CN110794268A - Steep wave discharge synchronous observation method and system - Google Patents
Steep wave discharge synchronous observation method and system Download PDFInfo
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- CN110794268A CN110794268A CN201911075869.1A CN201911075869A CN110794268A CN 110794268 A CN110794268 A CN 110794268A CN 201911075869 A CN201911075869 A CN 201911075869A CN 110794268 A CN110794268 A CN 110794268A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1245—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of line insulators or spacers, e.g. ceramic overhead line cap insulators; of insulators in HV bushings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1218—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing using optical methods; using charged particle, e.g. electron, beams or X-rays
Abstract
A steep wave discharge synchronous observation method and system specifically comprise: the device comprises a trigger signal output module, a delay pulse generator, a discharge loop and an observation loop; the trigger signal output module is used for outputting a test trigger signal; the delay pulse generator is respectively connected with the trigger signal output module, the discharge loop and the observation loop and is used for calculating and obtaining the time delay between the shooting of the observation loop on the to-be-tested sample and the control of the discharge loop on the to-be-tested sample to generate the discharge voltage waveform according to the test trigger signal; generating an impact trigger signal and a shooting signal according to the time delay; the discharging loop is connected with the time delay pulse generator and used for discharging at two ends of the to-be-tested sample according to the impact trigger signal to generate a discharging voltage waveform; the observation loop is connected with the delay pulse generator and used for synchronously acquiring observation image data corresponding to the discharge voltage waveform of the to-be-detected sample when the two ends of the to-be-detected sample are discharged according to the shooting signal.
Description
Technical Field
The invention relates to the field of electromechanical detection, in particular to a steep wave discharge synchronous observation system and a method.
Background
The steep wave test is a test method which can effectively eliminate the internal defects of the insulator and detect the tolerance performance of the insulator under high-gradient lightning waves, and the tolerance performance of the insulator under the steep wave impact test can be used as an important index for evaluating the quality of the insulator. In order to ensure that the disc insulator has excellent anti-pollution flashover performance while keeping high mechanical strength, the large-tonnage insulator coated with the RTV coating is widely applied to AC and DC high-voltage lines. However, in tests, it is unexpectedly found that after the RTV coating is coated, the steep wave test passing rate of the disc-shaped insulator with tonnage of 160kN, 210kN and the like is reduced from 100% to only 70%, and the test passing rate of the disc-shaped insulator with large tonnage of 550kN and the like is only about 50%. At present, the phenomenon can not be explained correspondingly, and the mechanism is lack. The insulation in the insulator does not change before and after coating the RTV, and the reduction of the steep wave test passing rate does not seem to be attributed to the reduction of the insulation performance in the insulator. To explain and solve this problem, the characteristics of the discharge at the steep wave first need to be studied in depth.
At present, the development process of the streamer discharge has been studied to a certain extent, but the related research is less for the discharge phenomenon under the impact of the steep wave and the breakdown discharge process of the insulator, which is an insulating structure with an extremely uneven field, under the steep wave. For the observation of discharge, researchers have proposed observation using high-speed photography; however, the main reason why the conventional observation means cannot observe the steep discharge is that the development process of the steep discharge is very rapid, the wave head time is only 100-200 ns, and the fastest frame of the conventional high-speed photography is 1 μ s, so that the discharge process cannot be analyzed. At present, the ICCD super-high speed camera can achieve that the shortest exposure time of each frame is 3ns, the minimum frame interval is 0ns, and capture of a steep wave discharge process can be realized. However, the ICCD cannot realize the post-trigger mode (the camera cyclically shoots, n pictures before the trigger time remain after triggering), and there is a certain time delay from triggering to shooting, so that it is not possible to take a signal from the discharge loop to trigger the camera to operate (the discharge process is very fast, the delay time from triggering to shooting is longer than the discharge time, the signal is taken from the loop to trigger the camera, and the discharge is already finished when the camera is exposed), and it is very difficult to realize the correspondence between the discharge time and the camera exposure time. And the measurement result of the discharge voltage waveform and the observation picture have no effective method for realizing accurate correspondence.
Disclosure of Invention
The invention aims to provide a steep wave discharge synchronous observation system and a method for filling the blank of steep wave discharge observation, realizing synchronous correspondence of an observed image and a voltage waveform and providing a test platform for research of a steep wave discharge process and mechanism, respectively triggering a steep wave generating device and an ICCD camera by utilizing two paths of signals, realizing capture shooting of the discharge process and obtaining a discharge waveform and an observed photo by calculating the propagation time of a light path and a circuit signal.
To achieve the above object, the steep-wave discharge synchronous observation system provided by the present invention specifically comprises: the device comprises a trigger signal output module, a delay pulse generator, a discharge loop and an observation loop; the trigger signal output module is used for outputting a test trigger signal; the delay pulse generator is respectively connected with the trigger signal output module, the discharge loop and the observation loop and is used for calculating and obtaining the time delay between the shooting of the sample to be tested by the observation loop and the generation of the discharge voltage waveform of the sample to be tested by the discharge loop according to the test trigger signal; generating an impact trigger signal and a shooting signal according to the time delay; the discharging loop is connected with the time delay pulse generator and used for discharging at two ends of a to-be-tested sample according to the impact trigger signal to generate a discharging voltage waveform; and the observation loop is connected with the time delay pulse generator and is used for synchronously acquiring observation image data corresponding to the discharge voltage waveform of the to-be-detected sample when the two ends of the to-be-detected sample are discharged according to the shooting signal.
In the above steep wave discharge synchronous observation system, preferably, the delay pulse generator further includes a discharge delay calculation module, a shooting delay calculation module, and a comparison module; the discharge time delay calculation module is used for calculating the discharge control time used between the trigger signal output module outputting the test trigger signal and the discharge loop controlling the discharge voltage waveform generated by the to-be-tested sample; the shooting time delay calculation module is used for calculating shooting control time used by the trigger signal output module to output the test trigger signal until the observation loop shoots the to-be-tested sample; the comparison module is used for obtaining time delay between the discharge control time and the shooting control time according to comparison of the discharge control time and the shooting control time, generating an impact trigger signal and a shooting signal according to the time delay, and enabling the to-be-tested sample to generate a discharge voltage waveform to be shot by the observation loop at the same time.
In the above steep-wave discharge synchronous observation system, preferably, the discharge circuit includes: the device comprises a third time delay calculating unit, a fourth time delay calculating unit and a fifth time delay calculating unit; the third time delay calculating unit is used for acquiring a third time delay of the impact trigger signal generated by the time delay pulse generator according to the test trigger signal; the fourth time delay calculating unit is used for obtaining a fourth time delay according to the difference value between the time of the time delay pulse generator outputting the impact trigger signal and the time of the discharging loop receiving the impact trigger signal; the fifth time delay calculating unit is used for obtaining a fifth time delay according to the discharge delay time of the discharge loop; and obtaining the discharge control time according to the sum of the third time delay, the fourth time delay and the fifth time delay.
In the above steep-wave discharge synchronous observation system, preferably, the observation circuit includes: the device comprises a first time delay calculating unit, a second time delay calculating unit and a sixth time delay calculating unit; the first time delay calculating unit is used for obtaining a first time delay according to the difference value of the output time of the test trigger signal and the time of the observation loop receiving the shooting signal; the second time delay calculating unit is used for obtaining a second time delay according to the exposure action time of the shooting unit in the observation loop; the sixth time delay calculating unit is used for obtaining a sixth time delay according to the time for the light to be transmitted from the to-be-tested sample to the shooting unit; and acquiring shooting control time according to the sum of the first time delay, the second time delay and the sixth time delay.
In the above steep-wave discharge synchronous observation system, preferably, the discharge circuit includes a surge voltage generator, a surge voltage conversion device, and a conduction circuit; the conduction circuit is connected with the delay pulse generator and is used for photoelectrically converting an impact trigger signal output by the delay pulse generator and outputting the impact trigger signal to the impact voltage generator; the impulse voltage generator is connected with the time delay pulse generator through the conduction circuit and used for controlling the impulse voltage to be subjected to assembling at two ends of the to-be-tested sample to discharge according to the impulse trigger signal to generate a discharge voltage waveform.
In the above steep wave discharge synchronous observation system, preferably, the observation loop includes an ICCD camera, an oscilloscope, and a resistor divider; the ICCD camera is connected with the time delay pulse generator and is used for synchronously acquiring observation image data corresponding to the discharge voltage waveform of the to-be-detected sample when the two ends of the to-be-detected sample are discharged according to the shooting signal; one end of a measurement channel of the oscilloscope is connected with the delay pulse generator, and the other end of the measurement channel is connected with the resistance voltage divider for obtaining a voltage waveform; one end of the resistance voltage divider is connected with the impulse voltage transubscription device, and the other end of the resistance voltage divider is connected with a measurement channel of the oscilloscope, and the resistance voltage divider is used for converting steep wave voltage output by the impulse voltage transubscription device into a low-voltage signal and then outputting the low-voltage signal to the oscilloscope.
In the above steep wave discharge synchronous observation system, preferably, the delay pulse generator is a DG535 four-channel digital delay pulse generator.
The invention also provides a steep wave discharge synchronous observation method, which comprises the following steps: according to the received test trigger signal, obtaining a difference value between the time of shooting the to-be-tested sample by the observation loop and the time of controlling the to-be-tested sample to generate a discharge voltage waveform by the discharge loop; respectively generating an impact trigger signal and a shooting signal through a delay pulse generator according to the difference value; and controlling the observation loop to synchronously acquire observation image data corresponding to the discharge voltage waveform of the to-be-detected sample when the discharge loop discharges at two ends of the to-be-detected sample according to the impact trigger signal and the shooting signal.
In the above steep wave discharge synchronous observation method, preferably, the obtaining a difference between a time when the observation loop shoots the to-be-tested object and a time when the discharge loop controls the to-be-tested object to generate the discharge voltage waveform according to the received test trigger signal includes: obtaining discharge control time according to the time from receiving a test trigger signal to the discharge loop to control the discharge voltage waveform generated by the to-be-tested sample; acquiring shooting control time according to the time from receiving the test trigger signal to shooting the to-be-tested sample by the observation loop; and comparing the discharge control time with the shooting control time to obtain time delay between the discharge control time and the shooting control time, generating an impact trigger signal and a shooting signal according to the time delay, and enabling the test sample to be tested to generate a discharge voltage waveform and be shot by the observation loop at the same time.
In the steep-wave discharge synchronous observation method, it is preferable that the discharge control time includes a third time delay, a fourth time delay, and a fifth time delay; the third time delay is the time for generating the impact trigger signal by the time delay pulse generator according to the test trigger signal; the fourth time delay is the difference value between the time of the time delay pulse generator outputting the impact trigger signal and the time of the discharge loop receiving the impact trigger signal; the fifth time delay is the discharge delay time of the discharge loop.
In the above steep-wave discharge synchronous observation method, preferably, the imaging control time includes: a first time delay, a second time delay and a sixth time delay; the first time delay is the difference time of the output time of the test trigger signal and the time of the observation loop receiving the shooting signal; the second time delay is based on the exposure action time of the shooting unit in the observation loop; the sixth time delay is the time taken for light to be transmitted from the sample to be tested to the shooting unit.
The invention also provides a computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method when executing the computer program.
The present invention also provides a computer-readable storage medium storing a computer program for executing the above method.
The steep wave discharge synchronous observation system and the method provided by the invention are not only suitable for capturing the steep wave discharge process, but also can be applied to the shock discharge processes of lightning waves, operating waves and the like; the device can effectively realize synchronous correspondence of observation images and voltage waveforms, and provides a test platform for research of steep wave discharge process and mechanism.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a schematic structural diagram of a steep wave discharge synchronous observation system provided by the present invention;
fig. 2 is a schematic structural diagram of a steep-wave discharge synchronous observation system according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a steep-wave discharge synchronous observation system according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a steep-wave discharge synchronous observation system according to an embodiment of the present invention;
FIG. 5 is a schematic flow chart of a method for synchronously observing steep-wave discharge according to the present invention;
fig. 6 is a schematic timing logic diagram of a steep wave discharge synchronous observation method according to an embodiment of the present invention;
fig. 7A to 7E are schematic views of discharge photographs and corresponding waveforms according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the present invention is described in further detail below with reference to the embodiments and the accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
Referring to fig. 1, the steep discharge synchronous observation system provided by the present invention specifically includes: the device comprises a trigger signal output module, a delay pulse generator, a discharge loop and an observation loop; the trigger signal output module is used for outputting a test trigger signal; the delay pulse generator is respectively connected with the trigger signal output module, the discharge loop and the observation loop and is used for calculating and obtaining the time delay between the shooting of the sample to be tested by the observation loop and the generation of the discharge voltage waveform of the sample to be tested by the discharge loop according to the test trigger signal; generating an impact trigger signal and a shooting signal according to the time delay; the discharging loop is connected with the time delay pulse generator and used for discharging at two ends of a to-be-tested sample according to the impact trigger signal to generate a discharging voltage waveform; and the observation loop is connected with the time delay pulse generator and is used for synchronously acquiring observation image data corresponding to the discharge voltage waveform of the to-be-detected sample when the two ends of the to-be-detected sample are discharged according to the shooting signal. In the embodiment, the time synchronization of the discharge loop and the observation loop is realized mainly by controlling the time interval of the trigger signals of the observation loop and the discharge loop; the control mode is mainly realized by a time delay pulse generator, and the capture shooting of the discharging process is realized by setting two paths of signals to respectively trigger a discharging loop and an observing loop; the corresponding method of the discharge waveform and the observation photo is obtained by calculating the propagation time of the light path and the circuit signal. The delay pulse generator may be a DG535 four-channel digital delay pulse generator.
In an embodiment of the present invention, the delay pulse generator further includes a discharge delay calculation module, a shooting delay calculation module, and a comparison module; the discharge time delay calculation module is used for calculating the discharge control time used between the trigger signal output module outputting the test trigger signal and the discharge loop controlling the discharge voltage waveform generated by the to-be-tested sample; the shooting time delay calculation module is used for calculating shooting control time used by the trigger signal output module to output the test trigger signal until the observation loop shoots the to-be-tested sample; the comparison module is used for obtaining time delay between the discharge control time and the shooting control time according to comparison of the discharge control time and the shooting control time, generating an impact trigger signal and a shooting signal according to the time delay, and enabling the to-be-tested sample to generate a discharge voltage waveform to be shot by the observation loop at the same time.
In the above embodiment, the discharge loop includes: the device comprises a third time delay calculating unit, a fourth time delay calculating unit and a fifth time delay calculating unit; the third time delay calculating unit is used for acquiring a third time delay of the impact trigger signal generated by the time delay pulse generator according to the test trigger signal; the fourth time delay calculating unit is used for obtaining a fourth time delay according to the difference value between the time of the time delay pulse generator outputting the impact trigger signal and the time of the discharging loop receiving the impact trigger signal; the fifth time delay calculating unit is used for obtaining a fifth time delay according to the discharge delay time of the discharge loop; and obtaining the discharge control time according to the sum of the third time delay, the fourth time delay and the fifth time delay. The observation loop includes: the device comprises a first time delay calculating unit, a second time delay calculating unit and a sixth time delay calculating unit; the first time delay calculating unit is used for obtaining a first time delay according to the difference value of the output time of the test trigger signal and the time of the observation loop receiving the shooting signal; the second time delay calculating unit is used for obtaining a second time delay according to the exposure action time of the shooting unit in the observation loop; the sixth time delay calculating unit is used for obtaining a sixth time delay according to the time for the light to be transmitted from the to-be-tested sample to the shooting unit; and acquiring shooting control time according to the sum of the first time delay, the second time delay and the sixth time delay.
Taking the principle structure of the steep wave discharge synchronous observation system as an example, please refer to fig. 2, wherein the delay pulse generator adopts DG535, the observation loop adopts an ICCD ultra high speed camera, and the discharge loop adopts a surge voltage generator; the DG535 four-channel digital delay pulse generator can output four paths of pulse signals, the time interval is adjustable from 0 s to 1s, the minimum adjustment step length is 1ns, and delay synchronization control can be realized by matching the photoelectric conversion module and the electro-optical conversion module. In the discharge circuit, the trigger signal is delayed (third delay) from the signal source by t3 of the DG535 and then output, and reaches the surge equipment with a delay of t4 (fourth delay). The time from the receipt of the trigger signal by the impact device until the voltage appears across the test article is t5 (fifth time delay), which is the discharge delay, which is related to the discharge delay and the discharge loop length of the impact device. In the observation loop, the time t1 (first delay) when the trigger signal is output from the signal source to the camera is the delay of the trigger signal on the cable. The delay from the reception of the trigger signal to the exposure action of the ICCD is t2 (second delay), which can be set artificially with an accuracy of 1ns, but there is a minimum value, which is related to the exposure time per frame and the two-frame time interval of the camera, the shorter the exposure time per frame and the interval, the longer the delay time. The time when the light reaches the camera sensor from the surface of the test piece is the light path time t6 (sixth time delay). In order to be able to capture the discharge process, t1+ t2 is t3+ t4+ t5+ t 6. Wherein t1 and t4 are related to the length of the signal wire, and t6 is related to the length of the optical path, which can be accurately measured and calculated. t4+ t5 is related to the shock device and the discharge circuit length, and is measured to be no more than 10 mus and is relatively stable. In actual operation, the length of a signal wire of the ICCD camera is 30m, the shooting distance of a lens, namely the length of an optical path, does not exceed 10m, so t1-t6 does not exceed 0.1 mu s, and the difference between t1-t6 and t4+ t5 does not exceed 10 mu s. t2 has the minimum value, t2 and t3 are both artificial adjustable quantities, the adjustment precision is 1ns, the adjustment upper limit is 1ms, and the requirements can be completely met. Therefore, synchronization between the observation circuit and the discharge circuit can be achieved by controlling t2 and t 3.
In order to be able to correspond the state in the process picture of the steep wave discharge to the measured voltage waveform, the time of each part needs to be measured, analyzed and calculated; referring to fig. 3, in an embodiment of the present invention, t1 is the delay of the trigger signal from the sending to the receiving of the ICCD camera, and is the time consumed by the signal on the signal transmission cable; t2 is the delay from triggering to taking a picture by the camera, which can be set manually and the delay for each picture read in software; t3 is the time of exposure per frame; t4 is the time from the light emitted by the sample to the camera sensor, and the distance from the camera to the sample is L1Since the light speed is c, the L is actually obtained by the camera1C, images before the start; t5 is the time for the voltage signal to reach the oscilloscope from the sample through the voltage divider, the signal cable and the attenuator. The time delay of the signal on the signal cable and the attenuator can be measured as t by adding the signal at one end/5, the length of the circuit of the test sample reaching the input end of the cable through the conducting wire and the voltage divider is about L2The propagation time t is also required according to the speed of light//5＝L2/c，t5＝t/5+t//5. t7 is the measured value, which is the time interval between the trigger signal being sent and the receipt of a point on the steep voltage waveform, and is read by the oscilloscope. t6 is the actual delay of the state corresponding to the trigger signal and the sample photograph. To intuitively explain the time correspondence between the entire discharge and the shooting, the relationship of the time intervals can be obtained according to the discharge time sequence logic, which is shown in fig. 6, wherein t7 is t1+ t2+ t3-t4+ t 5. Here, t1, t5, and t4 are fixed values, and t2 and t3 are controlled values set manually, so that t7 can be calculated, and the waveform time point corresponding to the discharge picture can be found from the figure. It should be noted that, in this embodiment, since the steep wave front time is extremely short, the ICCD exposure time period cannot be ignored,the actual picture taken is therefore in a superimposed state within the exposure period. However, since the discharge process is continuously developed (as can be seen from the photograph), and the time for the discharge channel to dissipate is much longer than the shooting time, the discharge state at the end of the exposure can be approximately replaced by the discharge state shot in the exposure period for analysis.
Referring to fig. 4, in an embodiment of the present invention, the discharge circuit includes a surge voltage generator, a surge voltage ionization device and a conduction circuit; the conduction circuit is connected with the delay pulse generator and is used for photoelectrically converting an impact trigger signal output by the delay pulse generator and outputting the impact trigger signal to the impact voltage generator; the impulse voltage generator is connected with the time delay pulse generator through the conduction circuit and used for controlling the impulse voltage to be subjected to assembling at two ends of the to-be-tested sample to discharge according to the impulse trigger signal to generate a discharge voltage waveform. The observation loop comprises an ICCD camera, an oscilloscope and a resistance voltage divider; the ICCD camera is connected with the time delay pulse generator and is used for synchronously acquiring observation image data corresponding to the discharge voltage waveform of the to-be-detected sample when the two ends of the to-be-detected sample are discharged according to the shooting signal; one end of a measurement channel of the oscilloscope is connected with the delay pulse generator, and the other end of the measurement channel is connected with the resistance voltage divider for obtaining a voltage waveform; one end of the resistance voltage divider is connected with the impulse voltage transubscription device, and the other end of the resistance voltage divider is connected with a measurement channel of the oscilloscope, and the resistance voltage divider is used for converting steep wave voltage output by the impulse voltage transubscription device into a low-voltage signal and then outputting the low-voltage signal to the oscilloscope.
In the above embodiment, the whole steep wave discharge synchronous observation system is shown in fig. 4; the high-voltage output end of the impact generator is connected with one end of the sharpening ball by a flat copper wire, and the other end of the sharpening ball is connected with the upper electrode of the sample by a flat copper wire. The impulse voltage generator, the lower electrode of the test sample tool and the resistor voltage divider are reliably connected with the ground. In order to protect the ICCD camera and oscilloscope, DG535 from ground potential rise, its power supply is all connected with the isolation transformer of the filter and provides double protection via UPS. The DG535 is triggered by a falling edge signal output by the oscilloscope 1, the DG535 respectively provides trigger signals of a discharging loop and an observation loop, the time interval of the two signals is adjustable, and the trigger signal of the observation loop is output to a measurement channel CH1 of the oscilloscope 2. In the discharge loop, the trigger signal is converted into an optical signal through the electro-optic conversion module, the optical signal reaches the impulse voltage generator through the optical fiber, the impulse voltage is triggered and impacted through the electro-optic conversion module, and the impulse voltage reaches the surface of the test sample through the sharpening ball to complete discharge. The steep voltage outputs a low-voltage signal through the resistor voltage divider, and the low-voltage signal is transmitted to another measuring channel CH2 of the oscilloscope 2 through a signal cable to obtain a voltage waveform; the ICCD camera is triggered by the observation loop trigger signal through the camera signal cable, and the camera starts to act again for taking a picture after a certain delay (t 2 in figure 2) after the trigger. There is some fluctuation in the time from the trigger signal to the discharge timing, which is caused by the dispersion of the discharge point, but the fluctuation range is found to be small by the experiment, and it is possible to pass the preliminary experiment and then adjust t 2.
Referring to fig. 5, the present invention further provides a method for synchronously observing steep-wave discharge, the method comprising: s501, according to the received test trigger signal, obtaining a difference value between the time of shooting the to-be-tested sample by the observation loop and the time of controlling the to-be-tested sample to generate a discharge voltage waveform by the discharge loop; s502, respectively generating an impact trigger signal and a shooting signal through a delay pulse generator according to the difference value; s503, controlling the observation loop to synchronously acquire observation image data corresponding to the discharge voltage waveform of the to-be-detected sample when the discharge loop discharges at two ends of the to-be-detected sample according to the impact trigger signal and the shooting signal.
In the above embodiment, the obtaining a difference between a time when the observation loop shoots the to-be-tested object and a time when the discharge loop controls the to-be-tested object to generate the discharge voltage waveform according to the received test trigger signal includes: obtaining discharge control time according to the time from receiving a test trigger signal to the discharge loop to control the discharge voltage waveform generated by the to-be-tested sample; acquiring shooting control time according to the time from receiving the test trigger signal to shooting the to-be-tested sample by the observation loop; and comparing the discharge control time with the shooting control time to obtain time delay between the discharge control time and the shooting control time, generating an impact trigger signal and a shooting signal according to the time delay, and enabling the test sample to be tested to generate a discharge voltage waveform and be shot by the observation loop at the same time.
In the above embodiment, the discharge control time includes a third time delay, a fourth time delay, and a fifth time delay; the third time delay is the time for generating the impact trigger signal by the time delay pulse generator according to the test trigger signal; the fourth time delay is the difference value between the time of the time delay pulse generator outputting the impact trigger signal and the time of the discharge loop receiving the impact trigger signal; the fifth time delay is the discharge delay time of the discharge loop. The shooting control time includes: a first time delay, a second time delay and a sixth time delay; the first time delay is the difference time of the output time of the test trigger signal and the time of the observation loop receiving the shooting signal; the second time delay is based on the exposure action time of the shooting unit in the observation loop; the sixth time delay is the time taken for light to be transmitted from the sample to be tested to the shooting unit.
Taking the test result of a certain time of the positive polarity test sample with the paint as an example, the waveform corresponds to the discharge picture; if the first shot of the selected discharged photograph has a camera set delay of 4.33 μ s, the time interval corresponding to the first shot should be 4.555 μ s, i.e., 4.33+0.095+0.07+ 0.06. The trigger level of the ICCD is set to 2.5V on the rising edge, so timing starts from the trigger level reaching 2.5V. Four corresponding pictures are found by the method, the exposure time is 40ns, and the frame interval is 0 ns. For convenience of labeling, the end points of the corresponding time periods are respectively labeled on the oscillogram. Only the waveform near the discharge time is cut, the abscissa is stretched, and the whole process is not subjected to processing such as filtering, as shown in fig. 7A to 7E. As can be seen from fig. 7A to 7E, the voltage at the moment corresponding to the discharge process in the first graph is low, and almost no discharge can be seen, for example, as the voltage increases in fig. 7A, corona starts to appear around the electrode, and even some finer discharge antennas appear in fig. 7B, where the voltage is already close to about half of the amplitude. The voltage then rises further, forming a number of brighter discharge channels extending around the electrodes. At this time, the difference between the discharge channels is not obvious, the length and brightness of each discharge channel are approximately equal, as shown in fig. 7C, the length of the discharge channel is also increased rapidly along with the rapid increase of the voltage, when the voltage is close to the peak value, a certain discharge channel is close to penetrating the discharge gap and becomes brighter, the whole air distance along the surface is broken down, then the voltage is rapidly reduced, and the discharge is completed, as shown in fig. 7D.
The invention also provides a computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method when executing the computer program.
The present invention also provides a computer-readable storage medium storing a computer program for executing the above method.
The steep wave discharge synchronous observation system and the method provided by the invention are not only suitable for capturing the steep wave discharge process, but also can be applied to the shock discharge processes of lightning waves, operating waves and the like; the device can effectively realize synchronous correspondence of observation images and voltage waveforms, and provides a test platform for research of steep wave discharge process and mechanism.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (13)
1. A system for synchronously observing steep-wave discharge, the system comprising: the device comprises a trigger signal output module, a delay pulse generator, a discharge loop and an observation loop;
the trigger signal output module is used for outputting a test trigger signal;
the delay pulse generator is respectively connected with the trigger signal output module, the discharge loop and the observation loop and is used for calculating and obtaining the time delay between the shooting of the sample to be tested by the observation loop and the generation of the discharge voltage waveform of the sample to be tested by the discharge loop according to the test trigger signal; generating an impact trigger signal and a shooting signal according to the time delay;
the discharging loop is connected with the time delay pulse generator and used for discharging at two ends of a to-be-tested sample according to the impact trigger signal to generate a discharging voltage waveform;
and the observation loop is connected with the time delay pulse generator and is used for synchronously acquiring observation image data corresponding to the discharge voltage waveform of the to-be-detected sample when the two ends of the to-be-detected sample are discharged according to the shooting signal.
2. The steep wave discharge synchronous observation system according to claim 1, wherein the delay pulse generator further comprises a discharge delay calculation module, a shooting delay calculation module and a comparison module;
the discharge time delay calculation module is used for calculating the discharge control time used between the trigger signal output module outputting the test trigger signal and the discharge loop controlling the discharge voltage waveform generated by the to-be-tested sample;
the shooting time delay calculation module is used for calculating shooting control time used by the trigger signal output module to output the test trigger signal until the observation loop shoots the to-be-tested sample;
the comparison module is used for obtaining time delay between the discharge control time and the shooting control time according to comparison of the discharge control time and the shooting control time, generating an impact trigger signal and a shooting signal according to the time delay, and enabling the to-be-tested sample to generate a discharge voltage waveform to be shot by the observation loop at the same time.
3. The steep wave discharge synchronous observation system according to claim 1, wherein the discharge loop comprises: the device comprises a third time delay calculating unit, a fourth time delay calculating unit and a fifth time delay calculating unit;
the third time delay calculating unit is used for acquiring a third time delay of the impact trigger signal generated by the time delay pulse generator according to the test trigger signal;
the fourth time delay calculating unit is used for obtaining a fourth time delay according to the difference value between the time of the time delay pulse generator outputting the impact trigger signal and the time of the discharging loop receiving the impact trigger signal;
the fifth time delay calculating unit is used for obtaining a fifth time delay according to the discharge delay time of the discharge loop;
and obtaining the discharge control time according to the sum of the third time delay, the fourth time delay and the fifth time delay.
4. The steep wave discharge synchronous observation system according to claim 1, wherein the observation loop comprises: the device comprises a first time delay calculating unit, a second time delay calculating unit and a sixth time delay calculating unit;
the first time delay calculating unit is used for obtaining a first time delay according to the difference value of the output time of the test trigger signal and the time of the observation loop receiving the shooting signal;
the second time delay calculating unit is used for obtaining a second time delay according to the exposure action time of the shooting unit in the observation loop;
the sixth time delay calculating unit is used for obtaining a sixth time delay according to the time for the light to be transmitted from the to-be-tested sample to the shooting unit;
and acquiring shooting control time according to the sum of the first time delay, the second time delay and the sixth time delay.
5. The steep wave discharge synchronous observation system according to claim 1, wherein the discharge circuit comprises a surge voltage generator, a surge voltage ionization device and a conduction circuit;
the conduction circuit is connected with the delay pulse generator and is used for photoelectrically converting an impact trigger signal output by the delay pulse generator and outputting the impact trigger signal to the impact voltage generator;
the impulse voltage generator is connected with the time delay pulse generator through the conduction circuit and used for controlling the impulse voltage to be subjected to assembling at two ends of the to-be-tested sample to discharge according to the impulse trigger signal to generate a discharge voltage waveform.
6. The system for synchronously observing steep wave discharge according to claim 5, wherein the observation loop comprises an ICCD camera, an oscilloscope and a resistor divider;
the ICCD camera is connected with the time delay pulse generator and is used for synchronously acquiring observation image data corresponding to the discharge voltage waveform of the to-be-detected sample when the two ends of the to-be-detected sample are discharged according to the shooting signal;
one end of a measurement channel of the oscilloscope is connected with the delay pulse generator, and the other end of the measurement channel is connected with the resistance voltage divider for obtaining a voltage waveform;
one end of the resistance voltage divider is connected with the impulse voltage transubscription device, and the other end of the resistance voltage divider is connected with a measurement channel of the oscilloscope, and the resistance voltage divider is used for converting steep wave voltage output by the impulse voltage transubscription device into a low-voltage signal and then outputting the low-voltage signal to the oscilloscope.
7. The steep discharge synchronous observation system according to any one of claims 1 to 6, wherein the time delay pulse generator is a DG535 four-channel digital time delay pulse generator.
8. A steep wave discharge synchronous observation method is characterized by comprising the following steps:
according to the received test trigger signal, obtaining a difference value between the time of shooting the to-be-tested sample by the observation loop and the time of controlling the to-be-tested sample to generate a discharge voltage waveform by the discharge loop;
respectively generating an impact trigger signal and a shooting signal through a delay pulse generator according to the difference value;
and controlling the observation loop to synchronously acquire observation image data corresponding to the discharge voltage waveform of the to-be-detected sample when the discharge loop discharges at two ends of the to-be-detected sample according to the impact trigger signal and the shooting signal.
9. The method for synchronously observing steep wave discharge according to claim 8, wherein the obtaining a difference between a time when the observation loop shoots the test object and a time when the discharge loop controls the test object to generate the discharge voltage waveform according to the received test trigger signal comprises:
obtaining discharge control time according to the time from receiving a test trigger signal to the discharge loop to control the discharge voltage waveform generated by the to-be-tested sample;
acquiring shooting control time according to the time from receiving the test trigger signal to shooting the to-be-tested sample by the observation loop;
and comparing the discharge control time with the shooting control time to obtain time delay between the discharge control time and the shooting control time, generating an impact trigger signal and a shooting signal according to the time delay, and enabling the test sample to be tested to generate a discharge voltage waveform and be shot by the observation loop at the same time.
10. The steep-wave discharge synchronous observation method according to claim 9, wherein the discharge control time includes a third time delay, a fourth time delay, and a fifth time delay;
the third time delay is the time for generating the impact trigger signal by the time delay pulse generator according to the test trigger signal;
the fourth time delay is the difference value between the time of the time delay pulse generator outputting the impact trigger signal and the time of the discharge loop receiving the impact trigger signal;
the fifth time delay is the discharge delay time of the discharge loop.
11. The steep-wave discharge synchronous observation method according to claim 9, wherein the shooting control time includes: a first time delay, a second time delay and a sixth time delay;
the first time delay is the difference time of the output time of the test trigger signal and the time of the observation loop receiving the shooting signal;
the second time delay is based on the exposure action time of the shooting unit in the observation loop;
the sixth time delay is the time taken for light to be transmitted from the sample to be tested to the shooting unit.
12. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method of any one of claims 8 to 11 when executing the computer program.
13. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program for executing the method of any one of claims 8 to 11.
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Application publication date: 20200214 |