Laser Doppler velocimeter for middle and long distance velocity measurement

Abstract

The invention relates to a laser Doppler velocimeter for middle and long distance velocity measurement. After the laser Doppler velocimeter determines component parameters of an optical module according to detection requirements, the beam waist position of measuring light output by the optical module is adjusted by adjusting the distance between a positive lens group and a negative lens group in the optical module; an optical signal formed by interference of reference light and signallight is converted into a current signal containing Doppler frequency information, the current signal is processed through a signal processing system, so that the speed of a object to be measured is obtained, and middle and long distance speed measurement is achieved. With the laser Doppler velocimeter provided by the invention adopted, the problem of short measurement distance of a current velocimeter can be solved, and high precision and high signal-to-noise ratio of a measurement result can be ensured in middle and long distance measurement.

Description

technical field [0001] The present application relates to the technical field of laser Doppler velocity measurement, in particular to a laser Doppler velocity measuring instrument for medium and long-distance velocity measurement. Background technique [0002] Since its birth, laser Doppler technology has made great progress in theoretical research, optical structure design, and measurement dimensions. It can be widely used in the measurement of solid surface and fluid velocity. The technology has the characteristics of non-contact measurement, high precision, and large measurement range, which makes it have broad application prospects in scientific research, industrial production and other fields. It can be seen that laser Doppler speed measurement technology has great potential to solve the above high-precision, high-signal-to-noise ratio long-distance speed measurement needs. [0003] Since the development of laser Doppler technology, many companies have developed relati...

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Problems solved by technology

[0003] Since the development of laser Doppler technology, many companies have developed relatively mature products, among which the well-known ones are the mini LDV series of the American MSE company, the μSPEED-SMART&SMART-ECO LDV of the German Elovis company, and the FlexLDA system series of the Danish Dantec Dynamics company. etc., but when these products are in use, the distance between the measurement system and the moving object to be measured is limited to within 10m, and usually this distance is fixed and cannot be flexibly adjusted to meet the long-distance speed measurement requirements of changing working distances

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