Method to Measure Phase Retardation of Wave Plate Based on Photoelastic Modulation 基于光弹调制技术的波片相位延迟量测量方法
This device is composed of grating plate, four cantilevers and address electrode, the phase modulation of incident light is performed for achieving the switching of light via piston-type motion of suspending grating, therefore, the grating light modulator array can be used for projection displays. 器件主要由3个部分组成:光栅、4个悬臂梁和地址电极。悬空的光栅活塞式运动可对光进行相位调制以实现光的开关态,器件阵列可用于投影显示;
Measurement of Deformation Direction of Object by Auxiliary Plate Micro-angle-displacement Modulation Holographic Method 辅助干版微角位移调制全息法测机械变形方向
When in the serpentine movement, the wheelset plate strain is the overlap of several modulation signals. Analyzing the time-frequency characteristic of wheel plate under different conditions help to filter or reduce noise interference through using reasonable method of signal processing according to the time-frequency characteristic. 分析车轮辐板在不同工况下的时频特性,有助于了解辐板应变信号的构成,根据信号的时频特性采用合适的信号处理方法滤除或减小噪声干扰。
When in the pure rolling, the wheelset plate strain is single frequency harmonic signal, and becomes modulation signal when it is added by track spectrum excitation. 轮对辐板应变在纯滚动时为单频谐波信号,加轨道谱激振后变为调制信号,轮对蛇行时成为几个调制信号的叠加。