Study on time-varying velocity measurement with self-mixing laser diode based on Discrete Chirp-Fourier Transform
Lasers optical output power and frequency are modulated when the optical beam is back-scattered into the active cavity of the laser. By signal processing, the Doppler frequency can be acquired, and the targets velocity can be calculated. Based on these properties, an interferometry velocity sensor can be designed. When target move in time-varying velocity mode, it is difficult to extract the targets velocity. Time-varying velocity measurement by self-mixing laser diode is explored. A mathematics model was proposed for the time-varying velocity (invariable acceleration) measurement by self-mixing laser diode. Based on this model, a Discrete ChirpFourier Transform (DCFT) method was applied, DCFT is analogous to DFT. We show that when the signal length N is prime, the magnitudes of all the side lobes are 1 , whereas the magnitudes of the main lobe is -√n , And the coordinates of the main lobe shows the targets velocity and acceleration information. The simulation results prove the validity of the algorithm even in the situation of low SNR when N is prime.
Velocity measurement interferometry laser diode Self-mixing
ZHANG Zhao-yun GAO Yang ZHAO Xing-hai ZHAO Xiang
Institute of Electronic Engineering, China Academy of Engineering Physics, Mianyang 621900,China Dep Institute of Electronic Engineering, China Academy of Engineering Physics, Mianyang 621900,China Ke Institute of Electronic Engineering, China Academy of Engineering Physics, Mianyang 621900,China
国际会议
3rd International Photonics & OptoElectronics Meetings(第三届国际光子与光电子学会议 POEM 2010)
武汉
英文
1-6
2010-11-03(万方平台首次上网日期,不代表论文的发表时间)