Mechanism of multi-wavelength laser detection of micro-camera

QU Jiahui; ZHANG Haiyang; FAN Yu; WANG Lin; WANG Heying; ZHAO Changming

doi:10.5768/JAO202243.0407004

Journal of Applied Optics > 2022 > 43(4): 809-818. > DOI: 10.5768/JAO202243.0407004

QU Jiahui, ZHANG Haiyang, FAN Yu, WANG Lin, WANG Heying, ZHAO Changming. Mechanism of multi-wavelength laser detection of micro-camera[J]. Journal of Applied Optics, 2022, 43(4): 809-818. DOI: 10.5768/JAO202243.0407004

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Mechanism of multi-wavelength laser detection of micro-camera

QU Jiahui^{1, 2,},
ZHANG Haiyang^{1, 2, ,},
FAN Yu³,
WANG Lin^{1, 2},
WANG Heying^{1, 2},
ZHAO Changming^{1, 2}

1.
Key Laboratory of Photoelectronic Imaging Technology and System (Ministry of Education), Beijing Institute of Technology, Beijing 100081, China
2.
School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China
3.
Key Laboratory of Optoelectronic Countermeasure Testing and Evaluation Technology, Luoyang 471003, China

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Received Date: April 14, 2022
Revised Date: June 01, 2022
Available Online: June 12, 2022

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Abstract

Abstract

Based on the detection and transmission characteristics of different wavelength bands of lasers, by analyzing the echo transmission characteristics of typical micro-cameras, a research scheme for multi-wavelength laser feature detection of micro-camera was proposed. The theories of geometric optics and wave optics were used to analyze the structure of the micro-camera and its reflection spectral characteristics, and the echo light field at a certain detection distance was calculated and simulated. On this basis, a multi-wavelength laser detection system was built. The experimental results show that within a certain depth of field, the micro-camera with infrared cut-off filter has the obvious echo spot diffraction ring characteristics for visible light, high fringe contrast and long detectable distance; in the near-infrared band, the target echo power is low, the back-scattering interference is serious, and the detectable distance is short; the short-wave infrared band is hardly affected by the infrared cut-off filter, and 1 550 nm is in the eye-safe band. The experimental results are consistent with the numerical analyses and theoretical simulation results, which indicate the feasibility of short-wave infrared laser detection of micro-camera.
- multi-wavelength detection,
- micro-camera,
- cat-eye effect,
- echo characteristics

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References

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Mechanism of multi-wavelength laser detection of micro-camera