用于面形测量的光纤投影器相移和频移特性  

Phase-shifting and frequency-shifting characteristic of fiber optic projector for the shape measurement

作　　者：林晓艳[1,2] 朱荣刚[2] 李滨品 苑立波[2] 

机构地区：[1]上海应用技术学院数理教学部,上海200235 [2]哈尔滨工程大学,哈尔滨150001 [3]上海工具厂有限公司,上海200093

出　　处：《光学技术》2009年第1期25-27,共3页Optical Technique

基　　金：哈尔滨工程大学基础研究基金资助项目(HEUF404);教育部高等学校优秀青年教师教学科研奖励计划资助项目

摘　　要：提出了一种光纤投影器产生相移和频移的方法,给出了光纤投影器相移和频移特性的理论与实验相一致的结果。光纤投影器利用双光束干涉产生正弦调制的结构光场,通过在一路光中引入压电陶瓷PZT,调节PZT的驱动电压来改变双光纤中光波的光程差,从而使干涉条纹产生相移,得到相移随驱动电压的变化曲线;频移是采用移动光纤投影器到接收屏距离的方法来改变干涉光场的空间频率,给出了变频条纹的傅里叶频谱,得到干涉光场的相对空间频率,将其与理论值相比较,给出二者之间的线性关系曲线,从而证明了干涉光场相对空间频率与投影器到接收屏距离成反比的关系。A phase shift and frequency shift method of duN-optical fiber projector is presented. The characteristic of phase shift and frequency shift are studied in the theory and experiment. The theory results are agreement with the experiment. Piezoelectric ceramic PZT is used for phase shifter. Optical path difference is changed through adjusting PZT＇s drive voltage to realize interference fringes moving. Then the relation of the phase shift vs. driving voltage of PZT is given. For the frequency shift method, the distance between the projector and the receiving screen is adjusted to change the space frequency of the fringes. The relative space frequency of the interference fringes are gained by fast Fourier transform, thus relation curve is given between the theory and experiment. The result shows that relative space frequency is inversely proportional to the distance between the projector and the receiving screen.

关 键 词：三维测量 光纤投影器 干涉 频移特性 相移特性 

分 类 号：TH706[机械工程—仪器科学与技术]