Laser interference speed measurement device and method with remeasurement function

Abstract

The invention discloses a laser interference velocity measurement device and method with a remeasurement function, the device integrates two laser interference velocity measurement systems working at different wavelengths together by adopting a wavelength division multiplexing technology, the velocity of the same measurement point is remeasured, and the two laser interference velocity measurement systems are completely independent, so that the speed of the same measurement point is remeasured. When the laser or the oscilloscope of any system works abnormally in the experiment, the other system is not affected to obtain the speed measurement signal normally, so that the reliability of the speed measurement device during working is improved.

Description

technical field [0001] The invention relates to the technical field of laser interference speed measurement, in particular to a laser interference speed measurement device and method with retesting function. Background technique [0002] In the experimental research of shock wave physics and detonation physics, the material to be tested will move at high speed under extreme loading conditions such as high temperature and high pressure, and its motion characteristics are not only related to the characteristics of the material, but also closely related to the loading process. Therefore, in shock wave physics In the experimental research of detonation and detonation physics, velocity measurement technology has become one of the most important testing methods. After decades of development, laser interferometric velocimetry technologies such as VISAR, DISAR, PDV, and MPDV based on the optical Doppler effect have become standard testing techniques in the experimental research of s...

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Problems solved by technology

Although VISAR, DISAR, PDV, MPDV and other laser interferometric speed measurement technologies have been developed very maturely, they still have the following obvious shortcomings: (1) Affected by factors such as temperature, humidity, and complex electromagnetic environment, when performing laser speed measurement, use The laser will not emit light, the interference signal recording oscilloscope will have a black screen and other abnormal working phenomena, resulting in the loss of a large number of measurement point data and increasing the risk of dynamic experiment failure; (2) The dynamic reflective characteristics of the material to be tested are unknown, and the During the process, the angle will also undergo a certain degree of random deflection, resulting in a certain degree of randomness in the dynamic amplitude of the interference signal. If the sensitivity setting of the signal acquisition oscilloscope is not appropriate, the over-screen phenomenon will occur, resulting in the loss of effective signals, or the signal amplitude (3) Even under the action of a stable shock wave, some materials to be tested may have slight oscillations in the velocity profile. Due to the lack of velocity re-measurement technology at the same position, it is impossible to distinguish whether these oscillations are due to the characteristics of the material itself. The decision is still caused by the speed measurement system being disturbed by environmental electromagnetic interference.

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