Infrared and Laser Engineering, Volume. 53, Issue 1, 20230466(2024)
Research on multi-element detection technology and system for spaceborne ocean profile
Figures & Tables(24)
Fig. 2. The optical transmittance window of seawater and the selection of laser working materials
Fig. 5. The relationship between laser energy and receiving apertrue
Fig. 6. Echo power at different depths. (a) At 486 nm; (b) At 532 nm
Fig. 7. Inversion of temperature and salinity using frequency shift linewidth
Fig. 8. Inversion error. (a) Temperature inversion error; (b) Salinity inversion error
Fig. 11. Error analysis of particle scattering function under different SNR
Fig. 17. Schematic diagram of a highly sensitive optoelectronic integrated detection spectral detection scheme for large dynamic scattering signals
Fig. 19. Schematic diagram for analyzing the angle and translation error of segmented gratings
Table 1. System indicator parameters
View tableView in ArticleTable 1. System indicator parameters
No. Category Target Application 1 Orbital height ≥400 km Efficient global measurement of ocean parameters 2 Depth of ocean profile ≥100 m Acquisition of underwater topography and profile information of ocean 3 Depth of shore profile ≥4/Kd Acquisition of underwater topography and profile information of shore 4 Vertical resolution ≤0.5 m Vertical hierarchical information 5 Backscatter measurement error ≤25% Water quality inversion and monitoring 6 Temperature profile error ≤0.5 ℃ Global climate projections, air-sea interaction research, marine biology protection 7 Salinity profile error ≤1 psu Aquaculture, sea water chemical industry
Table 2. FOV and dynamic range settings for each channel
View tableView in ArticleTable 2. FOV and dynamic range settings for each channel
Channel Wavelength/nm FOV/urad Method Range/W 1 532 120 Shallow water/Linear 1.3×10−5 (0 m) 8.1×10−8 W(20 m) 2 532 200 Deep water/Photonic 1.2×10−7 (15 m) 4.4×10−10 (50 m) 3 532 120 Laser spectrum/Photonic 3.2×10−8 (0 m) 1.4×10−9 (23 m) 4 486 120 Shallow water/Linear 1.4×10−6 (0 m) 1.0×10−8 (55 m) 5 486 200 Deep water/Photonic 2.6×10−8 (50 m) 5.2×10−10 (100 m)
Table 3. System indicators
View tableView in ArticleTable 3. System indicators
Laser 30 mJ@486 nm 35 mJ@532 nm 4 ns Emission FOV≤0.03 mrad Linewidth≤200 MHz@532 nm Photoelectric receiving and detecting system Detection sensitivity≤100 pW Optical efficiency 0.5 532 nm：shallow channel 1, deep channel 2, spectrum channel 3 ; 486 nm：shallow channel 4, deep channel 5 Diameter 2.5 m Performance Orbital height 400 km Depth of ocean profile ≥100 m Depth of shore profile ≥4/Kd Vertical resoluton ≤0.5 m Backscatter measurement error ≤25% Temperature profile error ≤0.5 ℃ Salinity profile error ≤1 psu
Table 4. Grating design parameters
View tableView in ArticleTable 4. Grating design parameters
No. Grating grove/(°) Density 1 20-24 1330-1611 2 25-28 1611-1727 3 29-31 1727-1783 4 32-33 1783-1813 5 34-35 1813-1831
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Qian Sun, Zhenmin Shen, Song Yang, Zihao Wang, Yuanqing Wang, Kun Liang, Weidong Shang, Peipei Wang, Yue Yu, Hao Zhao, Hong Lv, Zhengkun Liu, Yongchao Zheng. Research on multi-element detection technology and system for spaceborne ocean profile[J]. Infrared and Laser Engineering, 2024, 53(1): 20230466
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Received: Jul. 28, 2023
Accepted: --
Published Online: Mar. 19, 2024
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