Infrared and Laser Engineering, Volume. 51, Issue 8, 20210929(2022)
Study of testing the detecting SNR of point target imaging infrared remote sensing systems
Figures & Tables(12)
Table 1. Parameters of the SNR testing system
View tableView in ArticleTable 1. Parameters of the SNR testing system
Technical parameter Value Infrared target background simulator Cold diaphragm Emissivity >0.97 Effective emission area 100 mm×100 mm Effective diameter of transmitting hole 10-100 μm （Optional） Thickness of cold diaphragm 0.5 mm Working temperature 230-270 K （Adjustable） Blackbody Emissivity >0.99 Working temperature 270-760 K （Adjustable） 3D electric moving machine Motion stroke ≥20 mm Control accuracy 10 μm Cryogenic collimator Focal length 1200 mm Primary mirror aperture 300 mm Working temperature ≤200 K Vacuum cryogenic tank Size Φ4.4 m×6 m Temperature ≤100 K
Table 2. Main parameters of the infrared remote sensing system to be tested
View tableView in ArticleTable 2. Main parameters of the infrared remote sensing system to be tested
Technical parameter Value Aperture of optical system 250 mm Focal length of optical system 425 mm Detection magnitude −20 stars Signal to noise ratio ≥5 Field of view 0.85°×0.68° Number of detector pixels 640×512 Spectral range 3-5 μm
Table 3. Main parameters of the collimator
View tableView in ArticleTable 3. Main parameters of the collimator
Technical parameter Value Aperture of optical system Φ300 mm Focal length of optical system 1200 mm Spectral range 0.4-16 μm Field of view 2ω≥0.15° Central field wave aberration RMS≤λ/30, λ=632.8 nm
Table 4. Measurement uncertainty analysis
View tableView in ArticleTable 4. Measurement uncertainty analysis
Variable Factors affecting measurement uncertainty Relative uncertainty σ1 Blackbody emissivity of low temperature area source 2.00% σ2 Cold aperture emissivity 0.53% σ3 Low temperature non-point source blackbody temperature 0.75% σ4 Cold diaphragm temperature 0.20% σ5 Collimator reflectivity 0.10% σ6 Effect of collimator stray light 0.20% σ7 Uncertainty of aperture area measurement 0.50% σ8 Uncertainty of diaphragm thickness measurement 0.30% σ9 Algorithm error caused by target phase 1.50% σ10 Test system noise error 0.50% Total uncertainty 2.78%
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Xiaoman Li, Bin Hu, Jialiang He, Jianyun Ge, Ji Zhou, Bing Xu. Study of testing the detecting SNR of point target imaging infrared remote sensing systems[J]. Infrared and Laser Engineering, 2022, 51(8): 20210929
Paper Information
Category: Infrared technology and application
Received: Dec. 2, 2021
Accepted: --
Published Online: Jan. 9, 2023
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