Research on Doppler frequency in incoherent FM/CW laser detection

Kai Liu; Zhanzhong Cui

doi:10.1117/12.863721

11 October 2010 Research on Doppler frequency in incoherent FM/CW laser detection

Kai Liu, Zhanzhong Cui

Proceedings Volume 7656, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment; 765618 (2010) https://doi.org/10.1117/12.863721
Event: 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies, 2010, Dalian, China

Abstract

The principle of transmitted and received laser in incoherent FM/CW laser detection is different from the one in coherent FM/CW laser detection. The methods for distance solution in both detections are similar. Incoherent FM/CW laser detection uses subcarrier to modulate the intensity of laser, and the photodetector detects the intensity of received signal. The amplified photocurrent is mixed with local oscillator signal, and the intermediate frequency (IF) signal contains the information of distance from sensor to target. The Doppler frequency for this detection is related with the relative radial velocity between sensor and target. The optical frequency is directly modulated with electro-optic device in coherent FM/CW laser detection and the received laser signal is photomixed with transmitted laser signal. The Doppler frequency in the detection relates to the optical frequency. In distance-measuring lidar, the Doppler frequency affects the solution. The Doppler frequency in incoherent FM/CW laser detection is unrelated with optical frequency, and it is much less than the one in coherent FM/CW laser detection, correspondingly. The error in incoherent FM/CW laser detection is smaller. As a result, the incoherent FM/CW laser detection is more suitable for the use of distance-measuring lidar.

Citation Download Citation

Kai Liu and Zhanzhong Cui "Research on Doppler frequency in incoherent FM/CW laser detection", Proc. SPIE 7656, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 765618 (11 October 2010); https://doi.org/10.1117/12.863721

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KEYWORDS

Doppler effect

Modulation

Signal detection

Sensors

LIDAR

Target detection

Laser optics

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