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Ionization current measurement device and measurement method

An ionization current and detection device technology, applied in the direction of measuring devices, measuring electrical variables, measuring current/voltage, etc., can solve the problem that the detection accuracy is difficult to meet the measurement accuracy, and achieve the effect of small leakage and high detection accuracy

Inactive Publication Date: 2015-08-26
NAT INST OF METROLOGY CHINA
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Problems solved by technology

However, the detection accuracy of the existing ionization current measuring instruments and measurement methods is difficult to meet the measurement accuracy requirements

Method used

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  • Ionization current measurement device and measurement method
  • Ionization current measurement device and measurement method

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Embodiment Construction

[0029] The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0030] figure 1 It is a schematic diagram of the detection device of ionization current of the present invention, as shown in the figure, the detection device of ionization current of the present invention includes: ionization chamber 1, electrometer 2, precision capacitor 3, timer 4, compensation voltage source 5 and voltmeter 6.

[0031] The ionization chamber 1 includes a high-voltage electrode 10 and a collector 11. When the radiation irradiates the ionization chamber, the air inside the ionization chamber is ionized. Since there is a voltage difference between the high-voltage electrode 10 and the collector 11, the ionized ion pairs flow to the high-voltage electrode 10 and the collector 11 respectively. Collector 11 moves, thereby generating the current to be measured. One end of the electrometer 2 is connected ...

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Abstract

The invention relates to an ionization current measurement device and a measurement method. The ionization current measurement device comprises an ionization chamber, an electrometer, a precision capacitor, a compensation voltage source and a voltmeter, wherein when the ionization chamber is illuminated by rays, air inside the ionization chamber is ionized, generated ionized charges are collected by a collecting electrode and thus to-be-measured current is formed; the electrometer is connected with the collecting electrode, the to-be-measured current charges the precision capacitor, and the electrometer measures the to-be-measured current value; one end of the precision capacitor is connected with the electrometer, and the to-be-measured current charges the precision capacitor; the timer is connected with the electrometer; one end of the compensation voltage source is connected with the other end of the precision capacitor and provides compensation voltage for the precision capacitor; and the voltmeter is connected with the compensation voltage source and the precision capacitor for measuring a voltage value of the precision capacitor. According to the ionization current measurement device and the measurement method, leakage quantity is small, and measurement precision is high.

Description

technical field [0001] The invention relates to a measuring device and a measuring method, in particular to a measuring device and a measuring method for ionization current. Background technique [0002] Because the magnitude of the ionization current is very small, only on the order of pA. However, the detection accuracy of existing ionization current measurement instruments and measurement methods is difficult to meet the measurement accuracy requirements. Contents of the invention [0003] The object of the present invention is to aim at the defects of the prior art, and provide a detection device and detection method for ionization current with small leakage and high detection accuracy. [0004] To achieve the above object, the invention provides a detection device for ionization current, the detection device for ionization current includes: [0005] The ionization chamber, including the high-voltage electrode and the collector electrode, when the radiation irradiate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00
Inventor 李德红王培玮邬蒙蒙黄建微成建波
Owner NAT INST OF METROLOGY CHINA
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