Pulse gamma ray detection method and detection system based on laser polarization modulation

A technology of gamma ray and polarization modulation, which is applied in the direction of radiation intensity measurement, can solve the problem of low sensitivity, and achieve the effect of improving system sensitivity, high detection sensitivity, and increasing initial power

Active Publication Date: 2019-11-19
NORTHWEST INST OF NUCLEAR TECH
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Problems solved by technology

[0004] In order to solve the technical problem of low sensitivity of the existing active laser probe gamma ray detection method, the present invention provides a pulsed gamma ray detection method and detection system based on laser polarization modulation

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  • Pulse gamma ray detection method and detection system based on laser polarization modulation
  • Pulse gamma ray detection method and detection system based on laser polarization modulation
  • Pulse gamma ray detection method and detection system based on laser polarization modulation

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Embodiment Construction

[0049] The present invention will be further described below in conjunction with accompanying drawing.

[0050] Such as figure 1 As shown, the detection method provided by the present invention involves five key links: (A) gamma rays are converted into non-equilibrium free carriers through the radiation conversion crystal, (B) free carriers cause the refractive index of the radiation conversion crystal to transient change, (C 1 ) or (C 2 ) changes in the refractive index lead to changes in the amplitudes of different polarization components in the reflected and transmitted components of the probe laser, (D 1 ) or (D 2 ) The variation of the polarization component is amplified by means of a resonant cavity, and (E) the measurement of the variation of a specific polarization component is realized through an external optical path, thereby realizing the measurement of the time spectrum of the pulsed radiation field.

[0051] If the refractive index of the radiation conversion ...

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Abstract

In order to solve the technical problem that the existing active laser probe gamma ray detection method is low in sensitivity, the invention provides a pulse gamma ray detection method and detection system based on laser polarization modulation. The detection method comprises the following steps that 1) a gamma ray is converted into a non-equilibrium free carrier through a radiation conversion crystal, so that the refractive index of a radiation conversion crystal material is subjected to transient change; 2) a probe laser is incident to the radiation conversion crystal, and the transmissivityand / or reflectivity curves of the horizontal and / or vertical polarization components corresponding to different refractive indexes are obtained; 3) a certain polarized light component is selected asa polarized light component to be detected according to the obtained transmissivity and / or reflectivity curves of the horizontal and / or vertical polarization components corresponding to different refractive indexes, and an analyzing polarization light path is designed for filtering out the polarized light component to be detected; and 4) measuring and recording the transient change quantity of theintensity of the polarized light component to be detected, which is caused by the transient change of the refractive index of the radiation conversion crystal material.

Description

technical field [0001] The invention relates to a pulse gamma ray detection method and detection system utilizing laser polarization and crystal refractive index modulation. Background technique [0002] With the emergence and development of ultrafast radiation sources such as ICF (Inertial Confinement Fusion), inverse Compton scattering sources, and free electron lasers, the conventional "radiation-electric" detection technology is limited by the space charge effect, and the time response of the system The ability is usually the fastest to the sub-ns (nanosecond) level, which can no longer meet the detection requirements of ultrafast radiation pulses. [0003] The generation and relaxation time of the remaining carriers in the semiconductor is extremely short (<1ps), which makes the transient change process of the semiconductor refractive index induced by pulsed gamma rays very fast. This method is the main reason for obtaining the ultra-fast time response result (<1...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/24
CPCG01T1/24
Inventor 刘军欧阳晓平谭新建
Owner NORTHWEST INST OF NUCLEAR TECH
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