Analysis of Target Detection Capability of Infrared Fiber Image Bundle Optical System

Shengjie Liu; Junwei Li; Hao Chen; Shengqian Wang

doi:10.3788/AOS240652

Acta Optica Sinica, Volume. 44, Issue 13, 1311001(2024)

Analysis of Target Detection Capability of Infrared Fiber Image Bundle Optical System

Shengjie Liu^1,2,3,4, Junwei Li^1,2,3,4, Hao Chen^1,2,3、*, and Shengqian Wang^1,2,3,4

Author Affiliations

¹Key Laboratory of Adaptive Optics, Chinese Academy of Sciences, Chengdu 610209, Sichuan , China

²National Laboratory on Adaptive Optics, Chengdu 610209, Sichuan , China

³Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, Sichuan , China

⁴University of Chinese Academy of Sciences, Beijing 100049, China

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Figures & Tables(18)

Fig. 1. Structural schematic diagram of hexagonal fiber bundle coupling optical system

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Fig. 2. Schematic diagrams of two types of fiber optic bundles with different spatial arrangements. (a) Square arrangement; (b) hexagonal arrangement

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Fig. 3. Front telescopic system. (a) Optical structure diagram; (b) spot diagram; (c) MTF

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Fig. 4. Rear coupling system. (a) Optical structure diagram; (b) spot diagram; (c) MTF

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Fig. 5. Infrared detection system. (a) Optical structure diagram; (b) spot diagram; (c) MTF

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Fig. 6. Point spread function of infrared detection system

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Fig. 7. Calculation process of the average $F_{P V}$ of the traditional optical system

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Fig. 8. Target images at different positions. (a) At the center of the pixel; (b) at the right edge of the pixel; (c) at the upper right corner of the pixel

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Fig. 9. Point spread functions. (a) Front telescopic system; (b) rear coupling system

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Fig. 10. Fiber characteristic function distributions. (a) Fiber receiving aperture function (fiber pulse response function); (b) fiber spatial sampling function

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Fig. 11. Corresponding relationship between pixel array and fiber array image

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Fig. 12. Calculation process of the average $F_{P V}^{'}$ of the fiber bundle optical system

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Fig. 13. Simulation imaging of fiber bundle optical system. (a) Image of the input surface of the fiber bundle; (b) image of the output surface of the fiber bundle; (c) detector surface image; (d) detector output image (normalized)

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Fig. 14. $F_{P V}^{'}$ distributions of different detector pixels. (a) Variation of pixel $F_{P V}^{'}$ with pixel index; (b) variation of pixel average $F_{P V}^{'}$ with different pixel numbers

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Fig. 15. Distribution of fiber-pixel coupling area corresponding to different pixels

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Fig. 16. Relationship between detection SNR attenuation coefficient and fiber transmittance

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Table 1. Parameter table of long-wave infrared fiber bundle optical system^[10]

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Table 1. Parameter table of long-wave infrared fiber bundle optical system^[10]

System type	Parameter	Value
Front telescopic system	Wavelength / $μ m$	8-12
	Aperture /mm	$80$
	Focal length /mm	$58.5$
	Field of view /［（°）×（°）］	$2.30 \times 0.17$
	Distortion /%	$< 0.1$
	Imaging NA	$0.56$
Rear coupling system	Wavelength / $μ m$	8-12
	Magnification	$2$
	Distortion /%	$< 0.5$
	Objective NA	$0.46$
Cooling infrared detector	Wavelength / $μ m$	8-12
	Resolution	$320 \times 256$
	Photosensitive size / $μ m$	$25$
	Pixel spacing / $μ m$	$30$

Table 2. Parameter table of a commercial long-wave infrared fiber bundle^[12]
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Table 2. Parameter table of a commercial long-wave infrared fiber bundle^[12]
Parameter Value
Wavelength / $μ m$ 3-11.5
Resolution /（lp/mm） $\geq 20$
Breakage rate /% $\leq 1$
Crosstalk rate /% $\leq 2$
Maximum pixel number $\geq 10^{6}$
Minimum core diameter / $μ m$ $10$
Typical transmission loss /（dB/m） $< 1$

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Shengjie Liu, Junwei Li, Hao Chen, Shengqian Wang. Analysis of Target Detection Capability of Infrared Fiber Image Bundle Optical System[J]. Acta Optica Sinica, 2024, 44(13): 1311001

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