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High dynamic range MCP detector

A high dynamic range and detector technology, applied in dynamic spectrometers, parts of particle separator tubes, time-of-flight spectrometers, etc., can solve problems affecting signal detection, reducing the dynamic range of instruments, and complex samples to be analyzed. To achieve the effect of improving the dynamic range

Inactive Publication Date: 2019-06-04
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0003] However, in the practical application of TOFMS, since the samples to be analyzed are usually relatively complex, the contents of different components often have several orders of magnitude differences, resulting in large differences in the ion signals of different components
A strong ion signal will saturate the ion detector, affect the detection of the signal, and cause measurement errors for both strong and weak signals, reducing the dynamic range of the instrument

Method used

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Embodiment

[0027] Example: such as figure 1 Shown is a high dynamic range MCP detector of the present invention. When working, ions 1 are introduced from above the shielding electrode 3 and bombard the first piece of MCP to generate a large number of secondary electrons. Under the action of the electric field, the secondary electrons continue to bombard the surface of the MCP channel downward to generate more secondary electrons; the first piece of MCP The extracted electrons are accelerated and bombard the second MCP, similarly generating more electrons, which are finally received by the electron collecting electrode 8 and coupled and transmitted by the capacitor 9 . The two ends of the two MCPs are respectively connected to the output terminal 21 of the pulsed high-voltage power supply and the high-voltage power supply 22. The output of the pulsed high-voltage power supply 17 can be switched to HV1 and HV2 under a certain timing sequence 18, which can ensure that the gap between the tw...

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Abstract

The invention relates to a mass spectrometer instrument and particularly relates to a high dynamic range MCP detector for a time-of-flight mass spectrometer. The specific structure of the detector comprises a shielding electrode, two sets of MCP fixed electrodes, MCP sheets, an electron receiving electrode, a signal coupling capacitor, voltage divider resistors, a high-voltage pulse power supply,high-voltage power supplies, and a pulse timing generator. By introducing a pulsed high voltage of certain timing in the MCP detector, the voltage differences between two ends of the MCP sheets can beinstantaneously changed to obtain the tunability of a MCP detector gain in the controllable mass range, and therefore, the high dynamic range detection of the time-of-flight mass spectrometer is achieved.

Description

technical field [0001] The invention relates to a mass spectrometer analysis instrument, in particular to an instantaneous adjustable gain MCP detector for a time-of-flight mass spectrometer, which can realize high dynamic range detection of the time-of-flight mass spectrometer. Background technique [0002] Time-of-Flight Mass Spectrometer (TOFMS) has the characteristics of simple structure, fast analysis speed, high resolution and sensitivity, fast response speed of microsecond level and full mass range, etc. It is widely used in environmental detection, life science, etc. field has a wide range of applications. Usually the detector of TOFMS consists of a micro channel plate (MCP). MCP is a flat plate-shaped electron multiplier made of many special hollow glass fibers. The inner wall of each hollow fiber channel is coated with a material with a higher secondary electron emission coefficient. The inner diameter of the channel is between a few microns and tens of microns. ...

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Application Information

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IPC IPC(8): H01J49/40H01J49/02
Inventor 蒋吉春花磊王艳吴称心李海洋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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