10

Ma, Maoli, Guifré Molera Calvés, Giuseppe Cimò, et al. "Detecting the Oscillation and Propagation of the Nascent Dynamic Solar Wind Structure at 2.6 Solar Radii Using Very Long Baseline Interferometry Radio Telescopes." Astrophysical Journal Letters 940, no. 2 (2022): L32. http://dx.doi.org/10.3847/2041-8213/ac96e7.

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Abstract Probing the solar corona is crucial to study the coronal heating and solar wind acceleration. However, the transient and inhomogeneous solar wind flows carry large-amplitude inherent Alfvén waves and turbulence, which make detection more difficult. We report the oscillation and propagation of the solar wind at 2.6 solar radii (Rs) by observation of China’s Tianwen and ESA’s Mars Express with radio telescopes. The observations were carried out on 2021 October 9, when one coronal mass ejection (CME) passed across the ray paths of the telescope beams. We obtain the frequency fluctuations

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11

Amiri, Mandana, Kevin Bandura, Anja Boskovic, et al. "An Overview of CHIME, the Canadian Hydrogen Intensity Mapping Experiment." Astrophysical Journal Supplement Series 261, no. 2 (2022): 29. http://dx.doi.org/10.3847/1538-4365/ac6fd9.

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Abstract The Canadian Hydrogen Intensity Mapping Experiment (CHIME) is a drift scan radio telescope operating across the 400–800 MHz band. CHIME is located at the Dominion Radio Astrophysical Observatory near Penticton, BC, Canada. The instrument is designed to map neutral hydrogen over the redshift range 0.8–2.5 to constrain the expansion history of the universe. This goal drives the design features of the instrument. CHIME consists of four parallel cylindrical reflectors, oriented north–south, each 100 m × 20 m and outfitted with a 256-element dual-polarization linear feed array. CHIME obser

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12

Coradini, Murilo Franco, Luiz Henrique Vitti Felão, Stephany de Souza Lyra, Marcelo Carvalho Minhoto Teixeira, and Claudio Kitano. "Takagi–Sugeno Fuzzy Nonlinear Control System for Optical Interferometry." Sensors 25, no. 6 (2025): 1853. https://doi.org/10.3390/s25061853.

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The Takagi-Sugeno (T-S) fuzzy control is a nonlinear method that uses a combination of linear controllers as its control law. This method has been applied in various fields of scientific research: buck converters, biomedicine, civil engineering, etc. To the best of the authors’ knowledge, although works on traditional fuzzy control and optical interferometry have already been published, this is the first time that T-S fuzzy (specifically) is applied to demodulate interferometry signals. Through a proof-of-concept experiment, the paper describes the fusion of an open-loop interferometer with an

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13

Eastwood, Michael W., and Gregg Hallinan. "Full-Sky Maps of the VHF Radio Sky with the Owens Valley Radio Observatory Long Wavelength Array." Proceedings of the International Astronomical Union 12, S333 (2017): 110–13. http://dx.doi.org/10.1017/s1743921317011231.

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Abstract21-cm cosmology is a powerful new probe of the intergalactic medium at redshifts 20 ≳ z ≳ 6 corresponding to the Cosmic Dawn and Epoch of Reionization. Current observations of the highly-redshifted 21-cm transition are limited by the dynamic range they can achieve against foreground sources of low-frequency (<200 MHz) of radio emission. We used the Owens Valley Radio Observatory Long Wavelength Array (OVRO-LWA) to generate a series of new modern high-fidelity sky maps that capture emission on angular scales ranging from tens of degrees to ∼15 arcmin, and frequencies between 36 and 7

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14

Witschas, Benjamin, Christian Lemmerz, Oliver Lux, et al. "Spectral performance analysis of the Aeolus Fabry–Pérot and Fizeau interferometers during the first years of operation." Atmospheric Measurement Techniques 15, no. 5 (2022): 1465–89. http://dx.doi.org/10.5194/amt-15-1465-2022.

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Abstract. In August 2018, the European Space Agency (ESA) launched the first Doppler wind lidar into space, which has since then been providing continuous profiles of the horizontal line-of-sight wind component at a global scale. Aeolus data have been successfully assimilated into several numerical weather prediction (NWP) models and demonstrated a positive impact on the quality of the weather forecasts. To provide valuable input data for NWP models, a detailed characterization of the Aeolus instrumental performance as well as the realization and minimization of systematic error sources is cru

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15

Zhang, Ya-Fei, Yu-Tao Feng, Di Fu, et al. "Thermal imaging drift monitoring of Doppler asymmetric spatial heterodyne spectroscopy for wind measurement based on segmented edge fitting." Acta Physica Sinica 71, no. 8 (2022): 084201. http://dx.doi.org/10.7498/aps.71.20212086.

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Doppler asymmetric spatial heterodyne spectroscopy is recently developed for spaceborne measurement of middle and upper atmospheric wind field, which relies on the accurate inverse of interferogram phase to calculate the Doppler shift of airglow emission lines. The change of temperature leads the optical and mechanical components to thermally deformed, causing the imaging plane to thermally drift relative to the detector, changing the distribution of interferogram phase on pixels, and directly introducing phase errors to affect the wind speed inversion. In order to reduce the influence of imag

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16

Yang, Hongxing, Ziqi Yin, Ruitao Yang, Pengcheng Hu, Jing Li, and Jiubin Tan. "Design for a Highly Stable Laser Source Based on the Error Model of High-Speed High-Resolution Heterodyne Interferometers." Sensors 20, no. 4 (2020): 1083. http://dx.doi.org/10.3390/s20041083.

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Heterodyne interferometers with two opposite Doppler shift interference signals have been proposed for high-resolution measurement with high measurement speed, which can be used in the background of high-speed high-resolution measurement. However, a measurement error model for high-speed high-resolution heterodyne interferometers (HSHR-HIs) has not yet been proposed. We established a HSHR-HI measurement error model, analyzed the influence of beat frequency stability with a simplified optical structure, and then designed an offset-locked dual-frequency laser source with a digital control system

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17

Tao Long, 陶龙, 刘志刚 Liu Zhigang, 吕涛 Lü Tao, 邓忠文 Deng Zhongwen, and 龚海 Gong Hai. "Drift Error Compensation Method of Frequency Sweeping Interferometer by Consecutive Forward and Reverse Optical Frequency Scanning." Acta Optica Sinica 34, no. 2 (2014): 0212002. http://dx.doi.org/10.3788/aos201434.0212002.

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18

Tao, Long, Zhigang Liu, Weibo Zhang, Zhe Liu, and Jun Hong. "Real-time drift error compensation in a self-reference frequency-scanning fiber interferometer." Optics Communications 382 (January 2017): 99–104. http://dx.doi.org/10.1016/j.optcom.2016.07.036.

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19

Zhang, Shiwen, Liyan Li, Yuliang Liu, and Yan Zhou. "Drift Error Compensation Algorithm for Heterodyne Optical Seawater Refractive Index Monitoring of Unstable Signals." Sensors 23, no. 20 (2023): 8460. http://dx.doi.org/10.3390/s23208460.

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The refractive index measurement of seawater has proven significance in oceanography, while an optical heterodyne interferometer is an important, highly accurate, tool used for seawater refractive index measurement. However, for practical seawater refractive index measurement, the refractive index of seawater needs to be monitored for long periods of time, and the influence of drift error on the measurement results for these cases cannot be ignored. This paper proposes a drift error compensation algorithm based on wavelet decomposition, which can adaptively separate the background from the sig

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20

Brotzer, Andreas, Felix Bernauer, Karl Ulrich Schreiber, Joachim Wassermann, and Heiner Igel. "Automated Quality Assessment of Interferometric Ring Laser Data." Sensors 21, no. 10 (2021): 3425. http://dx.doi.org/10.3390/s21103425.

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In seismology, an increased effort to observe all 12 degrees of freedom of seismic ground motion by complementing translational ground motion observations with measurements of strain and rotational motions could be witnessed in recent decades, aiming at an enhanced probing and understanding of Earth and other planetary bodies. The evolution of optical instrumentation, in particular large-scale ring laser installations, such as G-ring and ROMY (ROtational Motion in seismologY), and their geoscientific application have contributed significantly to the emergence of this scientific field. The curr

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21

Волков, П. В., Д. А. Семиков, О. С. Вязанкин, А. В. Горюнов, А. Ю. Лукьянов та А. Д. Тертышник. "Метод детектирования малых колебаний на основе гомодинной демодуляции с тандемным низкокогерентным интерферометром". Журнал технической физики 93, № 7 (2023): 959. http://dx.doi.org/10.21883/jtf.2023.07.55753.78-23.

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The paper proposes a method for detecting small oscillations in the length of interference fiber-optic sensors, which makes it possible to compensate for the problem of slow drift of the working point with a remote sensor. The result is achieved by combining homodyne demodulation methods with a tandem low-coherence interferometer. Theoretically and experimentally, the possibility of detecting acoustic effects in the operating frequency band of 4 kHz with a sensitivity of up to 0.3 nm has been shown.

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22

Wang, Jingying, Mario G. Santos, Philip Bull, et al. "H i intensity mapping with MeerKAT: calibration pipeline for multidish autocorrelation observations." Monthly Notices of the Royal Astronomical Society 505, no. 3 (2021): 3698–721. http://dx.doi.org/10.1093/mnras/stab1365.

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ABSTRACT While most purpose-built 21-cm intensity mapping experiments are close-packed interferometer arrays, general-purpose dish arrays should also be capable of measuring the cosmological 21-cm signal. This can be achieved most efficiently if the array is used as a collection of scanning autocorrelation dishes rather than as an interferometer. As a first step towards demonstrating the feasibility of this observing strategy, we show that we are able to successfully calibrate dual-polarization autocorrelation data from 64 MeerKAT dishes in the L band (856–1712 MHz, 4096 channels), with 10.5 h

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23

Zhao, Yang, Shaokai Wang, Wei Zhuang, and Tianchu Li. "Raman-Laser System for Absolute Gravimeter Based On 87Rb Atom Interferometer." Photonics 7, no. 2 (2020): 32. http://dx.doi.org/10.3390/photonics7020032.

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The paper describes a Raman-laser system with high performance for an absolute gravimeter that was based on 87Rb atom interferometer. As our gravimeter is a part of the standard acceleration of gravity of China, the Raman lasers’ characteristics should be considered. This laser system includes two diode lasers. The master laser is frequency locked through the frequency-modulation (FM) spectroscopy technology. Its maximum frequency drift is better than 50 kHz in 11 h, which is measured by home-made optical frequency comb. The slave laser is phase locked to the master laser with a frequency diff

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24

Malykin, G. B. "Effect of higher harmonics of phase-modulation frequency on zero drift in a fiber ring interferometer." Radiophysics and Quantum Electronics 39, no. 5 (1996): 416–19. http://dx.doi.org/10.1007/bf02124699.

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Melnik, V. N., A. A. Konovalenko, V. V. Dorovskyy, A. Lecacheux, H. O. Rucker, and M. V. Shevchuk. "EXPLORATION OF THE SOLAR DECAMETER RADIO EMISSION WITH THE UTR-2 RADIO TELESCOPE." Radio physics and radio astronomy 26, no. 1 (2021): 74–89. http://dx.doi.org/10.15407/rpra26.01.074.

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Purpose: The overview of the scientifi c papers devoted to the study of the solar decameter radio emission with the world’s largest UTR-2 radio telescope (Ukraine) published for the last 50 years. Design/methodology/approach: The study and analysis of the scientifi c papers on both sporadic and quiet (thermal) radiation of the Sun recorded with the UTR-2 radio telescope at the decameter wavelength range. Findings: The most signifi cant observational and theoretical results of the solar radio emission studies obtained at the Institute of Radio Astronomy of the National Academy of Sciences of Uk

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26

Yuan, Quan, Feng Wang, Tao Liu, Yixin Zhang та Xuping Zhang. "Using an Auxiliary Mach–Zehnder Interferometer to Compensate for the Influence of Laser-Frequency-Drift in Φ-OTDR". IEEE Photonics Journal 11, № 1 (2019): 1–9. http://dx.doi.org/10.1109/jphot.2018.2884659.

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Zhao, Na, Qijing Lin, Zhuangde Jiang, et al. "High Temperature High Sensitivity Multipoint Sensing System Based on Three Cascade Mach–Zehnder Interferometers." Sensors 18, no. 8 (2018): 2688. http://dx.doi.org/10.3390/s18082688.

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A temperature multipoint sensing system based on three cascade Mach–Zehnder interferometers (MZIs) is introduced. The MZIs with different lengths are fabricated based on waist-enlarged fiber bitapers. The fast Fourier transformation is applied to the overlapping transmission spectrum and the corresponding interference spectra can be obtained via the cascaded frequency spectrum based on the inverse Fourier transformation. By analyzing the drift of interference spectra, the temperature response sensitivities of 0.063 nm/°C, 0.071 nm/°C, and 0.059 nm/°C in different furnaces can be detected from

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28

Volkov, Petr, Andrey Lukyanov, Alexander Goryunov, Daniil Semikov, Evgeniy Vopilkin, and Stanislav Kraev. "Fiber Optic Impact Location System Based on a Tracking Tandem Low-Coherence Interferometer." Sensors 23, no. 2 (2023): 772. http://dx.doi.org/10.3390/s23020772.

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This study proposes a method for detecting small-length fluctuations for fiber-optic sensors (FOS). The method is based on a tracking tandem low-coherence interferometer and enables the ability to compensate for temperature and deformation drifts in FOS. As a result, the constant high sensitivity of FOS over a wide frequency range is guaranteed. Sensitivity to the level of 2 nm in the frequency range of 200 kHz has been demonstrated. The operation of the circuit is demonstrated on the example of the 2D location of acoustic signals using a correlation algorithm for signal processing, known as t

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Mahudapathi, Sumathi, Sumukh Nandan R, Gowrishankar R, and Balaji Srinivasan. "The Challenges and Opportunities for Performance Enhancement in Resonant Fiber Optic Gyroscopes." Sensors 25, no. 1 (2025): 223. https://doi.org/10.3390/s25010223.

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In the last decade, substantial progress has been made to improve the performance of optical gyroscopes for inertial navigation applications in terms of critical parameters such as bias stability, scale factor stability, and angular random walk (ARW). Specifically, resonant fiber optic gyroscopes (RFOGs) have emerged as a viable alternative to widely popular interferometric fiber optic gyroscopes (IFOGs). In a conventional RFOG, a single-wavelength laser source is used to generate counter-propagating waves in a ring resonator, for which the phase difference is measured in terms of the resonant

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30

Bourgoin, A., C. Le Poncin-Lafitte, S. Mathis, and M. C. Angonin. "Magnetic fields in galactic binaries and gravitational waves." Proceedings of the International Astronomical Union 16, S363 (2020): 361–62. http://dx.doi.org/10.1017/s1743921322000813.

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AbstractThe Laser Interferometer Space Antenna (LISA) mission will observe from space gravitational waves emitted by neutron stars and white dwarfs within galactic binaries. These compact stars can have intense magnetic fields. Therefore, the impact of the magnetic fields on the orbital and the spins evolution of binary systems can potentially be detected by LISA through the GW’s strain. Within the magnetic dipole-dipole approximation, we found that magnetism generates a secular drift of the mean longitude which, in turn, shifts all the frequencies contained in the GW signal. For a quasi-circu

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Weemstra, Cornelis, Janneke I. de Laat, Arie Verdel, and Pieter Smets. "Systematic recovery of instrumental timing and phase errors using interferometric surface-waves retrieved from large-N seismic arrays." Geophysical Journal International 224, no. 2 (2020): 1028–55. http://dx.doi.org/10.1093/gji/ggaa504.

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SUMMARY Instrumental timing and phase errors are a notorious problem in seismic data acquisition and processing. These can be frequency independent, for example due to clock drift, but may also be frequency dependent, for example due to imperfectly known instrument responses. A technique is presented that allows both types of errors to be recovered in a systematic fashion. The methodology relies on the time-symmetry usually inherent in time-averaged cross-correlations of ambient seismic noise: the difference between the arrival time of the direct surface-wave at positive time and the arrival t

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32

Sovers, O. J., C. D. Edwards, C. S. Jacobs, G. E. Lanyi, and R. N. Treuhaft. "The JPL 1986–3 Extragalactic Reference Frame." Symposium - International Astronomical Union 133 (1988): 461–64. http://dx.doi.org/10.1017/s0074180900140021.

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Intercontinental dual-frequency radio interferometric measurements were carried out during 1978 to 1985 between NASA's Deep Space Network stations in California, Spain, and Australia. Analysis of 6800 pairs of delay and delay rate observations made during 51 sessions produced a catalog of positions of 106 extragalactic radio sources, fairly uniformly distributed over the celestial sphere between −45° and +85° declination. Almost all of the resulting source positions have formal uncertainties between 0.5 and 3 milliarcseconds, with their distributions peaking somewhat below 1 mas. Root-mean-squ

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33

Shang Xin, Li Fan, Ma Zheng-Lei, et al. "Low noise photodetector in 0.1 mHz-1 Hz band." Acta Physica Sinica 74, no. 5 (2025): 0. https://doi.org/10.7498/aps.74.20241635.

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Laser intensity noise suppression in the millihertz frequency band is essential for space-based gravitational wave detection to ensure the sensitivity of the interferometer. Photonic feedback technology is one of the most effective methods for suppressing laser intensity noise. As the first-stage component in the feedback loop, the noise of the photodetector directly couples into the feedback loop, significantly impacting the laser intensity noise. Starting from the requirement to suppress laser intensity noise in the 0.1 mHz-1 Hz frequency band for space-based gravitational wave detection, th

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Ansari, R., J. E. Campagne, D. Charlet, et al. "Design, operation and performance of the PAON4 prototype transit interferometer." Monthly Notices of the Royal Astronomical Society 493, no. 2 (2020): 2965–80. http://dx.doi.org/10.1093/mnras/staa345.

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ABSTRACT PAON4 is an L-band (1250–1500 MHz) small interferometer operating in transit mode deployed at the Nançay observatory in France, designed as a prototype instrument for intensity mapping. It features four 5 m diameter dishes in a compact triangular configuration, with a total geometric collecting area of ${\sim} 75\, \mathrm{m^2}$, and is equipped with dual polarization receivers. A total of 36 visibilities are computed from the eight independent RF signals by the software correlator over the full 250 MHz RF band. The array operates in transit mode, with the dishes pointed toward a fixe

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Sesana, Alberto, Astrid Lamberts, and Antoine Petiteau. "Finding binary black holes in the Milky Way with LISA." Monthly Notices of the Royal Astronomical Society: Letters 494, no. 1 (2020): L75—L80. http://dx.doi.org/10.1093/mnrasl/slaa039.

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ABSTRACT We determine the main properties of the Galactic binary black hole (BBH) population detectable by Laser Interferometer Space Antenna (LISA) and strategies to distinguish them from the much more numerous white dwarf binaries. We simulate BBH populations based on cosmological simulations of Milky Way-like galaxies and binary evolution models. We then determine their gravitational wave emission as observed by LISA and build mock catalogues. According to our model, LISA will detect ≈4 (6) BBHs assuming 4 (10) yr of operations. Those figures grow to ≈6 (9) when models are re-normalized to

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Hussey, G. C., C. Haldoupis, A. Bourdillon, J. Delloue, and J. T. Wiensz. "Mid-latitude <i>E</i>-region bulk motions inferred from digital ionosonde and HF radar measurements." Annales Geophysicae 22, no. 11 (2004): 3789–98. http://dx.doi.org/10.5194/angeo-22-3789-2004.

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Abstract. In the mid-latitude E-region there is now evidence suggesting that neutral winds play a significant role in driving the local plasma instabilities and electrodynamics inside sporadicE layers. Neutral winds can be inferred from coherent radar backscatter measurements of the range-/azimuth-time-intensity (RTI/ATI) striations of quasi-periodic (QP) echoes, or from radar interferometer/imaging observations. In addition, neutral winds in the E-region can be estimated from angle-of-arrival ionosonde measurements of sporadic-E layers. In the present paper we analyse concurrent ionosonde and

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de Gasperin, F., T. J. Dijkema, A. Drabent, et al. "Systematic effects in LOFAR data: A unified calibration strategy." Astronomy & Astrophysics 622 (February 2019): A5. http://dx.doi.org/10.1051/0004-6361/201833867.

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Context. New generation low-frequency telescopes are exploring a new parameter space in terms of depth and resolution. The data taken with these interferometers, for example with the LOw Frequency ARray (LOFAR), are often calibrated in a low signal-to-noise ratio regime and the removal of critical systematic effects is challenging. The process requires an understanding of their origin and properties. Aim. In this paper we describe the major systematic effects inherent to next generation low-frequency telescopes, such as LOFAR. With this knowledge, we introduce a data processing pipeline that i

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Haider Ali Muse, Al-Sudani. "Principles of constructing gyroscopes based on photonic crystal (band-gap) fibers." Radiotekhnika, no. 205 (July 2, 2021): 100–107. http://dx.doi.org/10.30837/rt.2021.2.205.10.

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The gyroscope is a device that makes it possible to measure the change in the orientation angles associated rotation of the body relative to an inertial coordinate system. Photonic crystal fiber gyroscopes are a kind of optical gyroscopes that offer many new features beyond that conventional fiber optic gyroscopes can offer. In any case, the properties of the optical fiber can play a large role in determining the characteristics of the gyroscope. The principle of operation of most optical gyroscopes is based on the Sagnac effect or the Sagnac interferometer, the essence of which is as follows.

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Krasik, Tatiana. "Synchronization Methods for Multi-Detector Phased Systems." American Journal of Engineering and Technology 07, no. 07 (2025): 01–08. https://doi.org/10.37547/tajet/volume07issue07-01.

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This article examines synchronization methods for multi-detector phased systems that integrate spatially distributed transmit–receive nodes into a single coherent structure. The study's primary aim is to determine the technical requirements for temporal, frequency, and phase alignment of the elements, and to analyze the hardware and algorithmic means for achieving them. The relevance of this work is driven by the rapid development of phased arrays and distributed radar and astronomical systems, where even tens of picoseconds of desynchronization lead to significant loss of coherent gain and de

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Lemoine, Anne, Pierre Briole, Didier Bertil, et al. "The 2018–2019 seismo-volcanic crisis east of Mayotte, Comoros islands: seismicity and ground deformation markers of an exceptional submarine eruption." Geophysical Journal International 223, no. 1 (2020): 22–44. http://dx.doi.org/10.1093/gji/ggaa273.

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SUMMARY On 10 May 2018, an unprecedented long and intense seismic crisis started offshore, east of Mayotte, the easternmost of the Comoros volcanic islands. The population felt hundreds of events. Over the course of 1 yr, 32 earthquakes with magnitude greater than 5 occurred, including the largest event ever recorded in the Comoros (Mw = 5.9 on 15 May 2018). Earthquakes are clustered in space and time. Unusual intense long lasting monochromatic very long period events were also registered. From early July 2018, Global Navigation Satellite System (GNSS) stations and Interferometric Synthetic Ap

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Kiefer, Michael, Thomas von Clarmann, Bernd Funke, et al. "IMK/IAA MIPAS temperature retrieval version 8: nominal measurements." Atmospheric Measurement Techniques 14, no. 6 (2021): 4111–38. http://dx.doi.org/10.5194/amt-14-4111-2021.

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Abstract. A new global set of atmospheric temperature profiles is retrieved from recalibrated radiance spectra recorded with the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS). Changes with respect to previous data versions include a new radiometric calibration considering the time dependency of the detector nonlinearity and a more robust frequency calibration scheme. Temperature is retrieved using a smoothing constraint, while tangent altitude pointing information is constrained using optimal estimation. ECMWF ERA-Interim is used as a priori temperature below 43 km. Above,

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Zhang, Shihua, Hao Jin, Lingqi Zhang, and Liping Yan. "Absolute distance measurement using frequency sweeping interferometry with large swept range and target drift compensation." Measurement Science and Technology, May 10, 2023. http://dx.doi.org/10.1088/1361-6501/acd40e.

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Abstract Frequency sweeping interferometry (FSI) is an attractive absolute distance measurement (ADM) method because of the advantages of large unambiguity range, simple structure and excellent flexibility. By using reference interferometer, the calibration of the frequency sweeping range in FSI can be avoided, and the complexity and cost of the system can be further reduced. Then, the measurement accuracy is associated with the accuracy of phase demodulation, the width of frequency sweeping range and the compensation of target drift. In this paper, ADM using FSI with large swept range and tar

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Wei, Wei, Langfeng Zhou, Weilin Xie, and Yi Dong. "High-resolution measurement of laser frequency drift utilizing ultra-stable delayed self-heterodyne interferometry." Optics Letters, August 2, 2023. http://dx.doi.org/10.1364/ol.497956.

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Wang, Jiehao, Yuhang Li, Yiting Chen, Shuyang He, and Qiang Liu. "Modulation-free laser frequency stabilization via balanced detection of common-path Fano resonance in all-PM fiber cavity." APL Photonics 10, no. 7 (2025). https://doi.org/10.1063/5.0275633.

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Laser frequency stabilization is indispensable for extensive applications involving precision measurements, and the best performance has been achieved with the Pound–Drever–Hall technique. However, it relies on a bulky ultrastable Fabry–Pérot cavity with demanding environment disturbance isolation techniques, along with electro-optical modulation. Here, we present a modulation-free approach for laser frequency locking to an all-polarization-maintaining (PM) fiber cavity, and the error signal is obtained from balanced detection of common-path Fano resonance. The asymmetric Fano resonance arises

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Chen, Wenjia, Yiwen Ou, Chunfu Cheng, Yuanchang Zhu, Wen Xiao, and Hui Lv. "Optical sensor using space-domain active fiber cavity ringdown technique." Scientific Reports 12, no. 1 (2022). http://dx.doi.org/10.1038/s41598-022-17565-6.

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AbstractA novel active fiber cavity ringdown (FCRD) technique using frequency-shifted interferometry (FSI) is proposed for the first time. Using this scheme, external parameters can be monitored in the space domain by measuring the ringdown distance instead of ringdown time. A bidirectional erbium-doped fiber amplifier (Bi-EDFA) is employed to compensate the inherent cavity loss for achieving higher sensitivity. And two band-pass filters are used to reduce the amplified spontaneous emission (ASE) noise of the Bi-EDFA. Compared with the well-known time-domain active FCRD scheme, our proposed me

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Hull, Arthur J., Laurent Muschietti, Oleksiy V. Agapitov, Christopher C. Chaston, Olivier Le Contel, and Per‐Arne Lindqvist. "Energy Transport and Conversion Within Earth's Supercritical Bow Shock: The Role of Intense Lower‐Hybrid Whistler Waves." Journal of Geophysical Research: Space Physics 129, no. 5 (2024). http://dx.doi.org/10.1029/2023ja031630.

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AbstractDetailed analysis of a high Mach number quasiperpendicular Earth bow shock crossing by the Magnetospheric Multiscale (MMS) spacecraft fleet reveal that lower‐hybrid (LH) whistler waves generated in the shock foot region transport energy predominately along the shock surface and slightly toward the shock ramp in the shock normal incidence frame, where wave energy accumulates and is dissipated into the plasma. This suggests the LH whistlers play an integral role in energy reconfiguration at high Mach number collisionless shocks with ramifications to plasma heating. The multipoint observa

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Chen, Hong-Hui, Zhan-Wei Yao, Ze-Xi Lu, et al. "Self-calibrated atom-interferometer gyroscope by modulating atomic velocities." Review of Scientific Instruments 95, no. 5 (2024). http://dx.doi.org/10.1063/5.0198240.

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Atom-interferometer gyroscopes have attracted much attention for their long-term stability and extremely low drift. For such high-precision instruments, self-calibration to achieve an absolute rotation measurement is critical. In this work, we propose and demonstrate the self-calibration of an atom-interferometer gyroscope. This calibration is realized by using the detuning of the laser frequency to control the atomic velocity, thus modulating the scale factor of the gyroscope. The modulation determines the order and the initial phase of the interference stripe, thus eliminating the ambiguity

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Trott, Cathryn M. "Comparison of Observing Modes for Statistical Estimation of the 21 cm Signal from the Epoch of Reionisation." Publications of the Astronomical Society of Australia 31 (2014). http://dx.doi.org/10.1017/pasa.2014.23.

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AbstractNoise considerations for experiments that aim to statistically estimate the 21 cm signal from high redshift neutral hydrogen during the Epoch of Reionisation (EoR) using interferometric data are typically computed assuming a tracked observation, where the telescope pointing centre and instrument phase centre are the same over the observation. Current low frequency interferometers use aperture arrays of fixed dipoles, which are steered electronically on the sky, and have different properties to mechanically-steered single apertures, such as reduced sensitivity away from zenith, and disc

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LIANG Yue, XIE Yong-hui, SHUAI Tao, et al. "Simulation analysis of a hydrogen atomic clock double state-selection beam optical system." Acta Physica Sinica, 2023, 0. http://dx.doi.org/10.7498/aps.72.20221363.

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Hydrogen maser utilises transition frequency of hydrogen atom in hyperfine energy level of ground state for precise timing. It has excellent frequency stability, especially in medium and short-term, and low frequency drift. It has been used as high-precision frequency standard in engineering fields such as time keeping, navigation, and very long baseline interferometry. Clock transition of hydrogen maser is transition between states of |F=1, m<sub>F</sub>=0> and |F=0, m<sub>F</sub>=0>. State selection is realized by state selection magnet, through which high energ

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Zhao, Na, Qijing Lin, zhang fuzheng, et al. "High-precision and long-range optical fiber Fabry-Perot interferometer for high temperature measurement." Measurement Science and Technology, June 21, 2022. http://dx.doi.org/10.1088/1361-6501/ac7b10.

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Abstract In order to solve the problem of near-field measurement of aero-engine, a novel large-range, high-precision Fabry-Perot interferometer (FPI) is developed in this paper, which is verified by high temperature experiment. Based on the principle of FPI wavelength drift and frequency spectrum drift, a double-beam interference FPI is designed. Through the analysis of the optical path difference between the two beams, the conclusion that the spectrum drifts to the long-wave direction with the increase of temperature is obtained. Moreover, through frequency spectrum analysis, the measurement

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