Journal of Applied Optics, Volume. 44, Issue 4, 887(2023)
Improved apparent distance detection model of low-level-lightnight vision system
Figures & Tables(16)
Fig. 3. Theoretical values of simplified compound model and measured data of Campbell
Fig. 4. Theoretical values of simplified compound model and measured data of Watanabe
Fig. 7. Radiation spectral distribution curves of full moonlight and clear starlight conditions
Fig. 9. Reflected radiation illuminance of clear starlight and full moonlight under green vegetation scene conditions
Fig. 10. Calculation of spectral conversion coefficient αλ of clear starlight and full moonlight under green vegetation scene conditions of New S25photocathode
Table 1. Typical values for some parameters in compound model
View tableView in ArticleTable 1. Typical values for some parameters in compound model
K T / sec Xe / deg Φ0 / (sec·deg2) Ne/ cyc 3.4 0.1 12 3×10−8 15
Table 2. Typical values for some parameters in compound model
View tableView in ArticleTable 2. Typical values for some parameters in compound model
ηe A0 / (cyc·deg−1) P / (photons / (td·sec·deg2)) σ0 / deg Csph / (deg·mm−3) 0.03 8 1.285×106 0.0137 1×10−4
Table 3. Parameters required for calculation
View tableView in ArticleTable 3. Parameters required for calculation
Parement D/mm f′o/mm Q δe gm t/s Value 18 26 0.3 8 10813.17 0.2 Parement Ht/m Ne ε E0/lx τd R′/mm Value person: 0.5 vehicle: 2 person: 4 vehicle: 6 person: 28 vehicle: 24 10−3 0.8 9.7 Parement l/mm Г X0/deg Value 10 3.4 28
Table 4. Modulation transfer function of image intensifier
View tableView in ArticleTable 4. Modulation transfer function of image intensifier
Ak/(lp·mm−1) 2.5 7.5 15 25 30 MTF 0.86 0.65 0.42 0.22 0.15
Table 5. Calculation results for parameters related to spectral distribution
View tableView in ArticleTable 5. Calculation results for parameters related to spectral distribution
Full Moonlight Stars Background Transparent Green vegetation Transparent Green vegetation Target Man Vehicle Man Vehicle Man Vehicle Man Vehicle ρ 0.5778 0.5484 0.2404 0.211 0.5844 0.5456 0.3686 0.3298 C0 0.749 0.8072 0.1767 0.3156 0.6932 0.8158 0.2403 0.4894 Cd 0.943 0.9402 0.8732 0.858 0.626 0.6098 0.6136 0.4858 αλ 0.3924 0.2678 0.66 0.3645 1.3715 0.7917 2.636 1.0935
Table 6. Apparent distance of LLL night vision equipment to people and vehicles under clear starlight and full moonlight conditions
m View tableView in ArticleTable 6. Apparent distance of LLL night vision equipment to people and vehicles under clear starlight and full moonlight conditions
m Man Vehicle Experimental data 100.0 200.0 Original model 87.0 208.0 Modified model 92.14 205.60
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Yongchao MO, Lei LIU, Yunsheng QIAN, Chaolong HU, Xiaofeng BAI, Feng SHI. Improved apparent distance detection model of low-level-lightnight vision system[J]. Journal of Applied Optics, 2023, 44(4): 887
Paper Information
Category: Research Articles
Received: Nov. 3, 2022
Accepted: --
Published Online: Aug. 10, 2023
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