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Pulse signal synchronization integration measurement apparatus and method resisting random noise

A technology of signal integration and random noise, applied in the field of mass spectrometry, can solve problems such as asynchrony and achieve the effect of stable charge

Inactive Publication Date: 2016-10-26
NORTHWEST INST OF NUCLEAR TECH
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  • Abstract
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Problems solved by technology

Although this method allows the measurement of strong ion currents, but also because of its asynchronous nature, random noise is indiscriminately included in the measurement results

Method used

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  • Pulse signal synchronization integration measurement apparatus and method resisting random noise
  • Pulse signal synchronization integration measurement apparatus and method resisting random noise
  • Pulse signal synchronization integration measurement apparatus and method resisting random noise

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Embodiment Construction

[0059] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0060] The anti-random noise synchronous pulse signal integral measuring device of the present invention comprises a constant charge reverse charging integration circuit and a synchronous gating data acquisition circuit, and the constant charge reverse charging integration circuit includes an integration circuit and a reverse charging circuit, wherein the constant charge reverse charging circuit The charging circuit is triggered by the level, and is used to limit the output voltage of the integrating circuit within its linear range; the data acquisition circuit is a gated data acquisition circuit, and the gated data acquisition circuit collects data at the data moment, and to process.

[0061] Picture 1-1 It is the schematic diagram of the integral circuit. The cascade connection of the first operational amplifier A1 and the second operational amplifier A2 in the in...

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Abstract

The invention brings forward a pulse signal synchronization integration measurement apparatus and method resisting random noise, for realizing pulse signal intensity measurement which has a synchronization feature and may has a high pulse pile-up probability. The content mainly comprises a fixed charge reverse charging integration circuit and a synchronization gated data acquisition circuit, and a measurement method for reducing and deducting random noise pulses. The fixed charge reverse charging integration circuit comprises an integration circuit and a fixed charge reverse charging circuit, wherein the integration circuit is used for charging a capacitor and converting intensity information of detected pulse signals into voltage amplitude information; and the fixed charge reserve charging circuit triggered by level is used for limiting output voltages of the integration circuit within a linear scope, and reverse charging pulses can be delayed so as to avoid influences on data acquisition. In terms of the measurement method, the intensity of random noise signals is measured by use of a time-sharing measurement method, the random noise pulses are further deducted in a data processing process.

Description

technical field [0001] The invention relates to the field of mass spectrometry, and is specifically aimed at the measurement of ion signals with synchronous characteristics generated by a pulsed ion source, and is an anti-random noise pulse signal integration measurement method. Background technique [0002] In a mass spectrometry system that uses a secondary electron multiplier as an ion detector, the current method for measuring the output pulse signal of the detector generally uses an asynchronous discrimination-counting method. Due to its asynchronous characteristics, this method is more suitable for the measurement of continuous ion current signals. In a mass spectrometry system using a pulsed ion source, the ion signal is generated according to a certain period, and its duration is shorter than the system repetition period. For example, in a mass spectrometry system using a laser pulsed ion source, the ion signal only lasts for 2 to 5 μs within a 100 μs repetition peri...

Claims

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Application Information

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IPC IPC(8): G01R29/02
CPCG01R29/02
Inventor 李志明何资星翟利华邓虎韦冠一徐江李静雅
Owner NORTHWEST INST OF NUCLEAR TECH
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