An active speed measurement method and speed measurement device based on modulated laser

Abstract

The present invention discloses a method and device of active speed measurement on the basis of a modulated laser. The speed of a bullet is obtained through a secondary intensity modulation technology of a modulated laser screen, and the inhibition of various interferences such as vibration, impact, firelight and the like is realized; and modulated target-passing signals are demodulated through adoption of a coherent demodulation method, the interferences are effectively inhibited, the signal-noise ratio is increased, and the detection recognition capability is improved. According to the device of active speed measurement on the basis of the modulated laser, the photoelectric detection of laser scattering light by using a target at a high speed through adoption of a pair of light curtains, and speed measurement is realized without a light reflection cooperative target; and moreover, the device of active speed measurement on the basis of the modulated laser is simple in structure and easy to operate.

Description

technical field [0001] The invention relates to the field of photoelectric detection of the velocity of moving objects (including projectiles, fragments, etc.), in particular to an active speed measurement method and a speed measurement device based on modulated laser. Background technique [0002] The speed of high-speed targets such as projectiles and fragments is an important indicator in weapon systems. At present, the area intercept velocity measurement method is widely used at home and abroad, including on-off target, coil target, acoustic target, sky curtain target, LED light curtain target, laser light curtain target and so on. Among them, the laser light curtain target adopts laser light source, single wavelength, concentrated energy, strong directionality, and good beam shaping quality, which makes the method have outstanding characteristics such as high sensitivity, high test accuracy, strong anti-interference ability, and reliable indoor and outdoor work. , can ...

AI Technical Summary

Problems solved by technology

However, due to the use of static (non-modulated) light curtain receiving and detection technology, the existing laser light curtain speed measurement technology has limited ability to suppress external interference factors such as vibration and fire, and cannot effectively extract target passing signals submerged in vibration and fire. , and whether the current laser light curtain speed measuring device adopts a frame structure or a split structure, it needs to cooperate with the reflection cooperation target, the structure is complex, the adjustment of the optical path is cumbersome, and it is inconvenient to use (especially in the field test occasions)

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