Acta Optica Sinica, Volume. 44, Issue 12, 1201013(2024)
Impact Analysis of Multi-Baseline Transmission Photoelectric Measurement on Atmospheric Extinction Coefficient
Figures & Tables(21)
Fig. 2. Schematic diagram of optical path for multi-baseline extinction coefficient measurement system
Fig. 5. Minimum output signal allowed for each movement distance and normalized response of signals in various radiation bands. (a) Minimum output signal; (b) normalized response
Fig. 6. Analysis results of noise characteristics of detection circuit. (a) Lower limit of feedback capacitance value; (b) variation of circuit SNR with feedback resistance when output voltage range is 0.1-5.0 V
Fig. 7. Variation of extinction coefficient measured in each band with baseline distance when output voltage is 0.001 V
Fig. 8. Measurement of background noise and time-domain statistical characteristics in detection circuit. (a) Measurement of background noise; (b) time-domain statistical characteristics
Fig. 9. Experimental results of three methods for noise resistance. (a) Relation between relative error and SNR; (b) when SNR is 30 dB, relative standard deviation varies with sampling time; (c) when SNR is 0, relative standard deviation varies with sampling time; (d) when SNR is -30 dB, relative standard deviation varies with sampling time
Fig. 10. Variation of correlation coefficient of signals at both ends with time difference under various SNR
Fig. 12. Variation of relative standard deviation of transmittance measurement with time difference. (a) Calculation results of three digital signal processing methods; (b) when time difference is 20 ms, calculation result of spectrum peak search method
Fig. 13. Experimental results of measurement uncertainty in extinction coefficient (confidence factor k is 2). (a) Influence of stability of fixed-point transmittance measurement on extinction coefficient; (b) influence of the number of measurement points at receiving unit on extinction coefficient
Fig. 14. Variation of measurement uncertainty in extinction coefficient with maximum baseline distance
Fig. 16. Changes in transmittance, environmental temperature and relative humidity over time based on dual baseline operation
Table 1. Main component parameters of the system
View tableTable 1. Main component parameters of the system
Main component Parameter Value Halogen lamp Stability /% 0.1 Filter Center wavelength /nm 440, 550, 670, 870, 1020 Condenser Diameter /mm 25.4 Focal length /mm 100 Projection lens Diameter /mm 50.8 Focal length /mm 500 Receiving lens Diameter /mm 101.6 Focal length /mm 500 Photoelectric detection circuit Spectral response range /nm 190-1100 Detector model S2281 Photosensitive area /mm2 100 Output voltage /V 0-5
Table 2. Comparison of three methods for resisting random noise interference at different time differences
View tableTable 2. Comparison of three methods for resisting random noise interference at different time differences
SNR /dB Relative standard deviation ofleast square /% Relative standard deviation ofspectrum peak search /% Relative standard deviation of sampling integral technique /% 0 100 μs 200 μs 0 100 μs 200 μs 0 100 μs 200 μs -40 13.99239 13.74588 13.45172 19.60331 16.99387 17.06486 15.80145 15.14495 14.98034 -35 7.98977 7.71484 7.77237 8.46120 8.27858 8.14378 8.87239 8.50515 8.51167 -30 4.51348 4.48835 4.69099 4.83751 4.74722 5.01228 5.07233 4.92492 5.27868 -25 2.46623 2.38280 2.58076 2.71005 2.53948 2.64014 2.82342 2.67093 2.71224 -20 1.38247 1.43152 1.42385 1.47346 1.55263 1.51342 1.49811 1.57827 1.55441 -15 0.78989 0.80610 0.75481 0.82560 0.84613 0.78921 0.86892 0.90899 0.81423 -10 0.45251 0.42087 0.44417 0.48578 0.45317 0.47658 0.50542 0.47592 0.49392 -5 0.25167 0.25425 0.26199 0.27433 0.27584 0.27927 0.28344 0.28963 0.28759 0 0.14459 0.14066 0.13998 0.15586 0.14946 0.14964 0.16124 0.15392 0.15217 5 0.07514 0.07973 0.08228 0.07945 0.08546 0.08831 0.08237 0.08739 0.09151 10 0.04525 0.04329 0.04425 0.04837 0.04683 0.04583 0.04907 0.04815 0.04783 15 0.02518 0.02579 0.02406 0.02722 0.02726 0.02615 0.02766 0.02788 0.02714 20 0.01488 0.01470 0.01517 0.01608 0.01533 0.01589 0.01680 0.01596 0.01602 25 0.00803 0.00879 0.00859 0.00861 0.00915 0.00870 0.00892 0.00946 0.00902 30 0.00523 0.00545 0.00589 0.00548 0.00546 0.00540 0.00566 0.00561 0.00561 35 0.00360 0.00397 0.00434 0.00373 0.00383 0.00373 0.00377 0.00384 0.00386 40 0.00283 0.00326 0.00397 0.00285 0.00301 0.00311 0.00287 0.00304 0.00321 45 0.00264 0.00295 0.00362 0.00262 0.00265 0.00266 0.00260 0.00266 0.00267 50 0.00253 0.00289 0.00356 0.00249 0.00256 0.00260 0.00250 0.00255 0.00261 55 0.00252 0.00285 0.00354 0.00249 0.00251 0.00258 0.00249 0.00250 0.00257 60 0.00250 0.00284 0.00353 0.00247 0.00249 0.00255 0.00247 0.00248 0.00255
Table 3. Standard deviation of transmittance with different SNR
View tableTable 3. Standard deviation of transmittance with different SNR
SNR /dB Output current /A Transmittance Standard deviation of transmittance Spectrum peak search Sampling integral technique -40 1.074×10-12 8.448×10-6 1.436×10-6 1.279×10-6 -35 1.910×10-12 1.502×10-5 1.244×10-6 1.278×10-6 -30 3.396×10-12 2.671×10-5 1.268×10-6 1.316×10-6 -25 6.039×10-12 4.751×10-5 1.206×10-6 1.269×10-6 -20 1.074×10-11 8.448×10-5 1.312×10-6 1.333×10-6 -15 1.910×10-11 1.502×10-4 1.271×10-6 1.366×10-6 -10 3.396×10-11 2.671×10-4 1.211×10-6 1.271×10-6 -5 6.039×10-11 4.751×10-4 1.310×10-6 1.376×10-6 0 1.074×10-10 8.448×10-4 1.263×10-6 1.300×10-6 5 1.910×10-10 1.502×10-3 1.284×10-6 1.313×10-6 10 3.396×10-10 2.671×10-3 1.251×10-6 1.286×10-6 15 6.039×10-10 4.751×10-3 1.295×10-6 1.324×10-6 20 1.074×10-9 8.448×10-3 1.295×10-6 1.348×10-6 25 1.910×10-9 1.502×10-2 1.374×10-6 1.421×10-6 30 3.396×10-9 2.672×10-2 1.459×10-6 1.499×10-6 35 6.040×10-9 4.752×10-2 1.818×10-6 1.825×10-6 40 1.074×10-8 8.451×10-2 2.543×10-6 2.571×10-6 45 1.911×10-8 1.503×10-1 3.984×10-6 3.992×10-6 50 3.400×10-8 2.675×10-1 6.849×10-6 6.821×10-6 55 6.052×10-8 4.761×10-1 1.197×10-5 1.192×10-5 60 1.078×10-7 8.479×10-1 2.109×10-5 2.103×10-5
Table 4. Standard deviation of transmittance at various modulation frequencies under dark background
View tableTable 4. Standard deviation of transmittance at various modulation frequencies under dark background
Modulation frequency /Hz Group 1 Group 2 Group 3 Group 4 Group 5 Group 6 Group 7 Group 8 Mean value 18.750 3.013 4.168 2.119 2.468 2.186 3.061 2.156 2.249 2.678 25.977 4.677 4.683 1.508 2.889 3.572 1.878 2.390 2.659 3.032 32.831 4.410 4.277 1.283 2.176 1.979 2.781 2.815 2.513 2.779 39.843 2.414 3.404 2.813 2.559 2.422 1.939 1.997 4.137 2.711 46.113 4.690 4.413 1.903 2.833 2.585 2.565 2.094 1.873 2.869 53.108 2.648 2.883 1.933 1.963 3.319 2.254 2.670 1.705 2.422 59.337 3.217 3.054 2.263 2.282 2.354 2.513 4.565 3.099 2.918 65.301 2.878 3.023 2.003 2.565 3.254 3.514 4.444 3.923 3.200 70.956 3.982 3.787 2.339 2.843 3.518 2.666 2.867 2.388 3.049 77.346 3.356 3.718 2.921 1.911 1.631 1.564 2.369 2.275 2.468
Table 5. Standard deviation of transmittance at various modulation frequencies under natural light background
View tableTable 5. Standard deviation of transmittance at various modulation frequencies under natural light background
Modulation frequency /Hz Group 1 Group 2 Group 3 Group 4 Group 5 Group 6 Group 7 Group 8 Mean value 18.750 16.677 8.933 7.709 4.730 14.303 6.076 12.885 7.296 9.826 25.976 12.816 8.108 8.128 5.947 7.280 6.755 7.112 5.811 7.745 32.831 9.750 9.962 4.208 9.661 4.739 8.526 9.425 10.670 8.368 39.843 11.661 5.906 10.417 5.011 12.633 8.358 6.189 6.601 8.347 46.113 7.360 6.842 5.443 6.525 8.254 4.712 4.843 4.764 6.093 53.107 8.571 7.328 9.357 8.357 4.884 12.789 19.532 10.133 10.119 59.337 9.703 9.889 2.904 12.102 4.684 4.994 5.580 7.362 7.152 65.301 8.639 4.424 8.203 3.953 6.063 11.230 13.029 8.150 7.961 70.957 12.189 5.608 8.655 8.471 9.019 6.424 6.739 10.658 8.470 77.347 6.807 9.305 7.431 9.834 16.150 5.724 14.445 9.194 9.861
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Hanhui Cao, Hongyao Chen, Liming Zhang, Jiawei Li. Impact Analysis of Multi-Baseline Transmission Photoelectric Measurement on Atmospheric Extinction Coefficient[J]. Acta Optica Sinica, 2024, 44(12): 1201013
Paper Information
Category: Atmospheric Optics and Oceanic Optics
Received: Feb. 8, 2024
Accepted: Apr. 12, 2024
Published Online: Jun. 7, 2024
The Author Email: Chen Hongyao (hychen@aiofm.ac.cn)
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