Opt Lett. 2018 Jul 1;43(13):3120-3123. doi: 10.1364/OL.43.003120.
A multiaxis heterodyne interferometer concept is under development for observations of 5 deg of dynamic freedom using a single illumination source. This Letter presents a laboratory system that combines elements of heterodyne Doppler vibrometry, holography, and digital image correlation to simultaneously quantify in-plane translation, out-of-plane rotation, and out-of-plane displacement. The sensor concept observes a dynamic object by mixing a single optical field with heterodyne reference beams and collecting these combined fields at the image and Fourier planes, simultaneously. Polarization and frequency multiplexing are applied to separate two segments of a receive Mach-Zehnder interferometer. Different optical configurations are utilized; one segment produces a focused image of the optical field scattered off the object while the other segment produces an optical Fourier transform of the optical field scattered off the object. Utilizing the amplitude and phase from each plane allows quantification of multiple components of transient motion using a single, orthogonal beam.
正在开发一种多轴外差干涉仪概念，以便使用单个照明源对 5 度的动态自由度进行观测。本信介绍了一个实验室系统，该系统结合了外差多普勒测振术、全息术和数字图像相关技术的元素，可同时定量测量平面内平移、离面旋转和离面位移。传感器概念通过将单个光学场与外差参考光束混合，并在图像和傅立叶平面同时收集这些组合场来观察动态物体。偏振和频率复用被应用于分离接收马赫-曾德尔干涉仪的两个部分。利用不同的光学配置，一个部分产生物体散射的光学场的聚焦图像，而另一个部分产生物体散射的光学场的光学傅里叶变换。利用每个平面的幅度和相位，可以使用单个正交光束对瞬态运动的多个分量进行定量。
