Muon detector with variable scintillator spacing

Abstract

The invention discloses a muon detector with variable scintillator spacing, which comprises a supporting base, and a bottom plate is arranged at the upper end part of the supporting base; 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; and calculating according to the collected real-time spacing value, and performing corresponding data correction and image reconstruction according to the effective detection range and the optimal detection area under the current configuration. According to the method, the spatial resolution and the counting rate can be dynamically adjusted, so that the performance limitation caused by a fixed spacing design is broken through, and the comprehensive efficiency in a complex detection task is remarkably improved.

Description

Technical Field

[0001] This invention belongs to the field of nuclear detection technology and particle physics technology, and specifically relates to a muon detector with variable scintillator spacing. Background Technology

[0002] Cosmic ray muon imaging is an emerging non-destructive testing technique. Its basic principle is to use naturally occurring cosmic ray muons as a radiation source. When a muon passes through matter, it undergoes Coulomb scattering with the electromagnetic field of the atomic nuclei. The scattering angle is related to the radiation length of the material it passes through (which is related to density and atomic number). By measuring the change in the direction of the muons' motion before and after passing through the object, an image of the density distribution inside the object can be reconstructed, achieving "see-through" imaging.

[0003] Existing fixed muon detectors typically consist of two or more layers of position-sensitive detector arrays used to accurately determine the incident and exit vectors of muons. The most common detection unit combines a plastic scintillator strip with a photomultiplier tube or silicon photomultiplier tube. The upper detector determines the incident direction of the muon, while the lower detector determines its exit direction after passing through the object being measured. By calculating the difference between the two directions, the scattering angle is obtained, and then the internal structure of the object being measured can be deduced using tomographic imaging algorithms.

[0004] However, existing fixed-spacing muon detectors suffer from a trade-off between spatial resolution and count rate (detection efficiency), resulting in limited application scenarios and low detection efficiency.

[0005] Furthermore, based on geometric relationships, larger spacing provides more accurate angle measurements (high spatial resolution) but limits the detector's solid angle, resulting in a reduced received muon flux (low count rate). Conversely, smaller spacing allows for the reception of more muons (high count rate), but angle measurement accuracy decreases (low spatial resolution). However, the baseline distance (between upper and lower layers) of existing detectors is fixed, creating a trade-off between spatial resolution and count rate, ultimately preventing the detector from achieving optimal performance in all scenarios.

[0006] Because of their fixed spacing and limited operating modes, fixed-spacing detectors cannot dynamically adjust their performance when faced with complex detection tasks requiring a "rapid general survey followed by detailed diagnosis" approach (e.g., first locating potential hazards in the overburden layer above a tunnel, then performing high-resolution imaging of that area). To accomplish such tasks, the entire detector system needs to be moved, which is cumbersome; or the detection time needs to be extended to compensate for performance limitations, leading to a rigid detection process, low overall detection efficiency, and difficulty in meeting the timeliness requirements of practical applications. Summary of the Invention

[0007] The purpose of this invention is to provide a muon detector with variable scintillator spacing, which enables the muon detector to dynamically adjust its spatial resolution and count rate, overcome the performance limitations caused by fixed spacing design, achieve multiple uses, diversify the detection process, and significantly improve the detection efficiency in complex detection tasks.

[0008] To achieve the above objectives, the present invention provides the following technical solution: A muon detector with variable scintillator spacing, comprising at least: A support base, wherein a base plate is provided at the upper end of the support base; The lower detection unit is fixedly installed at the end of the base plate. The base plate is provided with a multi-stage mechanical telescopic mechanism, and the upper detection unit is installed at the end of the multi-stage mechanical telescopic mechanism. By changing the longitudinal height of the multi-stage mechanical telescopic mechanism, the distance between the upper detection unit and the lower detection unit can be adjusted. The main control data acquisition system is electrically connected to the multi-stage mechanical telescopic mechanism, the upper detection unit, and the lower detection unit. The main control data acquisition system is used to set and acquire the distance value between the upper and lower detection units, calculate the effective detection range and optimal detection area under the current configuration based on the acquired real-time distance value, and perform corresponding data correction and image reconstruction. In one embodiment, the lower detection unit includes a lower outer frame support, and the upper detection unit includes an upper outer frame support. Plastic scintillator strips and their matching photoelectric conversion devices and front-end electronics systems are arranged in an array within both the upper and lower outer frame supports. The lower detection unit is used to determine the exit trajectory of the muon, and the upper detection unit is used to determine the incident trajectory of the muon.

[0009] In one embodiment, the multi-stage mechanical telescopic mechanism includes a mounting plate, on which an electric push rod is disposed. The electric push rod is connected to a connecting arm, and the connecting arm is connected to an upper outer frame bracket, which can adjust the distance between the upper and lower detection parts in one stage.

[0010] In one embodiment, a first infrared distance sensor is also provided at the bottom of the connecting arm. The first infrared distance sensor is used to measure the distance between the upper outer frame support and the lower outer frame support in real time.

[0011] In one embodiment, the multi-stage mechanical telescopic mechanism further includes a first bracket and a second bracket. The first bracket and the second bracket are disposed on one side of the base plate. A groove is disposed on one side of the first bracket. A longitudinal lead screw is rotatably disposed in the groove. A lead screw nut is disposed on the longitudinal lead screw. The lead screw nut is connected to the mounting plate. One end of the longitudinal lead screw is connected to the output shaft of the drive motor. The drive motor is disposed on one side of the first bracket and can perform two-stage adjustment of the distance between the upper detection part and the lower detection part.

[0012] In one embodiment, a guide slider is also provided on one side of the mounting plate. The guide slider is slidably disposed on the outside of the guide rail, which is disposed on one side of the second bracket and can guide the longitudinal movement of the mounting plate.

[0013] In one embodiment, a second infrared distance sensor is also provided at the bottom of the mounting plate, which is used to measure the distance between the mounting plate and the lower outer frame bracket in real time.

[0014] In one embodiment, the main control data acquisition system is connected to the electric push rod, the drive motor, the first infrared distance sensor, and the second infrared spacing sensor. The main control data acquisition system can synchronously control the operation of the electric push rod and the drive motor based on the distance data measured by the first infrared distance sensor and the second infrared spacing sensor, and control the upper outer frame bracket to move quickly to a specified height position.

[0015] In one embodiment, the main control data acquisition system has a built-in network module for receiving spacing setting instructions sent by the remote monitoring center and transmitting the collected detection data and real-time spacing values ​​to the remote monitoring center in real time.

[0016] Compared with the prior art, the beneficial effects of the present invention are: The structural design of this invention fundamentally solves the contradiction between spatial resolution and count rate. Users can flexibly select the optimal spacing according to the specific needs of the detection mission (whether to prioritize accuracy or speed), so that the detector always works under the optimal configuration.

[0017] The structural design of this invention realizes an adaptive detection process of "broad first, then fine", which means that a small-pitch mode is used for rapid general survey to lock suspicious targets, and then seamlessly switches to a large-pitch mode for fine identification. This reduces the detection time wasted in non-interested areas and can improve the overall detection efficiency by several times.

[0018] The structural design of this invention can accurately correct geometric effects based on precise spacing values ​​and calculate the effective detection range under the current state. This avoids the systematic errors introduced by model mismatch during image reconstruction of fixed-spacing detectors, thereby obtaining more reliable and accurate imaging results. At the same time, the spacing adjustment between the upper and lower detection units is completed by electronic control, which is a one-button operation that is fast and accurate, further shortening the detection time. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the multi-stage mechanical telescopic mechanism in this invention; Figure 3 for Figure 2 Enlarged structural diagram at point A; Figure 4 This is a schematic diagram of the overall system framework of the present invention. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figures 1-4 The present invention provides a muon detector with variable scintillator spacing, including a lower detection unit and an upper detection unit. The lower detection unit is fixedly mounted on a base plate 2, which is located at the end of a support base 1. A multi-stage mechanical telescopic mechanism 6 is also provided on the base plate 2. The multi-stage mechanical telescopic mechanism 6 can quickly adjust and position the vertical height of the upper detector through multi-stage longitudinal height adjustment.

[0023] This detector also includes a main control data acquisition system 7, which is electrically connected to the multi-stage mechanical telescopic mechanism 6, the upper detection unit, and the lower detection unit. The main control data acquisition system 7 is used to set and record the spacing between the detection units, synchronize the data acquisition of the upper and lower detection units, and calculate and apply the effective detection range and optimal detection area under the current configuration based on the real-time spacing value, as well as perform corresponding data correction and image reconstruction.

[0024] In one embodiment, the lower detection unit includes a lower outer frame support 4, and the upper detection unit includes an upper outer frame support 5. Three plastic scintillators and their matching photoelectric conversion devices and front-end electronics systems are arranged in an array within the upper outer frame support 5 and the lower outer frame support 4. The lower detection unit is used to determine the exit trajectory of the muon, and the upper detection unit is used to determine the incident trajectory of the muon.

[0025] In one embodiment, the multi-stage mechanical telescopic mechanism 6 includes a mounting plate 602, on which an electric push rod 603 is provided. The electric push rod 603 is connected to a connecting arm 601, and the connecting arm 601 is connected to the upper outer frame bracket 5, which can adjust the distance between the upper and lower detection parts in one stage.

[0026] In one embodiment, a first infrared distance sensor 604 is also provided at the bottom of the connecting arm 601. The first infrared distance sensor 604 is used to measure the distance between the upper outer frame support 5 and the lower outer frame support 4 in real time.

[0027] In one embodiment, the multi-stage mechanical telescopic mechanism 6 further includes a first bracket 606 and a second bracket 610. The first bracket 606 and the second bracket 610 are disposed on one side of the base plate 2. A groove 607 is disposed on one side of the first bracket 606. A longitudinal lead screw 608 is rotatably disposed in the groove 607. A lead screw nut 605 is disposed on the longitudinal lead screw 608. The lead screw nut 605 is connected to the mounting plate 602. One end of the longitudinal lead screw 608 is connected to the output shaft of the drive motor 609. The drive motor 609 is disposed on one side of the first bracket 606 and can perform two-stage adjustment of the distance between the upper detection part and the lower detection part.

[0028] In one embodiment, a guide slider 611 is also provided on one side of the mounting plate 602. The guide slider 611 is slidably disposed on the guide rail 612, which is disposed on one side of the second bracket 610, and can guide the longitudinal movement of the mounting plate 602.

[0029] In one embodiment, a second infrared distance sensor 613 is also provided at the bottom of the mounting plate 602. The second infrared distance sensor 613 is used to measure the distance between the mounting plate 602 and the lower outer frame bracket 4 in real time.

[0030] In one embodiment, the main control data acquisition system 7 is connected to the electric push rod 603, the drive motor 609, the first infrared distance sensor 604, and the second infrared spacing sensor 613. The main control data acquisition system 7 can synchronously control the operation of the electric push rod 603 and the drive motor 609 based on the distance data measured by the first infrared distance sensor 604 and the second infrared spacing sensor 613, and use a position-based PID algorithm to control the upper outer frame bracket 5 to move quickly to a specified height position.

[0031] Positional PID algorithm: ; In the formula: The output of the PID controller (corresponding to the speed of the drive motor 609 / the extension and retraction speed of the electric push rod 603). This is the proportionality coefficient. The integral coefficient is... These are the differential coefficients; all three were experimentally calibrated to suit the mechanical characteristics of this detector. For real-time spacing error, The integral term of the error. This is the differential term of the error.

[0032] This invention completes parameter input and acquisition in the following way: The user sets the target spacing in the main control data acquisition system 7. (i.e., the target distance between the upper and lower outer frame brackets), the system collects the measured distance D (actual distance between the upper and lower outer frame brackets) of the first infrared distance sensor 604 and the measured distance L (distance between the mounting plate 602 and the lower outer frame bracket 4) of the second infrared distance sensor 613.

[0033] pass Calculate the spacing error and determine and (The maximum allowable error of the system) The relationship between the maximum extension and retraction stroke of the electric actuator.

[0034] The specific method for determining the adjustment level is as follows: like No adjustment is needed; record the current spacing D. like Only activate the electric push rod 603 for adjustment; like First, start adjusting the longitudinal lead screw 608, then start the electric push rod 603 to complete the fine adjustment.

[0035] In one embodiment, the main control data acquisition system 7 has a built-in network module that can transmit data to a remote monitoring center in real time.

[0036] The principle for adjusting the distance between the upper and lower detection parts of the detector in this invention is as follows: According to the requirements of the detection task (such as small spacing for rapid surveys and large spacing for detailed diagnosis), the user inputs the target spacing value of the upper and lower detection units into the main control data acquisition system. The system stores this value as the benchmark judgment value and at the same time retrieves the built-in mechanical parameters (such as the maximum extension stroke of the electric actuator, the lead screw, the sensor calibration parameters, etc.).

[0037] The main control data acquisition system 7 continuously receives real-time ranging electrical signals transmitted by the first infrared distance sensor 604 and the second infrared distance sensor 613, and converts the electrical signals into digital quantities to obtain the actual distance D between the upper outer frame bracket 5 and the lower outer frame bracket 4 (data from the first infrared distance sensor 604) and the actual distance L between the mounting plate 602 and the lower outer frame bracket 4 (data from the second infrared distance sensor 613). The system then compares the actual distance D with the target distance. The difference is calculated to obtain the spacing adjustment error. And based on the absolute value of the error and the preset threshold of the main control data acquisition system 7 (maximum extension stroke of electric actuator 603), The maximum allowable error of the main control data acquisition system 7 ,generally The system automatically determines the adjustment level to be activated based on the size relationship (≤1mm). like No adjustment is needed. The main control data acquisition system 7 determines that the current spacing matches the target value and directly records the actual spacing value, providing parameters for subsequent detection data correction and image reconstruction. like Only the electric push rod 603 is activated for adjustment, and the spacing error is eliminated through short-stroke fine adjustment; If: first start the longitudinal lead screw 608 transmission adjustment to complete the long stroke coarse adjustment, so that the gap error after coarse adjustment is reduced to ≤, then start the electric push rod 603 adjustment to complete the fine adjustment.

[0038] After receiving the real-time distance value D from the first infrared distance sensor 604 and the second infrared distance sensor 613, the main control data acquisition system 7 calculates the detector solid angle Ω(D) at the current distance according to the standard geometric model (the calculation formula is as follows: In the formula: A is the effective receiving area of ​​a single scintillator detection surface, and is the inherent calibration parameter of the detector. The detected muon count rate is normalized to the standard solid angle. The muon count rate normalization is as follows: The main control data acquisition system 7 further normalizes and corrects the real-time acquired muon count rate R(D) according to the solid angle ratio: In the formula, The preset standard solid angle can eliminate the geometric efficiency differences introduced by the change in the spacing of the detectors (the change in spacing causes the effective detection solid angle to shift, which in turn causes natural fluctuations in the count rate). This allows the muon count rate collected at different spacings to be uniformly calculated under the standard solid angle reference, ensuring the lateral comparability of the detection data during the full-range spacing adjustment process. This provides a consistent and accurate raw data foundation for subsequent muon tomography reconstruction, effectively improving the reliability and spatial resolution of the imaging results.

[0039] The main control data acquisition system 7 calculates the driving parameters of the actuator (number of rotations / speed of the drive motor 609, extension / retraction direction / stroke of the electric push rod 603) based on the determined adjustment level and the built-in PID adjustment algorithm. The driving parameters are then converted into electrical signals and sent to the corresponding actuators (drive motor 609 / electric push rod 603) to control the start / stop, rotation / extension direction, and running speed / stroke of the actuators.

[0040] The driving parameter conversion method for the longitudinal lead screw 608 transmission is as follows: the main control data acquisition system 7 converts the required longitudinal movement stroke into the number of rotations of the drive motor based on the lead screw lead (inherent parameter), thereby achieving precise control of the stroke.

[0041] After receiving the drive signal from the main control data acquisition system 7, the drive motor 609 and the electric push rod 603 operate according to preset parameters to achieve the longitudinal movement of the upper detection unit. When the longitudinal lead screw 608 is adjusted, the drive motor 609 drives the longitudinal lead screw 608 to rotate, and the lead screw nut 605 drives the mounting plate 602 and the upper detection unit to move synchronously. The first infrared distance sensor 604 and the second infrared distance sensor 613 provide real-time feedback on the distance change, and the system dynamically adjusts the operating parameters of the drive motor 609 until the coarse adjustment is completed. During adjustment, the electric push rod 603 extends and retracts, causing the upper outer frame bracket 5 to move slightly. The first infrared distance sensor 604 provides real-time feedback on changes in the core spacing, and the system dynamically adjusts the extension and retraction stroke of the electric push rod 603 until fine-tuning is complete. During the adjustment process, the guide slider 611 and the guide rail 612 maintain a sliding fit to ensure the perpendicularity of the mechanical structure.

[0042] The first infrared distance sensor 604 and the second infrared distance sensor 613 continuously transmit new measured distance data to the main control data acquisition system 7. The main control data acquisition system 7 continuously calculates the difference between the new measured value and the target value. If an error still exists, it continuously outputs a fine-tuning drive signal until the error between the measured distance and the target distance is reduced. This achieves precise spacing matching. The adjustment process is a dynamic closed-loop correction.

[0043] When the system determines When the time is right, a stop signal is immediately sent to the actuator, and the drive motor 609 / electric push rod 603 stops running, thus completing this spacing adjustment. At the same time, the main control data acquisition system 7 automatically records the final actual spacing value of this adjustment and synchronizes this parameter to the detection data acquisition module, providing basic geometric parameters for subsequent effective detection range calculation, optimal detection area delineation, detection data correction, and image reconstruction.

[0044] The main control data acquisition system 7 has a built-in network module, which can establish a wireless / wired communication connection with the remote monitoring center to realize remote setting and adjustment of the spacing. The remote monitoring center can remotely input the target spacing value according to the on-site detection needs. After receiving the remote command, the main control system will automatically start the above adjustment process without on-site manual operation. At the same time, the system can automatically complete the seamless switching of different spacings according to the preset detection task process (such as "first small spacing general survey, then large spacing detailed survey"), realize the automated linkage of detection and adjustment, and improve detection efficiency.

[0045] The structural design of this invention can accurately correct geometric effects based on precise spacing values ​​and calculate the effective detection range under the current state. This avoids the systematic errors introduced by model mismatch during image reconstruction of fixed-spacing detectors, thereby obtaining more reliable and accurate imaging results. At the same time, the spacing adjustment between the upper and lower detection units is completed by electronic control, which is a one-button operation that is fast and accurate, further shortening the detection time.

[0046] The following provides a detailed description of the specific process of applying this invention to the monitoring of sediment thickness stability above riverbed tunnels. Those skilled in the art can clearly understand the implementation steps of this invention based on this description and can reproduce the technical solution.

[0047] The thickness of the sedimentary layer covering the riverbed tunnel is dynamically changing under the combined influence of ship navigation, water erosion, and deposition. An excessively thin sedimentary layer weakens the buffering effect, increasing the water pressure and impact on the tunnel roof; conversely, an excessively thick sedimentary layer in certain areas generates uneven loads. Both situations threaten the structural safety of the tunnel. This invention uses the relative change in muon flux inside the tunnel to inversely determine the dynamic changes in the thickness of the sedimentary layer above the tunnel, achieving long-term, real-time, and non-destructive safety monitoring and early warning.

[0048] In this embodiment, both the lower and upper detection units adopt a modular design. Each array consists of a single 90cm*25cm*25cm detection unit, with a total area of ​​0.225m². 2 To cover a sufficient monitoring range. The core of the detection unit consists of a plastic scintillator strip 3 and a silicon photomultiplier tube array, which has the characteristics of being moisture-resistant and electromagnetic interference-resistant, making it very suitable for tunnel environments.

[0049] The support base 1 is a low-profile steel structure that is directly fixed to a pre-embedded base inside the tunnel to ensure stability. The multi-stage mechanical telescopic mechanism 6 can work stably in humid environments, allowing the upper detection unit to be infinitely adjusted between 0.8 meters (minimum spacing) and 2.5 meters (maximum spacing) from the lower detection unit.

[0050] The main control data acquisition system 7 is installed inside the equipment box in the tunnel and connected to the detector via waterproof cables. In addition to controlling the drive and acquiring data, the system also has a built-in network module that can transmit data to a remote monitoring center in real time.

[0051] Cosmic ray muons, as they pass through river water and sediment layers, interact with the atomic nuclei within, losing energy and being absorbed. A definite negative correlation exists between the sediment layer thickness H and the measured muon flux Φ: Φ = Φ0 * exp(-μ * H), where Φ0 is the standard flux without a cover layer, and μ is the effective attenuation coefficient of the sediment layer for muons. Therefore, an increase in flux Φ implies a thinner sediment layer thickness H; conversely, a decrease in flux Φ implies an increase in sediment layer thickness H.

[0052] This invention optimizes the monitoring process through the following variable spacing design: First, for the vast majority of the time, the main control data acquisition system 7 maintains the upper-level detector at a small spacing of 0.8 meters. In this mode, the detector has a large solid angle and a high muon count rate, enabling rapid accumulation of statistics.

[0053] In the initial stage of equipment operation, measurements were taken for several consecutive days to obtain the baseline muon flux Φ_baseline at this location under the "normal" deposition layer thickness.

[0054] The main control data acquisition system 7 continuously compares the real-time flux Φ_current with Φ_baseline. Once a sudden change in flux is detected (e.g., a change exceeding 5 standard deviations within 1 hour), the system immediately triggers an alarm. A significant increase in flux may indicate that the overlying sedimentary layer is being thinned by severe erosion from water flow or ship propellers; a significant decrease in flux may indicate a large amount of sediment deposition in the short term. Real-time monitoring and rapid early warning of the detected material enable a long-term baseline monitoring and rapid response mode (small-pitch mode).

[0055] Secondly, when the alarm is triggered in the small-pitch mode, or during scheduled fine measurements, the main control data acquisition system automatically drives the upper detection unit to a large-pitch position of 2.5 meters via a multi-stage mechanical telescopic mechanism. In this mode, the detector's angular resolution is extremely high, enabling the location of abnormal areas and improving measurement accuracy.

[0056] Specifically, the high angular resolution allows the detector to identify the direction from which muons originate. By analyzing flux changes at different azimuth angles, it is possible to determine whether the thinning or thickening of the sedimentary layer is localized or global. For example, if the muon flux is abnormally high only on one side of the tunnel axis, it strongly suggests that localized scouring is occurring on that side of the riverbed, which may be related to a specific water flow direction or ship waves, thus allowing for rapid localization of a region.

[0057] For slow, cumulative thickness changes, the large-pitch mode can provide more accurate flux measurements, thus more accurately reflecting long-term thickness trends, providing data support for preventative maintenance, and improving measurement accuracy.

[0058] Furthermore, the main control data acquisition system 7 integrates advanced data processing algorithms. The software synchronously receives water level and flow velocity monitoring data from the river channel. Because water level changes themselves affect muon flux (increased water depth is equivalent to increased cover layer), the algorithm automatically deducts the impact of water level changes on flux, thus attributing flux changes purely to changes in sediment thickness and performing environmental factor correction.

[0059] By combining data obtained at different intervals, the main control data acquisition system 7 can generate a spatiotemporal evolution map of the thickness of the sediment layer at the top of the tunnel, intuitively showing which areas are dynamically changing "hot spots" and drawing the spatiotemporal evolution map.

[0060] Based on engineering safety standards, two-way warning thresholds are set for both thinning (increased flux) and thickening (decreased flux). Once the monitored data exceeds the threshold, the main control data acquisition system will send multi-level warning information to the administrator's mobile phone or monitoring screen, thus achieving threshold-based early warning.

[0061] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents. The purpose of this invention is to provide a muon detector with variable scintillator spacing, enabling the muon detector to dynamically adjust its spatial resolution and count rate, overcoming the performance limitations of fixed spacing design, achieving multiple uses, diversifying the detection process, and significantly improving detection efficiency in complex detection tasks.

Claims

1. A muon detector with variable scintillator spacing, characterized in that, At least including: A support base, wherein a base plate is provided at the upper end of the support base; The lower detection unit is fixedly installed at the end of the base plate. The base plate is provided with a multi-stage mechanical telescopic mechanism, and the upper detection unit is installed at the end of the multi-stage mechanical telescopic mechanism. By changing the longitudinal height of the multi-stage mechanical telescopic mechanism, the distance between the upper detection unit and the lower detection unit can be adjusted. The main control data acquisition system is electrically connected to the multi-stage mechanical telescopic mechanism, the upper detection unit, and the lower detection unit. The main control data acquisition system is used to set and acquire the distance value between the upper detection unit and the lower detection unit, calculate the data based on the acquired real-time distance value, and perform corresponding data correction and image reconstruction based on the effective detection range and optimal detection area under the current configuration.

2. The muon detector with variable scintillator spacing according to claim 1, characterized in that, The lower detection unit includes a lower outer frame support, and the upper detection unit includes an upper outer frame support. Plastic scintillator strips and their matching photoelectric conversion devices and front-end electronic systems are arranged in an array within both the upper and lower outer frame supports.

3. The muon detector with variable scintillator spacing according to claim 1, characterized in that, The multi-stage mechanical telescopic mechanism includes a mounting plate, on which an electric push rod is mounted. The electric push rod is connected to a connecting arm, and the connecting arm is connected to an upper outer frame bracket.

4. The muon detector with variable scintillator spacing according to claim 3, characterized in that, The bottom of the connecting arm is also provided with a first infrared distance sensor, which is used to measure the distance between the upper outer frame support and the lower outer frame support in real time.

5. The muon detector with variable scintillator spacing according to claim 3, characterized in that, The multi-stage mechanical telescopic mechanism further includes a first bracket and a second bracket. The first bracket and the second bracket are disposed on one side of the base plate. A groove is disposed on one side of the first bracket. A longitudinal lead screw is rotatably disposed in the groove. A lead screw nut is disposed on the longitudinal lead screw. The lead screw nut is connected to the mounting plate. One end of the longitudinal lead screw is connected to the output shaft of the drive motor. The drive motor is disposed on one side of the first bracket.

6. The muon detector with variable scintillator spacing according to claim 5, characterized in that, A guide slider is also provided on one side of the mounting plate. The guide slider is slidably disposed on the outside of the guide rail, which is disposed on one side of the second bracket.

7. The muon detector with variable scintillator spacing according to claim 6, characterized in that, A second infrared distance sensor is also provided at the bottom of the mounting plate. The second infrared distance sensor is used to measure the distance between the mounting plate and the lower outer frame bracket in real time.

8. The muon detector with variable scintillator spacing according to claim 1, characterized in that, The main control data acquisition system is connected to the electric push rod, the drive motor, the first infrared distance sensor, and the second infrared spacing sensor. The main control data acquisition system can synchronously control the operation of the electric push rod and the drive motor based on the distance data measured by the first infrared distance sensor and the second infrared spacing sensor, and control the upper outer frame bracket to move quickly to the specified height position.

9. The muon detector with variable scintillator spacing according to claim 8, characterized in that, The main control data acquisition system has a built-in network module, which is used to receive the spacing setting command sent by the remote monitoring center and transmit the collected detection data and real-time spacing value to the remote monitoring center in real time.

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