CN205301596U - G -M count pipe sampling circuit - Google Patents

Abstract

The utility model discloses a sampling circuit of G -M count pipe, it is including count pipe U2 and singlechip U3, still put module U1 before count pipe high pressure, count pipe U2's positive pole and negative pole insert J+ and the J - of putting module U1 before the count pipe high pressure respectively and hold, it meets first electric capacity C1 to put before count pipe high pressure between module U1's VCC and the GND, it links to each other to put module U1's SO foot and singlechip U3's 25 feet before the count pipe high pressure, meet second electric capacity C2 between singlechip U3's 22 feet and the GND, singlechip U3's 22 feet and vcc's indirect resistance R1. The utility model has the advantages of it is following: small, low power dissipation, simple to use.

Description

A kind of G-M counter tube sample circuit

Technical field

This utility model belongs to nuclear radiation monitoring field, is specifically related to the application circuit of a kind of G-M counter tube.

Background technology

Current G-M counter tube measuring circuit adopts transformator, pulse-generating circuit and stabilivolt to realize the generation of high pressure, and the signal of counter tube output just can give single-chip microcomputer by follower, comparator, it is achieved nuclear signal collecting, power consumption is in 5mW magnitude, circuit power consumption is big, and components and parts are many, use complexity.

Utility model content

Technical problem to be solved in the utility model is just to provide the sample circuit of a kind of G-M counter tube, its power consumption compared with little, components and parts are few, it is simple to microminiaturized, it is simple to carry use.

Technical problem to be solved in the utility model is realized by such technical scheme, it includes counter tube U2 and single-chip microcomputer U3, also include amplification module U1 before counter tube high pressure, the anode of counter tube U2 and negative electrode are respectively connected to J+ and the J-end of amplification module U1, the V of amplification module U1 before counter tube high pressure before counter tube high pressure_CCWith the indirect first electric capacity C1 of GND, before counter tube high pressure, the SO foot of amplification module U1 is connected with 25 feet of single-chip microcomputer U3,22 feet of indirect second electric capacity C2, the single-chip microcomputer U3 of 22 feet of single-chip microcomputer U3 and GND and the indirect resistance R1 of Vcc.

Compared with prior art, before this utility model counter tube high pressure, amplification module U1 substituted for the high-tension circuit of resolution element composition, eliminates filtering shaping circuit, so this utility model has the advantage that volume is little, low in energy consumption, it is simple to use.

Accompanying drawing explanation

Accompanying drawing of the present utility model illustrates as follows:

Fig. 1 is circuit diagram of the present utility model;

In figure: amplification module before U1, counter tube high pressure; U2, counter tube; U3, single-chip microcomputer.

Detailed description of the invention

Below in conjunction with drawings and Examples, the utility model is described in further detail:

As it is shown in figure 1, this utility model includes counter tube U2 and single-chip microcomputer U3, also including amplification module U1 before counter tube high pressure, the anode of counter tube U2 and negative electrode are respectively connected to J+ and the J-end of amplification module U1, the V of amplification module U1 before counter tube high pressure before counter tube high pressure_CCWith the indirect first electric capacity C1 of GND, before counter tube high pressure, the SO foot of amplification module U1 is connected with 25 feet of single-chip microcomputer U3,22 feet of indirect second electric capacity C2, the single-chip microcomputer U3 of 22 feet of single-chip microcomputer U3 and GND and the indirect resistance R1 of Vcc.

Work process of the present utility model is: after the 3.3V power supply that supply is stable, before counter tube high pressure, amplification module U1 is to the counter tube U2 high pressure plus work, when counter tube U2 receives radiation signal, before counter tube high pressure, amplification module U1 collects pulse signal from counter tube U2 two ends, and the losing side wave impulse that this pulse signal is molded into width 20us is exported by SO foot, 25 feet of single-chip microcomputer U3 receive the pulse signal of SO foot output and count, and are realized the measurement of radiation dose rate by algorithm.

The capacitance of the first electric capacity C1 is minimum for 10uF, and the second electric capacity C2 capacitance is minimum for 1nF, and the resistance of resistance R1 is more than 100K ��, and before counter tube high pressure, the model of amplification module U1 is QD390(power consumption 33uW, size 22*14*5.5mm³), the model of single-chip microcomputer U3 is MSP430FR5739.

Claims (1)

1. the sample circuit of a G-M counter tube, including counter tube U2 and single-chip microcomputer U3, the model of U3 is MSP430FR5739, it is characterized in that: also include amplification module U1 before counter tube high pressure, the model of U1 is QD390, the anode of counter tube U2 and negative electrode are respectively connected to J+ and the J-end of amplification module U1, the V of amplification module U1 before counter tube high pressure before counter tube high pressure_CCWith the indirect first electric capacity C1 of GND, before counter tube high pressure, the SO foot of amplification module U1 is connected with 25 feet of single-chip microcomputer U3,22 feet of indirect second electric capacity C2, the single-chip microcomputer U3 of 22 feet of single-chip microcomputer U3 and GND and the indirect resistance R1 of Vcc.