SU1541481A1 - Stroboscopic analyzer of form of optical recurring signals - Google Patents

Abstract

The invention relates to the field of physics, photoelectronics, and measurement technology and can be used to study the kinetics of fast processes accompanied by optical radiation. The purpose of the invention, an increase in the accuracy of recording the shape of an optical repetitive signal with an increase in temporal resolution, is achieved by eliminating the "parasitic" photoemission signal of dynodes from two sequences of information signals obtained for each polling point of the optical signal under investigation. The device contains a scanning unit 1, a delay line 2, a gating pulse generator 3, an electronic switch 4, a locking pulse generator 5, a photoelectric multiplier 7 photocurrent modulator, a frequency divider 8, a switch 9, a memory register 10, a subtractor 11, a block 12 processing and registration. Due to the introduction of the electronic key 4, the frequency divider 8, the switch 9, the memory register 10 and the subtractor 11, the elimination of the "parasitic" signal from the information signal supplied to the processing and recording unit 12 is achieved. This provides an increase in the accuracy of recording the shape of the optical repetitive signal. 2 Il.

Description

The invention relates to physics, photoelectronics, and measurement technology, and can be used to study the kinetics and fast processes accompanied by optical radiation.

The purpose of the invention is to increase the accuracy of recording the shape of an optical repetitive signal while increasing the temporal resolution by eliminating the parasitic photoemission signal of the diodes from two sequences of information signals obtained for each polling point of the optical signal under investigation.

Figure 1 presents the block diagram of the analyzer; figure 2 - the timing diagram of the main blocks.

The analyzer consists of a block of 1 sweeps, a delay line 2, a strobe pulse generator 3, an electronic key 4, a lock pulse generator 5, a photocurrent modulator 6, a photomultiplier tube PMT multiplier 7, a frequency divider 8, a switch 9, a memory register 10, a subtractor 11 and block 12 processing and registration.

In the stroboscopic analyzer

OPTICAL REPEATED FORMTS SI1-

A PMT 7 circuit with an external modulator of the photocurrent 6 is connected to the outputs of the locking generators 5 and the gating 3 electrical pulses. The output of block 1. sweeps is connected to the input of the generator 5 locking pulses, which generates ICs synchronously with the pulses of the scanner block. The output of the scanner unit 1 is connected to the input of the frequency divider 8 and the electronic switch 4 input. The output of the frequency divider 8 is connected to the control input of the electronic switch 4, the information input of which receives the signal of the scanner unit 1.

The output of the electronic key 4 through the line 2 delays connected to the input of the generator 3 gate pulses

The output of the PMT 7 is connected to the input of the switch 9, the control input of which is connected to the output of the frequency divider 8. A memory register 10, the input of which is connected to the second output of the switch 9, is connected to the subtraction unit 11. Switch 9 is the first output connected to the first input of subtracting unit 11, the second input of which

connected to memory register 10. The output of the subtraction unit is connected to the information input of the processing and recording unit 12, the control input of which receives a signal from the output of the scanning unit 1.

Thus, the generator of 3 gating pulses generates electric signals only when the electronic key 4 is enabled, which occurs during positive half-periods of signals from the output of frequency divider 8.

5 The analyzer operates as follows.

To the input of the unit 1 sweep serves start-up pulses. The output pulses of the sweep unit are fed to the generator 5 of the locking pulses, from the output of which the pulses are fed to the modulator 6 of the PMT 7.

At the same time, the scanning pulses 5 are fed to an electronic switch 4, which controls the operation of the generator 3 of gating pulses, the output signal of which is fed to the Lottoka modulator 6.

0 The output signal from the sweep unit 1 is also fed to the frequency divider 8, where the control signal of the electronic key is normalized 4. The effect of the control signal is

This key will include

and turn off the generator 3 strobe pulses with the frequency of the output signal of the 8 frequency divider.

To the input of the PMT 7 through the hole

In modulator 6, a repetitive optical signal is supplied, which is converted into an electronic signal of the photocathode. This signal is affected by pulses of locking and gating, and thus,

that the locking pulses affect the first and second half-periods, and gating pulses - only in the first half-period of the signal of the frequency divider.

As a result, in the first half-periods, the photoelectric signal of the photomultiplier is gated and at its output a sequence of stroboscopic cuts of the photomultiplier signal is obtained, which, when passing through the dynodes, adds a parasitic dynode photoemission signal due to the optical signal on the FPU dynodes.

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The ro second half-periods do not affect the photoelectric signal of the photomultiplier by gating pulses, and only the parasitic signal of the diode system appears at the output of the photomultiplier.

Received two sequences of signals contain spurious signals. Switch 9 divides them and sends the first one to memory register 10, and the second to one of the inputs of subtraction unit 11, the second input of which receives a signal from memory register 10.

The operation of the switch 9 controls the output signal of the frequency divider 8. As a result of optical signal transformations using a photomultiplier with an external modulating photocurrent electrode, a sequence of electrical signals is received at the input of the switch 9 (FIG. 2, figure 6). The signal from frequency divider 8 controls the operation of the switch. In the first half period of the frequency divider 8 signal (logical 1), the switch 9 sends the signal to memory register 10 (the first three pulses in diagram 6, Fig. 2). In the second half-period of the signal of the frequency divider (logical O), the switch sends the next three pulses to one of the inputs of the subtractor I1, on the other input of which the signal from the memory register is located.

Since all the indicated pulses (diagram 6, figure 2) were obtained for the same polling point, as a result of subtraction in block 11, a sequence of pulses without a parasitic component is obtained at the output. As a result of the signal subtraction in the subtraction unit 11, the parasitic signal is excluded, and in the processing and recording unit 12 by 541481

Steps signal strobe without distortion.

Thus, a stroboscopic analyzer of the shape of optical repetitive signals makes it possible to increase the recording accuracy.

Claims (1)

Formula invented and. A stroboscopic analyzer of optical repetitive signal shape, consisting of a scanner unit with a triggering input, the output of which connected to the control input of the processing and recording unit and the input of the generator of the locking pulses, the output of which is connected to the first input of the photocurrent modulator of the photoelectric multiplier, the second input of which is connected to the output of the gating pulse generator, the input of which is connected to the output of the delay line, characterized in that, in order to increase the accuracy of recording the shape of the optical repetitive signal with increasing temporal resolution, an electronic key is added to it, divider frequency, switch, memory register and subtractor, the output of which is connected to the information input of the processing and recording unit, the first input is connected to the first output of the switch, and the second input is connected to the output of the memory register whose input is connected to the second output of the switch, information input which is connected to the output of the photomultiplier, and the control input is connected to the control input of the electronic switch and the output of the frequency divider, the input of which is connected to the output of the scanner unit, to which connected information entry elek tronnogo key, the output of which is connected to the input of the delay line. i  A Sh one SHSh eight 6 FIG. 2 mm. one