Measurement of high-speed flyer using F-P cavity interferometer

In order to measure the velocity history of the reflected surface or the internal particles velocity history of the materials under shock wave conditions,on the basis of the frequency-selecting principle of F-P optical resonator,a new type of velocity interferometer is developed,which makes use of the absolute magnitude of Doppler shift to continuously measure the moving of a flyer speed.The flyer is driven by a electric exploding foil,the magnitude of its speed can reach up to 3km/s within 60ns.Preliminary results show that the uncertainty in data is less than 5%.Compared with other laser interferometers,the lately developed thin cavity interferometer is compact,simple and low cost.So it can be widely used in the detonation and shock wave physics experimental research.