摘要
设计了一个半导体激光自混频干涉式测量物体振动速度的实验,利用双镜F_P(法布里_珀罗)等效模型,对半导体激光自混频干涉速度仪中的干涉效应进行了理论分析,推导了干涉信号理论模型的数学表达式,讨论了影响测量信号的因素。结果表明,在半导体激光自混频干涉速度仪的无源腔中空气密度的变化、无源腔长度的变化、激光波长的变化都将会导致信号漂移,从而引起测量误差。而被测物体表面的反射率越高,越有利于测量。
The experimentation was designed on the Doppler velocity measurement with the self-mixing interference in a diode laser. By use of an equivalent to two-mirror cavity F-P（Fabry-Perot） model, the theoretical analysis about the self-mixing interference effect was made, and a mathematics expression of the theories model for an interference signal was deduced. The some factors of influencing measures the signal were discussed. These results show that the excursion of the measures signal lies on the change of following factors： the density n of the air in the passive cavity, the length H of the passive cavity, and the wavelength λ of the laser. The higher reflectivity is on the surface of the object, the more remunerative it is to measure.
出处
《光学技术》
EI
CAS
CSCD
北大核心
2006年第1期124-125,128,共3页
Optical Technique
