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为进一步提高激光多普勒测振仪(LDV)的测量分辨率,实现物体表面微小振动的测量,设计了一种以双频环形激光器作为光源的LDV,介绍了该系统的光源及光路结构,推导了测振原理,并通过实验验证了该系统的可行性和准确性。在该系统中,利用四频差动激光陀螺频差稳定和谱线窄的优点,将四频差动激光陀螺改进为双频环形激光器,产生两束具有一定夹角和固定频差的线偏振光,结合光栅技术可实现对物体表面横向微小振动的测量。与其他LDV相比,该系统光路简单且分辨率较高,在实验室环境下振幅分辨率最大噪声不超过0.012μm?Hz1 2。
In order to further improve the measurement resolution of laser Doppler Vibration Meter (LDV) and realize the measurement of tiny vibration on the surface of the object, an LDV with dual frequency ring laser as light source was designed. The light source and optical path structure of the system were introduced. The principle of vibration measurement is deduced, and the feasibility and accuracy of the system are verified through experiments. In this system, the quadrupole differential laser gyro is modified into a dual-frequency ring laser by using the advantages of stable frequency difference and narrow spectrum of the quad-band differential laser gyro, and two linearly polarized lights with a certain angle and a fixed frequency difference are generated. Combined with grating technology can be achieved on the surface of the small horizontal vibration measurement. Compared with other LDVs, the system has a simple optical path and high resolution. The maximum amplitude resolution noise in laboratory environment does not exceed 0.012μm? Hz1 2.