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频率调制多普勒全场测速技术是一种基于分子滤波和多普勒频移现象的流场速度测量方法,在高速、超高速及大尺度风洞流场测量方面潜力巨大.我们设计开发了采用CCD相机作为接收探头的FM-DGV实验系统,该系统主要包括激光器、片光光学系统、碘分子滤波器、图像采集相机、频率监测单元等.基于该系统进行了谐波幅值比和转盘线速度测试实验.实验结果表明,该实验系统工作正常,速度测量误差最大值小于2m/s.
Frequency Modulation Doppler velocity measurement is a flow field velocity measurement method based on molecular filtering and Doppler shift, which has great potential in the field of high-speed, ultra-high-speed and large-scale wind tunnel flow field measurement. The CCD-based FM-DGV experimental system which is used as a receiving probe consists of a laser, a chip optical system, an iodine molecular filter, an image acquisition camera, a frequency monitoring unit, etc. Based on the system, harmonic amplitude ratio and turntable The linear velocity experiment is carried out.The experimental results show that the experimental system works normally and the maximum velocity error is less than 2m / s.