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Electron multiplier based detector

An electron multiplier and detector technology, applied in the field of detection, can solve the problems of harsh shielding requirements, weak current signals are susceptible to interference, and limit the response speed of the amplifier, so as to achieve the effect of improving the signal-to-noise ratio

Active Publication Date: 2015-07-01
WUHAN HAIWANG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the negative feedback part is a very high resistance resistor, sometimes it may exceed 10 12 ?, there is stray capacitance across it, which limits the response speed of the amplifier
In addition, when the detector is in a harsh environment such as high temperature, strong radiation, etc., the amplifying circuit in the detector that is not suitable for the environmental conditions must be kept away from the signal source, and weak current signals are usually susceptible to interference during long-distance transmission. Shielding requirements are more stringent

Method used

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Embodiment 1

[0024] like figure 1 , 2 As shown, this embodiment provides a detector based on an electron multiplier, including a detection unit 18 and its floating DC power supply U1, a hot cathode 15 and its floating power supply U2, and a signal amplification unit. The cathode 15 is connected, the floating DC power supply U1 is connected in parallel with the filter capacitor C1, the floating power supply U2 is connected in parallel with the filter capacitor C2, and the signal amplifying unit is composed of an accelerating field cathode plate 14, an electron multiplier 12, a charge collector 16, and a voltage divider power supply U3 , voltage divider resistors R1~R3, and capacitors C3~C5, the floating DC power supply U1 continuously pumps the electrons from the anode of the detection unit to the hot cathode, where the hot cathode is the cathode, and the free electrons generated by the hot cathode The electrons enter the electron multiplier through the accelerating electric field, and the...

Embodiment 2

[0037] In the first embodiment, the detecting unit of the detector, that is, the sensitive part, is separated from the signal amplifying unit. In this way, the protection of the weaker signal amplification part can be strengthened. For example: when detecting strong γ-rays, lead shielding can be covered around the signal amplification part; when detecting high-flux neutrons, neutron moderator absorbing materials can be covered around the signal amplification part.

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Abstract

The invention relates to the technical field of detection and provides an electron multiplier based detector. The electron multiplier based detector comprises a detection unit, a floating direct-current power supply U1 of the detection unit, a thermionic cathode, a floating power supply U2 of the thermionic cathode and a signal amplification unit, wherein the detection unit is connected with the thermionic cathode, the signal amplification unit consists of an accelerating field cathode plate, an electron multiplier, a charge collector electrode, a voltage divider power supply U3, a voltage divider resistor R1, a voltage divider resistor R2, a voltage divider resistor R3, a capacitor C3, a capacitor C4 and a capacitor C5, the floating direct-current power supply U1 constantly extracts electrons of an anode of the detection unit to the thermionic cathode, free electrons generated by the thermionic cathode are fed into the electron multiplier through an accelerating field, and amplified signal current reaches the charge collector electrode and then is output. The electron multiplier based detector can effectively amplify weak-current signals and is good in environmental adaption capacity.

Description

technical field [0001] The invention relates to the technical field of detection, in particular to a detector based on an electron multiplier. Background technique [0002] In micro-current signal detection, when the current is too weak to be measured directly, an amplifier is needed to amplify the signal. The traditional method is to convert the weak current signal into a voltage signal that can be directly measured by using an operational amplifier chip combined with a feedback resistor with a large resistance value. Since the negative feedback part is a very high resistance resistor, sometimes it may exceed 10 12 ?, there is stray capacitance across it, which limits the response speed of the amplifier. In addition, when the detector is in a harsh environment such as high temperature, strong radiation, etc., the amplifying circuit in the detector that is not suitable for the environmental conditions must be kept away from the signal source, and weak current signals are u...

Claims

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Application Information

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IPC IPC(8): G01R19/00
Inventor 任才陈祥磊龚玉巍邹涛孙光智代传波左亮周郭智荣
Owner WUHAN HAIWANG TECH