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30 October 2009 Dual-wavelength technology used in anti-interference for long-range and short-distance detection
Haojun Zhang, Jianlin Zhao
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Proceedings Volume 7498, MIPPR 2009: Remote Sensing and GIS Data Processing and Other Applications; 74984I (2009)
Event: Sixth International Symposium on Multispectral Image Processing and Pattern Recognition, 2009, Yichang, China
Technology of interference becomes more advancing. Adopting fog and aerosols is the best way to interfere optical detection. Due to the fog and aerosols, target recognition becomes difficult under this environment. In the present paper a method is given to solve this problem in a simple way. A dual-wavelength technology used in anti-interfere for long range and short distance detection is introduced in this paper, which can discriminate the backscattering reflection of fog and aerosols. In the present work the scattering character of the special fog and aerosols environment is calculated using the Rayleigh scattering method and Mie scattering method. The scattering characters in different environment are analyses using two wavelengths, i.e. one wavelength lies in ultraviolet wave band, the other in near infrared wave band. The results indicated that the ratio of proportion-discrimination is usually greater than 2, and deeper the strength of the fog and aerosols, the greater the ratio. This method also validated by experiment. In the present study, three kinds of wavelength such as 405nm, 670nm and 808nm are adopted. The intensity data collected shows that the ratio is greater than 3. The performance and working principle of the system and its components are analyzed in details. Based on the full system, the dual-wavelength technology can be well applied. The result of the experiments also proves that the technology is efficient, especially in the heavy fog and aerosols environment. The dual wavelength method can be used for long range and short distance detection.
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Haojun Zhang and Jianlin Zhao "Dual-wavelength technology used in anti-interference for long-range and short-distance detection", Proc. SPIE 7498, MIPPR 2009: Remote Sensing and GIS Data Processing and Other Applications, 74984I (30 October 2009);

Light scattering

Laser scattering


Fiber optic gyroscopes

Rayleigh scattering


Mie scattering

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