Ultrasonic flaw detector performance test system and test method

Abstract

The invention relates to the technical field of ultrasonic detection, in particular to a system and a method for testing the performance of an ultrasonic flaw detector. According to the technical scheme, the device comprises a main control device, an oscilloscope, a signal generator, an attenuator and a switching control device, wherein the switching control device is provided with an interface which is connected with the oscilloscope, the signal generator, the attenuator and a detected ultrasonic flaw detector; and the main control device is simultaneously in communication control connection with the oscilloscope, the signal generator, the attenuator, the switching control device and the detected ultrasonic flaw detector. The ultrasonic flaw detector testing device has the beneficial effects that the oscilloscope, the signal generator, the attenuator and the tested ultrasonic flaw detector are organically combined together by matching with the switching control device, so that the tested ultrasonic flaw detector can be automatically tested according to different testing standards, and a testing result is output; the test efficiency of the ultrasonic flaw detector can be effectively improved, and the test cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of ultrasonic testing, and in particular to an ultrasonic flaw detector performance testing system and a testing method. Background Art

[0002] Before leaving the factory and during use, ultrasonic flaw detectors are regularly tested for instrument performance every year or at other agreed-upon time intervals. This performance testing work has always been carried out manually, requiring the operator to have professional ultrasonic flaw detector operation skills, be familiar with the standards, and proficiently master the corresponding testing methods. Therefore, the test results are easily affected by the operator's experience and skill proficiency, and long-term investment in human resources is required for personnel training. In addition, the detection items of one instrument are numerous and complex, with problems such as slow detection speed and high labor cost, which have a great impact on the production and sales volume of products. Currently, the main standards for specifying the performance testing methods of industrial ultrasonic flaw detectors are the standards published by the International Organization for Standardization (ISO) - the European Committee for Standardization, EN ISO 22232 (full name "Non-destructive testing — Characterization and verification of ultrasonic test equipment"), EN 12668 (full name "Non-destructive testing — Characterization and verification of ultrasonic examination equipment") and the Chinese mechanical industry standard JB / T 10061 (full name "Technical conditions for ultrasonic flaw detectors"). The above standards stipulate the test methods, performance indicators and verification processes of ultrasonic flaw detectors to ensure the reliability, repeatability and comparability of test results. Their test methods are all through the standard signal input method (such as square wave, sine wave excitation), and the gain linearity of the ultrasonic flaw detector (referring to the linear relationship between the amplitude change of the instrument and the gain adjustment), amplitude linearity (referring to the relationship between the echo amplitude of the instrument and the actual reflector size), horizontal linearity (referring to the uniformity of the horizontal time base on the instrument display), noise level (referring to the background noise intensity generated by the instrument's electronic system) and other performances are detected. This test method will use detection equipment such as oscilloscopes, signal generators, and attenuators to detect the performance indicators of ultrasonic instruments. At present, when manually performing the detection items specified by the standard, due to the large number of detection items, it takes a long time to manually adjust parameters and verify, and it is difficult to meet the high-frequency detection requirements (taking the implementation of the EN ISO 22232 standard operation as an example, the manual detection of a conventional ultrasonic flaw detector takes 12 hours). And because the above standards need to frequently switch the connections and change the test parameters of the oscilloscope, signal generator, attenuator and the ultrasonic detector under test during the test process, it is very difficult to integrate the above test equipment to perform tests according to the standards. Summary of the Invention

[0003] The object of the present invention is to provide a test system and test method for ultrasonic flaw detectors, specifically to provide a test system and test method for ultrasonic flaw detectors that can automatically test the ultrasonic flaw detector under test according to different test standards and output test reports.

[0004] To achieve the above object, the present invention adopts the following technical solution: A performance testing system for an ultrasonic flaw detector, comprising a main control device, an oscilloscope, a signal generator, an attenuator, and a switching control device. The switching control device is provided with a transmitting end interface, a receiving end interface, an oscilloscope interface, a signal generator interface, and an attenuator interface. The oscilloscope interface of the switching control device is connected to the oscilloscope through a resistive load. The signal generator interface is connected to the signal input end of the signal generator. The signal output end of the signal generator is connected to the attenuator interface through a resistive load after passing through the attenuator. The signal output end of the signal generator is also connected to the oscilloscope. The transmitting end interface and the receiving end interface of the switching control device are respectively connected to the transmitting end and the receiving end of the ultrasonic flaw detector to be tested. The switching control device is used to control whether the transmitting end interface is connected to the oscilloscope interface or the signal generator interface, and at the same time to control whether the receiving end interface is connected to the attenuator interface. The main control device is communicatively connected to the oscilloscope, the signal generator, the attenuator, the switching control device, and the ultrasonic flaw detector to be tested at the same time.

[0005] When the above ultrasonic flaw detector testing system performs a transmitting performance test on the ultrasonic flaw detector to be tested, the main control device can control the switching control device to connect the transmitting end interface and the oscilloscope interface. The main control device can control the pulse signal emitted by the transmitting end of the ultrasonic flaw detector to be tested by connecting to the ultrasonic flaw detector to be tested and the oscilloscope, and read the corresponding actual signal waveform from the oscilloscope. When performing a receiving performance test on the ultrasonic flaw detector to be tested, the main control device controls the switching control device to connect the transmitting end interface to the signal generator interface and at the same time connect the receiving end interface to the attenuator interface. The signal generator can process and output the signal emitted by the transmitting end of the ultrasonic flaw detector to be tested, or output a corresponding pulse signal from its own waveform library. The signal emitted by the signal generator is input to the receiving end of the ultrasonic flaw detector to be tested through the attenuator and the resistive load, so as to simulate the entire process of the signal emitted by the transmitting end, the attenuation of the signal after entering the object to be detected, and the reception of the signal by the receiving end when the ultrasonic flaw detector to be tested is actually in use.

[0006] Specifically, the transmitting end interface of the switching control device is connected to the oscilloscope interface and the signal generator interface through relay switches respectively, and the receiving end interface is connected to the attenuator interface through a relay switch. A single-chip microcomputer is arranged in the switching control device and is connected to the relay switch for control. The main control device controls the switching control device by connecting to the single-chip microcomputer in the switching control device.

[0007] Specifically, the oscilloscope, the signal generator, the attenuator, and the ultrasonic flaw detector to be tested are all connected to the main control device through network cables.

[0008] Furthermore, it further includes an automatic switching device. Two multi-position selection switches are arranged in the automatic switching device. The fixed ends of the two multi-position selection switches are respectively connected to the transmitting end interface and the receiving end interface of the switching control device, and the multi-position selection ends of the two multi-position selection switches are respectively connected to the transmitting ends and receiving ends of multiple ultrasonic flaw detectors to be measured.

[0009] Specifically, a controller is arranged in the automatic switching device and is connected to the two multi-position selection switches for control. The main control device is connected to the controller of the automatic switching device to control the automatic switching device.

[0010] Specifically, the attenuator adopts a mechanical attenuator. A knob driving mechanism is arranged on each control knob of the mechanical attenuator. A knob controller is also arranged on the attenuator and is drivingly connected to the knob driving mechanism. The main control device controls the attenuator by communicating with the knob controller.

[0011] Specifically, a rotation detection encoder is further arranged above the control knob. The rotation detection encoder is used to detect the rotation angle of the control knob. The main control device obtains the rotation angle of the control knob of the attenuator by connecting with the rotation detection encoder.

[0012] Specifically, an automatic test software for executing the test process according to the test standard is arranged in the main control device. The automatic test software is communicatively connected to the oscilloscope, signal generator, attenuator, switching control device and ultrasonic flaw detector to be measured through the VISA library interface for control.

[0013] Among them, the automatic test software includes a detection management module, an automatic detection module and a system maintenance module. The detection management module includes functions such as detection project setting, detection item setting and report management, and is used to set different test processes according to different test standards; the automatic detection module includes functions such as detection project selection, project data modification, detection execution, detection result analysis and detection report generation, and is used to test the ultrasonic flaw detector to be measured according to the test processes of different standards and output a test result report; the system maintenance module includes functions such as ultrasonic instrument management, oscilloscope management, signal generator management, attenuator management and database management, and is used to manage devices such as ultrasonic flaw detectors, oscilloscopes, signal generators, attenuators and the collected data.

[0014] A method for testing the performance of an ultrasonic flaw detector uses the above-mentioned ultrasonic flaw detector performance test system to perform a transmitting performance test and a receiving performance test on the ultrasonic flaw detector to be measured:

[0015] ① For the emission performance test, the main control device controls the switching control device to connect the emission end interface with the oscilloscope interface, connects the emission end of the ultrasonic flaw detector under test with the emission end interface, and the main control device sets parameters for the ultrasonic flaw detector under test according to the test standard; during the test process, the main control device controls the ultrasonic flaw detector under test to emit corresponding pulse signals according to the requirements of the test standard, and the main control device obtains the waveforms of the ultrasonic flaw detector under test when emitting various pulse signals through the oscilloscope, and calculates the emission performance of the ultrasonic flaw detector under test based on this.

[0016] ② For the reception performance test, the main control device controls the switching control to connect the emission end interface with the signal generator interface, and the reception end interface with the attenuator interface. The emission end and the reception end of the ultrasonic flaw detector under test are respectively connected with the emission end interface and the reception end interface; the main control device sets parameters for the ultrasonic flaw detector under test according to the test standard. During the test process, the main control device controls the ultrasonic flaw detector under test to emit corresponding pulse signals according to the test standard. The pulse signals emitted by the ultrasonic flaw detector under test are transmitted to the signal input end of the signal generator. The main control device controls the signal generator to perform corresponding processing on the pulse signals emitted by the ultrasonic flaw detector under test or emit signals of a certain waveform, and then connect them to the reception end of the ultrasonic flaw detector under test through the attenuator after setting different attenuation values for the attenuator, and calculates the reception performance of the ultrasonic flaw detector under test by reading the received signals of the ultrasonic flaw detector under test.

[0017] The beneficial effects of the present invention are as follows: cooperating with the switching control device, the oscilloscope, the signal generator, the attenuator and the ultrasonic flaw detector under test are organically combined, and the ultrasonic flaw detector under test can be automatically tested according to different test standards and the test results can be output, which can effectively improve the test efficiency of the ultrasonic flaw detector and reduce the test cost. Description of the Drawings

[0018] Appendix Figure 1 It is the connection schematic diagram of a performance test system for an ultrasonic flaw detector in the embodiment;

[0019] Appendix Figure 2 It is the functional module framework diagram of the automatic test software in the embodiment;

[0020] Appendix Figure 3 It is the specific connection principle schematic diagram of the switching control device in the embodiment;

[0021] Appendix Figure 4 It is the specific connection principle schematic diagram of the automatic switching device in the embodiment;

[0022] Appendix Figure 5 It is the specific structure schematic diagram of the mechanical attenuator in the embodiment;

[0023] Appendix Figure 6Structural diagram showing the specific connection of a control knob of the mechanical attenuator in the embodiment to the knob driving mechanism and the rotation detection encoder;

[0024] Appendix Figure 7 Taking square wave pulses and spike pulses as examples, the measurement method of pulse voltage V 50 , pulse rise time t r , pulse width t d . Detailed implementation manners

[0025] Embodiment 1. Refer to Figure 1 , an ultrasonic flaw detector performance test system, including a main control device, an oscilloscope, a signal generator, an attenuator, and a switching control device. The switching control device is provided with a transmitting end interface, a receiving end interface, an oscilloscope interface, a signal generator interface, and an attenuator interface. The oscilloscope interface of the switching control device is connected to the oscilloscope through a resistive load. The signal generator interface is connected to the signal input end of the signal generator. The signal output end of the signal generator is connected to the attenuator interface through the attenuator and then through a resistive load. The signal output end of the signal generator is also connected to the oscilloscope. The transmitting end interface and the receiving end interface of the switching control device are respectively connected to the transmitting end and the receiving end of the ultrasonic flaw detector to be tested. The switching control device is used to control whether the transmitting end interface is connected to the oscilloscope interface or the signal generator interface, and at the same time is used to control whether the receiving end interface is connected to the attenuator interface. The main control device is communicatively and controllably connected to the oscilloscope, the signal generator, the attenuator, the switching control device, and the ultrasonic flaw detector to be tested.

[0026] In this embodiment, the main control device can be a computer. The oscilloscope, signal generator, attenuator, and the ultrasonic flaw detector under test are all connected to the main control device through network cables. Since there are multiple devices, the main control device is connected to the oscilloscope, signal generator, attenuator, and the ultrasonic flaw detector under test through a multi-network port switch. When testing the emission performance of the ultrasonic flaw detector under test, the main control device can control the switching control device to connect the emission end interface and the oscilloscope interface. The main control device can control the pulse signal emitted by the emission end of the ultrasonic flaw detector under test by connecting to the ultrasonic flaw detector under test and the oscilloscope, and read the corresponding actual signal waveform from the oscilloscope. When testing the reception performance of the ultrasonic flaw detector under test, the main control device controls the switching control device to connect the emission end interface to the signal generator interface (for the signal generator with sufficient signal types, the emission end interface may not need to be connected to the signal generator interface here). At the same time, the reception end interface is connected to the attenuator interface. The signal generator can process and output the signal emitted by the emission end of the ultrasonic flaw detector under test, or output the corresponding pulse signal from its own waveform library. The signal emitted by the signal generator is input to the reception end of the ultrasonic flaw detector under test through the attenuator and the resistive load to simulate the entire process of the signal emitted by the emission end of the ultrasonic flaw detector under test in actual use, the attenuation of the signal after entering the object under test, and the reception of the signal by the reception end. At the same time, an automatic test software for executing the test process according to the test standard is installed in the main control device. The automatic test software is communicatively connected to the oscilloscope, signal generator, attenuator, switching control device, and the ultrasonic flaw detector under test through the VISA library interface. The main control device can perform corresponding parameter control on the oscilloscope, signal generator, attenuator, switching control device, and the ultrasonic flaw detector under test and read data. Among them, as Figure 2 shown, the automatic test software can adopt the following specific structure: it includes a detection management module, an automatic detection module, and a system maintenance module. The detection management module includes detection project setting, detection item setting, and report management functions, and can set different test processes according to different test standards; the automatic detection module includes detection project selection, project data modification, detection execution, detection result analysis, and detection report generation functions, and can test the ultrasonic flaw detector under test according to the test processes of different standards and output the test result report; the system maintenance module includes ultrasonic instrument management, oscilloscope management, signal generator management, attenuator management, and database management functions, and can manage devices such as ultrasonic flaw detectors, oscilloscopes, signal generators, attenuators, etc. and the collected data.

[0027] Among them, in this embodiment, the transmitting end interface of the switching control device is connected to the oscilloscope interface and the signal generator interface through relay switches, respectively. The receiving end interface is connected to the attenuator interface through a relay switch. A single-chip microcomputer is arranged in the switching control device and is connected to the relay switch for control. The main control device controls the switching control device by connecting to the single-chip microcomputer in the switching control device. The main control device is communicatively connected to the single-chip microcomputer in the switching control device, and can use the single-chip microcomputer to control the on / off of the relay switch in the switching control device, so as to realize the automatic switching control of the transmission performance and reception performance tests of the ultrasonic flaw detector under test.

[0028] At the same time, since conventional programmable attenuators (i.e., attenuators that can be programmed and controlled) have problems such as insufficient accuracy and high-frequency signal distortion, and cannot meet the test requirements of the test standard, mechanical attenuators are used in manual tests to ensure the test effect. However, mechanical attenuators cannot achieve automatic control by computer programs. In order to achieve automatic control of the attenuator and ensure the test effect, the attenuator in this embodiment uses a mechanical attenuator, and a knob driving mechanism 2 is arranged on each control knob 1 of the mechanical attenuator, as Figures 5 - 6 shown. A knob controller is also arranged on the attenuator and is drivingly connected to the knob driving mechanism 2. The main control device realizes the automatic control of the attenuator by communicatively connecting to the knob controller. The conventional mechanical attenuator includes three control knobs 1, corresponding to the gear selection of ×10dB, ×1dB, and ×0.1dB respectively. Each control knob 1 is correspondingly provided with a knob driving mechanism 2, so that the attenuation value of the attenuator can be automatically adjusted through the knob driving mechanism 2.

[0029] Among them, the knob driving mechanism 2 can adopt the following structure: it includes a driving motor 21 and a transmission gear set 22. The driving motor 21 preferably adopts a stepping motor. The transmission gear set 22 is composed of two meshing bevel gears. One of the bevel gears is fixedly connected to the output shaft of the driving motor 21, and the other bevel gear is fixedly connected to the control knob. The knob controller drives the driving motor 21 to rotate the control knob 1, so as to realize the control of the attenuation value of the mechanical attenuator by the main control device. In addition, a rotation detection encoder 3 is also arranged above the control knob 1. The rotation detection encoder 3 is used to detect the rotation angle of the control knob 1. The main control device obtains the rotation angle of the control knob 1 of the attenuator by connecting to the rotation detection encoder 3, so as to determine the attenuation value of the mechanical attenuator.

[0030] In a further embodiment, since the devices used in the transmission performance test and the reception performance test of the ultrasonic flaw detector do not conflict with each other, in order to simultaneously test multiple ultrasonic flaw detectors, an automatic switching device is further included. Two groups of multi-position selection switches are arranged in the automatic switching device. The fixed ends of the two groups of multi-position selection switches are respectively connected to the transmission end interface and the reception end interface of the switching control device. The multi-position selection ends of the two groups of multi-position selection switches are respectively connected to the transmission ends and reception ends of multiple ultrasonic flaw detectors to be tested. A controller is arranged in the automatic switching device and is connected to the two groups of multi-position selection switches for control. The main control device is connected to the controller of the automatic switching device to control the automatic switching device, so that the transmission ends and reception ends of different ultrasonic flaw detectors to be tested can be connected to the transmission end interface and the reception end interface of the switching control device. Thus, it is not necessary to frequently disassemble and assemble the ultrasonic flaw detector, and multiple ultrasonic flaw detectors can be tested simultaneously.

[0031] Meanwhile, this embodiment also provides a method for testing the performance of an ultrasonic flaw detector, which uses the above ultrasonic flaw detector performance test system to perform a transmission performance test and a reception performance test on the ultrasonic flaw detector to be tested:

[0032] ① Transmission performance test: The main control device controls the connection between the transmission end interface of the switching control device and the oscilloscope interface, connects the transmission end of the ultrasonic flaw detector to be tested to the transmission end interface, and the main control device sets parameters for the ultrasonic flaw detector to be tested according to the test standard; during the test process, the main control device controls the ultrasonic flaw detector to be tested to emit corresponding pulse signals according to the requirements of the test standard, and the main control device obtains the waveforms of the ultrasonic flaw detector to be tested when emitting various pulse signals through the oscilloscope, and calculates the transmission performance of the ultrasonic flaw detector to be tested based on this.

[0033] ② Reception performance test: The main control device controls the connection between the transmission end interface of the switching control and the signal generator interface, and the reception end interface and the attenuator interface. The transmission end and the reception end of the ultrasonic flaw detector to be tested are respectively connected to the transmission end interface and the reception end interface; the main control device sets parameters for the ultrasonic flaw detector to be tested according to the test standard. During the test process, the main control device controls the ultrasonic flaw detector to be tested to emit corresponding pulse signals according to the test standard. The pulse signals emitted by the ultrasonic flaw detector to be tested are sent to the signal input end of the signal generator. The main control device controls the signal generator to perform corresponding processing on the pulse signals emitted by the ultrasonic flaw detector or emit signals of a certain waveform, and then connect them to the reception end of the ultrasonic flaw detector through the attenuator. At the same time, the main control device controls the attenuator to be set to different attenuation values, and calculates the reception performance of the ultrasonic flaw detector to be tested by reading the received signals of the ultrasonic flaw detector.

[0034] Taking the EN ISO 22232 standard as an example, this embodiment provides the following specific test procedures to further illustrate the above test method:

[0035] ① Transmitting performance test: The main control device controls the switching of the transmitting end interface of the control device to be connected to the oscilloscope interface, and connects the transmitting end of the ultrasonic flaw detector under test to the transmitting end interface. The main control device controls the ultrasonic flaw detector under test to perform the factory reset operation in sequence, set it to the dual-probe mode, add and select the transmitting pulse parameters of the instrument (such as combinations of transmitting voltage 200V, pulse width 200ns, damping 1000, etc.), and measure the pulse voltage V of the instrument under test at the maximum and minimum repetition frequencies according to the pulse signal data read from the oscilloscope 50 、pulse rise time t r 、pulse width t d , Figure 4 Taking the square wave pulse and the spike pulse as examples, the measurement methods of the pulse voltage V 50 、pulse rise time t r 、pulse width t d are as follows. And the final pulse rise time t’ r needs to consider the inherent rise time t r of the oscilloscope on the basis of the measured value t s and is calculated according to the following formula: t’ r 2 =t r 2 -t s 2 ,and the reference value of t s is 1.1ns.

[0036] ② Receiving performance test: The main control device controls the switching of the transmitting end interface of the control to be connected to the signal generator interface, and the receiving end interface to be connected to the attenuator interface. The transmitting end and the receiving end of the ultrasonic flaw detector under test are respectively connected to the transmitting end interface and the receiving end interface. The main control device controls the ultrasonic flaw detector under test to perform the factory reset operation, set it to the dual-probe mode, and set the frequency band (unit: MHz) to be detected of the ultrasonic flaw detector under test. And the test is carried out according to the following procedures:

[0037] (1)The main control device controls the signal generator to output a sine wave of 5 cycles with a peak-to-peak voltage of ±1V at its signal output end.

[0038] (2)The main control device controls the attenuator to be adjusted to 9dB and adjusts the output frequency of the signal generator to make the maximum signal amplitude displayed on the screen of the ultrasonic flaw detector under test, and record the frequency f max of the signal generator at this time.

[0039] (3) The main control device adjusts the gain parameter of the ultrasonic flaw detector under test to make the signal amplitude displayed on the screen 80% of the full-screen amplitude, and then controls the attenuator to decrease by 3 dB. Respectively increase and decrease the frequency, and record the frequency when the signal displayed by the ultrasonic flaw detector under test returns to 80% of the full-screen amplitude as the upper limit frequency value f max and the lower limit frequency value f u . Then calculate and record the center frequency f l = (f o + f u ) / 2, and then calculate and record the bandwidth Δf = f l - f u - f l .

[0040] (4) The main control device controls the ultrasonic flaw detector under test to restore the factory settings again and set it to the dual-probe mode; then controls the signal generator to output a sine wave signal with an amplitude of 5 V and a frequency of the center frequency f o in step (3). Then set the gain of the ultrasonic flaw detector under test to the maximum value (110 dB), and then disconnect the receiving end interface from the attenuator interface through the switching control device, record the noise level on the display screen of the ultrasonic flaw detector under test, then set the gain of the ultrasonic flaw detector under test to 70 dB, control the switching control device to reconnect the attenuator interface to the receiving end interface, set the attenuator to 40 dB, and adjust the output level of the signal generator until the level of the radio frequency signal of the ultrasonic flaw detector under test is the same as the amplitude of the previous noise level; at this time, record the peak-to-peak voltage V in output by the signal generator through the oscilloscope, and calculate the equivalent input noise V ein = V in / 10000 and the noise n in per square root bandwidth = V ein / (f u - f l ) 1 / 2 .

[0041] (5) Keep the signal voltage output by the signal generator in (4) unchanged. In the range of 0 - 110 dB, increase the gain parameter of the ultrasonic flaw detector under test in 1 dB increments. After each adjustment of the gain parameter, adjust the attenuator to make the signal amplitude on the display screen of the ultrasonic flaw detector under test 80% of the full - screen amplitude, and record the deviation value between the increment of the gain parameter increased by 1 dB each time and the adjustment increment of the attenuator. Then, still keep the signal voltage output by the signal generator in (4) unchanged. In the range of 0 - 110 dB, starting from 0 dB, 20 dB, 40 dB, 60 dB, 80 dB, 90 dB respectively, increase the gain parameter of the ultrasonic flaw detector under test in 20 dB increments. After each adjustment of the gain parameter, adjust the attenuator to make the signal amplitude on the display screen of the ultrasonic flaw detector under test return to 80% of the full - screen amplitude, and record the deviation value between the increment of the gain parameter increased by 20 dB each time and the adjustment increment of the attenuator. Finally, still keep the signal voltage output by the signal generator in (4) unchanged. In the range of 0 - 110 dB, starting from 0 dB, 20 dB, 30 dB, 40 dB, 50 dB respectively, increase the gain parameter of the ultrasonic flaw detector under test in 60 dB increments. After each adjustment of the gain parameter, adjust the attenuator to make the signal amplitude on the display screen of the ultrasonic flaw detector under test return to 80% of the full - screen amplitude, and record the deviation value between the increment of the gain parameter increased by 60 dB each time and the adjustment increment of the attenuator. The deviation values recorded after the above three operations are judged according to the following criteria:

[0042] In any continuous 1 dB range, the maximum allowable value of the deviation is ±0.5 dB; in any continuous 20 dB range, the maximum allowable value of the deviation is ±1 dB; in any continuous 60 dB range, the maximum allowable value of the deviation is ±2 dB.

[0043] (6) The main control device adjusts the attenuator to 2 dB, and controls the output voltage of the signal generator or adjusts the gain parameter of the ultrasonic flaw detector under test to make the signal amplitude displayed on the display screen of the ultrasonic flaw detector under test 80% of the full - screen amplitude. Then, set the attenuator to 0, 1, 2, 4, 6, 8, 12, 14, 20, 26 dB respectively, and record the percentage of the signal amplitude displayed on the display screen of the ultrasonic flaw detector under test in the full - screen amplitude respectively.

[0044] (7) Finally, organize the test results recorded in the above steps (2) - (6) according to the standard requirements and output a test report.

[0045] The test method flow for EN12668 and JB / T 10061 standards is the same as the above - mentioned test flow for EN ISO 22232 standard. The only difference is that the calculation formulas are different, and the detection items are increased or decreased. The differences in the calculation formulas are shown in the following table:

[0046]

[0047] Certainly, the above is only a preferred embodiment of the present invention, and does not limit the scope of use of the present invention. Therefore, all equivalent changes made on the principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An ultrasonic flaw detector performance testing system, comprising an oscilloscope, a signal generator and an attenuator, characterized in that: It further includes a main control device and a switching control device. The switching control device is provided with a transmitting end interface, a receiving end interface, an oscilloscope interface, a signal generator interface, and an attenuator interface. The oscilloscope interface of the switching control device is connected to an oscilloscope through a resistive load. The signal generator interface is connected to the signal input end of a signal generator. The signal output end of the signal generator is connected to the attenuator interface through an attenuator and a resistive load. The signal output end of the signal generator is also connected to the oscilloscope. The transmitting end interface and the receiving end interface of the switching control device are respectively connected to the transmitting end and the receiving end of the ultrasonic flaw detector under test. The switching control device is used to control whether the transmitting end interface is connected to the oscilloscope interface or the signal generator interface, and at the same time to control whether the receiving end interface is connected to the attenuator interface. The main control device is communicatively connected to the oscilloscope, the signal generator, the attenuator, the switching control device, and the ultrasonic flaw detector under test for control.

2. The performance testing system for an ultrasonic flaw detector according to claim 1, wherein: The transmitting end interface of the switching control device is connected to the oscilloscope interface and the signal generator interface through relay switches respectively. The receiving end interface is connected to the attenuator interface through a relay switch. A single-chip microcomputer is arranged in the switching control device and is connected to the relay switch for control. The main control device controls the switching control device by connecting to the single-chip microcomputer in the switching control device.

3. The performance testing system of an ultrasonic flaw detector according to claim 1, wherein: It further includes an automatic switching device. Two groups of multi-position selection switches are arranged in the automatic switching device. The fixed ends of the two groups of multi-position selection switches are respectively connected to the transmitting end interface and the receiving end interface of the switching control device. The multi-position selection ends of the two groups of multi-position selection switches are respectively connected to the transmitting ends and the receiving ends of multiple ultrasonic flaw detectors under test.

4. The performance testing system for an ultrasonic flaw detector according to claim 3, characterized in that: A controller is arranged in the automatic switching device and is connected to the two groups of multi-position selection switches for control. The main control device is connected to the controller of the automatic switching device to control the automatic switching device.

5. The performance testing system for an ultrasonic flaw detector according to claim 1, wherein: The attenuator adopts a mechanical attenuator. A knob driving mechanism is arranged on each control knob of the mechanical attenuator. A knob controller is also arranged on the attenuator and is drivingly connected to the knob driving mechanism. The main control device controls the attenuator by communicatively connecting to the knob controller.

6. The performance testing system for an ultrasonic flaw detector according to claim 5, characterized in that: A rotation detection encoder is further arranged above the control knob. The rotation detection encoder is used to detect the rotation angle of the control knob. The main control device obtains the rotation angle of the control knob of the attenuator by connecting to the rotation detection encoder.

7. The performance testing system of an ultrasonic flaw detector according to claim 1, wherein: An automatic test software for executing the test process according to the test standard is arranged in the main control device. The automatic test software is communicatively connected to the oscilloscope, the signal generator, the attenuator, the switching control device, and the ultrasonic flaw detector under test through the VISA library interface for control.

8. The performance testing system of an ultrasonic flaw detector according to claim 7, characterized in that: The automatic test software includes a detection management module, an automatic detection module, and a system maintenance module. The detection management module includes functions such as detection project setting, detection item setting, and report management, and is used to set different test processes according to different test standards; the automatic detection module includes functions such as detection project selection, project data modification, detection execution, detection result analysis, and detection report generation, and is used to test the ultrasonic flaw detector under test according to the test processes of different standards and output a test result report; the system maintenance module includes functions such as ultrasonic instrument management, oscilloscope management, signal generator management, attenuator management, and database management, and is used to manage devices such as ultrasonic flaw detectors, oscilloscopes, signal generators, attenuators, and the collected data.

9. A method for testing the performance of an ultrasonic flaw detector, characterized in that: Use a performance test system for an ultrasonic flaw detector as described in any one of claims 1-8 to perform a transmission performance test and a reception performance test on the ultrasonic flaw detector under test: ① Transmission performance test: The main control device controls the switching control device so that the transmission end interface is connected to the oscilloscope interface, and the transmission end of the ultrasonic flaw detector under test is connected to the transmission end interface. The main control device sets parameters for the ultrasonic flaw detector under test according to the test standard; during the test process, the main control device controls the ultrasonic flaw detector under test to emit corresponding pulse signals according to the requirements of the test standard. The main control device obtains the waveforms of the ultrasonic flaw detector under test when emitting various pulse signals through the oscilloscope, and calculates the transmission performance of the ultrasonic flaw detector under test based on this. ② Reception performance test: The main control device controls the switching control so that the transmission end interface is connected to the signal generator interface, and the reception end interface is connected to the attenuator interface. The transmission end and the reception end of the ultrasonic flaw detector under test are respectively connected to the transmission end interface and the reception end interface; the main control device sets parameters for the ultrasonic flaw detector under test according to the test standard. During the test process, the main control device controls the ultrasonic flaw detector under test to emit corresponding pulse signals according to the test standard. The pulse signals emitted by the ultrasonic flaw detector under test are sent to the signal input end of the signal generator. The main control device controls the signal generator to perform corresponding processing on the pulse signals emitted by the ultrasonic flaw detector under test or emit signals of a certain waveform, and then connect them to the reception end of the ultrasonic flaw detector under test through the attenuator after passing through the attenuator. At the same time, the attenuator is controlled to be set to different attenuation values, and the reception performance of the ultrasonic flaw detector under test is calculated by reading the received signals of the ultrasonic flaw detector under test.

Images