SU473155A1 - Method for measuring the duration of short video pulses - Google Patents

Description

one

This invention relates to radio electronics and can be used in radio metering technology.

A known method for measuring the duration of short video pulses is based on the time scale conversion of an optical pulse by the dispersion method, the subsequent displacement of the converted optical signal with the emission of an auxiliary optical range generator, the frequency of which varies linearly, and the dispersive transformation of the displacement product.

The disadvantage of this method is the low resolution in duration.

The purpose of the invention is to increase the resolution in duration to the sub-second range.

This goal is achieved because the input electric signal using an optical deflector located in the focus of the optical system, deflects a beam of a highly directional monochromatic radiation source so that it passes through a slit optical aperture, causing a short optical pulse at its output corresponding to the front and driving the front of the input impulse, which feeds the dispersion line of the optical range to the input.

The frequency of the auxiliary optical range generator is changed at a rate equal to the rate of change of the frequency of the signals at the output of the dispersing line of the optical range, and the dispersing line is chosen from the condition of maximally producing its bandwidth by the square root from the product of its duration by the derivative of the frequency delay.

The essence of the method is as follows.

The input electrical signal modulates the intensity of monochromatic optical radiation in such a way that

the moment the input voltage reaches the set level, a short optical pulse is obtained. Next, two such imiuls, corresponding to the front and rear edges of the input pulse, are fed to the input

a dispersing delay line of the optical range, the output pulses of which are greatly extended in time and having a linear frequency modulation, are mixed with monochromatic radiation from an auxiliary optical range generator, whose frequency, starting from a certain specific moment, is changed linearly. The rate of change of frequency is set equal to the rate of change of frequency in the output signal of the optical line. Received by

As a result of mixing, the microwave signal is fed to the input of the dispersing microwave delay line, at the output of which microwave pulses are obtained. The interval between these pulses is permeated by the duration of the input signal of the video pulse at a given level. These pulses are detected and the interval between them is measured using a nanosecond time interval meter.

Subject invention

Claims (2)

1. A method of measuring the duration of short video pulses, based on converting the time scale of an optical pulse using a dispersive method of converting an optical signal, followed by mixing the converted optical signal with the radiation of an auxiliary optical frequency generator, whose frequency varies linearly, and dispersive transformation of the mixing product, characterized in that, in order to increase the resolution in duration to the subnanosecond range, the input electric signal using an electro-optical deflector located in the focus of the optical system, deflects the beam of the highly directional monochromatic radiation source and causes it to pass through the slit optical diaphragm and cause short output at the output optical pulses corresponding to the leading and trailing edges of the input pulse, which are fed to the input of the dispersing optical line about range. 2. A method according to claim 1, characterized in that the frequency of the auxiliary optical range generator is changed at a rate equal to the rate of change of the frequency of the signals on the output of the dispersing line of the optical range, and the dispersing line is selected from the condition of maximally producing its bandwidth by the square root of its duration na derivative delay but frequency.