Self-mixing interferometer based on temporal-carrier phase-shifting technique for micro-displacement reconstruction

A novel self-mixing interferometer based on temporal-carrier phase-shifting technique is presented. The phase of the laser beam is modulated with a triangular wave by an electro-optic modulator (EOM) in the external cavity. Phase demodulation of the interference signal is achieved by five-step Schwider-Hariharan algorithm combined with a special sampling technique. Theoretical analysis and simulation results are presented. Some errors of the technique have been discussed. Experimentally, the new interferometer is applied to measure the displacement of a high precision commercial PZT and a displacement measurement accuracy of λ/60 can be obtained.     

相移干涉仪中探测器非线性误差及其补偿

通过对多个相移算法的理论分析和数值模拟,发现探测器的非线性响应在相位中会引入2倍空间频率的系统误差。结果表明,非标准相移算法随着探测器非线性度的增加,相对误差也越来越大。提出了压电陶瓷驱动器的移相误差和光电探测器的非线性误差相互抵消的误差补偿技术,并给出了判别误差匹配有效性的实用判据。仿真表明,这种误差补偿技术可以使测量误差减小约一个量级。证明了在不考虑波前幅度信息时,标准相移算法对光电探测器的非线性为零响应,不影响仪器精度。     

压电性材料在电场中形变的观察与研究

用改进后的迈克耳孙干涉仪测量在低频低压及直流恒压下具有压电性的物质(铌酸锂材料,即蜂鸣器)上各点的形变量随电压的变化关系,由此得到每伏特电压形变在样品上的分布.     

高速转镜干涉成像光谱仪

介绍一种高速转镜干涉光谱仪原理，提出一种基于该原理的干涉成像光谱仪，该成像光谱仪有较大视场角，提高了扫描效率，特点是用带有倾角平面反射镜转动代替传统Michelson干涉成像光谱仪动镜的直线运动，解决了Michelson干涉成像光谱仪扫描效率低和不稳定的难题.     

Measurement of shock waves using phase shifting pulsed holographic interferometer

A phase shifting pulsed holographic interferometer was applied to the experimental study of the propagation of laser-induced shock waves over metal plates. A double-pulsed ruby laser was used to generate the shock waves and to make a holographic interferogram of the wave fields. The phase shifting method with a dual-reference beam solved the sign ambiguity problem in holographic fringe patterns and allowed a quantitative evaluation of the phase of the interference patterns. The transient surface profile and propagation behavior of the shock wave over plates were investigated from the holographic fringe patterns.     

The new circular heterodyne interferometer with electro-optic modulation for measurement of the optical linear birefringence

We present a new circular heterodyne interferometer with electro-optic modulation for measurement of the optical linear birefringence. It enables the measurement of not only the phase retardation but also the principal angle. The measurement procedure is carried out in two steps. In the first step of measurements, we use the electro-optic modulated circular heterodyne interferometer and the phase-lock technique to precisely measure the principal axis angle. After rotating the analyzer in the setup, the phase retardation is determined also by the phase-lock technique. The compact configuration requires only a photodetector and two simple phase-lock extractions to determine the principal axis angle and the phase retardation. The validity of the proposed design is demonstrated by measurement of the principal axis angle and phase retardation of a quarter-wave plate sample. The root-mean-square resolutions for the principal axis angle and phase retardation are found to be 0.0396° and 0.0796°, respectively, with corresponding dynamic ranges of 0–180° and 0–180°.     

克服光纤Mach-Zehnder干涉仪信号衰落的新方法及分析

为了克服光纤Mach-Zehnder干涉仪易受环境因素影响而引起偏置相位漂移从而导致输出信号衰落(波动)的问题,提出一种新的简单方法,即:将干涉仪输出信号分为直流和交流两个分量,通过直流分量的大小来计算交流信号的补偿因子,以达到克服交流信号衰落、稳定检测传感信号的目的在小信号测量情况下,该方法在很大范围内能有效抑制随机温度涨落等因素引起的信号衰落的问题文中对补偿方法的误差和局限性也做了分析和讨论.     

基于衍射光学器件的多自由度测量仿真研究

提出了基于衍射光学器件的单光束多自由度测量的新方法。描述了该方法的基本原理,建立了相应的激光干涉系统的数学模型,设计了一种能够产生多自由度测量信息的衍射光学器件。分析了干涉场光强信号特征与目标各平动和转动量之间的关系,给出了仿真计算结果。该方法原理简单,测量效率高,并能提供较高的测量分辨率和测量精度。     

薄透明体厚度及折射率的测量

本文介绍了测量薄透明体厚度及折射率的一种方法。     

马赫-曾德尔干涉仪消光比和单通道光开关

对马赫-曾德尔(M—Z)干涉仪的滤光消光比特性进行了研究，提出了一种在其一端加上光纤全反镜的方法，大大改善了马赫一曾德尔干涉仪的输出谱特性，由此提出并设计了一种单通道光开关，实验得到了约37．4dB的开关动态范围。