Design and Experiment of Time-sharing Ultraviolet Polarization Imaging Detection System

Fig. 3. Optical system design drawing. (a) System light path diagram; (b) system MTF graph; (c) system field curvature and distortion; (d) system matrix point map

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Fig. 4. System optomechanical structure

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Fig. 5. Filter wheel module. (a) Wheel signal interface; (b) BNC input and output trigger

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Fig. 6. Interface board circuit diagram and sliding mount

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Fig. 7. General flow chart of system software

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Fig. 8. UV polarization imaging detection system

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Fig. 9. Non-uniformity correction image. (a) Non-uniformity correction original image; (b) non-uniformly corrected image

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Fig. 10. Surface latent fingerprint UV polarization image of metal lacquered board. (a) Color digital image; (b) 0° polarization pattern; (c) 60° polarization pattern; (d) 120° polarization pattern; (e) Q figure; (f) P_DI diagram

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Table 1. Performance index of UV polarization imaging system

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Table 1. Performance index of UV polarization imaging system

Parameter	Value
Center wavelength /nm	254、280、340、365
Center wavelength deviation	±2
Half wavelength /nm	10±2
Clear aperture /mm	25.0
Transmittance /%	>75
Focal length /mm	78
Switching time /s	<0.5
Image resolution	2048×2040
System volume /(cm×cm×cm)	56×24×17
System power consumption /W	66

Table 2. Wheel indicator
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Table 2. Wheel indicator
Parameter Value
Current /A 2.08
Voltage /V 12.6
Frequency /Hz 47-63
Baud rate /(kbit·s^-1) 115.2
Data bit 8
Precision /(°) ±2
Switching time /s <0.5

Table 3. Image evaluation index result

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Table 3. Image evaluation index result

Parameter	I figure	Q figure	U figure	D_LP figure	A_P figure	P_DI figure	E_x figure	E_y figure	(E_x-E_y) figure
Information entropy	6.637	6.653	6.650	6.371	6.51	6.610	6.732	6.4772	6.518
Standard deviation	1.480	1.475	0.790	0.766	0.8955	1.584	0.847	1.3857	1.083
Contrast	16.713	17.163	2.016	7.830	5.458	12.76	2.449	11.376	15.93
Signal-to-noise ratio	6.769	8.100	1.757	1.997	2.564	3.3276	5.603	6.465	5.656

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Jia Rong, Wang Feng, Liu Xiao. Design and Experiment of Time-sharing Ultraviolet Polarization Imaging Detection System[J]. Laser & Optoelectronics Progress, 2020, 57(2): 21105

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