Research on Signal-to-noise Ratio of Low-light Level Image Intensifier Based on Night Sky Light Spectrum Matching

Qin ZHANG; Xiaofeng BAI; Hongchang CHENG; Gangcheng JIAO; Zhoukui LI; Kun HAN; Qi LI

doi:10.3788/gzxb20225103.0304005

Journals >Acta Photonica Sinica >Volume 51 >Issue 3 >Page 0304005 > Article

Acta Photonica Sinica
Vol. 51, Issue 3, 0304005 (2022)

Research on Signal-to-noise Ratio of Low-light Level Image Intensifier Based on Night Sky Light Spectrum Matching

Qin ZHANG^1、2、*, Xiaofeng BAI^1、2, Hongchang CHENG^1、2, Gangcheng JIAO^1、2, Zhoukui LI^1、2, Kun HAN^1、2, and Qi LI^1、2

Author Affiliations

¹Key Laboratory of Science and Technology on Low-Level-Light Night Vision，Xi'an 710065，China

²Kunming Institute of Physics，Kunming 650223，China

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DOI: 10.3788/gzxb20225103.0304005 Cite this Article

Qin ZHANG, Xiaofeng BAI, Hongchang CHENG, Gangcheng JIAO, Zhoukui LI, Kun HAN, Qi LI. Research on Signal-to-noise Ratio of Low-light Level Image Intensifier Based on Night Sky Light Spectrum Matching[J]. Acta Photonica Sinica, 2022, 51(3): 0304005 Copy Citation Text

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Fig. 1. Schematic diagram of the structure of the low-light image intensifier

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Fig. 2. Radiation spectral distribution of full moonlight and clear starlight

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Fig. 3. Spectral irradiance distribution of three natural conditions

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Fig. 4. Spectral reflectance of grass

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Fig. 5. Spectral reflection irradiance of three kinds of night radiation conditions

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Fig. 6. The cathode spectral sensitivity of Gen2 and Gen3

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Radiation	$K_{x}$ /（lm·W^-1）	$α (S, E_{x})$		$k$
Radiation	$K_{x}$ /（lm·W^-1）	Gen2	Gen3	Gen2	Gen3
Full moon	60.268	0.673	0.657	1.510	1.552
Stars+¼moon	55.823	0.649	0.635	1.572	1.619
Stars	12.134	0.411	0.422	4.580	4.950
Stars with clouds	12.134	0.411	0.422	4.580	4.950

Table 1. Related parameters of Gen2 and Gen 3 under different night radiation conditions

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	S_A/（ $μ A \cdot l m^{- 1}$ ）	$F_{Φ}$	$Φ$		$δ$
	S_A/（ $μ A \cdot l m^{- 1}$ ）	$F_{Φ}$	Experimental	Calculation	$δ$
Gen2	702	1.15	25.41	25.83	1.6%
Gen3	1 856	2.48	27.88	28.13	0.9%

Table 2. Typical parameters of Gen2 and Gen3

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$a$ / $m m$	S_A/（ $μ A \cdot l m^{- 1}$ ）		$F_{Φ}$		$E_{B I}$ / $μ l x$	Objective lens system parameters
$a$ / $m m$	Gen2	Gen3	Gen2	Gen3	$E_{B I}$ / $μ l x$	$f_{0}^{'} / m m$	D/ $m m$	τ₀
0.2	702	1 856	1.15	2.48	0.25	20.7	16	0.85

Table 3. Parameters required for the signal-to-noise ratio calculation

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	A light	Stars with clouds	$δ$
	7.44×10^-6lx	7.44×10^-6lx	$δ$
Gen2	6.56	14.05	114%
Gen3	7.27	16.18	123%
Δ	0.71	2.13

Table 4. The output signal-to-noise ratio of Gen2 and Gen3 under the stars with clouds

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	A light	Stars	$δ$
	3.72×10^-5lx	3.72×10^-5lx	$δ$
Gen2	14.88	31.84	114%
Gen3	16.47	36.65	123%
Δ	1.59	4.81

Table 5. The output signal-to-noise ratio of Gen2 and Gen3 under the stars

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	A light	Stars+¼moon	$δ$
	3.72×10^-4lx	3.72×10^-4lx	$δ$
Gen2	47.20	59.17	25%
Gen3	52.25	66.49	27%
Δ	5.05	7.32

Table 6. The output signal-to-noise ratio of Gen2 and Gen3 under the stars with ¼moon

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