Large dynamic weak current detection device for radiation detection

Abstract

The invention discloses a weak current detection device for radiation detection, which is used for detecting large dynamic weak current and requires recording and displaying measured data in real time. The device comprises a DC power module, a weak current amplifying and I / V switching circuit, an A / D conversion circuit, a central control unit, a range selection switching circuit and a user terminal, wherein the central control unit is used for finishing the functions of data processing, range switching and data communication; and the range selection switching circuit realizes automatic range selection by selecting a feedback channel of a feedback network. The weak current detection device realizes automatic range switching, adopts a T-shaped resistance network structure in a feedback network of the weak current amplification and an I / V switching circuit U2, improves the equivalent resistance of the feedback network and avoids the temperature drift and capacitive reactance influence brought by high impedance generally. Therefore, the technical problems that the conventional weak signal measurement equipment has low range, slow response, low resolution, and the like, so that the precision reaches 0.1pA or below and the resolution is 10fA.

Description

technical field [0001] The invention relates to a weak current detection device for radiation detection, in particular to a measuring device for detecting large dynamic weak current and requiring real-time recording and display of measurement data. Background technique [0002] Radiation detection is to record the number of nuclear radiation particles (including γ radiation, neutron radiation, α and β radiation, etc.), identify the types of particles, measure its fluence rate and determine the energy distribution of nuclear radiation. With the continuous deepening of nuclear physics and particle physics experimental research and the continuous improvement of detector sensitivity, the voltage and current signals output by detectors are often very weak, and the weak current signals are even below the picoampere level. This kind of micro-current signal cannot be measured by ordinary ammeter, especially in the calibration of the sensitivity and dark current of detectors such as ...

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a large dynamic weak current detection device for radiation detection that can measure and display in real time, can measure a large dynamic current from 0.1 picoamp to 2.5 milliampere, and can automatically select a range. Signal measurement equipment has technical problems such as small range, slow response, and low resolution

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