TeraHertz wave Doppler interferometry instrument and method

Abstract

The invention relates to the field of testing, in particular to a TeraHertz wave Doppler interferometry instrument and method to solve the problems of the prior art. The instrument comprises a reference light adjusting device, a target detecting device and a data processing device. Interference signals processed by a THz wave beam splitter are filtered through a THz filter, and the filtered interference signals are detected through a THz wave detector; then signals output by the THz wave detector are recorded through an oscilloscope, and finally data acquired by the oscilloscope are analyzed and processed through a processor, so that the movement distance and speed of a target relative to an interferometer are obtained. The wavelength of the TeraHertz wave is larger than dust grains, and therefore dust penetrability is high. The wavelength of the TeraHertz wave is smaller than that of microwaves, so that displacement resolution is high. Furthermore, interference fringe frequency is low, and the bandwidth of a required probe and oscilloscope can be effectively reduced.

Description

technical field [0001] The invention relates to the testing field, in particular to a terahertz wave Doppler interferometer and a method. Background technique [0002] The velocity, acceleration and bottom pressure of the shell in the bore are the key parameters in the design of the artillery and shell launch system, which are of great significance for the development of internal ballistic theory, the research of new artillery and light weapons, and the calibration of weapons. The main experimental techniques for determining the ballistic parameters of the projectile when it moves continuously in the bore include microwave interferometry and laser interferometry. Microwave interference technology is limited by the wavelength of the microwave itself (centimeter level or millimeter level). When the velocity of the measured projectile is small, such as the movement of the projectile in the extrusion section, due to the low velocity of the projectile, the movement distance is sm...

AI Technical Summary

Problems solved by technology

However, laser interferometry technology is susceptible to the influence of smoke and dust in the gun barrel, and often loses displacement information due to the occlusion of smoke and dust in the middle of the projectile movement.

Moreover, this technology uses infrared (1550nm) laser or visible light as the light source, and the frequency of the interference signal is high (for example, the interference signal with a speed of 2km / s requires an oscilloscope bandwidth ≥ 2.6GHz), which has high requirements for the bandwidth and sampling rate of the oscilloscope.

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