Sensitivity detection device for eddy current sensor

Abstract

The invention discloses an eddy current sensor sensitivity detection device, and relates to the field of electric power safety instrument detection, and the device comprises a test disc which is located in front of a probe of an eddy current sensor and is used for automatically moving according to the scanning step length and the scanning point number so as to get close to or get away from the probe; and the sensitivity calculation module is connected with the output end of the eddy current sensor and is used for acquiring the output voltage of the eddy current sensor and calculating the sensitivity of the eddy current sensor according to the test distance between the test disc and the probe and the output voltage of the eddy current sensor corresponding to the test distance. Through automatic movement of the test disc, the sensitivity of the eddy current sensor is calculated according to the test distance between the test disc and the eddy current sensor probe and the output voltage of the eddy current sensor corresponding to different test distances, and automatic detection of the sensitivity of the eddy current sensor is realized.

Description

Technical Field

[0001] This application relates to the field of power safety instrument detection, and particularly to an eddy current sensor sensitivity detection device. Background Art

[0002] During the operation of TSI (Turbine Supervisory Instrumentation), the application and demand of eddy current sensors are relatively common and extensive. Eddy current sensors have a comprehensive range of models and specifications, featuring static and dynamic non-contact measurement characteristics, excellent characteristics for high linearity and high resolution measurement, and can meet the detection requirements of multiple items such as the main engine speed, vibration, axial displacement, differential expansion, rotor eccentricity, and thrust (support) bearing metal temperature of steam turbines, and can provide effective guarantees in the steam turbine monitoring and protection system, and are widely used in industries such as power, petroleum, chemical, and metallurgy.

[0003] The sensitivity of an eddy current sensor is used to measure the sensitivity of the eddy current sensor to changes in the measured physical quantity (usually displacement), and is one of the important indicators for evaluating the performance of an eddy current sensor. Generally, the sensitivity of the eddy current sensor is calculated using a formula through a linear detection method. The traditional detection methods are mostly manual operations: manually adjusting the positional relationship between the test disk and the eddy current sensor; manually adjusting the micrometer for distance measurement; manually measuring the voltage using a multimeter. After obtaining the distance data and the corresponding voltage data, the sensitivity is calculated. Currently, relevant manufacturers have researched and produced many types of detection equipment for eddy current sensors, but these equipment also mainly rely on manual operation and visual recording to complete, with low intelligence in data analysis and processing, a cumbersome detection process, and large influence of detection data by human factors. Taking a 660MW thermal power unit as an example, the number of eddy current sensors used is about 120. To ensure the accuracy of sensitivity calculation, it is generally necessary to synchronously test and record relevant data for the upstroke voltage and the downstroke voltage. The workload is large, manual data recording is required, there are certain errors in manual operation, and if the measured gap distance is exceeded, it is necessary to re-zero for measurement, which also leads to low production debugging efficiency. For the above reasons, it is necessary to develop a highly automated eddy current sensor sensitivity detection device. Summary of the Invention

[0004] The purpose of this application is to provide an eddy current sensor sensitivity detection device, which can automatically move the test disk, calculate the sensitivity of the eddy current sensor according to the test distance between the test disk and the probe of the eddy current sensor, and the output voltage of the eddy current sensor corresponding to different test distances, and realize the automatic detection of the sensitivity of the eddy current sensor.

[0005] To achieve the above object, the present application provides the following solutions:

[0006] The present application provides an eddy current sensor sensitivity detection device, including:

[0007] A test disk, located in front of the probe of the eddy current sensor, for automatically moving according to the scanning step and the number of scanning points to approach or move away from the probe;

[0008] A sensitivity calculation module, connected to the output end of the eddy current sensor, for obtaining the output voltage of the eddy current sensor and calculating the sensitivity of the eddy current sensor according to the test distance between the test disk and the probe and the output voltage of the eddy current sensor corresponding to the test distance.

[0009] Optionally, the eddy current sensor sensitivity detection device further includes:

[0010] A data storage module, in which models of various eddy current sensors are pre-stored.

[0011] Optionally, the number of scanning points is automatically generated according to the model of the eddy current sensor or generated by manual setting; the scanning step is automatically generated according to the model of the eddy current sensor and the number of scanning points.

[0012] Optionally, the sensitivity calculation module includes:

[0013] A data acquisition unit, connected to the output end of the eddy current sensor, for obtaining the output voltage of the eddy current sensor;

[0014] A distance calculation unit, for calculating the test distance according to the initial position of the test disk, the scanning step and the number of scanning points;

[0015] A data processing unit, connected to the data acquisition unit and the distance calculation unit, for calculating the sensitivity of the eddy current sensor according to the test distance and the output voltage of the eddy current sensor corresponding to the test distance through the following formula:

[0016]

[0017] where S is the sensitivity of the eddy current sensor; n is the number of scanning points; d i is the test distance between the test disk and the probe at the i-th scanning point; V i is the output voltage of the eddy current sensor corresponding to d i corresponding.

[0018] Optionally, the eddy current sensor sensitivity detection device further includes:

[0019] A driving module, connected to the test disk, is configured to control the automatic movement of the test disk according to the scanning step length and the number of scanning points, so as to move closer to or away from the probe.

[0020] Optionally, the test disk includes a housing and a ranging sensor. The ranging sensor is installed inside the housing and is configured to measure the actual movement distance of the test disk and send the actual movement distance to the driving module;

[0021] The driving module is further configured to control the movement of the test disk according to the actual movement distance.

[0022] Optionally, the ranging sensor is further configured to measure the test distance.

[0023] Optionally, the eddy current sensor sensitivity detection device further includes:

[0024] An interaction recognition module, configured to obtain the model and number of the eddy current sensor according to the picture or voice data input by the user.

[0025] Optionally, the eddy current sensor sensitivity detection device further includes:

[0026] An output module, connected to the sensitivity calculation module and the interaction recognition module, is configured to output a detection report; the detection report includes the model and number of the eddy current sensor, and the sensitivity.

[0027] Optionally, the eddy current sensor sensitivity detection device further includes:

[0028] A sensor bracket, configured to fix eddy current sensors of different models.

[0029] According to the specific embodiments provided by the present application, the following technical effects are disclosed in the present application:

[0030] The present application provides an eddy current sensor sensitivity detection device. By automatically moving the test disk, the distance between the test disk and the probe of the eddy current sensor is automatically changed; by automatically obtaining the test distance between the test disk and the probe of the eddy current sensor, and the output voltage of the eddy current sensor corresponding to different test distances, the sensitivity of the eddy current sensor can be calculated. The automatic detection of the sensitivity of the eddy current sensor is realized. Description of the Drawings

[0031] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required for use in the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0032] Figure 1 It is a schematic diagram of the functional modules of a sensitivity detection device for an eddy current sensor in an embodiment of the present application;

[0033] Figure 2 It is a schematic diagram of the overall structure of a sensitivity detection device for an eddy current sensor provided in an embodiment of the present application;

[0034] Figure 3 It is a schematic diagram of the sensor bracket structure of a sensitivity detection device for an eddy current sensor provided in an embodiment of the present application;

[0035] Figure 4 It is a schematic diagram of the functional modules of the main panel of a sensitivity detection device for an eddy current sensor provided in an embodiment of the present application.

[0036] Reference numerals: 101 - test disk, 102 - sensitivity calculation module, 201 - data storage module, 202 - drive module, 203 - interaction recognition module, 204 - output module, 205 - sensor bracket, 301 - fixing nut, 302 - sensor jacket, 303 - telescopic rod, 304 - test disk fixed end, 401 - body, 402 - power interface, 403 - panel wiring port, 404 - printer connection interface, 405 - PC computer connection port, 406 - liquid crystal display screen, 407 - touch pen. Detailed implementation manners

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0038] To make the above objects, features, and advantages of the present application more obvious and understandable, the present application will be further described in detail below with reference to the accompanying drawings and specific implementation manners.

[0039] In an exemplary embodiment, as Figure 1 shown, a sensitivity detection device for an eddy current sensor is provided, including a test disk 101 and a sensitivity calculation module 102.

[0040] Among them, the test disk 101 is located in front of the probe of the eddy current sensor. The test disk 101 is used to automatically move according to the scanning step and the number of scanning points to approach or move away from the probe.

[0041] The sensitivity calculation module 102 is connected to the output end of the eddy current sensor. The sensitivity calculation module 102 is used to obtain the output voltage of the eddy current sensor and calculate the sensitivity of the eddy current sensor according to the test distance between the test disk 101 and the probe and the output voltage of the eddy current sensor corresponding to the test distance.

[0042] In an exemplary embodiment, the sensitivity calculation module 102 includes a data acquisition unit 1021, a distance calculation unit 1022, and a data processing unit 1023.

[0043] Among them, the data acquisition unit 1021 is connected to the output end of the eddy current sensor and is used to obtain the output voltage of the eddy current sensor. The distance calculation unit 1022 is used to calculate the test distance between the test disk 101 and the probe according to the initial position of the test disk 101, the scanning step, and the number of scanning points. The data processing unit 1023 is connected to the data acquisition unit 1021 and the distance calculation unit 1022 and is used to calculate the sensitivity of the eddy current sensor according to the test distance between the test disk 101 and the probe and the output voltage of the eddy current sensor corresponding to the test distance through the following formula:

[0044]

[0045] Among them, S is the sensitivity of the eddy current sensor; n is the number of scanning points; d i is the test distance between the test disk and the probe at the i-th scanning point; V i is the output voltage of the eddy current sensor corresponding to d i corresponding thereto.

[0046] In an exemplary embodiment, such as Figure 2As shown, the eddy current sensor sensitivity detection device further includes a data storage module 201. In the data storage module 201, various models of eddy current sensors are pre-stored, as well as parameters such as the measuring range, nominal sensitivity, and rated gap corresponding to different models of eddy current sensors. The number of scan points for the movement of the test disk 101 is automatically generated according to the model of the eddy current sensor, or generated by manual setting. The scan step for the movement of the test disk 101 is automatically generated according to the model of the eddy current sensor and the number of scan points. For example, if the number of scan points is 8, the scan step is automatically set to 0.25 mm; if the number of scan points is 10, the scan step is automatically set to 0.2 mm. Taking the direction away from the eddy current sensor as the positive direction and the direction approaching the eddy current sensor as the negative direction. After the detection starts, the detection device automatically collects the output voltage of the eddy current sensor at fixed points according to the automatically generated scan step and the number of scan points. After the forward detection is completed, the reverse detection is automatically performed.

[0047] In another exemplary embodiment, as Figure 2 shown, the eddy current sensor sensitivity detection device further includes a driving module 202. The driving module 202 is connected to the test disk 101 and is used to control the automatic movement of the test disk 101 according to the scan step and the number of scan points to approach or move away from the probe of the eddy current sensor. The test disk 101 includes a housing 1011 and a ranging sensor 1012. The ranging sensor 1012 is installed inside the housing 1011 and is used to measure the actual moving distance of the test disk 101 and send the actual moving distance of the test disk 101 to the driving module 202. The driving module 202 is also used to control the movement of the test disk 101 according to the actual moving distance of the test disk 101. In another exemplary embodiment, the ranging sensor 1012 is also used to measure the test distance between the test disk 101 and the probe.

[0048] In another exemplary embodiment, as Figure 2 shown, the eddy current sensor sensitivity detection device further includes an interaction recognition module 203. The interaction recognition module 203 is used to obtain the model and number of the eddy current sensor according to the picture or voice data input by the user. The interaction recognition module 203 can receive the model and number of the eddy current sensor and the model of the preamplifier reported by taking pictures or manual voice, and convert the interaction information into text for recognition in the device, which is convenient for the operator to quickly issue a report. In another exemplary embodiment, as Figure 2 shown, the eddy current sensor sensitivity detection device further includes an output module 204, which is connected to the sensitivity calculation module 102 and the interaction recognition module 203 and is used to output a detection report. The detection report includes the model and number of the eddy current sensor, as well as the sensitivity of the eddy current sensor.

[0049] In another exemplary embodiment, as Figure 2As shown, the eddy current sensor sensitivity detection device further includes a sensor bracket 205 for fixing eddy current sensors of different models. In this embodiment, as Figure 3 shown, the sensor bracket 205 can fix the eddy current sensor and can also place the test disk 101. The sensor bracket 205 includes a fixing nut 301, a sensor jacket 302, a telescopic rod 303, and a test disk fixing end 304. The sensor bracket 205 cannot move, but different fixing nuts 301 and sensor jackets 302 can be replaced according to different eddy current sensors to be measured, so as to replace eddy current sensors of different models. To prevent affecting the detection result, when installing the eddy current sensor, try to keep the black head close to the measuring disk 101 (that is, expose the thread of the eddy current sensor as much as possible to the side of the measuring disk 101), and fix it with the fixing nut 301.

[0050] In an exemplary embodiment, as Figure 4 shown, the eddy current sensor sensitivity detection device further includes a main body 401, and a power interface 402, a panel wiring port 403, a printer connection interface 404, a PC computer connection port 405, a liquid crystal display screen 406, and a touch pen 407 provided on the main panel of the main body 401.

[0051] Among them, the panel wiring port 403 is used as the wiring port during the detection of the eddy current sensor. When starting the detection, the eddy current sensor system to be detected (preamplifier, extension cable, probe) should be reliably connected. Reliably connect the marked terminal position "VT" of the eddy current sensor preamplifier to the marked position "-24V" of the three-core green wiring terminal on the main panel of the main body 401; reliably connect the marked terminal position "COM" of the eddy current sensor preamplifier to the marked position "GND" of the three-core green wiring terminal on the main panel of the main body 401; reliably connect the marked terminal position "OUT" of the eddy current sensor preamplifier to the marked position "SGN" of the three-core green wiring terminal on the main panel of the main body 401.

[0052] The printer connection interface 404 is mainly used to connect a printer to print the detection data report online, which is convenient for forming the original record.

[0053] The PC computer connection port 405 can connect the device to the computer through a local area network. Since network connection settings are required, the user installs and runs the upper computer software before setting the lower computer, and connects the upper and lower computers with a network cable. Generally, the network parameters of the lower computer do not need to be modified and the default values of the lower computer can be used. The user only needs to modify the upper computer parameters accordingly.

[0054] The liquid crystal display screen 406 is for data display of the lower computer application software of the eddy current sensor sensitivity detection device. It includes five functional modules: system help, linear test, curve viewing, parameter setting, and display report. Its main function is to dynamically display human-machine interface elements, including the display of various operation command buttons on the touch screen, the real-time text display of sampled data, the display of analysis reports, the static curve plotting and display of various analysis data, etc. In the parameter setting interface, the user can select the type of eddy current sensor to be detected according to actual needs. The main parameters include: the probe diameter specification of the eddy current sensor, the output voltage range of the eddy current sensor, the standard sensitivity of the eddy current sensor, etc. The lower computer system will automatically set the static linear range scanning step size and the number of scanning points according to the type of eddy current sensor selected by the user. There are two buttons, forward test and reverse test, on the interface of the liquid crystal display screen 406. Clicking the forward test button can perform a forward test according to the set scanning step size and the number of scanning points. After the test is completed, clicking the reverse test button can perform a reverse test. When the test distance between the probe of the eddy current sensor and the test disc 101 is 0, the test ends. At this time, clicking the data viewing or curve viewing on the liquid crystal display screen 406 can view the test results and the error rate.

[0055] In an exemplary embodiment, the eddy current sensor sensitivity detection device further includes a toolbox and a USB interface. Commonly used pins, screwdrivers, fixing nut fittings, test wires, etc. are placed in the toolbox. The USB interface on the control panel is used to connect a USB flash drive for data output and reading, or to connect a mouse to control the eddy current sensor sensitivity detection device.

[0056] In an exemplary embodiment, the process of using the eddy current sensor sensitivity detection device provided by the present application to detect the sensitivity of an eddy current sensor is as follows:

[0057] (1) Connection of the detection circuit. Reliably connect the eddy current sensor system to be detected (preamplifier, extension cable, probe). Connect the terminal marked "VT" of the preamplifier reliably to the three-core green terminal marked "-24V" on the main panel of the body 401; connect the terminal marked "COM" of the preamplifier reliably to the three-core green terminal marked "GND" on the main panel of the body 401; connect the terminal marked "OUT" of the preamplifier reliably to the three-core green terminal marked "SGN" on the main panel of the body 401.

[0058] (2) Installation of the eddy current sensor to be detected. According to the different eddy current sensors, use different fixing nuts 301 to facilitate the replacement of the eddy current sensor. It should be noted that to prevent affecting the test, when installing the eddy current sensor, the black head should be as close as possible to the measurement disc 101 (that is, the thread of the eddy current sensor should be exposed as much as possible to the side of the measurement disc 101).

[0059] (3) Select "Parameter Setting" on the liquid crystal display screen 406, and set the static linear range scanning step size and the number of scanning points according to the model of the eddy current sensor or preamplifier to be measured. Before the test, the number of the eddy current sensor to be measured, the number of the preamplifier, the monitoring position, etc. can be input by voice input or pictures, or manually input, which is convenient for the later operators to issue test reports.

[0060] (4) Click the start button to start the detection. First, perform the positive direction detection, and detect according to the static linear range scanning step size and the number of scanning points. The driving module 202 controls the test disk 101 to automatically move forward / backward according to the scanning step size and the number of scanning points, realizing the automation of the static detection process. The system automatically calculates some parameters of the eddy current sensor to be detected. At this time, the detection data has been automatically saved in the memory of the lower computer. The lower computer can receive the control instructions sent by the upper computer, decode and execute them, and at the same time transmit data to the upper computer for real-time analysis, processing and storage of the data.

[0061] (5) Use the least squares method to calculate the sensitivity of the eddy current sensor to be measured. The least squares method finds the slope and intercept of the best-fit line by minimizing the sum of the squared errors between the data points and the fit line. For the eddy current sensor to be measured, the slope of the fit line is its sensitivity.

[0062] The equation of the fit line obtained from the detection data is: V = S*d + V0. Where S is the sensitivity of the eddy current sensor; V is the output voltage of the eddy current sensor; d is the test distance between the test disk and the probe; the intercept V0 is the output voltage of the eddy current sensor when d = 0.

[0063] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data need to comply with relevant regulations.

[0064] The databases involved in the various embodiments provided in this application may include at least one of a relational database and a non-relational database. The non-relational database may include a distributed database based on blockchain, etc., and is not limited thereto. The processors involved in the various embodiments provided in this application may be a general-purpose processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., and is not limited thereto.

[0065] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0066] Specific examples are used in this article to elaborate on the principles and implementation manners of this application. The description of the above embodiments is only used to help understand the method and its core idea of this application; at the same time, for those of ordinary skill in the art, according to the idea of this application, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation on this application.

Claims

1. An eddy current sensor sensitivity detection device, characterized in that The eddy current sensor sensitivity detection device includes: A test disk, located in front of the probe of the eddy current sensor, for automatically moving according to the scanning step length and the number of scanning points to approach or move away from the probe; A sensitivity calculation module, connected to the output end of the eddy current sensor, for obtaining the output voltage of the eddy current sensor and calculating the sensitivity of the eddy current sensor according to the test distance between the test disk and the probe and the output voltage of the eddy current sensor corresponding to the test distance.

2. The eddy current sensor sensitivity detection device according to claim 1, wherein, The eddy current sensor sensitivity detection device further includes: A data storage module, in which models of various eddy current sensors are pre-stored.

3. The eddy current sensor sensitivity detection device according to claim 2, characterized in that, The number of scanning points is automatically generated according to the model of the eddy current sensor or generated by manual setting; the scanning step length is automatically generated according to the model of the eddy current sensor and the number of scanning points.

4. The eddy current sensor sensitivity detection device according to claim 1, wherein The sensitivity calculation module includes: A data acquisition unit, connected to the output end of the eddy current sensor, for obtaining the output voltage of the eddy current sensor; A distance calculation unit, for calculating the test distance according to the initial position of the test disk, the scanning step length and the number of scanning points; A data processing unit, connected to the data acquisition unit and the distance calculation unit, for calculating the sensitivity of the eddy current sensor according to the test distance and the output voltage of the eddy current sensor corresponding to the test distance through the following formula: Where S is the sensitivity of the eddy current sensor; n is the number of scanning points; d i is the test distance between the test disk and the probe at the i-th scanning point; V i is the output voltage of the eddy current sensor corresponding to d i .

5. The eddy current sensor sensitivity detection device according to claim 1, characterized in that, The eddy current sensor sensitivity detection device further includes: A driving module, connected to the test disk, for controlling the test disk to automatically move to approach or move away from the probe according to the scanning step length and the number of scanning points.

6. The eddy current sensor sensitivity detection device according to claim 5, wherein, The test disk includes a housing and a ranging sensor. The ranging sensor is installed inside the housing. The ranging sensor is used to measure the actual moving distance of the test disk and send the actual moving distance to the driving module; The driving module is further used to control the movement of the test disk according to the actual moving distance.

7. The eddy current sensor sensitivity detection device according to claim 6, characterized in that, The ranging sensor is also used to measure the test distance.

8. The eddy current sensor sensitivity detection device according to claim 1, characterized in that, The eddy current sensor sensitivity detection device further includes: [[ID= 9. The eddy current sensor sensitivity detection device according to claim 8, characterized in that ​ ​ 10. The eddy current sensor sensitivity detection device according to claim 1, characterized in that, ​ ​

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