Flat plate real time imaging gas detector based on FET switch array

Abstract

The invention relates to a flat-plate real-time image-forming gas detector based on FET switch array, which belongs to the radiation imaging field. The detector comprises a closed air chamber (1), a drift electrode (2), a GEM film (3), a FET switch array (12), a data-acquisition system (8) and the like, wherein the drift electrode (2) and the GEM film (3) are both arranged in the closed air chamber (1), negative high pressure is applied on the upper surfaces and the lower surfaces of the drift electrode (2) and the GEM film (3) through a high-pressure divider resistance string (7) in turn, and the electric potential difference between the upper surface and the lower surface of a single-layer GEM film is 300-400v. Rays are ionized by a drift region, electrons which are generated are magnified through GEM avalanche and are gathered by a readout electrode pad array (5), and the FET array (12) is controlled to select and sequentially read out to the data-acquisition system (8), and is transmitted to a data processing and displaying computer (9). The flat-plate real-time image-forming gas detector utilizes the FET switch array to achieve real-time image, which greatly reduces the number of electronic channels which are needed, and lowers the production cost.

Description

technical field [0001] The invention relates to a flat panel real-time imaging gas detector based on an FET switch array, which belongs to the field of radiation imaging. Background technique [0002] Flat-panel imaging detectors have been widely used in medical imaging, industrial non-destructive testing, and security inspection due to their large sensitive area, fast imaging speed, real-time imaging requirements, and ease of use. However, at present, commercial flat-panel imaging detectors use solid detection media, such as scintillation crystals or semiconductors, which are expensive, and the imaging area is also limited to a certain extent. [0003] The emergence of micro-unit structure gas detectors (MPGD, Micro Pattern Gas Detector) represented by GEM (Gas Electron Multiplier, gas electron multiplier) provides the possibility to develop flat-panel imaging devices based on gas detectors. The maximum unit scale of these micro-unit structure gas detectors is about 100 μm...

AI Technical Summary

Problems solved by technology

However, at present, commercial flat-panel imaging detectors use solid detection media, such as scintillation crystals or semiconductors, which are expensive, and the imaging area is also limited to a certain extent.

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