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

A laser modulation and active technology, applied in the direction of the device used to measure the time required to move a certain distance, can solve the problems of ineffective signal extraction, cumbersome optical path adjustment, limited suppression ability, etc., to facilitate spatial filtering and narrow-band filtering , improve the signal-to-noise ratio, simple structure effect

CN105319386BActive Publication Date: 2019-01-25ZHONGBEI UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2019-01-25

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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.
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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 ...

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Embodiment Construction

[0036] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0037] A kind of active speed measuring method based on modulated laser of the present invention, comprises the following steps:

[0038] Step 1. Generate a modulated laser signal whose light intensity changes with time, and control the laser to emit the modulated laser signal, thereby forming two parallel laser light curtains at the same time, serving as the start target I and stop target II for the velocity measurement of the projectile 3 respectively. Among them, the one-dimensional expanded beam laser source is driven by a sinusoidal modulation signal, changing the injection current of the semiconductor laser, so that the output light intensity of the laser changes with the change of the injection current, thereby forming a high-frequency modulated laser modulation signal, the signal is strong The expression over time is:

[0039] (Formula 1)

[0...