Acta Photonica Sinica, Volume. 49, Issue 4, 0411001(2020)
An Improved Apparent Distance Model for Direct-viewlow-light-level Night Vision System
Figures & Tables(15)
Fig. 2. Human eye intermediate visual response when P43 screen displays
Fig. 3. Radiation spectral distribution of full moonlight and clear starlight conditions
Fig. 7. Spectral reflection irradiance of three kinds of night radiation conditions
Table 1. Several constants in the composite vision model
View tableView in ArticleTable 1. Several constants in the composite vision model
T /secX e/degN e/cycΦ 0/(sec deg2)f 0/(cyc·deg-1)K σ 0/deg0.1 12 15 3×10-8 8 4 0.013 7
Table 2. Related parameters of Gen2 and Gen3 under different nighttime radiation conditions
View tableView in ArticleTable 2. Related parameters of Gen2 and Gen3 under different nighttime radiation conditions
Radiation Kx C 0Gen2 Gen3 α (S ,Ex )k k k cα (S ,Ex )k k k cFull moon ClothGrass 60.26865.475 0.582 0.6730.683 1.5101.410 1.460 1.048 0.6570, 681 1.5521.480 1.516 1.033 Moon+Stars ClothGrass 55.82360.527 0.581 0.6490.659 1.5721.472 1.522 1.046 0.6350.658 1.6191.547 1.583 1.032 Stars ClothGrass 12.13412.823 0.578 0.4110.429 4.5804.523 4.551 1.009 0.4220.443 4.9504.918 4.934 1.005 Stars withclouds Cloth 12.134 0.578 0.411 4.580 4.551 1.009 0.422 4.950 4.934 1.005
Table 3. Parameters required for model calculation
View tableView in ArticleTable 3. Parameters required for model calculation
Parement S Aτ 0G ρ f 0′τ dE BIFΦ Value 1600 μ A/lm0.85 20 000 0.37 20.7 mm 0.91 0.25 μ lx6.97 Parement f e′H tN et D C dδ Value 20.7 mm 0.94 m 4 0.2 s 16 mm 0.89 28
Table 4. Transfer function of helmet night vision system
View tableView in ArticleTable 4. Transfer function of helmet night vision system
f /(lp·mm-1)5 10 15 20 25 33 35 MTF 0.71 0.49 0.294 0.19 0.11 0.035 0.025
Table 5. The recognition distance of the Gen3 helmet to the target person
View tableView in ArticleTable 5. The recognition distance of the Gen3 helmet to the target person
Full moon 1/4Moon+Stars Stars Stars with clouds 2×10-1 lx 1×10-2 lx 1×10-3 lx 2×10-4 lx G 1 076 20 000 20 000 20 000 C 00.582 0.581 0.578 0.578 Experimental data / / 100.0 m 60.0 m Original model 211.2 m 128.3 m 95.2 m 43.6 m E BI correction211.2 m 128.3 m 95.1 m 42.8 m k c correction218.2 m 129.3 m 95.3 m 43.7 m MTFeye correction 209.1 m 140.6 m 104.4 m 60.6 m Modified model 216.0 m 141.5 m 104.3 m 59.7 m
Table 6. The recognition distance of the Gen2 helmet to the target person
View tableView in ArticleTable 6. The recognition distance of the Gen2 helmet to the target person
Full moon 1/4Moon+Stars Stars Stars with clouds 2×10-1 lx 1×10-2 lx 1×10-3 lx 2×10-4 lx G 1 076 10 000/15 000 10 000/15 000 10 000/15 000 C 00.582 0.581 0.578 0.578 Original model 163.1 m 111.1 m/113.1 m 75.6 m/78.9 m 28.5 m/31.2 m E BI correction163.1 m 111.1 m/113.1 m 75.5 m/78.7 m 27.9 m/30.6 m k c correction164.7 m 112.5 m/114.5 m 75.8 m/79.1 m 28.7 m/31.4 m MTFeye correction 165.1 m 123.9 m/128.1 m 87.9 m/91.8 m 47.0 m/50.1 m Modified model 166.1 m 125.0 m/129.2 m 88.1 m/92.0 m 46.7 m/49.7 m
Tools
Get Citation
Copy Citation Text
Wei-qi JIN, Qin ZHANG, Xia WANG, Li LI, Su QIU. An Improved Apparent Distance Model for Direct-viewlow-light-level Night Vision System[J]. Acta Photonica Sinica, 2020, 49(4): 0411001
Paper Information
Category: Imaging Systems
Received: Dec. 13, 2019
Accepted: Jan. 20, 2020
Published Online: Apr. 24, 2020
The Author Email:
© Copyright 2018-2021 | Chinese Laser Press.
All Rights Reserved 沪ICP备15018463号-20