Pulse shape measuring device and measuring method thereof

Abstract

This invention relates to a measuring method and device of impulse form. The invention includes one constant proportion timing discriminate module and one time-to-digital conversion module. Data of time-to-digital conversion modular enter calculator for handling. Constant proportion timing discriminate module has a group of leading edge discriminator and a group of back edge discriminator, which separately discriminate a series of points where the ratio of pulse front edge and back edge voltage and spike voltage are certain worth corresponding time. multipass time-to-digital conversion module convert time interval between first time and subsequently time to digital quantity, adopt digital counting method and combine digital delay line bracketing method, realize at a piece of field programmable logic array FPGA. sending obtained data into computer for calculation to gain time interval, base on voltage peak ratio of every time to indirectly reduce impulse form, and obtain pulsewidth. The invention has low cost, small bulk, and light weight, can apply to laser range finder.

Description

technical field [0001] The invention relates to a laser pulse shape, in particular to a pulse shape measuring device and a measuring method. Background technique [0002] Laser rangefinders obtain distance information by measuring the flight time of laser pulses. At the same time, after the emitted laser pulse interacts with the target surface, the echo pulse will often be broadened or deformed due to the difference in target surface characteristics (such as roughness, inclination, etc.). Therefore, by obtaining the shape of the echo pulse, And the echo pulse width can be obtained from this, and the basic characteristics of the target can be obtained indirectly. [0003] In the laser altimeter system, the existing pulse shape measurement technology generally adopts A / D sampling circuit, and the working principle is shown in Figure 1. At a series of selected moments, the amplitude (voltage) of the input pulse is sampled, and the hold time enters after the sampling is over. ...

AI Technical Summary

Problems solved by technology

In addition, the high-speed A / D sampling circuit is often expensive and generates a lot of heat, and some need to add a fan and an independent power supply, so it is bulky, difficult to integrate, and heavy, which limits its application in laser altimeters

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