SU635400A1 - Pulse duration measuring method - Google Patents

Description

one

The invention relates to the field of measurement technology and can be used for creating instruments for measuring the duration of single and periodic pulses of small duration and large amplitude, for example, laser light pulses.

Known methods. pulse duration measurements based on photographing the measured pulses using an oscilloscope.

These methods have a number of disadvantages: large measurement errors due to the use of oscillographic screen photography.

The closest to the invention of the technical essence is a method for measuring the pulse duration, with the axis, which spleen the optical signal into an electrical signal, form two signals from it.

This method is labor intensive, requires complex means of implementation, and is characterized by low accuracy.

The purpose of the invention is to simplify the measurement process and improve accuracy.

This goal is achieved by the fact that both signals are converted into excisional from odiakov1) 1 constant c) and drop, form two rectangular nmuns from these signals and determine the duration of the measured pulse from the difference in their durations.

FIG. 1 shows a block diagram of the device that implements the proposed method; in fig. 2 are timing diagrams, where, on the axis of the ordinates, the corresponding amplitude values of the studied signals, shown in FIG. I have corresponding blocks.

The device contains a photodetector 1, a two-channel electric system of a linear transform with formers and mode intervals.

The first channel consists of a peak detector 2 and a threshold device 3, the second one - from an integrator 4 and a similar threshold device 5.

Through the scheme, both channels extracted 6 time slots: 1 in 1 with an indicator device 7, which can be, for example, a digital time interval meter. The output signal of the subtraction circuit, but equal to the duration of aa b 1-d tt, / 2 - time of passage of signals

through the level

o-f /.( /,)- i /. (a

which is fixed by threshold devices, gives information about the duration of the measured impulse.

The signal from the photodetector 1 is divided into two channels, and it should be emphasized that both signals passing through the peak detector 2 1 and integrator 4 are converted into signals proportional to the amplitude and energy of the original signal, respectively.

 The figures shown make it easy to understand the essence of the proposed method and how it is implemented.

The proposed method is simple and reliable.

Claims (2)

1.Valitov R.A. et al. “Measuring the Characteristics of Optical Quantum Generators, ed. Committee of Standards, Measures and Measuring Instruments under the USSR Council of Ministers, M. 1969, p. 150-152. 2.Mr. M.I. “Measurement of impulse voltages, M.,“ Soviet Radio, 1969, p. 42-60.