Method for inhibiting background of deep space X-ray detection spectrometer
A technology of background suppression and X-ray spectroscopy, applied in the field of deep space exploration, can solve the problems of difficulty in distinguishing effective signals, deviation of acquisition results, and inability to be acquired, and achieve flexible channel control, reduce count rate, and suppress electrical signals. effect of noise
Inactive Publication Date: 2009-11-25
INST OF HIGH ENERGY PHYSICS CHINESE ACADEMY OF SCI
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However, various charged particles permeating the universe will also enter the system from the same input channel as the signal input, and be collected by the circuit to form noise
Not only that, noise interference will also enter the system from non-signal channels, damaging the effective signal so that it cannot be collected, or the collection result is biased, or even mistaken for a valid signal and collected, which makes it difficult to distinguish valid signals
The background interference of X-ray spectrometers for deep space exploration is complex in the space environment, and the signal-to-noise ratio of useful signals is low. It is urgent to solve this technical problem
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[0023] The background suppressing method of the deep-space X-ray spectrometer of the present invention includes three parts. Firstly, a collimator with a magnetic field distribution is designed in the incident window of the instrument to prevent the noise signal from entering. The structure of the collimator can be designed as a barrel or a square barrel according to actual needs. In the present invention, the collimator is designed as a cuboid in the shape of a square barrel. The usual collimator is a single metal material. In order to better shield space charged particles and secondary particles, the present invention is designed as a four-layer composite structure, which is carbon fiber, rubidium iron boron, soft iron, aluminum from the inside to the outside. material layer. In the application, more structural layers can be used according to the actual effect. Because there are soft iron and NdFeB materials in the collimator, a magnetic field with a certain strength and un...
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Abstract
The invention provides a background inhibiting method applied to a deep space X-ray detection spectrometer, and relates to anti-radiation technology of deep space detection. The method comprises the following steps: (A) using a collimator with distribution of an intensity magnetic field to reduce radiation background; (B) using an amplitude analysis anti-coincidence method to alleviate the noise pollution and reduce the counting rate; and (C) applying multi-channel isolation technology to close a high-noise signal channel and reduce the total noise of the spectrometer. The method comprehensively utilizes the collimator with the magnetic field to shield background particles and utilizes the amplitude analysis anti-coincidence and the multi-channel isolation technology to inhibit the background of the spectrometer.
Description
technical field [0001] The invention relates to the technical field of deep space detection, and relates to a background suppression method of an X-ray spectrometer for deep space detection. In a deep space environment, when the X-ray spectrometer system processes nuclear physics signals with low signal-to-noise ratio, various A method to extract weak signals by suppressing the background. Background technique [0002] The deep space X-ray spectrometer is an instrument dedicated to deep space X-ray detection. A space X-ray detection instrument is usually composed of collimator, detector (sensor), amplifier, AD converter, processor and other human-computer interaction components. When X-ray photons enter the sensitive area of the detector through the collimator, corresponding current / voltage will be generated, and the data will be collected and displayed through amplification. However, various charged particles permeating the universe will also enter the system from the s...
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Inventor 梁晓华汪锦州王焕玉张承模杨家卫曹学蕾张家宇崔兴柱彭文溪陈勇高旻
Owner INST OF HIGH ENERGY PHYSICS CHINESE ACADEMY OF SCI