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A method for adjusting the gain of electron multiplier

An electron multiplier and gain adjustment technology, applied in the field of mass spectrometer detectors, can solve the problems of inconvenient operation, low efficiency and complexity, and achieve the effects of saving time, high efficiency and simple operation

Active Publication Date: 2017-02-08
FOCUSED PHOTONICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adjusting the gain by this method has the following disadvantages: To obtain an electron flow of known intensity requires a relatively complicated device, and at the same time the electron multiplier needs to be taken out of the mass spectrometer for external testing, which is inconvenient to operate and low in efficiency

Method used

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  • A method for adjusting the gain of electron multiplier

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Embodiment 1

[0031] A gain adjustment method, comprising the steps of:

[0032] Load an initial voltage V on the electron multiplier 初1 , according to the step size ΔV 1 Adjust the voltage loaded on the electron multiplier. At each voltage, record the shot noise signal generated on the electron multiplier. With the change of the voltage loaded on the electron multiplier, for the first time, the signal greater than the preset first The voltage applied to the electron multiplier corresponding to a threshold signal is the first voltage, and the voltage applied to the electron multiplier corresponding to the signal greater than the preset second threshold obtained for the first time is the second voltage, according to the first The first voltage and the second voltage obtain a target voltage corresponding to the best gain, and load the target voltage value on the electron multiplier to adjust the gain to the best.

[0033] The magnitude of the target voltage is between the first voltage and ...

Embodiment 2

[0053] This embodiment is an application example of Embodiment 1.

[0054] This embodiment provides a method for adjusting the gain of an electron multiplier, which is applied to a gas chromatography-mass spectrometer, comprising the following steps:

[0055] see figure 1 , a gain adjustment method, comprising the following steps:

[0056] Load an initial voltage V on the electron multiplier 初1 =-1000V, according to the step size ΔV 1 =-100V increases the voltage loaded on the electron multiplier. At each voltage, record the shot noise signal generated on the electron multiplier. The voltage applied to the electron multiplier corresponding to the first threshold signal is set as the first voltage, and the voltage applied to the electron multiplier corresponding to the signal greater than the preset second threshold obtained for the first time is the second voltage, according to The first voltage and the second voltage obtain a target voltage corresponding to the best gain,...

Embodiment 3

[0063] This embodiment provides a gain adjustment method, which is different from the gain adjustment method in Embodiment 2 in that:

[0064] The initial voltage V applied when adjusting the gain in this embodiment 初1 =-1600V, step size ΔV 1 =100V. Specifically adjust the gain according to the following steps:

[0065] Load an initial voltage V on the electron multiplier 初1 =-1600V, according to the step size ΔV 1 =100V reduces the voltage loaded on the electron multiplier. At each voltage, record the shot noise signal generated on the electron multiplier. With the reduction of the voltage loaded on the electron multiplier, the first time obtained is greater than the preset The voltage applied to the electron multiplier corresponding to the signal of the first threshold value is the first voltage, and the voltage applied to the electron multiplier corresponding to the signal greater than the preset second threshold obtained for the first time is the second voltage, accord...

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Abstract

The invention relates to a method for adjusting the gain of an electron multiplier. The method for adjusting the gain of the electron multiplier comprises the steps that the electron multiplier is loaded with an initial voltage V<initial 1>, the voltages loaded onto the electron multiplier are adjusted according to a step length delta V<1>, the signal of shot noise generated on the electron multiplier at each voltage is recorded, along with changes of the voltages loaded onto the electron multiplier, the voltage, loaded onto the electron multiplier, corresponding to the signal, obtained for the first time, larger than a preset first threshold value is the first voltage, the voltage, loaded onto the electron multiplier, corresponding to the signal, obtained for the first time, larger than a preset second threshold value is the second voltage, the target voltage corresponding to the optimum gain is obtained according to the first voltage and the second voltage, the target voltage value is loaded onto the electron multiplier, and the gain is adjusted to the optimal value. The method for adjusting the gain of the electron multiplier has the advantages of being high in efficiency, low in cost, convenient and fast to execute and the like, and operation is easy to carry out.

Description

technical field [0001] The invention relates to a method for adjusting the gain of an electron multiplier, which is mainly used in a mass spectrometer detector. Background technique [0002] Mass spectrometers generally use electron multipliers as detectors to amplify the ion current signal emitted from the ion trap analyzer. Usually, the gain of the electron multiplier is controlled at 10 5 , but as the use time increases or some other state changes, the gain of the electron multiplier will change. At this time, it is necessary to adjust the gain by adjusting the high voltage loaded on the electron multiplier so that the gain remains at 10 5 Left and right, so as to ensure the stability of the mass spectrometry signal intensity. Currently, there are mainly two methods for adjusting the gain: [0003] 1. Standard gas method [0004] A certain concentration of standard gas is introduced into the vacuum cavity of the mass spectrometer, and the response value of the standar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J43/30
CPCH01J43/30
Inventor 段炼刘立鹏刘盈智马乔
Owner FOCUSED PHOTONICS