RU1688740C - Device for control over sensitivity of photomultiplier tube - Google Patents

Abstract

The invention relates to electronic equipment and can be used, in particular, with an integrated method for measuring parameters of radiation pulses in an automatic mode. The purpose of the invention is to increase the accuracy of photo-detection of pulsed signals. An additional key is introduced into the device, a shunt interdiode gap and an increase in the switching speed of the photoelectronic multiplier due to the relative position of the connection points of the specified key

Description

The invention relates to electronic equipment and can be used, in particular, with an integrated method for measuring parameters of radiation pulses in an automatic mode.

The purpose of the invention is to improve the accuracy of photo-detection of pulsed light signals.

The drawing shows a circuit diagram of a device for controlling the sensitivity of a PMT.

The device comprises a high voltage power supply 1 of type SBPK20; type 2 connector HMO 660.042, serving as a terminal for connecting power supply 1; connector 3 type CP - 75-4-13; connector 4 of type SR-75-155 FV of the analog output signal; two connectors 5 of type CP-75-155 FV for connecting a cable of delay type P-5-75-4-13; voltage divider 7, photomultiplier tube (PMT) 8 SNFT-3; an electronic key 9 on an avalanche transistor of type 2G312B, the first output of which 10 is connected to the output 11 of the divider 7, an additional electronic key 12, the first output of which 13 is connected to the midpoint (output) 14 and the divider 7, the semiconductor optical emitter 15 and the photoconverter 16, amounted to those that have a single serial assembly - an OUTOZB type optocoupler, the first resistor 17 of the MLT-0.5-1.2 kΩ ± 20% -V type; the second resistor 18 type MLT-0.5-30 kOhm ± 20% -V; resistor 19 type MLT-0.5-11 kΩ ± 20% -V, the second additional resistor 20 type MLT-0.5-1.2 kOhm ± 20% -V: third additional resistor 21 type MLT-0.5-11 kΩ ± 20% -V; resistors 22 of type MLT-1.0-240 kOhm ± 10% -V, 23 types of MLT-1.0-240 kOhm ± 10% -V, 24 types of MLT-1.0-240 kOhm - 10% -V; which are increased in comparison with the standard resistors of the divider 7 by 18 kOhm, 18 kOhm and 11 kom, respectively, to compensate for device leaks and are selected so as not to disturb the normal operation of the PMT 8; resistor 25 type MLT-0.5-270 kOhm - 10% -V. also increased in comparison with the standard one, resistor 26 of the MLT-0.5- 75 Ohm type - 10% -V and a resistor of 27 type MLT-0.5-1 MΩ ± 10% -V, which is also increased compared to the standard one, the second capacitor 28 type K21-8a-M150-4.7n ± 20% -V, the third capacitor 29 type K21-8e-M 150-7 ± 20% -V, the first capacitor 30 type K21-8e-M 150-22n ± 20% - B. capacitor 31 of type K15-5-H50-6.3 kV-220 pf ± 10%, fifth capacitor 32 of type K15 -5-H50-6.3 kV-220 pf ± 10% gondechsagorzZ type K15-5-H501

1.6kV-680pf ± 10% and capacitor H K15-5-N50-3 kV-15n ±

The device operates as follows.

In the initial state, the keys 9 and 1 are closed, the capacitors 29, 30 are charged with the potential difference of their points in / u b; PMT sensitivity 8 max.

After the arrival of the starting pulse (s; PMT 8 through the cable 6 of the game delay, the role of the signal inverter or from the VI5P source) to / 1, yuchi 9 and 12 work for hours. spacing between the corresponding i

5 outputs of the divider 7. The synchronization of keys 9 and 12 is ensured by the appropriate selection of the values of pe and pa 21, as well as the fact that after working the key 9 sharply increases by

0 between the outputs of the divider 7 adjacent to the shunted mgs terrible mgs; that UGK is the activation of key 12 in the case of it:; bumps. The discharge current pulse, poking along key 9, causes a candle.

5 of the emitter 15 and then the electric converter 16 Ih is triggered, the voltage available on the capacitor is released on the resistor 18 and is sheltered through the separation capacitor p to the PMT dynode, creating a brake in the area between the dynodes. As a result, v. PMT 8 decreases sharply. the turn-off front is determined by the livestock of the keys 9 and 12, and the long-term i-switched state, in the main by maintaining the values of the resistor. capacitor 29. Capacitor 28 v t. turning off the PMT 8 eliminates the current transducer of the emitter 15 and increases,, its luminescence by time,. mine to operate the photoelectric converter 16. Capacitors .3 30 are a passive integrator of the signal and isolating capacitances respectively. Resistors 17 and 20 -j-ui are the operating point of the transistors of the keys 0 and, respectively. Resistor 19 orpani i - - key start current 9. Resistor 21 oi p.-. i sets the trigger current of key 12 and one mh

0 sets the required threshold avg; b. i vani. The resistor 26 agrees in,} the resistance of the cable 6 with the input cot p of keys 9 and 12. After the capacitors 29, 30 are oko-discharge, start charging them from source 1 and the device at a time determined by the corresponding 5 (| constant charge, comes into the state.

0

5

0

5

And | P

5

H, - nj where, for example, it was developed and tested if, if I had a simple model of a device for controlling PMTs.

L rn specifications:

- the amplitude of the starting pulse from 15 to 300 V;

- the trigger frequency of the pulse is positive;

Duration of the trigger pulse - but N fjnoe 10 nsec;

the control range of the sensibly sensitive memory is at least 105;

off-state duration - 5SE µs:

Off-front - 10 ns.

0

In the automatic measurement mode of the charge of the generated radiation pulse, for example, provided that the duration of the measured pulse is 10 nsec; the non-informative component of the signal is equal in amplitude to the informative, immediately follows it and has a duration of 100 nsec. the component of the error due to the presence of the non-informative part of the signal will be equal to: without suppressing the non-informative part of the signal 1000%, with the suppression of the non-informative part of the signal 1%.

G

(56) Copyright certificate of the USSR No. 1595268, cl. H 01 J 43/30, 1987.

Claims (1)

The claims DEVICE FOR CONTROL OF A CHUVSTPITTLNOGO.YO ELECTRONIC MULTIPLIERTER by ed. St. N 1595268 characterized in that, in order to increase the accuracy of photo-detection of impulse signals, an additional electronic switch, a second and third additional resistors and a fourth capacitor are inserted into it, the first output of the additional electronic switch being connected to the connection point of the second f 29 p nineteen semiconductor capacitor optical emitter and the corresponding midpoint of the voltage divider, and through the second additional resistor with its input, which is connected through the fourth capacitor and the third additional resistor to the input of the electronic key, the second output of the additional electronic key is connected to the connection point of the photoconverter, the third resistor and the corresponding the midpoint of the load divider. . 12,