Dual Wavelength All-Fiber Laser Interferometric Velocity Retest Technique

Based on the wavelength division multiplexing technology and the traditional optical path structure design of laser velocity interferometer, a dual wavelength laser velocity interferometer which has the retest function is proposed. The basic principle and optical path structure design of this dual wavelength laser velocity interferometer are briefly introduced. The dynamic examination experiment of low speed and high speed are carried out on gas guns, and the velocities of the same measuring point are simultaneous measured by this method with one single probe.The experimental results show that the deviation of the two wavelengths velocity measurement is within 1.5%.