Optical fiber array neutron position sensitiveness detection system and method based on delay encoding

Abstract

The invention relates to an optical fiber array neutron position sensitiveness detection system and method based on delay encoding. The delay encoding is performed through pulse fluorescence signals sent by different lengths of optical fibers and having the effect on a neutron and a scintillator, so that the arrival times of pulse fluorescence signals transmitted by different lengths of optical fibers arriving at a rear-end photoelectric detector can be different. Therefore, the pulse fluorescence signals transmitted by the optical fibers can be confirmed by measuring the time differences of multiple pulse current signals output by the photoelectric detector and combining an encoding technology, finally the neutron acting position is determined according to the signals transmitted by the optical fibers, and time information can be determined according to the arrival time of the first pulse current signal and through back-stepping of the obtained neutron acting position. By adopting the method, an original multi-path paralleling signal reading mode can be changed into a single-channel serial signal reading mode, and accordingly a neutron acting position and time united measurement system is remarkably simplified.

Description

technical field [0001] The invention belongs to ray detection technology, and in particular relates to a delay coding-based optical fiber array neutron position sensitive detection system and method, which are used in neutron radiation imaging, material diagnosis, neutron scattering camera, neutron scattering / diffraction spectrometer and other fields Research. Background technique [0002] Sensitive detection of neutron position is an important measurement content in nuclear physics experiments, and plays an important role as a powerful exploration tool in the fields of material research, nondestructive testing, neutron radiation imaging and aerospace. In order to meet different experimental requirements, many different kinds of neutron position-sensitive radiation detection techniques have been extensively researched and developed, such as 3 He gas position sensitive detector, multi-filament proportional chamber, neutron sensitive scintillator array detector, etc. In rece...

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Problems solved by technology

However, the encoding technology currently used has not fundamentally changed the way the back-end signals are read in parallel. With the continuous expansion of the experimental scale, the electronic system is still very complicated.

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