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Neutron detector low current amplification device and method capable of achieving background compensation

A neutron detector and small current technology, applied in the field of neutron signal measurement in nuclear reactors, can solve problems such as inability to eliminate, and achieve the effect of eliminating the influence of current

Inactive Publication Date: 2014-06-11
NUCLEAR POWER INSTITUTE OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the output current is below 10 -8 A, the influence is still obvious, and the measuring instruments currently used cannot eliminate this influence

Method used

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  • Neutron detector low current amplification device and method capable of achieving background compensation

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Embodiment Construction

[0022] The following combination figure 1 and Examples further describe the present invention.

[0023] Such as figure 1 Shown in the present invention is a neutron detector small current amplification device capable of background compensation, including a self-powered neutron detector 1, an armored signal cable 2, a signal lead wire 3, and a shielded cable 4; The signal current transformation and amplification module 5 and the compensation current transformation and amplification module 6 that convert the current signal into a voltage signal; also include a "subtraction" processing module 7 for obtaining the amplitude subtraction signal of the two voltage signals and the voltage Amplitude adjustment module 8 for adjusting signal amplitude;

[0024] The neutron detector 1 comprises a collector housing 103, an emitter 101 arranged in the collector housing 103, an insulator 102 between the collector housing 103 and the emitter 101;

[0025] The armored signal cable 2 includes...

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Abstract

The invention relates to a neutron detector low current amplification device capable of achieving background compensation. The neutron detector low current amplification device comprises a self-powered neutron detector, an armored signal cable and a shielding cable and further comprises a signal current conversion amplification module used for converting current signals into voltage signals and a compensating current conversion amplification module. The neutron detector low current amplification device further comprises a subtraction processing module used for obtaining two amplitude subtracting signals of two voltage signals and an amplitude adjustment module for adjusting the voltage signal amplitude. The invention further relates to a neutron detector low current amplification method capable of achieving background compensation. The method includes the steps of collecting current signals of an emitter and current signals of a background core wire, converting the current signals into voltage signals, performing amplitude subtracting on the voltage signals, and finally obtaining final voltage signals corresponding to neutron flux. According to the neutron detector low current amplification device and method capable of achieving background compensation, the influence, generated by gamma ray irradiation, on currents is eliminated; accurate wide-range measurement of neutron currents of the self-powered neutron detector can be achieved; in the neutron detector low current amplification device and method capable of achieving background compensation, the accurate measurement range of neutron currents can reach 10-11 A to 10-5 A.

Description

technical field [0001] The invention relates to the field of nuclear reactor neutron signal measurement, in particular to a neutron detector small current amplification device and method capable of realizing background compensation. Background technique [0002] A core neutron measuring instrument is usually installed in a nuclear reactor to measure the core neutron flux. The signals obtained from the multi-point measurement are used to monitor the three-dimensional power distribution calculation of the core; the single-point measurement of the neutron flux in the test tunnel is carried out in the reactor with the test tunnel to determine the neutron flux at a certain point in the test tunnel. [0003] Different reactor setups have different types of gauges. Existing neutron measuring instruments in the reactor include miniature movable fission chambers, activated pneumatic balls, activated metal wires, and self-powered detectors. Self-powered detectors are the more common...

Claims

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Application Information

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IPC IPC(8): G01T3/00
Inventor 吕渝川曾少立李文平朱宏亮高志宇李昆杨戴博
Owner NUCLEAR POWER INSTITUTE OF CHINA
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