A light energy stabilization control device for a phase laser ranging system

Abstract

The invention relates to a light-energy stable controller of phase type laser range finding system. The controller comprises a detector, a gain variable amplifier, a frequency mixing demodulation unit, a first filter, a second filter, a driving control unit, a gain control unit, a laser driving circuit and a laser, wherein the detector converts laser echo signals with optical power change and outputs electrical signals with optical power amplitude change; the gain variable amplifier is connected with the detector and outputs high-frequency electrical signals; the frequency mixing demodulation unit is connected with the gain variable amplifier and outputs intermediate-frequency signals; the first filter is connected with the frequency mixing demodulation unit and extracts low-frequency signals; the second filter is connected with the frequency mixing demodulation unit and extracts instant optical power change information; the driving control unit is connected with the first filter, and outputs laser optical power drift voltage; the gain control unit is connected with the second filter, and is used for automatic gain control for received optical power; the laser driving circuit is connected with the driving control unit, and outputs increased or decreased modulated laser emission power feedback signals; and the laser is connected with the laser driving circuit, and used for emitting modulated laser signals of automatic gain control.

Description

technical field [0001] The invention belongs to the technical field of automatic control, and relates to a control device for electric signal power after photoelectric conversion of a laser rangefinder, in particular to a light energy stabilization control device for a phase type laser rangefinder system. Background technique [0002] The laser range finder measures the relative distance of the target by measuring the round-trip time of the laser. In the short-range (tens of meters) measurement, its single measurement accuracy has reached the millimeter level. As an effective means to quickly obtain accurate distance information of targets, high-precision laser ranging has been widely used in fields such as non-contact measurement of industrial sites, laser three-dimensional scanning, and spacecraft rendezvous and docking. Laser range finders are generally used to measure non-cooperative targets. In short-range ranging applications, the laser echo power will change drastica...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the technical problem that the existing range finder has large amplitude and phase errors, and requires a long start-up stabilization time, which makes the start-up speed slow, the purpose of this invention is to reduce the amplitude and phase errors of the laser ranging system and shorten the start-up time. Stabilization time, for which a light energy stabilization control device for a phase laser ranging system is provided

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