Offline Detection Method and System for Neutron Detector

Abstract

The present invention discloses an off-line detection method and system for a neutron detector. The method includes: performing static data tests on the cable of the detector under test to generate static detection results; wherein, the static data tests include at least one of insulation resistance test, capacitance test, reflection curve test, and dielectric constant test; performing background noise tests on the cable of the detector under test to generate noise detection results; performing vibration simulation tests on the cable of the detector under test to generate vibration detection results; performing detection damage tests on the cable of the detector under test, and generating damage measurement results according to the test results and the static detection results; generating evaluation results according to the static detection results, noise detection results, vibration detection results, and damage measurement results. Implementing the present invention enables off-line detection of neutron detectors, and defects can be effectively detected before the detectors are installed, providing technical support for the stable operation of the out-of-core neutron measurement system in nuclear power plants.

Description

Technical Field

[0001] The present invention relates to the technical field of instrument detection, and particularly to an off-line detection method and system for a neutron detector. Background Art

[0002] A neutron detector is an important device for measuring parameters such as the reactor power, power change rate, and radial and axial distributions of power in a nuclear power plant. It plays a crucial role in nuclear reactor power detection and safety protection. Therefore, for the safe and stable operation of the reactor, it is necessary to ensure the reliability of the neutron detector and the accuracy of neutron detection. For newly purchased neutron detectors, before being installed at the reactor core position, due to objective conditions, it is impossible to artificially generate a sufficient intensity of neutron flux to verify the function of the neutron detector. Only after the neutron detector is installed in the reactor can it be known whether the newly replaced detector is working properly after the reactor is started. If, after the neutron detector is replaced, it is found that the detector has a fault, no signal output, signal fluctuation, or unstable output, etc., it may cause the reactor to be forced to stop operating, and it is necessary to replace the neutron detector again and then restart the reactor. Moreover, the replacement of the neutron detector is difficult, time-consuming, and the process is complex. This situation seriously affects the work progress of the nuclear power plant. At the same time, installing an unstable neutron detector on-site also has an adverse impact on reactor monitoring and may pose an unpredictable risk to nuclear safety. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an off-line detection method and system for a neutron detector in view of at least one defect existing in the prior art.

[0004] The technical solution adopted by the present invention to solve its technical problem is to construct an off-line detection method for a neutron detector, including:

[0005] S10. Perform static data testing on the cable of the detector to be measured to generate a static detection result; wherein, the static data testing includes at least one of insulation resistance testing, capacitance testing, reflection curve testing, and dielectric constant testing;

[0006] S20. Perform background noise testing on the cable of the detector to be measured to generate a noise detection result;

[0007] S30. Perform vibration simulation testing on the cable of the detector to be measured to generate a vibration detection result;

[0008] S40. Perform detection damage testing on the cable of the detector to be measured, and generate a damage detection result according to the test result and the static detection result;

[0009] S50. Generate an evaluation result according to the static detection result, noise detection result, vibration detection result, and damage detection result.

[0010] In the off-line detection method of the neutron detector according to the present invention, in the step S10, the static data test includes: measuring the static data of the cable of the detector under test, comparing the static data with the preset standard value of the corresponding static data, and generating the static detection result.

[0011] In the off-line detection method of the neutron detector according to the present invention, in the step S10, the reflection curve test includes: performing impedance matching on the cable of the detector under test according to the preset impedance parameters, performing a time-domain reflection test to generate the reflection curve of the corresponding cable, and performing an overlap analysis on each reflection curve, and generating the reflection curve test result in the static detection result according to the overlap analysis result.

[0012] In the off-line detection method of the neutron detector according to the present invention, in the step S20, the background noise test includes: measuring the output current of the signal output cable according to at least one set of preset input voltage parameters, comparing the output current with the preset noise standard value of the corresponding group, and generating the noise detection result.

[0013] In the off-line detection method of the neutron detector according to the present invention, in the step S30, the vibration simulation test includes: performing a vibration reflection test on the cable of the detector under test to generate a vibration reflection test result for characterizing the connection condition of the wire core of the detector under test; and performing a mechanical vibration test on the cable of the detector under test to generate a mechanical vibration test result for characterizing the connection condition of the mechanical components of the detector under test; the vibration reflection test result and the mechanical vibration test result constitute the vibration detection result.

[0014] In the off-line detection method of the neutron detector according to the present invention, the vibration reflection test includes: performing at least one vibration amplified reflection test, and determining whether to perform at least one more vibration amplified reflection test according to the result of the first vibration amplified reflection test and the historical amplified reflection curve, and generating the vibration reflection test result according to the results of each vibration amplified reflection test and the historical amplified reflection curve; wherein, the vibration amplified reflection test includes inputting a first simulated vibration signal at a first preset position of the detector under test, and performing a time-domain amplified reflection test during the vibration, and the obtained amplified reflection curve is used as the result of this vibration amplified reflection test.

[0015] In the off-line detection method of the neutron detector according to the present invention, in the step S30, the mechanical vibration test includes: inputting a second simulated vibration signal at a second preset position of the detector under test, performing the background noise test during the vibration, and determining the mechanical vibration test result according to the noise detection result of the background noise test and the preset noise standard value.

[0016] In the off-line detection method of the neutron detector according to the present invention, in the step S30, the first preset position includes the connector and the housing of the detector under test; the second preset position includes at least one of a preset vibration point position, a cable connector, and a cable outlet.

[0017] The present invention also provides an off-line detection system for a neutron detector, comprising:

[0018] A static test unit for performing static data tests on the cable of the detector under test and outputting static detection results; wherein, the static data tests include at least one of insulation resistance tests, capacitance tests, reflection curve tests, and dielectric constant tests;

[0019] A noise test unit for performing background noise tests on the cable of the detector under test and outputting noise detection results;

[0020] A vibration test unit for performing vibration simulation tests on the cable of the detector under test and outputting vibration detection results;

[0021] A damage detection unit for performing detection damage tests on the cable of the detector under test and generating damage detection results according to the test results and the static detection results;

[0022] An evaluation unit for generating evaluation results according to the static detection results, noise detection results, vibration detection results, and damage detection results.

[0023] In the off-line detection system for a neutron detector according to the present invention, the vibration test unit includes:

[0024] A vibration reflection test unit for performing vibration reflection tests on the cable of the detector under test and outputting vibration reflection test results for characterizing the connection status of the wire core of the detector under test;

[0025] A mechanical vibration test unit for performing mechanical vibration tests on the cable of the detector under test and outputting mechanical vibration test results for characterizing the connection status of the mechanical components of the detector under test;

[0026] The vibration reflection test results and the mechanical vibration test results constitute the vibration detection results.

[0027] The present invention has the following beneficial effects: The off-line detection of the neutron detector is realized by adopting a variety of test methods, and it is possible to effectively discover whether there are defects inside, whether the functions are abnormal, and whether the wiring connections are stable, etc. before the detector is installed, so as to avoid discovering abnormalities after the neutron detector is installed on site as much as possible, and the judgment is fast and accurate, providing technical guarantee for the stable operation of the out-of-core neutron measurement system of the nuclear power plant. Description of the Drawings

[0028] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. In the accompanying drawings:

[0029] Figure 1 is a flowchart of the off-line detection method for a neutron detector provided by the present invention;

[0030] Figure 2 is an example diagram of the second preset position provided by the present invention;

[0031] Figure 3 is a structural diagram of the off-line detection method for a neutron detector provided by the present invention. Detailed Embodiments

[0032] For a clearer understanding of the technical features, objectives, and effects of the present invention, the detailed embodiments of the present invention will now be described in contrast with the accompanying drawings.

[0033] It should be noted that the flowcharts shown in the accompanying drawings are only illustrative descriptions, and do not necessarily include all contents and operations / steps, nor do they necessarily need to be executed in the described order. For example, some operations / steps can be decomposed, while some operations / steps can be combined or partially combined. Therefore, the actual execution order may change according to the actual situation.

[0034] The block diagrams shown in the accompanying drawings are only functional entities, and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software form, or implemented in one or more hardware modules or integrated circuits, or implemented in different networks and / or processor devices and / or microcontroller devices.

[0035] Refer to Figure 1 , the present invention provides an off-line detection method for a neutron detector, including: step S10, step S20, step S30, step S40, and step S50.

[0036] S10. Perform static data testing on the cable of the detector under test to generate a static detection result; wherein, the static data testing includes at least one of insulation resistance testing, capacitance testing, reflection curve testing, and dielectric constant testing. Among them, the cable of the neutron detector (referred to as the detector cable) includes a signal output cable, a working voltage cable, and a compensation voltage cable.

[0037] In some embodiments, the static data testing in step S10 includes: measuring the static data of the cable of the detector under test, comparing the static data with the preset standard values of the corresponding static data, and generating a static detection result. Among them, the preset standard values include the core-screen insulation resistance standard value, the screen-ground insulation resistance standard value, the inter-screen insulation resistance, the core-screen capacitance standard value, the coincidence standard value, and the dielectric constant standard value.

[0038] In some embodiments, the insulation resistance test includes: inputting a DC voltage to the detector cable, measuring the core-screen insulation resistance (the resistance between the core and the shield layer), the screen-ground insulation resistance (the resistance between the shield layer and the ground), and the screen-screen insulation resistance (the resistance between the shield layers of different probes) of each cable respectively, and continuously testing each item for a preset time duration. Comparing the measured insulation resistance with the corresponding preset standard value, and taking the comparison results of each item as the insulation resistance test results in the static detection results. For example, when the core-screen insulation resistance is greater than the core-screen insulation resistance standard value, it is determined that the core-screen insulation resistance of the cable is qualified. Among them, the DC voltage can be 500V, the preset time can be 1 minute, the core-screen insulation resistance standard value can be 10 GΩ, the screen-ground insulation resistance standard value can be 1 MΩ, and the screen-screen insulation resistance can be 1 MΩ.

[0039] In some embodiments, the capacitance test includes: measuring the core-screen capacitance (the capacitance value between the core and the shield layer) of each cable respectively. When the core-screen capacitance of the cable is greater than the core-screen capacitance standard value, it is determined that the core-screen capacitance of the cable is qualified, and the determination results of each cable are used as the capacitance test results in the static detection results. Among them, the core-screen capacitance standard value can be 2.10 nF.

[0040] In some embodiments, the reflection curve test includes: performing impedance matching on the detector cable under test according to the preset impedance parameters, performing a time-domain reflection test, generating the reflection curve of the corresponding cable, and analyzing the coincidence degree of each reflection curve. Generating the reflection curve test results in the static detection results according to the coincidence degree analysis results. Further, when the coincidence degree between each reflection curve is greater than the coincidence degree standard value, it is determined that the time-domain reflection performance of the detector under test is qualified, and this determination result is used as the reflection curve test results in the static detection results. Among them, the preset impedance parameter can be 50 Ω.

[0041] In some embodiments, the dielectric constant test includes: performing a dielectric constant test on each cable according to the corresponding dielectric test voltage. When the dielectric constant of the cable is greater than the dielectric constant standard value, it is determined that the dielectric constant of the cable is qualified, and the determination results of each cable are used as the dielectric constant test results in the static detection results.

[0042] S20. Perform a background noise test on the detector cable under test to generate noise detection results.

[0043] In some embodiments, the background noise test includes: measuring the output current of the signal output cable according to at least one set of preset input voltage parameters, comparing the output current with the preset noise standard value of the corresponding group, and generating a noise detection result. In some embodiments, the groups of preset input voltage parameters include (+600V, -50V), (+600V, 0V), and (+600V, +200V); wherein, the abscissa corresponds to the input voltage of the working voltage cable, and the ordinate corresponds to the input voltage of the compensation voltage line. Taking the group (+600V, -50V) as an example, after setting the input voltage of the working voltage cable to +600V and the input voltage of the compensation voltage line to -50V, measure the output current of the signal output cable. If the difference between the output current and the preset noise standard value of this group is less than the preset error value, it is determined that the background noise of this group meets the standard, and the determination results of each group are used as the noise detection result.

[0044] S30. Perform a vibration simulation test on the cable of the detector under test to generate a vibration detection result.

[0045] In some embodiments, the vibration simulation test includes: performing a vibration reflection test on the cable of the detector under test to generate a vibration reflection test result for characterizing the connection condition of the wire core of the detector under test; and performing a mechanical vibration test on the cable of the detector under test to generate a mechanical vibration test result for characterizing the connection condition of the mechanical components of the detector under test; the vibration reflection test result and the mechanical vibration test result constitute the vibration detection result.

[0046] In some embodiments, the vibration reflection test includes: performing at least one vibration amplified reflection test, and judging whether to perform at least one more vibration amplified reflection test according to the result of the first vibration amplified reflection test and the historical amplified reflection curve, and generating a vibration reflection test result according to the results of each vibration amplified reflection test and the historical amplified reflection curve. Among them, the vibration amplified reflection test includes inputting a first simulated vibration signal at a first preset position of the detector under test, and during the vibration, performing a time-domain amplified reflection test, and the obtained amplified reflection curve is used as the result of this vibration amplified reflection test. In addition, the first preset position includes the joint and the housing of the detector under test; the first simulated vibration signal can be provided by a vibration simulation device, which is not limited herein.

[0047] Time-domain amplified reflection testing has the same principle as time-domain reflection testing. The difference is that during the testing process, the test signal in time-domain amplified reflection testing is larger. When there is an abnormal poor contact in the connection of the wire core, vibration will cause the impedance of the wire core to change. At this time, when performing time-domain reflection detection, the output reflection curve will show fluctuations. If a larger test signal is input during the test, these fluctuations can be amplified, which is equivalent to amplifying the reflection curve, that is, obtaining an amplified reflection curve, so as to more accurately characterize the time-domain reflection characteristics of the cable, so as to perform fluctuation analysis on the line type of the amplified reflection curve subsequently.

[0048] Specifically, taking the signal output cable as an example, first perform a vibration amplified reflection test on the signal output cable to obtain the first amplified reflection curve. Analyze the coincidence degree between this curve and the historical amplified reflection curve. If the obtained coincidence degree is less than the amplified coincidence degree standard value, it indicates that there may be an abnormality in the wire core of the signal output cable. Therefore, it is determined that at least one more vibration amplified reflection test needs to be performed to obtain several amplified reflection curves. Each amplified reflection curve is respectively analyzed for the coincidence degree with the historical amplified reflection curve. If the result of each coincidence degree analysis is less than the coincidence degree standard value, it is determined that the cable has an abnormal poor contact as the vibration reflection test result.

[0049] In some embodiments, the mechanical vibration test includes: inputting a second simulated vibration signal at a second preset position of the detector under test. During the vibration process, perform background noise testing and judge the noise detection result of the background noise testing to generate a mechanical vibration test result. Further, according to the noise detection result, it is known that the background noise of a certain group of the detector does not meet the standard, indicating that there is an abnormal connection of mechanical components at or near the second preset position. Among them, the second preset position includes at least one of a preset vibration point position, a cable joint, and a cable outlet, and specifically can refer to Figure 2 , A corresponds to the preset vibration point position, B corresponds to the cable joint of the detector, and C corresponds to the cable outlet of the detector; further, the preset vibration point position is opposite to the internal connection point of the detector and is located on the outer shell, that is, the preset vibration point position is directly opposite to the internal connection point of the detector. Correspondingly, the second simulated vibration signal can also be provided by a vibration simulation device, and the magnitude of the vibration signal can also be adjusted according to the input position.

[0050] S40. Perform a detection damage test on the cable of the detector under test, and generate a damage measurement result according to the test result and the static detection result. Further, since the detector under test may be damaged to a certain extent during the tests in steps S10 to S30, especially the dielectric constant test and the vibration simulation test, it is necessary to perform an insulation resistance test on the cable of the detector under test again to determine whether the detector under test has been damaged or changed due to the test.

[0051] S50. Generate an evaluation result based on the static detection result, noise detection result, vibration detection result, and loss measurement result. Specifically, after steps S10 to S40 are executed, a complete evaluation report is issued according to each detection result, including displaying the process parameters of each test (including the insulation resistance value, reflection curve, dielectric constant, etc. of specific cables) and the judgment result (qualified or not), enabling the staff to intuitively distinguish whether the detector under test meets the usage requirements.

[0052] Reference Figure 3 , the present invention also provides an off-line detection system for neutron detectors, including: a static test unit, a noise test unit, a vibration test unit, a loss measurement unit, and an evaluation unit.

[0053] The static test unit is used to perform static data tests on the cables of the detector under test and output static detection results; wherein, the static data tests include at least one of insulation resistance tests, capacitance tests, reflection curve tests, and dielectric constant tests.

[0054] Furthermore, the process of the static data test includes: measuring the static data of the cables of the detector under test, comparing the static data with the preset standard values of the corresponding static data, and outputting static detection results. The preset standard values include the core-screen insulation resistance standard value, the screen-ground insulation resistance standard value, the inter-screen insulation resistance, the core-screen capacitance standard value, the coincidence degree standard value, and the dielectric constant standard value.

[0055] In some embodiments, the static test unit includes only one of an insulation test unit for performing insulation resistance tests, a capacitance test unit for performing capacitance tests, a reflection curve test unit for performing reflection curve tests, and a dielectric constant test unit for performing dielectric constant tests.

[0056] The insulation test unit is used to input a DC voltage to the detector cables, respectively measure the core-screen insulation resistance, screen-ground insulation resistance, and inter-screen insulation resistance of each cable, and continuously test each item for a preset time duration, compare the measured insulation resistance with the corresponding preset standard value, and output the insulation resistance test result in the static data test according to the comparison result. For example, when the core-screen insulation resistance is greater than the core-screen insulation resistance standard value, it is determined that the core-screen insulation resistance of the cable is qualified.

[0057] The capacitance test unit is used to respectively measure the core-screen capacitance of each cable, compare the core-screen capacitance of each cable with the core-screen capacitance standard value, and output the capacitance test result in the static data test according to the comparison result. For example, when the core-screen capacitance of the cable is greater than the core-screen capacitance standard value, it is determined that the core-screen capacitance of the cable is qualified.

[0058] The reflection curve test unit is used to perform impedance matching on the detector cable under test according to preset impedance parameters, conduct time-domain reflection tests, output the reflection curves of the corresponding cables, analyze the coincidence degree of each reflection curve, and output the reflection curve test results in the static detection results according to the analysis results. For example, when the coincidence degree between each reflection curve is greater than the coincidence degree standard value, it is determined that the time-domain reflection performance of the detector under test is qualified.

[0059] The dielectric constant test unit is used to test the dielectric constant of each cable according to the corresponding dielectric test voltage, compare the dielectric constant of each cable with the dielectric constant standard value, and output the dielectric constant test results in the static data test according to the comparison results. For example, when the dielectric constant of the cable is greater than the dielectric constant standard value, it is determined that the dielectric constant of the cable is qualified.

[0060] The noise test unit is used to perform background noise tests on the detector cable under test and output noise detection results.

[0061] Specifically, the process of the background noise test includes: measuring the output current of the signal output cable according to at least one set of preset input voltage parameters, comparing the output current with the preset noise standard value of the corresponding group, and outputting the noise detection results. For example, when the difference between the output current of a certain group and its corresponding preset noise standard value is less than the preset error value, it is determined that the background noise of this group meets the standard. In some embodiments, the groups of preset input voltage parameters include (+600V, -50V), (+600V, 0V), and (+600V, +200V).

[0062] The vibration test unit is used to perform vibration simulation tests on the detector cable under test and output vibration detection results.

[0063] In some embodiments, the vibration test unit includes a vibration reflection test unit and a mechanical vibration test unit.

[0064] Among them, the vibration reflection test unit is used to perform vibration reflection tests on the detector cable under test and output vibration reflection test results for characterizing the core connection status of the detector under test.

[0065] The working process of the vibration reflection test unit is as follows: perform at least one vibration amplification reflection test, and determine whether to perform at least one more vibration amplification reflection test according to the first vibration amplification reflection test result and the historical amplification reflection curve, and output the vibration reflection test results according to the vibration amplification reflection test results of each time and the historical amplification reflection curve. Among them, the vibration amplification reflection test includes inputting a first simulated vibration signal at a first preset position of the detector under test, and during the vibration process, performing a time-domain amplification reflection test, and the output amplified reflection curve is used as the vibration amplification reflection test result of this time. In addition, the first preset position includes the joints and the housing of the detector under test.

[0066] A mechanical vibration test unit is used to perform a mechanical vibration test on the cable of the detector under test and output a mechanical vibration test result for characterizing the connection status of the mechanical components of the detector under test. The vibration reflection test result and the mechanical vibration test result constitute the vibration detection result.

[0067] The working process of the mechanical vibration test unit is as follows: Input a second simulated vibration signal at the second preset position of the detector under test. During the vibration process, perform background noise testing and determine the noise detection result of the background noise test and the preset noise standard value to output the mechanical vibration test result. Among them, the second preset position includes at least one of a preset vibration point position, a cable joint, and a cable outlet.

[0068] A damage detection unit is used to perform a detection damage test on the cable of the detector under test and generate a damage detection result according to the test result and the static detection result.

[0069] In some embodiments, the detection damage test includes: After performing the static data test, noise detection, and vibration simulation test, perform an insulation resistance test again to determine whether the detector under test has been damaged or changed due to the test.

[0070] An evaluation unit is used to generate an evaluation result according to the static detection result, noise detection result, vibration detection result, and damage detection result. Specifically, issue a complete evaluation report according to each detection result, including displaying the process parameters and judgment results of each test.

[0071] It can be understood that the present invention realizes offline detection of the neutron detector by adopting a variety of test methods, and can effectively detect whether there are defects inside, whether the functions are abnormal, and whether the wiring connections are stable in the neutron detector before installation, so as to avoid discovering abnormalities after the neutron detector is installed on site as much as possible. Moreover, the judgment is fast and accurate, providing technical guarantee for the stable operation of the out-of-core neutron measurement system of the nuclear power plant.

[0072] It can be understood that the above embodiments only represent the preferred embodiments of the present invention, and the description is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent of the present invention; it should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, these technical features can be freely combined, and several deformations and improvements can also be made, which all belong to the protection scope of the present invention; therefore, all equivalent transformations and modifications made to the scope of the claims of the present invention shall fall within the scope covered by the claims of the present invention.

Claims

1. An off-line detection method for a neutron detector, characterized in that, Including: S10. Perform static data tests on the cable of the detector under test to generate static detection results. Among them, the static data tests include at least one of insulation resistance test, capacitance test, reflection curve test, and dielectric constant test; S20. Perform background noise tests on the cable of the detector under test to generate noise detection results; S30. Perform vibration simulation tests on the cable of the detector under test to generate vibration detection results; S40. Perform detection damage tests on the cable of the detector under test, and generate damage measurement results according to the test results and the static detection results; S50. Generate evaluation results according to the static detection results, noise detection results, vibration detection results, and damage measurement results; In the step S30, the vibration simulation tests include: performing vibration reflection tests on the cable of the detector under test to generate vibration reflection test results for characterizing the connection status of the wire cores of the detector under test; and performing mechanical vibration tests on the cable of the detector under test to generate mechanical vibration test results for characterizing the connection status of the mechanical components of the detector under test. The vibration reflection test results and the mechanical vibration test results constitute the vibration detection results; The vibration reflection tests include: performing at least one vibration amplification reflection test, and judging whether to perform at least one more vibration amplification reflection test according to the results of the first vibration amplification reflection test and the historical amplification reflection curve, and generating the vibration reflection test results according to the results of each vibration amplification reflection test and the historical amplification reflection curve. Among them, the vibration amplification reflection test includes inputting a first simulated vibration signal at a first preset position of the detector under test, and performing time-domain amplification reflection tests during the vibration process, and taking the obtained amplification reflection curve as the test result of this vibration amplification reflection test. The first preset position includes the joints and the housing of the detector under test; The mechanical vibration tests include: inputting a second simulated vibration signal at a second preset position of the detector under test, performing the background noise test during the vibration process, and judging the noise detection results of the background noise test and a preset noise standard value to generate the mechanical vibration test results. The second preset position includes at least one of a preset vibration point position, a cable joint, and a cable outlet, where the preset vibration point position is opposite to the internal connection point of the detector under test and is located on the outer shell; 2. The off-line detection method of the neutron detector according to claim 1, wherein In the step S10, the static data tests include: measuring the static data of the cable of the detector under test, comparing the static data with the preset standard values of the corresponding static data, and generating the static detection results; 3. The offline detection method for a neutron detector according to claim 1, wherein In the step S10, the reflection curve test includes: performing impedance matching on the cable of the detector under test according to preset impedance parameters, performing time-domain reflection tests, generating reflection curves of the corresponding cables, analyzing the coincidence degree of each reflection curve, and generating the reflection curve test results in the static detection results according to the coincidence degree analysis results; 4. The off-line detection method of the neutron detector according to claim 1, characterized in that, In the step S20, the background noise test includes: measuring the output current of the signal output cable according to at least one set of preset input voltage parameters, comparing the output current with the preset noise standard value of the corresponding group, and generating the noise detection result.

5. An offline detection system for a neutron detector, characterized in that, Including: A static test unit for performing static data tests on the cable of the detector under test and outputting static detection results; wherein, the static data test includes at least one of insulation resistance test, capacitance test, reflection curve test, and dielectric constant test; A noise test unit for performing background noise tests on the cable of the detector under test and outputting noise detection results; A vibration test unit for performing vibration simulation tests on the cable of the detector under test and outputting vibration detection results; A damage detection unit for performing damage detection tests on the cable of the detector under test and generating damage detection results according to the test results and the static detection results; An evaluation unit for generating evaluation results according to the static detection results, noise detection results, vibration detection results, and damage detection results; The vibration test unit includes: A vibration reflection test unit for performing vibration reflection tests on the cable of the detector under test and outputting vibration reflection test results for characterizing the connection status of the core of the detector under test, including: performing at least one vibration amplification reflection test, and judging whether to perform at least one more vibration amplification reflection test according to the first vibration amplification reflection test result and the historical amplification reflection curve, and generating the vibration reflection test results according to the vibration amplification reflection test results of each time and the historical amplification reflection curve; wherein, the vibration amplification reflection test includes inputting a first simulated vibration signal at a first preset position of the detector under test, and performing a time-domain amplification reflection test during the vibration process, and the obtained amplification reflection curve is used as the vibration amplification reflection test result of this time; the first preset position includes the joint and the housing of the detector under test; A mechanical vibration test unit for performing mechanical vibration tests on the cable of the detector under test and outputting mechanical vibration test results for characterizing the connection status of the mechanical components of the detector under test; wherein, the mechanical vibration test includes: inputting a second simulated vibration signal at a second preset position of the detector under test, performing the background noise test during the vibration process, and judging the noise detection result of the background noise test and the preset noise standard value to generate the mechanical vibration test results; the vibration reflection test results and the mechanical vibration test results constitute the vibration detection results; the second preset position includes at least one of a preset vibration point position, a cable joint, and a cable outlet, wherein the preset vibration point position is opposite to the internal connection point of the detector under test and is located on the outer shell.

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