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Journal articles on the topic 'Microwave attenuator'

Author: Grafiati

Published: 4 June 2021

Last updated: 21 February 2023

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1

Yuzvik, Denis A., and Maksim A. Stepanov. "An algorithm for synthesis of a film attenuator with uniform power dissipation along its length." Proceedings of the Russian higher school Academy of sciences, no. 2 (June 30, 2022): 60–69. http://dx.doi.org/10.17212/1727-2769-2022-2-60-69.

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The problem of synthesizing a film attenuator made by applying an absorbing material to a conductor is considered. Since the absorbing material has a parameter of maximum dissipated power per unit area, then when synthesizing an attenuator to attenuate high powers, the problem of exceeding the maximum dissipated power per unit area may arise. A sectional attenuator structure has been proposed, which is a set of sections having different attenuation to reduce the power dissipated per unit area. An algorithm for the synthesis of a sectional attenuator is proposed. The attenuator sections are rec

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2

Tatarenko, A. S., G. Srinivasan, and D. A. Filippov. "Magnetoelectric microwave attenuator." Electronics Letters 43, no. 12 (2007): 674. http://dx.doi.org/10.1049/el:20070949.

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3

Aubakirov, Constantine Y., and Alexander V. Makeev. "DESIGNING MICROWAVE BAND ATTENUATORS AS ELECTRIC FILTERS WITH LOSSES." Interexpo GEO-Siberia 8 (May 21, 2021): 280–87. http://dx.doi.org/10.33764/2618-981x-2021-8-280-287.

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This paper presents the results of modeling attenuators with an attenuation of 1,2 dB and 1,8 dB, based on a harmonic filter with resistive inserts. Resistive inserts were introduced into the low-resistance sections of the harmonic filter, and resistive loops were connected to the high-resistance sections of the filter. An implementation of a 10 dB attenuator based on a quasi-polynomial bandpass filter with losses is proposed. The working frequency band of such attenuators reaches 4 GHz.

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4

Cui, Hong Ling, Qi Su, and En Li. "Attenuation Distribution Broadband Measurement System of Ceramic Pole Attenuator Used for TWT." Key Engineering Materials 723 (December 2016): 224–29. http://dx.doi.org/10.4028/www.scientific.net/kem.723.224.

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Ceramic pole attenuator is an important part in TWT. The performance of TWT is closely related to the attenuation distribution of ceramic pole. The measurement of attenuation distribution was a difficult problem all the time. The traditional measurement method characterize the attenuation distribution by measuring the resistance distribution. The main disadvantage of this method is that result can not characterize ceramic pole’s performance in microwave condition. In this paper we select double-ridge waveguide as measurement transmission line, and based on the classical “Transmission and Refle

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5

Fabeni, P., D. Mugnai, G. P. Pazzi, and A. Ranfagni. "Microwave variable waveguide attenuator." Review of Scientific Instruments 79, no. 6 (2008): 066104. http://dx.doi.org/10.1063/1.2930798.

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6

Chadha, D., S. Aditya, M. R. Ambe, and G. Bamra. "Optically Controlled Microwave Attenuator." IETE Journal of Research 41, no. 2 (1995): 151–55. http://dx.doi.org/10.1080/03772063.1995.11437240.

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7

Mitkov, A. S., A. A. Stolyarenko, and M. G. Rubanovich. "FILM ATTENUATORS BASED ON FILTER STRUCTURES WITH DISSIPATIVE LOSSES." Issues of radio electronics, no. 4 (May 10, 2019): 84–89. http://dx.doi.org/10.21778/2218-5453-2019-4-84-89.

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The article presents the results of a study of the frequency properties of a multi-stage high-power attenuator with attenuation of 10 dB in the frequency range 0–3 GHz, obtained on a dielectric substrate made of beryllium ceramics. For its construction, microstrip filters with quarter-wave couplings and dissipative losses are used, as well as additional film resistors made in the form of trapezoidal plumes. These loops have a minimum size in the area of a short circuit. The design features of wide-band microwave attenuators of high power are determined, including the conditions for ensuring un

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8

Tang, Jie, Yi-Ran Liu, Li-Jiang Zhang, et al. "Flexible Thermo-Optic Variable Attenuator based on Long-Range Surface Plasmon-Polariton Waveguides." Micromachines 9, no. 8 (2018): 369. http://dx.doi.org/10.3390/mi9080369.

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A flexible thermo-optic variable attenuator based on long-range surface plasmon-polariton (LRSPP) waveguide for microwave photonic application was investigated. Low-loss polymer materials and high-quality silver strip were served as cladding layers and core layer of the LRSPP waveguide, respectively. By using finite element method (FEM), the thermal distribution and the optical field distribution have been carefully optimized. The fabricated device was characterized by end-fire excitation with a 1550 nm laser. The transmission performance of high-speed data and microwave modulated optical sign

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9

Koshelets, V. P., S. V. Shitov, A. V. Shchukin, et al. "Josephson tunnel junction microwave attenuator." Applied Physics Letters 63, no. 23 (1993): 3218–20. http://dx.doi.org/10.1063/1.110203.

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10

Li, Ze Lun, Zhi Cheng Huang, and You Jun Huang. "Study on a Moisture Measurement Method Based on Microwave Attenuation." Applied Mechanics and Materials 103 (September 2011): 305–8. http://dx.doi.org/10.4028/www.scientific.net/amm.103.305.

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A moisture measurement method based on microwave attenuation has been proposed. The principles of the method were analyzed theoretically and the structure of the moisture measurement instrument was designed. The microwave source, the isolator, the adjustable attenuator, the receiving antenna, the temperature sensor and the single chip microcomputer (SCM) system are all selected and designed. It can be concluded that the moisture measurement instrument with microwave attenuation method can be used in the online measurement system with high speed.

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11

Tatarenko, A. S., and M. I. Bichurin. "Microwave Magnetoelectric Devices." Advances in Condensed Matter Physics 2012 (2012): 1–10. http://dx.doi.org/10.1155/2012/286562.

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Tunable microwave magnetoelectric devices based on layered ferrite-ferroelectric structures are described. The theory and experiment for attenuator, band-pass filter and phase shifter are presented. Tunability of the ME devices characteristics can be executed by application of an electric field. This electric tuning is relatively fast and is not power-consuming. The attenuator insertion losses vary from 26 dB to 2 dB at frequency 7251 MHz. The tuning range of 25 MHz of band-pass filter at frequency 7360 MHz was obtained. A maximum phase shift of 30–40 degree at the frequency region 6–9 GHz was

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12

Antonenkov, O. V., and D. A. Filippov. "Electric-field-controlled magnetoelectric microwave attenuator." Technical Physics Letters 33, no. 9 (2007): 752–54. http://dx.doi.org/10.1134/s1063785007090118.

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13

Tomar, Raghbendra Singh, Enakshi K. Sharma, and A. K. Verma. "Optically Controlled Coupled Microstripline Microwave Power Attenuator." IOSR Journal of Electrical and Electronics Engineering 9, no. 5 (2014): 19–26. http://dx.doi.org/10.9790/1676-09541926.

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14

Xu, En Dao, Zhi Ping Chen, Zhen Jie Zhang, and Cun Jun He. "Design and Analysis of a Kind of Attenuator that Used in Microwave Moisture Contactor." Applied Mechanics and Materials 644-650 (September 2014): 3927–30. http://dx.doi.org/10.4028/www.scientific.net/amm.644-650.3927.

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According to design theory of attenuator, combining with the practical situation of microwave moisture contactor, this paper designs the structure of attenuator which center frequency is 10 GHz and the gain is greater than 10dB. Then making simulation and analysis with HFSS, and obtains a group of design parameters that meet the working requirements. Finally, verifying the feasibility of the attenuator by test.

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15

Li, Song, Tai Li Bai, and Yao Han. "Design of Automatic Level Control for Microwave Signal Source." Applied Mechanics and Materials 226-228 (November 2012): 2009–13. http://dx.doi.org/10.4028/www.scientific.net/amm.226-228.2009.

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The performance of the automatic level control（ALC） system determines the stability of the microwave signal source output power, accuracy and linear flatness in each frequency range, directly determining the signal generator power characteristic indicators. This paper gives an implementation of a high-performance feed-forward ALC circuit, the negative feedback loop consists of the power detector circuit, logarithmic amplifier, the integral hold circuit, attenuator driving circuit, PIN attenuation circuit and so on.

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16

Yoshida, Mitsuhiro, Hiroshi Matsumoto, Tsumoru Shintake, Koji Nishiyama, and Sadao Miura. "High-power microwave attenuator employing slow wave structure." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 693 (November 2012): 6–10. http://dx.doi.org/10.1016/j.nima.2012.06.001.

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17

Saavedra, C. E., and You Zheng. "Ring-hybrid microwave voltage-variable attenuator using HFET transistors." IEEE Transactions on Microwave Theory and Techniques 53, no. 7 (2005): 2430–34. http://dx.doi.org/10.1109/tmtt.2005.850400.

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18

Liu, Zheng, Lei Zhu, and Gaobiao Xiao. "A Novel Microwave Attenuator on Multilayered Substrate Integrated Waveguide." IEEE Transactions on Components, Packaging and Manufacturing Technology 6, no. 7 (2016): 1106–12. http://dx.doi.org/10.1109/tcpmt.2016.2572735.

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19

Saddow, S. E., B. J. Thedrez, and C. H. Lee. "An optoelectronic attenuator for the control of microwave circuits." IEEE Microwave and Guided Wave Letters 3, no. 10 (1993): 361–62. http://dx.doi.org/10.1109/75.242261.

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20

Riza, N. A., and S. E. Saddow. "Optically controlled photoconductive N-bit switched microwave signal attenuator." IEEE Microwave and Guided Wave Letters 5, no. 12 (1995): 448–50. http://dx.doi.org/10.1109/75.481857.

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21

Flemish, Joseph R., and Randy L. Haupt. "Optimization of a Photonically Controlled Microwave Switch and Attenuator." IEEE Transactions on Microwave Theory and Techniques 58, no. 10 (2010): 2582–88. http://dx.doi.org/10.1109/tmtt.2010.2065350.

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22

Pierantoni, Luca, Davide Mencarelli, Maurizio Bozzi, et al. "Broadband Microwave Attenuator Based on Few Layer Graphene Flakes." IEEE Transactions on Microwave Theory and Techniques 63, no. 8 (2015): 2491–97. http://dx.doi.org/10.1109/tmtt.2015.2441062.

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23

Wei, Zhihu, Rong Wang, Tao Pu, Guodan Sun, Tao Fang, and Jilin Zheng. "A tunable optoelectronic oscillator based on a tunable microwave attenuator." Optical Fiber Technology 19, no. 5 (2013): 383–86. http://dx.doi.org/10.1016/j.yofte.2013.05.004.

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24

Haidar, Jihad, Anne Vilcot, and Michel Bouthinon. "Optically tunable microwave attenuator using a quarter-wave microstrip coupler." Microwave and Optical Technology Letters 10, no. 6 (1995): 313–14. http://dx.doi.org/10.1002/mop.4650100602.

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25

Longhi, Patrick E., Sergio Colangeli, Walter Ciccognani, and Ernesto Limiti. "Improved microwave attenuator topology minimizing the number of control voltages." Microwave and Optical Technology Letters 61, no. 4 (2018): 926–29. http://dx.doi.org/10.1002/mop.31667.

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26

Liu, Lin, Yutang Ye, Yunfeng Wu, Zhenlong Chen, and Yulin Wang. "Study of optically controlled high temperature superconducting microwave variable attenuator." Microwave and Optical Technology Letters 49, no. 7 (2007): 1539–41. http://dx.doi.org/10.1002/mop.22494.

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27

Lei, Lin, and Zhi Xiong Ouyang. "Microwave Power Real-Time Soft-Measuring Based on Improved BP Neural Network." Advanced Materials Research 301-303 (July 2011): 902–7. http://dx.doi.org/10.4028/www.scientific.net/amr.301-303.902.

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There are many faults in microwave power measurement in the working spots. In this paper, the novel technique of microwave power measurement and Schottky detector and the technique of soft-measuring based on improved BP neural network are presented. Making use of directional coupler, the part of power of microwave signal in transmission line was taken in the certain proportion. Then, the microwave power meter indicated the magnitude of power. The microwave power measurement system was composed of tuneable attenuator, directional coupler, matching load, peak-peak value detector, oscillograph, t

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28

Zhao, Zizheng, Ling Tong, and Yu Tian. "Design and experiment for high-power microwave attenuator of rectangular waveguide." JOURNAL OF ELECTRONIC MEASUREMENT AND INSTRUMENT 24, no. 9 (2010): 842–47. http://dx.doi.org/10.3724/sp.j.1187.2010.00842.

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29

Nakano, Hiroshi, and Yoshihiko Kato. "Electrically controlled broadband microwave attenuator with p-i-n diode switches." Review of Scientific Instruments 70, no. 6 (1999): 2864–65. http://dx.doi.org/10.1063/1.1149809.

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30

Quine, Richard W., Mark Tseytlin, Sandra S. Eaton, and Gareth R. Eaton. "A very fast switched-attenuator circuit for microwave and RF applications." Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering 37B, no. 2 (2010): 39–44. http://dx.doi.org/10.1002/cmr.b.20157.

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31

Filippov, Ivan. "Phase and Amplitude Control Integrated Circuit in 0.18 μm SiGe BiCMOS for Sub-6 GHz Phased Array Applications". Journal of Integrated Circuits and Systems 16, № 2 (2021): 1–6. http://dx.doi.org/10.29292/jics.v16i2.229.

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This paper presents simulation results of the C-band transmit/receive (Tx/Rx) phased-arrays integrated circuit (IC) for sub-6 GHz communication links. It is based on 0.18 μm SiGe BiCMOS technology. Phase and amplitude control IC consists of one Tx/Rx channel. Digitally controlled phase shifter allows adjusting relative phase of the output microwave signal in the range from 0 to 360 degrees with 5.625 degree step (6-bit resolution). Digitally controlled active attenuator provides the transfer ratio adjusting in the range from 0 to –31 dB with 1 dB step (5 bit resolution). Amplitude and phase co

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32

MONDAL, J. P., A. G. MILNES та J. G. OAKES. "Theoretical analysis for microwave T- and π-type attenuator circuits using MESFETs". International Journal of Electronics 58, № 2 (1985): 231–347. http://dx.doi.org/10.1080/00207218508939019.

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33

Suzuki, Y., T. Ohira, and H. Ogawa. "Voltage-controlled biphase attenuator and vector synthesizer for monolithic microwave signal processors." IEEE Transactions on Microwave Theory and Techniques 46, no. 11 (1998): 1982–85. http://dx.doi.org/10.1109/22.734525.

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34

Sherar, M. D., H. Clark, B. Cooper, J. Kumaradas, and F. F. Liu. "A variable microwave array attenuator for use with single-element waveguide applicators." International Journal of Hyperthermia 10, no. 5 (1994): 723–31. http://dx.doi.org/10.3109/02656739409022450.

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35

Murtianta, Budihardja, Deddy Susilo, and Rizky Salenda. "Pemancar Modulasi Frekuensi dengan Modul GRF-3300." Techné : Jurnal Ilmiah Elektroteknika 17, no. 02 (2018): 81–92. http://dx.doi.org/10.31358/techne.v17i02.174.

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Dalam era teknologi telekomunikasi, sistem pemancar (transmitter) dan sistem penerima (receiver) merupakan hal yang sangat mendasar. Pada tulisan ini dibahas sisitem pemancar yang berperan untuk mengirim suatu sinyal informasi. Perngiriman informasi bisa lewat beberapa media transmisi, seperti serat optik, microwave, udara dan sbagainya.Pemancar ini mengirimkan sinyal informasi lewat udara dan terdiri dari : Modulator, mixer, PLL, preamplifier, attenuator, penguat daya, antena. Pada tulisan ini dijelaskan cara kerja prinsip dasar sistem pemancar dengan dengan modul GRF-3300.

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36

Adonin, A. S., A. Yu Evgrafov, Yu V. Kolkovskii, and V. M. Minnebaev. "Electromagnetic Modeling of a Monolithic Microwave Integrated Circuit Attenuator on AlGaN/GaN Heterostructures." Russian Microelectronics 50, no. 3 (2021): 197–205. http://dx.doi.org/10.1134/s1063739721020025.

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37

Chen, Yong, Peng Duan, Zhi-long Jia, et al. "Fast microwave calibration system for cryogenic device characterization." Journal of Instrumentation 17, no. 11 (2022): P11021. http://dx.doi.org/10.1088/1748-0221/17/11/p11021.

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Abstract We designed a calibration system to characterize the performance of microwave devices at low temperatures. This system comprises an in-situ calibration circuit and an adapted thru-reflect-line calibration algorithm, with which we can transfer the reference ports from room temperature to cryogenic temperature with high precision. We validated the circuit and the algorithm at room temperature with better than 0.9 dB accuracy. In addition, we demonstrated how we can extract the actual S 21 of a 20 dB attenuator and a high pass filter at 20 mK using this calibration system. The calibratio

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38

Wei, Ming, Ning Chen, Ju Zhou, and Jing Chao Du. "An Auto-Test System Based on VEE for the Improvemet of Target Position Precision." Advanced Materials Research 588-589 (November 2012): 953–56. http://dx.doi.org/10.4028/www.scientific.net/amr.588-589.953.

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The influence of amplitude and phase errors on precision of target position is analysed. To reduce amplitude and phase errors, iterative algorithm is applied in calibration. In this algorithm, amplitude and phase characteristics of all microwave components need to be tested.In this paper ,an auto-test system developed in VEE and based on GPIB serial bus technology is introduced. Compared with the traditional manual testing method, the anto-test system improves efficiency and accuracy on the test of digital attenuator and phase shifter with high resolution.

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39

Zhang, Yanchu, and Zhigang Kong. "Effect of Microwave Absorbing Material on the Straight-Through Performance of Millimetre Wave Coaxial Attenuator." Journal of Physics: Conference Series 1622 (September 2020): 012010. http://dx.doi.org/10.1088/1742-6596/1622/1/012010.

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40

Singh, Jasbir, Charanjeet Singh, Yang Bai, et al. "Role of phase, grain morphology and impedance properties in tailoring of Barium Strontium hexaferrites for microwave absorber/attenuator applications." Materials Science and Engineering: B 281 (July 2022): 115679. http://dx.doi.org/10.1016/j.mseb.2022.115679.

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41

Singh, Jasbir, Charanjeet Singh, Yang Bai, et al. "Role of phase, grain morphology and impedance properties in tailoring of Barium Strontium hexaferrites for microwave absorber/attenuator applications." Materials Science and Engineering: B 281 (July 2022): 115679. http://dx.doi.org/10.1016/j.mseb.2022.115679.

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42

Singh, Jasbir, Charanjeet Singh, Yang Bai, et al. "Role of phase, grain morphology and impedance properties in tailoring of Barium Strontium hexaferrites for microwave absorber/attenuator applications." Materials Science and Engineering: B 281 (July 2022): 115679. http://dx.doi.org/10.1016/j.mseb.2022.115679.

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43

Marquez-Segura, Enrique, Sang-Hee Shin, Attique Dawood, Nick M. Ridler, and Stepan Lucyszyn. "Microwave Characterization of Conductive PLA and Its Application to a 12 to 18 GHz 3-D Printed Rotary Vane Attenuator." IEEE Access 9 (2021): 84327–43. http://dx.doi.org/10.1109/access.2021.3087012.

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44

Navas-Guzmán, Francisco, Niklaus Kämpfer, Franziska Schranz, Wolfgang Steinbrecht, and Alexander Haefele. "Intercomparison of stratospheric temperature profiles from a ground-based microwave radiometer with other techniques." Atmospheric Chemistry and Physics 17, no. 22 (2017): 14085–104. http://dx.doi.org/10.5194/acp-17-14085-2017.

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Abstract. In this work the stratospheric performance of a relatively new microwave temperature radiometer (TEMPERA) has been evaluated. With this goal in mind, almost 3 years of temperature measurements (January 2014–September 2016) from the TEMPERA radiometer were intercompared with simultaneous measurements from other techniques: radiosondes, MLS satellite and Rayleigh lidar. This intercomparison campaign was carried out at the aerological station of MeteoSwiss at Payerne (Switzerland). In addition, the temperature profiles from TEMPERA were used to validate the temperature outputs from the

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45

BOLLI, P., L. CRESCI, F. HUANG, S. MARIOTTI, and D. PANELLA. "A HIGH TEMPERATURE SUPERCONDUCTOR MICROWAVE FILTER WORKING IN C-BAND FOR THE SARDINIA RADIO TELESCOPE." Journal of Astronomical Instrumentation 03, no. 01 (2014): 1450003. http://dx.doi.org/10.1142/s2251171714500032.

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A planar band-pass filter based on High Temperature Superconductor (HTS) has been designed for possible implementation in the cryogenic front-end of the C-band receiver for the Sardinia Radio Telescope. The band-pass filter is designed to operate at relatively high frequencies: center frequency 6.7 GHz with 30% bandwidth. Seven nominally identical filters have been fabricated to test different carrier materials and connector types aimed to keep the fabrication of the HTS filter simpler and more cost competitive. In addition to the conventional approach, silver plating, copper carriers and SMA

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46

Mital, P. Bhushan. "Optically Controlled Microwave Attenuators." Active and Passive Electronic Components 17, no. 4 (1995): 275–82. http://dx.doi.org/10.1155/1995/67190.

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The concept of photoconductivity is utilized in a number of microwave applications such as switches and attenuators. Optically controlled microwave attenuators prove an alternative to the conventional attenuators due to their simplicity, easy of operation, and very narrow ranges of continuously varying attenuation levels available. This paper describes the design of such configurations of optically controlled attenuators on a microstrip line fabricated on a semiconductor substrate.

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47

Богатов, Н. А., В. С. Сысоев, Д. И. Сухаревский та М. Ю. Наумова. "Микроволновая диагностика разрядов в искусственном облаке заряженных водяных капель". Журнал технической физики 92, № 3 (2022): 386. http://dx.doi.org/10.21883/jtf.2022.03.52133.284-21.

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The microwave diagnostics of discharges occurring in an artificial cloud of charged water droplets created in an open air simulating the environment of thunderclouds is implemented. An artificial cloud with a droplet size of about 1 microns is opaque in the visible range, so intra-cloud discharges are not available for investigation by traditional methods in the spark discharge physics based on the registration of visible discharge radiation. Microwaves pass through such a cloud without noticeable attenuation, they interact only with the plasma of discharges occurring in the cloud. The probing

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48

Bogatov N. A., Syssoev V.S., Sukharevsky D. I., and Naumova M. Yu. "Microwave diagnostics of electrical discharges in an artificial cloud of charged water drops." Technical Physics 92, no. 3 (2022): 306. http://dx.doi.org/10.21883/tp.2022.03.53260.284-21.

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The microwave diagnostics of discharges occurring in an artificial cloud of charged water droplets created in an open air simulating the environment of thunderclouds is implemented. An artificial cloud with a droplet size of about 1 microns is opaque in the visible range, so intra-cloud discharges are not available for investigation by traditional methods in the spark discharge physics based on the registration of visible discharge radiation. Microwaves pass through such a cloud without noticeable attenuation, they interact only with the plasma of discharges occurring in the cloud. The probing

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49

Al-Hartomy, Omar A., Falleh Al-Solamy, Ahmed Al-Ghamdi, Nikolay Dishovsky, Vladimir Iliev, and Farid El-Tantawy. "Dielectric and Microwave Properties of Siloxane Rubber/Carbon Black Nanocomposites and Their Correlation." International Journal of Polymer Science 2011 (2011): 1–7. http://dx.doi.org/10.1155/2011/837803.

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In this paper, the dielectric and microwave properties of carbon black/siloxane rubber-based nanocomposites have been investigated in the frequency range from 1 GHz till 12 GHz according to the content of carbon black and the frequency. It has been established that the increasing frequency and filler content lead to an increase in the relative permittivity and tangent of dielectric loss angle. At higher filler content, the effects become more pronounced, especially those upon dielectric loss. It has been also established that there are two well-distinguished areas in all dependences of microwa

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50

Djibo, Moumouni, Wendyam Boris Serge Ouedraogo, Ali Doumounia, et al. "ESTIMATION DE LA VISIBILITÉ MÉTÉOROLOGIQUE À L’AIDE DES LIENS MICRO-ONDES COMMERCIAUX DE TÉLÉCOMMUNICATIONS." Journal de Physique de la SOAPHYS 3, no. 1 (2021): C21A03–1—C21A03–4. http://dx.doi.org/10.46411/jpsoaphys.2021.01.03.

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Several factors can attenuate radio signal between transmitting and receiving antenna. One can cite: vegetation, atmospheric gases, fog, water vapor, transmission instruments, rain, temperature, etc... The sources of attenuation differ according to the climate and the relief of each continent or even each country. In this work we aim to show that there is link between microwave signal attenuation and weather visibility in the presence of dust. Weather visibility is a very important factor for the safety of road, sea, rail and air transportation. In the presence of dust, the visibility is stron

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