CN-121995431-A - Muon detector with variable scintillator spacing

CN121995431ACN 121995431 ACN121995431 ACN 121995431ACN-121995431-A

Abstract

The application discloses a muon detector with a variable scintillator interval, which comprises a support base, wherein a bottom plate is arranged at the upper end part of the support base, a lower layer detection part is fixedly arranged at the end part of the bottom plate, a multi-stage mechanical telescopic mechanism is arranged on the bottom plate, an upper layer detection part is arranged at the end part of the multi-stage mechanical telescopic mechanism, a main control data acquisition system is electrically connected with the multi-stage mechanical telescopic mechanism, the upper layer detection part and the lower layer detection part, and is used for setting and acquiring interval values between the upper layer detection part and the lower layer detection part, calculating according to the acquired real-time interval values and carrying out corresponding data correction and image reconstruction according to an effective detection range and an optimal detection area under the current configuration. The application can dynamically adjust the spatial resolution and the counting rate, thereby breaking through the performance limit caused by the design of fixed spacing and obviously improving the comprehensive efficiency in complex detection tasks.

Inventors

CHEN MIN
LU SITONG
WANG QINGHUA
GAO SHUNXI
LI LEI
ZHANG HUI
TAN JIE

Assignees

上海市地矿工程勘察(集团)有限公司
上海市岩土工程检测中心有限公司

Dates

Publication Date: 20260508
Application Date: 20260303

Claims (9)

1. A variable scintillator pitch muon detector comprising at least: The upper end part of the support base is provided with a bottom plate; the lower layer detection part is fixedly arranged at the end part of the bottom plate, a multi-stage mechanical telescopic mechanism is arranged on the bottom plate, and an upper layer detection part is arranged at the end part of the multi-stage mechanical telescopic mechanism; The main control data acquisition system is electrically connected with the multi-stage mechanical telescopic mechanism, the upper layer detection part and the lower layer detection part, and is used for setting and acquiring a distance value between the upper layer detection part and the lower layer detection part, calculating according to the acquired real-time distance value, and carrying out corresponding data correction and image reconstruction according to an effective detection range and an optimal detection area under the current configuration.
2. The variable scintillator spacing muon detector of claim 1, wherein the lower detection portion comprises a lower frame support, the upper detection portion comprises an upper frame support, and plastic scintillator strips and their associated photoelectric conversion devices and front-end electronics are arranged in an array in both the upper frame support and the lower frame support.
3. The variable scintillator spacing muon detector of claim 1, wherein the multi-stage mechanical telescoping mechanism comprises a mounting plate on which is disposed an electric push rod connected to an engagement arm that is connected to an upper housing bracket.
4. A variable scintillator spacing muon detector as set forth in claim 3 wherein the bottom of said engagement arm is further provided with a first infrared distance sensor for measuring in real time the spacing between said upper and lower housing brackets.
5. A muon detector with a variable scintillator spacing according to claim 3, wherein said multi-stage mechanical telescopic mechanism further comprises a first bracket and a second bracket, said first bracket and said second bracket are disposed on one side of the bottom plate, a groove is disposed on one side of said first bracket, a longitudinal screw is rotatably disposed in said groove, a screw seat is disposed on said longitudinal screw, said screw seat is connected with the mounting plate, one end of said longitudinal screw is connected with an output shaft of the driving motor, and said driving motor is disposed on one side of said first bracket.
6. A variable scintillator pitch muon detector according to claim 5, wherein one side of said mounting plate is further provided with a guide slide slidably disposed outside a guide slide rail disposed on one side of the second bracket.
7. A variable scintillator spacing muon detector as set forth in claim 6 wherein a second infrared distance sensor is also provided at the bottom of said mounting plate, said second infrared distance sensor being adapted to measure in real time the spacing between the mounting plate and the lower housing bracket.
8. The variable scintillator pitch muon detector of claim 1, wherein the master data acquisition system is coupled to the electric push rod, the drive motor, the first infrared distance sensor, and the second infrared distance sensor, and wherein the master data acquisition system is configured to synchronously control operation of the electric push rod and the drive motor according to distance data measured by the first infrared distance sensor and the second infrared distance sensor, and to control the upper frame support to move rapidly to a designated height position.
9. A variable scintillator pitch muon detector as set forth in claim 8 wherein said master data acquisition system incorporates a network module for receiving pitch setting instructions sent by a remote monitoring center and transmitting acquired detection data and real-time pitch values in real-time to the remote monitoring center.

Description

Muon detector with variable scintillator spacing Technical Field The invention belongs to the technical field of nuclear detection technology and particle physics, and particularly relates to a muon detector with a variable scintillator spacing. Background The cosmic ray muon imaging technique is an emerging non-destructive detection technique. The basic principle is that naturally occurring cosmic ray muon is used as a ray source, when the muon passes through a substance, coulomb scattering occurs to an electromagnetic field of an atomic nucleus, and the scattering angle of the muon is related to the radiation length (related to density and atomic number) of the passing substance. The density distribution image in the object can be reconstructed by measuring the change of the forward and backward movement direction of the muon passing through the measured object, so that perspective imaging is realized. Existing stationary muon detectors are typically constructed of upper and lower two or more position sensitive detector arrays for accurate determination of the muon's incident and exit vectors. The most common detection units employ plastic scintillator strips in combination with photomultiplier tubes or silicon photomultiplier tubes. The upper layer detector determines the incident direction of muon, the lower layer detector determines the emergent direction of the muon after the muon passes through the measured object, the scattering angle is obtained by calculating the difference of the directions of the muon and the lower layer detector, and then the internal structure of the measured object is inverted through a tomography algorithm. However, the existing fixed-pitch muon detector has single application scene and low detection efficiency due to the contradiction between the spatial resolution and the counting rate (detection efficiency). Furthermore, depending on the geometry, larger spacing can provide more accurate angular measurements (high spatial resolution), but can limit the solid angle of the detector, resulting in reduced received muon flux (low count rate). Conversely, a smaller pitch can receive more muon (high count rate), but the angular measurement accuracy will decrease (low spatial resolution). However, the baseline distance (upper and lower layer spacing) of existing detectors is fixed, so that there is a discrepancy between spatial resolution and count rate, ultimately resulting in detectors that do not perform optimally in all scenarios. Because the space is fixed, the working mode of the detector is single, and the performance of the fixed-space detector cannot be dynamically adjusted when facing the complex detection task of 'quick screening before fine diagnosis' (for example, firstly positioning a suspicious hidden danger area of a covering layer above a tunnel and then carrying out high-resolution imaging on the area). In order to complete the tasks, the whole detector system needs to be moved, the operation is complicated, or the detection time needs to be prolonged to make up for the performance deficiency, so that the detection flow is stiff, the whole detection efficiency is low, and the requirement on the detection timeliness in practical application is difficult to meet. Disclosure of Invention The invention aims to provide a muon detector with a variable scintillator spacing, which can dynamically adjust the spatial resolution and the counting rate of the muon detector, break through the performance limit caused by fixed spacing design, realize one machine for multiple purposes, realize the diversification of detection processes and remarkably improve the detection efficiency in complex detection tasks. In order to achieve the above purpose, the present invention provides the following technical solutions: A variable scintillator pitch muon detector comprising at least: The upper end part of the support base is provided with a bottom plate; the lower layer detection part is fixedly arranged at the end part of the bottom plate, a multi-stage mechanical telescopic mechanism is arranged on the bottom plate, and an upper layer detection part is arranged at the end part of the multi-stage mechanical telescopic mechanism; The main control data acquisition system is electrically connected with the multistage mechanical telescopic mechanism, the upper layer detection part and the lower layer detection part, and is used for setting and acquiring a distance value between the upper layer detection part and the lower layer detection part, calculating according to the acquired real-time distance value and carrying out corresponding data correction and image reconstruction according to the effective detection range and the optimal detection area under the current configuration In an embodiment, the lower layer detection portion includes a lower frame support, the upper layer detection portion includes an upper frame support, the upper frame support with plastic scintillator strips, a