Pressure-sensitive coating dynamic calibration device

Abstract

The utility model provides a pressure-sensitive coating dynamic calibration device, and the device comprises a shock tube which comprises a high-pressure-section shock tube and a low-pressure-section shock tube; the first gas source is connected with the high-pressure section shock tube; the membrane clamping mechanism is arranged between the high-pressure section shock tube and the low-pressure section shock tube, and a membrane is arranged on the membrane clamping mechanism; the membrane puncturing mechanism is arranged in the high-pressure section shock tube and is used for puncturing the membrane; the test mechanism is arranged at one end, far away from the high-pressure section shock tube, of the low-pressure section shock tube, and a test sample coated with a pressure-sensitive coating is arranged on the test mechanism; the second gas source is connected with the low-pressure section shock tube; the light source is arranged on one side of the low-pressure section shock tube and used for providing an excitation light source for the test sample; the photomultiplier is arranged on one side of the low-pressure section shock tube and used for collecting light intensity signals on the surface of the test sample, converting the light intensity signals into electric signals and transmitting the electric signals to the oscilloscope for spectral analysis. According to the dynamic calibration device for the pressure-sensitive coating, the dynamic calibration of the quick-response pressure-sensitive coating can be realized, and the accuracy of the measurement result is improved.

Description

Technical Field

[0001] This application relates to the technical field of pressure-sensitive coatings, and more particularly, to a dynamic calibration device for pressure-sensitive coatings. Background Art

[0002] Pressure-sensitive coatings, also known as pressure-sensitive paints (PSP, Pressure Sensitive Paint). The pressure-sensitive coating technology refers to the use of optical characteristics to measure the pressure and temperature distribution on the surface of an object, that is, a special pressure-sensitive coating is covered on the surface of the model. After being irradiated with light of a certain wavelength, the coating can emit fluorescence. The intensity field and temperature field of the emitted light are measured, and the corresponding pressure distribution is calculated. It has the advantages of high spatial resolution, not being restricted by the model structure, not disturbing the flow field on the model surface, and being able to realize large-area pressure distribution measurement.

[0003] The existing pressure-sensitive coating technology is mainly used to study and verify the response speed of pressure-sensitive coatings to dynamic pressure changes. By injecting gas into the high-pressure section of the shock tube, the pressure in the high-pressure section gradually increases, and the diaphragm between the high-pressure section and the low-pressure section of the shock tube is broken through by relying on the natural membrane rupture method to generate a high-speed pressure step. When the shock wave reaches the surface of the pressure-sensitive paint sample, a fluorescence signal is generated after being irradiated with light of a certain wavelength, and the fluorescence signal is measured and the corresponding pressure distribution is calculated, thereby realizing the dynamic calibration of the pressure-sensitive coating. However, the defect of natural membrane rupture is that both the pressure and time of membrane rupture are uncontrollable, which will affect the timeliness and accuracy of the calibration results of the dynamic characteristics of the pressure-sensitive coating. Summary of the Utility Model

[0004] The purpose of the embodiments of this application is to provide a dynamic calibration device for pressure-sensitive coatings, which can realize the dynamic calibration of fast-response pressure-sensitive coatings and improve the accuracy of its measurement results.

[0005] This application provides a dynamic calibration device for pressure-sensitive coatings, including: a shock tube, which includes a high-pressure section shock tube and a low-pressure section shock tube; a first gas source connected to the high-pressure section shock tube; a film clamping mechanism provided between the high-pressure section shock tube and the low-pressure section shock tube, and a diaphragm is provided on the film clamping mechanism; a film piercing mechanism provided in the high-pressure section shock tube for piercing the diaphragm; a testing mechanism provided at one end of the low-pressure section shock tube away from the high-pressure section shock tube, and a test sample coated with pressure-sensitive coating is provided on the testing mechanism; a second gas source connected to the low-pressure section shock tube; a light source provided on one side of the low-pressure section shock tube for providing an excitation light source to the test sample; and a photomultiplier tube provided on one side of the low-pressure section shock tube for collecting the light intensity signal on the surface of the test sample and converting it into an electrical signal to be transmitted to an oscilloscope for spectral analysis.

[0006] In one embodiment, the film piercing mechanism includes: a mounting base disposed on the high-pressure section shock tube; a film piercing driving member disposed on the mounting base; and a film piercing head disposed at the output end of the film piercing driving member, and the film piercing head is arranged facing the diaphragm.

[0007] In one embodiment, the film clamping mechanism includes: a diaphragm support seat on which the diaphragm is disposed; a first connection assembly connected to the diaphragm support seat, and the first connection assembly is used to connect the high-pressure section shock tube and the low-pressure section shock tube.

[0008] In one embodiment, the first connection assembly includes: a first connection portion and a second connection portion; the first connection portion is disposed on the high-pressure section shock tube, and the second connection portion is disposed on the low-pressure section shock tube; the first connection portion is detachably connected to the second connection portion, and / or the second connection portion is detachably connected to the first connection portion.

[0009] In one embodiment, the testing mechanism includes: a test sample fixing base, and the test sample is disposed on one side surface of the test sample fixing base located inside the low-pressure section shock tube; a second connection assembly disposed on the test sample fixing base; and the second connection assembly connects the low-pressure section shock tube and the test sample fixing base.

[0010] In one embodiment, a buckle portion is provided on the low-pressure section shock tube; and the second connection assembly is detachably connected to the buckle portion.

[0011] In one embodiment, an observation window is provided outside the low-pressure section shock tube; the light source is provided with a first channel, and the photomultiplier tube is provided with a second channel; the first channel passes through the observation window and extends into one end inside the low-pressure section shock tube, and is connected to one end of the second channel passing through the observation window and extending into the low-pressure section shock tube, and the open end of the connection portion is arranged facing the test sample.

[0012] In one embodiment, the light source and the photomultiplier tube are respectively disposed on both sides of the low-pressure section shock tube through brackets.

[0013] In one embodiment, a pressure sensor is further provided on the low-pressure section shock tube, and the pressure sensor is used to detect the air pressure inside the low-pressure section shock tube.

[0014] In one embodiment, at least one support leg assembly is provided on the shock tube.

[0015] In the solution of this application, through a dynamic calibration device for pressure-sensitive coatings, the pressure of a test sample coated with a pressure-sensitive coating is measured, and the response time of the used pressure-sensitive coating is determined by observing the decay time of the light intensity signal emitted by the pressure-sensitive coating as the step pressure changes, thereby realizing the dynamic calibration of a fast-response pressure-sensitive coating and improving the accuracy of the measurement results. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of this application, the drawings required for use in the embodiments of this application will be briefly introduced below.

[0017] Figure 1 Schematic diagram of the overall structure of a dynamic calibration device for pressure-sensitive coatings provided by an embodiment of this application;

[0018] Figure 2 Schematic diagram of the structure of a film piercing mechanism provided by an embodiment of this application;

[0019] Figure 3 Schematic diagram of the structure of a film clamping mechanism provided by an embodiment of this application;

[0020] Figure 4 Schematic diagram of the structure of a first connection component provided by an embodiment of this application;

[0021] Figure 5 Schematic diagram of the structure of a test mechanism provided by an embodiment of this application;

[0022] Figure 6 Schematic diagram of the structure of a second connection component provided by an embodiment of this application;

[0023] Figure 7 Schematic diagram of the optical path direction inside a low-pressure shock tube provided by an embodiment of this application;

[0024] Figure 8 Schematic diagram of a dynamic calibration curve of a pressure-sensitive coating provided by an embodiment of this application.

[0025] Reference numerals:

[0026] 1 - Dynamic calibration device for pressure - sensitive coatings; 100 - Shock tube; 110 - High - pressure section shock tube; 111 - First air valve; 112 - Second air valve; 113 - First vacuum pressure gauge; 114 - Third air valve; 115 - Bleed valve; 116 - Second vacuum pressure gauge; 120 - Low - pressure section shock tube; 121 - Buckle part; 130 - Support foot assembly; 200 - First air source; 300 - Film - piercing mechanism; 310 - Mounting base; 320 - Film - piercing driving part; 330 - Film - piercing head; 400 - Film - clamping mechanism; 410 - Diaphragm; 420 - Diaphragm support seat; 430 - First connection assembly; 431 - First connection part; 4311 - First connection base; 43110 - First card slot; 43111 - First card board; 4312 - First rotating pressing part; 43120 - First bayonet; 4313 - First buckle pull rod; 4314 - First elastic part; 432 - Second connection part; 4321 - Second connection base; 43210 - Second card slot; 43211 - Second card board; 4322 - Second rotating pressing part; 43220 - Second bayonet; 4323 - Second buckle pull rod; 4324 - Second elastic part; 500 - Testing mechanism; 510 - Test sample; 520 - Test sample fixing base; 530 - Second connection assembly; 531 - Third connection base; 532 - Third rotating pressing part; 5320 - Third bayonet; 5321 - Third card board; 533 - Third buckle pull rod; 534 - Third elastic part; 600 - Second air source; 700 - Light source; 710 - First channel; 800 - Photomultiplier tube; 810 - Second channel; 900 - Bracket; 1000 - Observation window; 1100 - Pressure sensor. Detailed implementation mode

[0027] The terms "first", "second", "third", etc. are only used for distinguishing descriptions, do not represent the serial number of arrangement, and cannot be understood as indicating or implying relative importance.

[0028] In addition, the terms such as "horizontal", "vertical", "hanging" do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0029] In the description of this application, it should be noted that the orientation or positional relationship indicated by the terms "inner", "outer", "left", "right", "up", "down", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is usually placed during use. It is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to this application.

[0030] In the description of the present application, unless otherwise clearly specified and defined, the terms "arranged", "installed", "connected", and "coupled" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two components.

[0031] The technical solution of the present application will be described below with reference to the accompanying drawings.

[0032] Please refer to Figures 1 to 7 As shown, the present application provides a dynamic calibration device 1 for a pressure-sensitive coating, including: a shock tube 100, a first gas source 200, a film-piercing mechanism 300, a film-clamping mechanism 400, a testing mechanism 500, a second gas source 600, a light source 700, and a photomultiplier tube 800. Among them, the shock tube 100 includes a high-pressure section shock tube 110 and a low-pressure section shock tube 120; the first gas source 200 is connected to the high-pressure section shock tube 110; the film-clamping mechanism 400 is arranged between the high-pressure section shock tube 110 and the low-pressure section shock tube 120, and a diaphragm 410 is provided on the film-clamping mechanism 400; the film-piercing mechanism 300 is arranged in the high-pressure section shock tube 110 and is used to pierce the diaphragm 410; the testing mechanism 500 is arranged at one end of the low-pressure section shock tube 120 away from the high-pressure section shock tube 110, and a test sample 510 coated with a pressure-sensitive coating is provided on the testing mechanism 500; the second gas source 600 is connected to the low-pressure section shock tube 120; the light source 700 is arranged on one side of the low-pressure section shock tube 120 and is used to provide an excitation light source to the test sample 510; the photomultiplier tube 800 is arranged on one side of the low-pressure section shock tube 120 and is used to collect the light intensity signal on the surface of the test sample 510 and convert it into an electrical signal and transmit it to an oscilloscope for spectral analysis.

[0033] In some embodiments, at least one support foot assembly 130 is provided on the shock tube 100. By providing the support foot assembly 130, the support of the shock tube 100 can be realized. As an example, three pairs of support foot assemblies 130 can be provided on the shock tube 100, which are respectively arranged at the high-pressure section shock tube 110 of the shock tube 100, one end of the low-pressure section shock tube 120, and the other end of the low-pressure section shock tube 120, and the three-point support forms a stable support for the shock tube 100.

[0034] In some embodiments, the support foot assembly 130 can realize height adjustment. As an example, the support foot assembly 130 may include a driving component and a support foot. The driving component may be a cylinder, and the output end of the cylinder is connected to the support foot. By driving the support foot to expand and contract through the driving component, the rise or fall of the support foot can be realized, and the height of the shock tube 100 from the ground can be adjusted according to the height requirement of the shock tube 100. In other embodiments, the driving component may also be an electric push rod.

[0035] In some embodiments, please refer to Figure 1 As shown, at least one air valve may be provided on the high-pressure shock tube 110. By way of example, the air valves include a first air valve 111 and a second air valve 112. A first vacuum pressure gauge 113 may also be provided on the high-pressure shock tube 110. The first gas source 200 may supply gas by a vacuum compressor pump set. The first gas source 200 is communicated with the high-pressure shock tube 110 through the first air valve 111. When the first air valve 111 is opened, gas is injected into the high-pressure shock tube 110 through the vacuum compressor pump set, so that the pressure in the high-pressure shock tube 110 gradually rises. The pressure in the high-pressure shock tube 110 can be monitored in real time through the first vacuum pressure gauge 113. Among them, the pressure in the high-pressure shock tube 110 can be between 0 and 300 Kpa.

[0036] It should be noted that when gas is injected into the high-pressure shock tube 110 through the vacuum compressor pump set, the high-pressure shock tube 110 and the low-pressure shock tube 120 are in a sealed and non-connected state, and gas dispersion will not occur.

[0037] In some embodiments, the high-pressure shock tube 110 can be selected to be made of stainless steel, and the high-pressure shock tube 110 is a square tube with a side length of 100 mm, a wall thickness of 10 mm, and a length of 1 m.

[0038] In some embodiments, a temperature sensor may also be provided on the high-pressure shock tube 110 to test the temperature value information inside the high-pressure shock tube 110 through the temperature sensor.

[0039] Please refer to Figure 2 As shown, the film piercing mechanism 300 includes: a mounting base 310, a film piercing driving member 320, and a film piercing head 330. The mounting base 310 is provided on the high-pressure shock tube 110; the film piercing driving member 320 is provided on the mounting base 310; the film piercing head 330 is provided at the output end of the film piercing driving member 320, and the film piercing head 330 faces the diaphragm 410.

[0040] In this embodiment, the mounting base 310 can be fixedly installed on the inner wall of the high-pressure shock tube 110 by means of bolt connection or welding, and the film piercing driving member 320 is fixedly installed on the mounting base 310. In some embodiments, the film piercing driving member 320 can be one of a cylinder, a screw motor transmission mechanism, and a gear rack transmission mechanism. The film piercing head 330 is driven by the film piercing driving member 320 to move in the direction of the diaphragm 410, and the film piercing head 330 is driven by the driving force of the film piercing driving member 320 to pierce the diaphragm 410 to achieve automatic film piercing. The film piercing head 330 can be set as a pointed needle-like structure, so as to easily pierce the diaphragm 410.

[0041] As an example, when the film piercing driving member 320 is a cylinder, the input end of the film piercing driving member 320 can be connected to the second air valve 112, and the air source driving force is provided for the film piercing driving member 320 by the vacuum compressor pump set.

[0042] In some embodiments, a switching valve can also be provided between the first air valve 111 and the second air valve 112. By toggling the switching valve to open the first air valve 111 and close the second air valve 112 simultaneously, the first air source 200 can inject air into the high-pressure section shock tube 110 through the first air valve 111; by toggling the switching valve to open the second air valve 112 and close the first air valve 111 simultaneously, the first air source 200 can provide the air source driving force for the film piercing driving member 320.

[0043] In some embodiments, please refer to Figure 3 As shown, the film clamping mechanism 400 includes: a diaphragm 410, a diaphragm support seat 420, and a first connection assembly 430. The diaphragm 410 is arranged on the diaphragm support seat 420; the first connection assembly 430 is connected to the diaphragm support seat 420, and the first connection assembly 430 is used to connect the high-pressure section shock tube 110 and the low-pressure section shock tube 120.

[0044] In this embodiment, the film clamping mechanism 400 is used to fixedly install the diaphragm 410 between the high-pressure section shock tube 110 and the low-pressure section shock tube 120, and at the same time, it can connect and fix the high-pressure section shock tube 110 and the low-pressure section shock tube 120. The diaphragm 410 can be made of aluminum foil, and the thickness of the aluminum foil is between 0.2 - 0.5 mm. Before installing the diaphragm 410, a cross scratch can be pre-etched on the diaphragm 410 to facilitate the film piercing mechanism 300 to more easily pierce the diaphragm 410.

[0045] Furthermore, in order to enable the film clamping mechanism 400 to be more firmly installed between the high-pressure section shock tube 110 and the low-pressure section shock tube 120, a sealing gasket can also be provided between the high-pressure section shock tube 110, the diaphragm support seat 420, and the low-pressure section shock tube 120, so as to improve the sealing stability between the diaphragm support seat 420 and the high-pressure section shock tube 110 and the low-pressure section shock tube 120 through the sealing gasket.

[0046] Furthermore, please refer to Figure 3 and Figure 4 As shown, the first connection assembly 430 includes: a first connection portion 431 and a second connection portion 432; the first connection portion 431 is arranged on the high-pressure section shock tube 110, and the second connection portion 432 is arranged on the low-pressure section shock tube 120; the first connection portion 431 is detachably connected to the second connection portion 432, and / or, the second connection portion 432 is detachably connected to the first connection portion 431.

[0047] In some embodiments, the first connecting portion 431 may include: a first connecting base 4311, a first rotary pressing portion 4312, a first snap rod 4313, and a first elastic member 4314. Among them, the first connecting base 4311 is disposed on the surface of the high-pressure section shock tube 110, the first rotary pressing portion 4312 is hinged to the first connecting base 4311, and a first bayonet 43120 is provided on the first rotary pressing portion 4312. A first slot 43110 and a first clamping plate 43111 that cooperates with the first bayonet 43120 are further provided on the first connecting base 4311. The first snap rod 4313 is installed on the first rotary pressing portion 4312 through a pin shaft. Therefore, the first snap rod 4313 can rotate around the pin shaft. One end of the first elastic member 4314 is locked to the pin shaft, and the other end is connected to the first snap rod 4313.

[0048] The second connecting portion 432 may have the same structure as the first connecting portion 431. Specifically, the second connecting portion 432 may include: a second connecting base 4321, a second rotary pressing portion 4322, a second snap rod 4323, and a second elastic member 4324. Among them, the second connecting base 4321 is disposed on the surface of the low-pressure section shock tube 120, the second rotary pressing portion 4322 is hinged to the second connecting base 4321, and a second bayonet 43220 is provided on the second rotary pressing portion 4322. A second slot 43210 and a second clamping plate 43211 that cooperates with the second bayonet 43220 are further provided on the second connecting base 4321. The second snap rod 4323 is installed on the second rotary pressing portion 4322 through a pin shaft. Therefore, the second snap rod 4323 can rotate around the pin shaft. One end of the second elastic member 4324 is locked to the pin shaft, and the other end is connected to the second snap rod 4323.

[0049] During an operation process, please refer to Figure 4As shown, rotate the second snap rod 4323 of the second connecting part 432 counterclockwise to the position of the first slot 43110 of the first connecting part 431 so that the second snap rod 4323 can hook the first slot 43110. Hold the second rotating and pressing part 4322 and rotate it clockwise and press it tightly in the direction of the low-pressure section shock tube 120. Under the action of the second elastic member 4324, the second snap rod 4323 and the first slot 43110 are tightly clamped and locked. Then, rotate the second rotating and pressing part 4322 clockwise until the second bayonet 43220 on the second rotating and pressing part 4322 hooks the second clamping plate 43211 on the second connecting base 4321, thereby realizing the connection between the second connecting part 432 and the second connecting part 432. Next, rotate the first snap rod 4313 of the first connecting part 431 clockwise to the position of the second slot 43210 of the second connecting part 432 so that the first snap rod 4313 can hook the second slot 43210. Hold the first rotating and pressing part 4312 and rotate it counterclockwise and press it tightly in the direction of the high-pressure section shock tube 110. Under the action of the first elastic member 4314, the first snap rod 4313 and the second slot 43210 are tightly clamped and locked. Then, rotate the first rotating and pressing part 4312 counterclockwise until the first bayonet 43120 on the first rotating and pressing part 4312 hooks the first clamping plate 43111 on the first connecting base 4311, thereby realizing the connection between the first connecting part 431 and the second connecting part 432, and finally completing the mutual locking connection between the second connecting part 432 and the second connecting part 432.

[0050] By adopting the above method, the mutual locking connection between the first connecting part 431 and the second connecting part 432 can be realized. If it is necessary to release the connection between the first connecting part 431 and the second connecting part 432, the locking engagement between the first bayonet 43120 on the first rotating and pressing part 4312 and the first clamping plate 43111 on the first connecting base 4311 can be removed first. Under the elastic restoring force of the first elastic member 4314, the first snap rod 4313 releases the locking engagement with the second slot 43210, and then rotate the first snap rod 4313 counterclockwise to disengage the first snap rod 4313 from the locking of the second slot 43210. Next, remove the locking engagement between the second bayonet 43220 on the second rotating and pressing part 4322 and the second clamping plate 43211 on the second connecting base 4321. Under the elastic restoring force of the second elastic member 4324, the second snap rod 4323 releases the locking engagement with the first slot 43110, and the first connecting part 431 and the second connecting part 432 can be unlocked by unloading the second snap rod 4323 from the pin shaft of the second rotating and pressing part 4322, and the disassembly between the high-pressure section shock tube 110 and the low-pressure section shock tube 120 is completed.

[0051] In some embodiments, the connection between the first connecting portion 431 and the second connecting portion 432 can be achieved by only rotating the first snap rod 4313 of the first connecting portion 431 clockwise to the position of the second slot 43210 of the second connecting portion 432, so that the first snap rod 4313 can hook the second slot 43210. Then, hold the first rotating and pressing portion 4312 and rotate it counterclockwise and press it tightly in the direction of the high-pressure section shock tube 110. Under the action of the first elastic member 4314, the first snap rod 4313 and the second slot 43210 are tightly clamped and locked. Then, rotate the first rotating and pressing portion 4312 counterclockwise until the first bayonet 43120 on the first rotating and pressing portion 4312 hooks the first clamping plate 43111 on the first connecting base 4311, thereby realizing the connection between the first connecting portion 431 and the second connecting portion 432. If it is necessary to release the connection between the first connecting portion 431 and the second connecting portion 432, the locking engagement between the first bayonet 43120 on the first rotating and pressing portion 4312 and the first clamping plate 43111 on the first connecting base 4311 can be removed. Rotate the first rotating and pressing portion 4312 clockwise, and the first snap rod 4313 releases the locking engagement with the second slot 43210. Then, rotate the first snap rod 4313 counterclockwise, and the second snap rod 4323 releases the locking engagement with the first slot 43110. At this time, the first connecting portion 431 and the second connecting portion 432 are unlocked.

[0052] If it is necessary to release the locking between the first connecting portion 431 and the second connecting portion 432, the locking engagement between the first bayonet 43120 on the first rotating and pressing portion 4312 and the first clamping plate 43111 on the first connecting base 4311 can be removed. Under the elastic restoring force of the first elastic member 4314, the first snap rod 4313 releases the locking engagement with the second slot 43210. Then, rotate the first snap rod 4313 counterclockwise to disengage the first snap rod 4313 from the locking of the second slot 43210.

[0053] In some other embodiments, the second snap rod 4323 of the second connecting portion 432 can be rotated counterclockwise to the position of the first slot 43110 of the first connecting portion 431 so that the second snap rod 4323 can hook the first slot 43110. Hold the second rotating pressing portion 4322 and rotate it clockwise and press it tightly towards the direction of the low-pressure section shock tube 120. Under the action of the second elastic member 4324, the second snap rod 4323 and the first slot 43110 are tightly clamped and locked. At the same time, the second rotating pressing portion 4322 rotates clockwise until the second bayonet 43220 on the second rotating pressing portion 4322 hooks the second clamping plate 43211 on the second connecting base 4321, thereby realizing the connection between the second connecting portion 432 and the first connecting portion 431. If it is necessary to release the connection between the second connecting portion 432 and the first connecting portion 431, the locking engagement between the second bayonet 43220 on the second rotating pressing portion 4322 and the second clamping plate 43211 on the second connecting base 4321 can be removed. Under the elastic restoring force of the second elastic member 4324, the second snap rod 4323 releases the locking engagement with the first slot 43110, and then rotate the second snap rod 4323 counterclockwise to disengage the second snap rod 4323 from the locking of the first slot 43110.

[0054] In some embodiments, please refer to Figure 1 , at least one air valve may be provided on the low-pressure section shock tube 120. By way of example, the air valves include a third air valve 114 and a bleed valve 115. A second vacuum pressure gauge 116 may also be provided on the low-pressure section shock tube 120. The second gas source 600 can provide gas by a vacuum compressor pump set. The second gas source 600 is communicated with the low-pressure section shock tube 120 through the third air valve 114. Open the third air valve 114, and evacuate the low-pressure section shock tube 120 through the vacuum compressor pump set to reduce the pressure inside the low-pressure section shock tube 120 to form a negative pressure. The pressure inside the low-pressure section shock tube 120 can be monitored in real time through the second vacuum pressure gauge 116. Among them, the pressure inside the low-pressure section shock tube 120 can be between -90 and 0 Kpa.

[0055] It should be noted that when evacuating the low-pressure section shock tube 120 through the vacuum compressor pump set, the high-pressure section shock tube 110 and the low-pressure section shock tube 120 are in a sealed and non-connected state, and gas leakage will not occur. When the film piercing mechanism 300 finishes piercing the film, open the bleed valve 115 to restore the air pressure inside the shock tube 100 to normal pressure.

[0056] In some embodiments, the low-pressure section shock tube 120 can be selected to be made of stainless steel, and the low-pressure section shock tube 120 is a square tube with a side length of 100 mm, a wall thickness of 10 mm, and a length of 1.5 m.

[0057] In some embodiments, a temperature sensor may also be provided on the low-pressure shock tube 120 to test the temperature value information inside the low-pressure shock tube 120 through the temperature sensor.

[0058] Further, please refer to Figure 5 As shown, the testing mechanism 500 includes: a test sample 510, a test sample fixing base 520, and a second connection assembly 530. Among them, the surface of the test sample 510 can be pre-coated with a pressure-sensitive coating. When coating, it is necessary to ensure that the pressure-sensitive coating is uniform and bubble-free. The pressure-sensitive coating is evenly coated on the surface of the test sample 510, and the thickness of the coating is thin and flat to reduce the problems of bubble generation and uneven thickness. After the pressure-sensitive coating is coated, the test sample 510 is subjected to sufficient drying and curing treatment to enable the test sample 510 to maintain good and stable performance.

[0059] As an example, the test sample 510 can be an aluminum alloy sheet. The side length of the aluminum alloy sheet can be selected as 30 mm, and the thickness is 5 mm. The test sample 510 can be fixed to the surface of the test sample fixing base 520 on the side inside the low-pressure shock tube 120 by pasting or bolt connection; the second connection assembly 530 is provided on the test sample fixing base 520; the second connection assembly 530 connects the low-pressure shock tube 120 and the test sample fixing base 520.

[0060] In some embodiments, please refer to Figure 6 , a buckle portion 121 is provided on the low-pressure shock tube 120; the second connection assembly 530 is detachably connected to the buckle portion 121.

[0061] As an example, the structure of the second connection assembly 530 can refer to the structure of the first connection assembly 430. Specifically, the second connection assembly 530 may include: a third connection base 531, a third rotary pressing portion 532, a third buckle pull rod 533, and a third elastic member 534. Among them, the third connection base 531 is provided on the surface of the test sample fixing base 520. The third rotary pressing portion 532 is hinged to the third connection base 531, and a third bayonet 5320 is provided on the third rotary pressing portion 532. A buckle portion 121 and a third clamping plate 5321 that cooperates with the third bayonet 5320 are also provided on the third connection base 531. The third buckle pull rod 533 is installed on the third rotary pressing portion 532 through a pin shaft. Therefore, the third buckle pull rod 533 can rotate around the pin shaft. One end of the third elastic member 534 is locked on the pin shaft, and the other end is connected to the third buckle pull rod 533.

[0062] During an operation process, the third buckle pull rod 533 of the second connection component 530 is rotated counterclockwise to the position of the buckle portion 121 on the low-pressure section shock tube 120, so that the third buckle pull rod 533 can hook the buckle portion 121. Hold the third rotation and pressing portion 532 and rotate it clockwise and press it tightly in the direction of the test sample fixing base 520. Under the action of the third elastic member 534, the third buckle pull rod 533 and the buckle portion 121 are tightly clamped and locked. At the same time, the third rotation and pressing portion 532 rotates clockwise until the third bayonet 5320 on the third rotation and pressing portion 532 hooks the third clamping plate 5321 on the third connection base 531, completing the connection and locking of the second connection component 530 and the test sample fixing base 520.

[0063] By adopting the above method, the connection between the second connection component 530 and the test sample fixing base 520 can be realized. If it is necessary to release the connection between the second connection component 530 and the test sample fixing base 520, the locking of the third bayonet 5320 on the third rotation and pressing portion 532 and the third clamping plate 5321 on the third connection base 531 can be removed first, and at the same time, the third rotation and pressing portion 532 is rotated counterclockwise. Under the action of the elastic restoring force of the third elastic member 534, the third buckle pull rod 533 releases the locking with the buckle portion 121, and then the third buckle pull rod 533 is rotated clockwise to make the third buckle pull rod 533 disengage from the locking with the buckle portion 121, and the second connection component 530 and the buckle portion 121 are unlocked, so as to complete the disassembly of the second connection component 530 and the test sample fixing base 520.

[0064] Please refer to Figure 1 As shown, the light source 700 and the photomultiplier tube 800 are respectively arranged on both sides of the low-pressure section shock tube 120 through the bracket 900. A flange can be welded on the bracket 900 on one side outside the low-pressure section shock tube 120, and the photomultiplier tube 800 is installed on the flange. The connection between the flange and the photomultiplier tube 800 can be hermetically connected through a sealing ring. Similarly, a flange is arranged on the bracket 900 on one side outside the low-pressure section shock tube 120, and the light source 700 is arranged on the flange. The connection between the flange and the light source 700 can be hermetically connected through a sealing ring.

[0065] The light source 700 can be an ultraviolet LED light source, and a purple light filter can be installed at the light-emitting end of the light source 700. By setting the ultraviolet filter, it is convenient for the ultraviolet LED light source to irradiate the surface of the test sample 510. When the light source 700 emits excitation light, the excitation light can emit a specific wavelength band of 390 nm after passing through the ultraviolet filter. A red light filter can be installed at the light-incident end of the photomultiplier tube 800, and the red light filter can further prevent the excitation light from entering the photomultiplier tube 800, which is more convenient for the photomultiplier tube 800 to collect the light intensity signal on the surface of the test sample 510.

[0066] Furthermore, please refer toFigure 1 and Figure 7 As shown in Figure 7 , an observation window 1000 is provided outside the low-pressure shock tube 120; the light source 700 is provided with a first channel 710, and the photomultiplier tube 800 is provided with a second channel 810; the first channel 710 passes through the observation window 1000 and extends into one end inside the low-pressure shock tube 120, and is connected to one end of the second channel 810 that passes through the observation window 1000 and extends into the low-pressure shock tube 120, and the open end at the connection is arranged facing the test sample 510.

[0067] When the light source 700 enters the low-pressure shock tube 120 through the first channel 710 and irradiates the pressure-sensitive coating on the surface of the test sample 510, light in the red light band is excited. After the light in the red light band is reflected, it is transmitted from the second channel 810 to the photomultiplier tube 800, received by the photomultiplier tube 800, and the light intensity signal on the surface of the test sample 510 coated with the pressure-sensitive coating is collected through the photomultiplier tube 800 and converted into an electrical signal and transmitted to an oscilloscope connected to the photomultiplier tube 800 for spectral analysis.

[0068] In some embodiments, pressure transmitters may also be provided on the high-pressure shock tube 110 and the low-pressure shock tube 120, and the pressure inside the high-pressure shock tube 110 and the low-pressure shock tube 120 is converted into a pneumatic signal or an electrical signal through the pressure transmitters and transmitted to the oscilloscope for analysis and processing.

[0069] In some embodiments, the data after spectral analysis by the oscilloscope may also be transmitted to an analysis and processing unit. Through the analysis and processing unit, the pressure information inside the high-pressure shock tube 110 and the pressure information inside the low-pressure shock tube 120 collected during the experiment can be collected and analyzed, and the pressure parameters required for the experiment can be adjusted according to these information data, etc.

[0070] The oscilloscope processes the light intensity signal on the surface of the test sample 510 collected by the photomultiplier tube 800 and the dynamic pressure change information inside the low-pressure shock tube 120, and converts the reference time-pressure curve formed by converting the reference voltage value with a time series into a reference pressure value into a reference spectrogram, so as to realize the dynamic calibration of the fast-response pressure-sensitive coating.

[0071] Since the pressure response in the tail end of the shock tube 100, that is, in the low-pressure section shock tube 120, is relatively fast, a pressure sensor 1100 is further provided on the low-pressure section shock tube 120. The pressure sensor 1100 is used to detect the air pressure in the low-pressure section shock tube 120. Through the pressure sensor 1100, the air pressure change in the low-pressure section shock tube 120 can be monitored and sensed in real time, and the dynamic pressure change signal is converted into an electrical signal and transmitted to an oscilloscope for processing. At the same time, the pressure change signal sensed by the pressure sensor 1100 in the low-pressure section shock tube 120 can provide a trigger signal for the fast-response pressure-sensitive paint measurement.

[0072] The operation process and working principle of the pressure-sensitive paint dynamic calibration device 1 of the present application are described as follows:

[0073] Before the test starts, the pressure-sensitive paint is pre-coated on the surface of the test sample 510. When coating, it is necessary to ensure that the pressure-sensitive paint is uniform and bubble-free. The pressure-sensitive paint is evenly coated on the surface of the test sample 510, and the thickness of the coating is thin and flat to reduce the problems of bubble generation and uneven thickness. After the pressure-sensitive paint coating is completed, the test sample 510 is subjected to sufficient drying and curing treatment to keep the test sample 510 in good and stable performance.

[0074] The test sample 510 is fixed on one side surface of the test sample fixing base 520 located in the low-pressure section shock tube 120 by means of pasting or bolt connection. After the installation of the test sample 510 is completed, the connection between the second connection assembly 530 and the test sample fixing base 520 is locked. The specific installation and connection method can refer to Figure 6 and the foregoing description, which will not be elaborated here.

[0075] After the preparation of the test sample 510 is completed, a light source 700 and a photomultiplier tube 800 are respectively installed on both sides of the low-pressure section shock tube 120. Among them, the light source 700 selects an ultraviolet LED light source, and a purple light filter is installed at the light output end of the light source 700. A red light filter is installed at the light input end of the photomultiplier tube 800. Subsequently, the oscilloscope is adjusted to ensure that the pressure value signals read by the first vacuum pressure gauge 113 and the second vacuum pressure gauge 116 and the signal of the photomultiplier tube 800 can be accurately transmitted into the oscilloscope.

[0076] The diaphragm 410 of the clamping film mechanism 400 is pre-treated. Cross scratches are pre-cut on the diaphragm 410, and then the diaphragm 410 is installed on the diaphragm support seat 420 and placed at the connection of the high-pressure section shock tube 110 and the low-pressure section shock tube 120, with the diaphragm 410 facing the film piercing mechanism 300. Then, the high-pressure section shock tube 110 and the low-pressure section shock tube 120 are connected and fixed. The connection and fixation of the high-pressure section shock tube 110 and the low-pressure section shock tube 120 are realized by the mutual locking connection of the first connection part 431 and the second connection part 432. The specific installation and connection method can refer toFigure 4 As described above, it will not be elaborated here.

[0077] After the above preparations are completed, turn on the light source 700, turn on the oscilloscope to observe whether the reading of the photomultiplier tube 800 changes, and confirm that the reading change of the photomultiplier tube 800 does not exceed 1V. At this time, open the third air valve 114, close the air release valve 115, and at the same time close the first air valve 111 and the second air valve 112. The second air source 600 evacuates the low-pressure section shock tube 120, causing the pressure in the low-pressure section shock tube 120 to drop to form a negative pressure. The second vacuum pressure gauge 116 monitors the pressure in the low-pressure section shock tube 120 in real time. When the second vacuum pressure gauge 116 monitors that the pressure in the low-pressure section shock tube 120 drops to the target air pressure value of -80 kPa, close the third air valve 114, and the second air source 600 stops evacuating. Operate the oscilloscope to enter the trigger mode.

[0078] Open the first air valve 111, keep the second air valve 112 closed, and the first air source 200 injects gas into the high-pressure section shock tube 110, causing the pressure in the high-pressure section shock tube 110 to gradually rise. The first vacuum pressure gauge 113 monitors the pressure in the high-pressure section shock tube 110 in real time. When the first vacuum pressure gauge 113 monitors that the pressure in the high-pressure section shock tube 110 rises to the target air pressure value of 250 kPa, close the first air valve 111, and the first air source 200 stops injecting gas.

[0079] Control the switching valve, turn the switching valve to the second air valve 112, keep the first air valve 111 closed, open the second air valve 112, connect the first air source 200 with the film piercing mechanism 300, and provide air source driving force for the film piercing driving part 320 of the film piercing mechanism 300 through the first air source 200. The driving of the film piercing driving part 320 drives the film piercing head 330 to move in the direction of the diaphragm 410, and the film piercing head 330 is driven by the driving force of the film piercing driving part 320 to eject and pierce the diaphragm 410, and the diaphragm 410 makes a cracking sound when being pierced by an external force. After the diaphragm 410 ruptures, the gas in the high-pressure section shock tube 110 pushes the gas in the low-pressure section shock tube 120 to move in the direction of the test sample 510. The front of the moving gas forms a clean discontinuity surface, which is called a shock wave. When the shock wave reaches the surface of the test sample 510 coated with the pressure-sensitive paint, a short-duration pressure step is applied to the surface of the test sample 510. The rise time of this pressure step is much faster than the follow-up time of the pressure-sensitive paint. Therefore, a light intensity signal change curve is formed in the photomultiplier tube 800, and the electrical signal after being converted by the photomultiplier tube 800 is transmitted to the oscilloscope. After the oscilloscope analyzes and processes it, it can display the spectrogram of the entire excitation process, and finally can be used to calibrate the dynamic characteristics of the fast-response pressure-sensitive paint.

[0080] The pressure-sensitive paint dynamic calibration device 1 of the present application was used to test a certain test sample. The test conditions were that the target pressure value in the high-pressure section shock tube 110 was 250 kPa, and the target pressure value in the low-pressure section shock tube 120 was -80 kPa. Using the above operation method, for the dynamic characteristic curve of the finally calibrated fast-response pressure-sensitive paint, please refer to Figure 8 as shown.

[0081] Combined with Figure 8 it can be seen that by measuring the pressure of the test sample coated with the pressure-sensitive paint and determining the response time of the used pressure-sensitive paint by observing the decay time of the light intensity signal emitted by the pressure-sensitive paint with the step pressure change, the dynamic calibration of the fast-response pressure-sensitive paint is realized.

[0082] It should be noted that, without conflict, the features in the embodiments of the present application can be combined with each other.

[0083] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A dynamic calibration device for pressure-sensitive coatings, characterized in that: include: A shock tube, wherein the shock tube comprises a high-pressure section shock tube and a low-pressure section shock tube; A first gas source connected to the high-pressure section shock tube; A membrane clamping mechanism is provided between the high-pressure section shock tube and the low-pressure section shock tube, and a membrane is provided on the membrane clamping mechanism; A membrane piercing mechanism is provided in the high-pressure section shock tube and is used for piercing the membrane; A testing mechanism is provided on an end of the low-pressure section shock tube away from the high-pressure section shock tube, and a testing sample coated with a pressure-sensitive coating is provided on the testing mechanism; A second gas source connected to the low-pressure section shock tube; A light source is disposed on one side of the low-pressure section shock tube and is used to provide an excitation light source to the test sample; as well as The photomultiplier tube is arranged at one side of the low-voltage shock tube and is used to collect the light intensity signal on the surface of the test sample and convert it into an electrical signal to be transmitted to the oscilloscope for spectrum analysis.

2. The pressure-sensitive coating dynamic calibration device according to claim 1, characterized in that: The film piercing mechanism comprises: A mounting base is provided on the high-pressure section shock tube; The film piercing driving member is arranged on the mounting base; The film piercing head is arranged at the output end of the film piercing driving component, and the film piercing head is arranged toward the diaphragm.

3. The pressure-sensitive coating dynamic calibration device according to claim 1, characterized in that: The film clamping mechanism comprises: A diaphragm support seat, on which the diaphragm is arranged; A first connecting component is connected to the diaphragm support seat, and the first connecting component is used to connect the high-pressure section shock tube and the low-pressure section shock tube.

4. The pressure-sensitive coating dynamic calibration device according to claim 3, characterized in that: The first connection assembly includes: a first connection portion and a second connection portion; The first connection portion is provided on the high-pressure section shock tube, and the second connection portion is provided on the low-pressure section shock tube; The first connection part is detachably connected to the second connection part, and / or the second connection part is detachably connected to the first connection part.

5. The pressure-sensitive coating dynamic calibration device according to claim 1, characterized in that: The testing organization includes: A test sample fixing base, wherein the test sample is arranged on a side surface of the test sample fixing base located in the low-pressure section shock tube; The second connecting component is arranged on the test sample fixing base; the second connecting component connects the low-pressure section shock tube and the test sample fixing base.

6. The pressure-sensitive coating dynamic calibration device according to claim 5, characterized in that: The low-pressure section shock tube is provided with a buckle portion; the second connecting assembly is detachably connected to the buckle portion.

7. The pressure-sensitive coating dynamic calibration device according to claim 1, characterized in that: An observation window is provided on the outside of the low-pressure section shock tube; the light source is provided with a first channel, and the photomultiplier tube is provided with a second channel; the first channel passes through the observation window and extends into one end of the low-pressure section shock tube, and is connected with one end of the second channel that passes through the observation window and extends into the low-pressure section shock tube, and the open end of the connection is arranged toward the test sample.

8. The pressure-sensitive coating dynamic calibration device according to claim 7, characterized in that: The light source and the photomultiplier tube are respectively arranged on both sides of the low-pressure section shock tube through brackets.

9. The pressure-sensitive coating dynamic calibration device according to claim 1, characterized in that: The low-pressure section shock tube is also provided with a pressure sensor, and the pressure sensor is used to detect the air pressure in the low-pressure section shock tube.

10. The pressure-sensitive coating dynamic calibration device according to claim 1, characterized in that: At least one supporting foot assembly is provided on the shock tube.

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