Chinese Journal of Lasers, Volume. 49, Issue 13, 1310002(2022)
Multichannel Pure Rotational Raman Spectroscopic System for Absolute-Probing Temperature Lidar Throughout a Day
Figures & Tables(10)
Fig. 1. Pure rotational Raman spectra of nitrogen molecular. (a) Relationship between even-rotational quantum number and adjacent Raman lines; (b) backscattering cross-section
Fig. 2. Pure rotational Raman laser lidar for atmospheric temperature absolute detection throughout a day
Fig. 3. Relationship between FSR of FPI and wavelength difference between adjacent pure rotational quantum number Raman spectra
Fig. 4. Matching of FPI transmittance with pure rotational Raman spectra of N2. (a) Deviation analysis; (b) schematic
Fig. 5. Maximum and minimum transmittance of FPI under different effective fineness values. (a) Maximum transmittance; (b) minimum transmittance
Fig. 6. Performance analysis of pure rotational Raman lidar. (a) Lidar echo power in typical channel; (b) signal-noise-ratio (SNR) in typical channel
Table 1. Primary specifications of pure rotational Raman lidar
View tableTable 1. Primary specifications of pure rotational Raman lidar
Parameter Value Exciting wavelength /nm 532.0 Pulse energy /mJ 300 Pulse duration /ns 10 Pulse repetition frequency /Hz 20 Diameter of telescope /mm 300 Field of view /mrad 0.5 Spatial resolution /m 3.75(@25 ns) PMT quantum efficiency 0.17
Table 2. Primary parameters of FPI
View tableTable 2. Primary parameters of FPI
Parameter Value a 0.001 R 0.9519 n 1.0003 h /μm 629.300 FD 45.63 FWMH /pm 6 Maximum transmittance 0.556 Suppression ratio to elastic scattering /dB 30
Table 3. Performance parameters of multi-channel Raman spectroscope
View tableTable 3. Performance parameters of multi-channel Raman spectroscope
Parameter Value J＝6 J＝8 J＝10 J＝12 J＝14 J＝16 J＝18 J＝20 Transmittance 0.315 0.267 0.242 0.240 0.266 0.331 0.429 0.395 Suppression rate /dB 57 60.5 65 60.5 67.9 69.3 69 69.5
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Shichun Li, Xu Wang, Penghui Zhang, Wenhui Xin, Dengxin Hua, Xianglong Hu, Yuehui Song. Multichannel Pure Rotational Raman Spectroscopic System for Absolute-Probing Temperature Lidar Throughout a Day[J]. Chinese Journal of Lasers, 2022, 49(13): 1310002
Paper Information
Category: remote sensing and sensor
Received: Oct. 26, 2021
Accepted: Dec. 22, 2021
Published Online: Jun. 13, 2022
The Author Email: Li Shichun (lsczqz@xaut.edu.cn), Hua Dengxin (dengxinhua@xaut.edu.cn)
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