Study on the High Speed Measurement of Laser Diode Self-mizing Velocimeter
Laser self-mixing interferometry is a new method proposed for measuring velocity of a moving target. When the optical beam is back-scattered into the active cavity,laser output power and frequency are modulated. By signal processing,the Doppler frequency can be acquired,and the targets velocity can be calculated. Based on these properties,a low-cost interferometry velocity sensor can be designed. In order to know whether the Laser Diode (LD) Self Mixing (SM) velocimeter is suitable for high speed (km/s) scene,the high speed measurement by LDSM is analyzed in theory and the simulation is processed. Based on the three-mirror cavity model,relations of the laser output powers frequency fluctuations and Doppler frequency are acquired. External optical feedback is regarded as lasers small-signal modulation by the Doppler frequency. From rate equations of the carrier density and the photon density,following conclusions is acquired: LDSM velocimeter s maximum measurable velocity (MMV) is restricted by lasers relaxation resonant frequency in principle;LDSM velocimeters MMV goes up to kilometers per second theoretically;When the LDs modulation speed satisfies request,LDSM interferometry can be used to measure high speed and the measurement precision is very high. The result is available to use the self-mixing technique to develop high performance,small overall dimensions and low cast instruments to measure high speed.
Velocity measurement interferometry laser diode Self-mizing.
Zhaoyun Zhang Yang Gao Xinghai Zhao Xiang Zhao
Institute of Electronic Engineering,China Academy of Engineering Physics,Mianyang 621900,China Depar Institute of Electronic Engineering,China Academy of Engineering Physics,Mianyang 621900,China Key L Institute of Electronic Engineering,China Academy of Engineering Physics,Mianyang 621900,China
国际会议
2009 9th International Conference on Electronic Measurement & Instruments(第九届电子测量与仪器国际会议 ICEMI2009)
北京
英文
1821-1824
2009-08-16（万方平台首次上网日期，不代表论文的发表时间）