Journal of Applied Optics, Volume. 43, Issue 4, 809(2022)
Mechanism of multi-wavelength laser detection of micro-camera
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.
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Jiahui QU, Haiyang ZHANG, Yu FAN, Lin WANG, Heying WANG, Changming ZHAO. Mechanism of multi-wavelength laser detection of micro-camera[J]. Journal of Applied Optics, 2022, 43(4): 809
Category: LASER TECHNOLOGY
Received: Apr. 15, 2022
Accepted: --
Published Online: Aug. 8, 2022
The Author Email: ZHANG Haiyang (ocean@bit.edu.com)