Acoustic testing device, system and method for transducer

Abstract

The invention discloses an acoustic testing device, system and method for a transducer. The device comprises a test container, a purification module, an acoustic measurement module and a control module, the transducer to be tested and / or the circuit to be tested are / is arranged in the test container through the test fixture; wherein the transducer to be tested is a transducer in a non-potting state; the control module is electrically connected with the purification module and the acoustic measurement module, the purification module is communicated with the test container, and the acoustic measurement module is electrically connected with the transducer to be tested; the control module is used for controlling the purification module to provide a water medium for the test container, so that the transducer to be tested and / or the circuit to be tested are / is immersed in the water medium; wherein the resistivity of the water medium is greater than or equal to a high resistivity threshold value; and the control module is used for controlling the acoustic measurement module to perform function and acoustic testing on the transducer to be tested and / or the circuit to be tested. According to the embodiment of the invention, the influence on acoustic coupling of the transducer can be avoided, the iteration period of the transducer is shortened, and the consistency of acoustic testing is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of transducers, in particular to a transducer acoustic testing device, system and testing method thereof. BACKGROUND

[0002] As the "eyes and ears" of underwater acoustic equipment, underwater acoustic transducers can emit or receive acoustic waves and complete the conversion between the information and energy carried by the acoustic waves and the electrical signals, and are widely used in marine equipment.

[0003] When performing acoustic testing on transducers in water or other conductive liquids, the transducers need to be electrically insulated. There are three common implementation paths in existing engineering practices. The first is to perform acoustic testing in water after the transducers are sealed. The second is to use oil or silicone oil as a non-water medium to replace water. The third is to keep the electronic part of the transducer dry and only immerse the transducer end in water for testing. However, the existing technical solutions all affect the acoustic coupling testing of the transducers, resulting in poor authenticity of the test results, long iteration cycle of the transducers and high cost. SUMMARY

[0004] The present application provides a transducer acoustic testing device, system and testing method thereof to avoid affecting the acoustic coupling of the transducers and shorten the iteration cycle of the transducers, thereby improving the consistency of acoustic testing.

[0005] According to an aspect of the present application, a transducer acoustic testing device is provided, comprising: a test container, a purification module, an acoustic measurement module and a control module;

[0006] The transducer to be tested and / or the circuit to be tested are installed in the test container through a test fixture. The transducer to be tested is in an unsealed state. The control module is electrically connected to the purification module and the acoustic measurement module. The purification module is in communication with the test container, and the acoustic measurement module is electrically connected to the transducer to be tested.

[0007] The control module is configured to control the purification module to provide a water medium to the test container, so that the transducer to be tested and / or the circuit to be tested are immersed in the water medium. The resistivity of the water medium is greater than or equal to a high resistivity threshold. The control module is configured to control the acoustic measurement module to perform functional and acoustic testing on the transducer to be tested and / or the circuit to be tested.

[0008] Optionally, the purification module comprises a magnetic pump, a filter, a mixed bed resin column, an ultraviolet module, a degassing unit and a monitoring unit connected in sequence.

[0009] The degassing unit is in communication with a water inlet of the test container, and a water outlet of the test container is in communication with the filter; the purification module is configured to perform cyclic purification on the water medium with a resistivity less than the high resistivity threshold based on a monitoring result of the monitoring unit on the performance of the water medium, so that the resistivity of the water medium reaches the high resistivity threshold.

[0010] Optionally, the monitoring unit comprises a resistivity sensor and a temperature sensor.

[0011] The resistivity sensor is arranged at a water outlet of the purification module and / or in the test container, and is configured to monitor the resistivity of the water medium in the purification module and / or the test container.

[0012] The temperature sensor is arranged at the same position as the resistivity sensor, and is configured to monitor the temperature of the water medium in the purification module and / or the test container.

[0013] Optionally, the control module comprises a control unit, an interlocking unit and an alarm unit.

[0014] The control unit is electrically connected with the interlocking unit and the alarm unit respectively, and the interlocking unit is linked with the monitoring unit.

[0015] The control unit is configured to control the interlocking unit to power off the acoustic measurement module when the monitoring unit monitors that the resistivity or temperature of the water medium enters a corresponding pre-warning threshold range, and to control the interlocking unit to perform power-on test on the acoustic measurement module when the monitoring unit monitors that the resistivity or temperature of the water medium is out of the pre-warning threshold range, and to control the purification module to perform cyclic purification on the water medium.

[0016] The control unit is further configured to control the alarm unit to perform audible and visual alarm when the resistivity or temperature of the water medium enters a corresponding pre-warning threshold range.

[0017] Optionally, the acoustic measurement module comprises an acoustic wave conversion link and / or an electric energy conversion link.

[0018] The acoustic wave conversion link comprises a signal amplifier, a power amplifier and a first to-be-tested transducer which are electrically connected in sequence; the first to-be-tested transducer comprises a transmitting transducer.

[0019] The electric energy conversion link comprises a second to-be-tested transducer, a modulation circuit and a sampling circuit which are electrically connected in sequence; the second to-be-tested transducer comprises a receiving transducer or a standard hydrophone.

[0020] Optionally, an inner wall of the test container is provided with an inner lining structure, the inner lining structure comprising an underwater wedge-shaped sound absorption structure.

[0021] Optionally, the test container comprises a pressurizable pressure-resistant cavity, and a material of the test container comprises any one of soluble polytetrafluoroethylene, polytetrafluoroethylene and polyether ether ketone.

[0022] Optionally, the test fixture is provided with a grounding guard ring and an underwater shielded cable, the grounding guard ring and the underwater shielded cable being used to drain leakage current during the test.

[0023] According to another aspect of the present application, a transducer acoustic test method is provided, comprising:

[0024] Starting a purification module to purify a water medium, and injecting the water medium into a test container; wherein the water medium has a resistivity greater than or equal to a high resistivity threshold value;

[0025] Setting a to-be-tested transducer and / or a to-be-tested circuit in the test container by a test fixture; wherein the to-be-tested transducer is a transducer in an unsealed state;

[0026] Powering on an acoustic measurement module to perform function and acoustic tests on the to-be-tested transducer and / or the to-be-tested circuit.

[0027] Optionally, when the function and acoustic tests on the to-be-tested transducer and / or the to-be-tested circuit are performed, the method further comprises:

[0028] When it is monitored that the resistivity or temperature of the water medium enters a corresponding pre-warning threshold range, controlling an interlocking unit to power off the acoustic measurement module, and simultaneously controlling the purification module to cyclically purify the water medium;

[0029] During the cyclic purification process, when it is monitored that the resistivity or temperature of the water medium exceeds the pre-warning threshold range, controlling the interlocking unit to power on the acoustic measurement module for testing.

[0030] Optionally, before the to-be-tested transducer and / or the to-be-tested circuit are set in the test container by the test fixture, the method further comprises:

[0031] Coating a protective material on exposed components of the to-be-tested transducer and / or the to-be-tested circuit and curing the protective material;

[0032] After the function and acoustic tests on the to-be-tested transducer and / or the to-be-tested circuit are performed, the method further comprises:

[0033] Rinsing and drying the to-be-tested transducer and / or the to-be-tested circuit with deionized water.

[0034] According to another aspect of the present application, there is provided a transducer acoustic testing system comprising a transducer acoustic testing apparatus as described in any embodiment of the first aspect, or for performing a transducer acoustic testing method as described in any embodiment of the second aspect.

[0035] The transducer acoustic testing apparatus provided by the embodiments of the present application installs the transducer to be tested and / or the circuit to be tested in the test container through the test fixture, controls the purification module to purify the water to obtain the water medium with the resistivity greater than or equal to the high-resistivity threshold value, and provides the water medium to the test container. The un-sealed transducer to be tested is immersed in the high-resistivity water medium, and the acoustic measurement module connected thereto is used to test the function and the sound of the transducer to be tested and / or the circuit to be tested. In this way, the water medium is purified by the purification module, the resistivity of the water medium is greatly improved, and the conductivity is reduced, so that the acoustic test can be directly performed without sealing the transducer to be tested, thereby effectively avoiding the influence of the sealing material on the acoustic coupling of the transducer to be tested, ensuring the authenticity and accuracy of the test results, and being beneficial to improving the consistency of the acoustic test. The un-sealed transducer to be tested can complete the electro-acoustic-structure integrated test under the water medium, effectively shortening the iteration period of the transducer to be tested, and reducing the cost.

[0036] It should be understood that the content described in this part is not intended to identify key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative effort.

[0038] Figure 1 is a structural schematic diagram of a transducer acoustic testing apparatus provided by an embodiment of the present application;

[0039] Figure 2 is a structural schematic diagram of another transducer acoustic testing apparatus provided by an embodiment of the present application;

[0040] Figure 3 is a structural schematic diagram of another transducer acoustic testing apparatus provided by an embodiment of the present application;

[0041] Figure 4 is a structural schematic diagram of another transducer acoustic testing apparatus provided by an embodiment of the present application;

[0042] Figure 5is a flowchart of a transducer acoustic test method according to an embodiment of the present application;

[0043] Figure 6 is a flowchart of another transducer acoustic test method according to an embodiment of the present application. DETAILED DESCRIPTION

[0044] In order to make the personnel in the technical field better understand the present application scheme, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the scope of protection of the present application.

[0045] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0046] As described in the background, for acoustic testing of transducers in water or other conductive liquids, the related art almost always requires potting of the transducer, the direct reason for which is to achieve electrical insulation, and the extended reasons include waterproofing and environmental protection of the transducer, construction of acoustic matching and backing, and provision of a stable structure; and in order to obtain usable data, the state of the transducer to be tested is usually required to be consistent with the final application state to ensure the authenticity and accuracy of the data. Among the common paths of the existing engineering practices mentioned in the background, there are the following common problems: first, the potting resin changes the acoustic coupling and mass loading of the transducer, introducing systematic bias in the testing process; second, the acoustic impedance and viscosity of the oil medium are different from those of the water medium; third, the dry-wet separation scheme increases the complexity of the connection and sealing, resulting in a long iteration cycle and high cost of the transducer to be tested.

[0047] The first aspect due to the problems introduced by potting can specifically include the following six points. First, acoustic mismatch and response drift: the acoustic impedance of the potting material is usually inconsistent with the piezoelectric material and the water medium, so the potting material can be equivalent to a new matching layer and additional mass, thereby causing systematic shifts in resonance frequency, bandwidth, transmit voltage response, and receive sensitivity. Second, viscoelastic loss and temperature sensitivity: the potting material uses resins such as epoxy, polyurethane, and silicone, which have viscoelastic properties, and their loss factor changes with temperature and frequency, resulting in temperature drift of amplitude-frequency response and phase delay; if the glass transition temperature of the cured potting material is close to the operating temperature range of the transducer, the transducer will also exhibit reversible or irreversible performance drift. Third, solidification shrinkage and stress concentration: the solidification shrinkage of the potting resin will exert a preload on the piezoelectric sheet and matching layer, changing the coupling coefficient of the transducer; local shrinkage and mismatch with the thermal expansion of the substrate can easily lead to micro-cracks, voids, and delamination, forming acoustic scattering centers and potential electric field concentration points. Fourth, water absorption and dielectric change: most resin materials have a certain water absorption rate, and after long-term immersion during testing, the dielectric constant and leakage of the potting material as a transducer will increase, the insulation margin will decrease, and the mass load and damping will slowly change, thereby causing long-term stability and reproducibility problems. Fifth, manufacturing consistency challenge: when potting the transducer, slight deviations in mixing ratio, vacuum degassing, curing curve, and environmental humidity control can result in batch-to-batch potting differences; one-time curing makes it difficult to achieve "reversible parameter adjustment", and each iteration during the development stage requires new samples, affecting efficiency and cost. Sixth, maintenance and repair cost: once the resin is cured, it is almost impossible to reverse, and the cost of disassembly to locate the fault is high, and it is also difficult to ensure the consistency of resealing.

[0048] The second aspect due to the problems introduced by using non-water-based media (such as oil, fluorinated liquid, glycerol, etc.) can specifically include the following four points. First, insufficient acoustic equivalence: the sound speed, acoustic impedance, and viscosity of non-water-based media differ significantly from water medium, changing the radiation boundary conditions and viscous boundary layer, making it difficult to map the resonance, directivity, and radiation efficiency to the final use state in water. Second, viscosity and temperature coupling: the viscosity of oil-based media is highly sensitive to temperature, causing damping and threshold to drift with temperature; the waiting time for temperature control and steady state increases significantly, affecting test throughput. Third, cleaning and compatibility: oil residues can contaminate the transducer surface and fixtures, affecting subsequent bonding or potting; some oil-based media have swelling or compatibility risks with seals and adhesives, which can cause leakage and reliability problems over time. Fourth, safety, environmental protection, and cost: some oil-based media are flammable, volatile, or have odor management issues; high-purity fluorinated liquids are costly and require significant maintenance costs, and disposal after leakage also increases operating costs.

[0049] The third aspect can specifically include the following five points due to the problems introduced by keeping the dry and wet separation state. First, the design complexity and implementation difficulty are significantly increased: in order to keep the circuit dry, the transducer end wet, a sealed feedthrough, a pressure-resistant shell, a long-distance shielded cable and a multi-layer sealing structure need to be introduced, which brings unnecessary structure and increases electrical complexity and assembly difficulty; the thermal expansion mismatch between different materials, the compression permanent deformation of the O-ring, and other problems significantly increase the failure modes. Second, the measurement is not representative: long cable and additional connectors introduce distributed capacitance, leakage and mechanical coupling, which change the electrical-acoustic load and noise environment of the measured system; the reflection and diffraction of the fixture and the shell deviate the boundary conditions of the sound field from the final product form. Third, the cost and cycle are rising: the cost of special sealing, custom shell and pressure-resistant connector is high, the assembly and leakage inspection is time-consuming, and the rework rate is rising; the environmental and reliability verification for this also increases the non-recurrent engineering cost. Fourth, the value of transfer is low and waste is formed: since the transducer will still be filled during the production stage, the sealing, isolation and electrical layout design related to dry and wet separation are not retained in the mass production version, resulting in the design and process optimization invested in the early stage of the scheme being completely abandoned after transfer. Fifth, the safety and maintainability are limited: multiple seals and exposed connection points are prone to aging and leakage in long-term use, the maintenance window is shortened, and the risk management cost is rising.

[0050] Based on the above technical problems, the embodiments of the present application provide the following technical solutions:

[0051] The present application provides a transducer acoustic testing device. Figure 1 The structure diagram of the transducer acoustic testing device provided by the present application is shown in Figure 1. Figure 1 As shown in the figure, the transducer acoustic testing device 000 includes a test container 100, a purification module 200, an acoustic measurement module 300 and a control module 400.

[0052] The transducer to be tested and / or the circuit to be tested are installed in the test container 100 through the test fixture; wherein the transducer to be tested is a transducer in an unsealed state; the control module 400 is electrically connected with the purification module 200 and the acoustic measurement module 300 respectively, the purification module 200 is in communication with the test container 100, and the acoustic measurement module 300 is electrically connected with the transducer to be tested;

[0053] The control module 400 is used to control the purification module 200 to provide a water medium into the test container 100, so that the transducer to be tested and / or the circuit to be tested are immersed in the water medium; wherein the resistivity of the water medium is greater than or equal to a high resistivity threshold; and the control module 400 is used to control the acoustic measurement module 300 to perform function and acoustic testing on the transducer to be tested and / or the circuit to be tested.

[0054] Specifically, the test container 100 can be a tank type container, i.e., a closed water tank or a test tank. Exemplarily, the test container 100 includes a pressurizable pressure-resistant cavity, and a material of the test container 100 includes any one of perfluoroalkoxy (PFA), polytetrafluoroethylene (PTFE) and polyether ether ketone (PEEK). A component in the test container 100 that is in contact with the water medium can be selected from any one of the above materials, or can also be selected from high-purity stainless steel (which needs to control the use area at the electrode and perform surface passivation), ceramic or titanium alloy, and avoid using brass, carbon steel, ordinary silica gel and other materials that are easy to leach out. By using low-leaching materials as the material of the test container 100, the service life of the purified water medium can be effectively improved, the ions released into the water by the material in contact with the water medium are reduced, and the water medium can maintain a relatively high resistivity. In addition, an extremely thin inert material that does not change the acoustic path can also be used to quickly coat the surface of the test container 100, so that the purified water medium in the test container 100 can maintain a relatively high resistivity for a longer period of time, and the number and length of time of starting the purification module 200 can be reduced. Exemplarily, an inner wall of the test container 100 is provided with an inner lining structure, and the inner lining structure includes an underwater wedge-shaped sound absorption structure. By using the underwater wedge-shaped sound absorption structure to form the inner lining on the inner wall of the test container, it is beneficial to suppress acoustic reflection signals, ensure the repeatability of measurement of indexes such as transmission voltage response, receiving sensitivity, directivity, harmonics or distortion, and ensure the accuracy of repeated measurement.

[0055] The to-be-tested transducer and / or to-be-tested circuit are installed inside the test container 100 through the test fixture, wherein, in the embodiment of the present application, the to-be-tested transducer is a transducer prototype without potting, and the to-be-tested transducer is connected with the acoustic signal line and the power signal line through the test fixture. Exemplarily, the test fixture is provided with a grounding guard ring and an underwater shielded cable, which are used to drain the leakage current in the test process. The test fixture is a replaceable fixture, which contains an equipotential support and a guard ring electrode, and the guard ring electrode is arranged around the test fixture to drain the micro-leakage and reduce the influence on the to-be-tested circuit. The acoustic signal line and the power signal line connected with the to-be-tested transducer adopt the underwater shielded cable and fix the cable routing, which can avoid the wandering noise generated by the cable in the water medium. The surface of the to-be-tested circuit exposed to the water medium and / or the surface of the metal part in the test fixture and the surface of the part that may precipitate ions are all provided with a three-proofing paint or a thin inert coating to achieve isolation from the water medium. The material of the coating can be any one of acrylic, polyurethane, silicone or parylene, which is not limited herein. And the coating should avoid the acoustic coupling interface of the to-be-tested transducer and the necessary heat dissipation surface. The test fixture and the conductive connected signal line adopt equipotential design, which can suppress galvanic corrosion; the guard electrode or shielding structure is arranged around the exposed electrode, which can effectively reduce the local electric field and leakage current.

[0056] The purification module 200 can purify the water medium from impurities and particles to obtain a water medium with a resistivity greater than or equal to a certain high resistivity threshold, i.e. a high resistivity water medium; wherein the setting of the high resistivity threshold can be set according to actual needs, which is not limited herein; exemplarily, the high resistivity threshold can be kept at room temperature 25℃ ; preferably, the high resistivity threshold can be In a certain sense, the water medium obtained after the purification module 200 purifies is ultrapure water, which has low conductivity, and under the control of the control module 400, the ultrapure water is injected into the test container 100 to provide a liquid environment for the function and acoustic test of the to-be-tested transducer and / or to-be-tested circuit. By immersing the to-be-tested transducer and / or to-be-tested circuit in the ultrapure water provided by the purification module 200, the to-be-tested transducer can be used directly without being sealed for electrical insulation, and the acoustic test can be performed on the to-be-tested transducer connected to the acoustic measurement module 300, thereby effectively preventing the influence of the sealing material on the acoustic coupling of the to-be-tested transducer, ensuring the authenticity and accuracy of the test results, and being beneficial to improving the consistency of acoustic testing; and using the unsealed to-be-tested transducer can complete the electrical-acoustic-structural integrated test under the water medium, effectively shortening the iteration period of the to-be-tested transducer and reducing the cost. Since the ultrapure water has extremely low ionic strength, has a dissolution driving force, is easy to damage the metal surface oxide film and cause corrosion and ion leaching, direct current bias and local bubbles can accelerate electrochemical corrosion, and galvanic corrosion is easy to occur when dissimilar metals coexist and the potential difference is large, therefore, the material in contact with the ultrapure water can use a low-leaching material to reduce the influence of corrosion.

[0057] The transducer acoustic test device provided by the embodiment of the present application, the to-be-tested transducer and / or to-be-tested circuit are installed in the test container through the test fixture, the control module controls the purification module to purify the water, and the water medium with a resistivity greater than or equal to a high-resistivity threshold value is obtained and provided to the test container. The unsealed to-be-tested transducer is immersed in the high-resistivity water medium, and the function and acoustic test of the to-be-tested transducer and / or to-be-tested circuit are performed through the connected acoustic measurement module. In this way, the water medium is purified by the purification module, the resistivity of the water medium is greatly improved, the conductivity is reduced, the acoustic test can be directly performed without sealing the to-be-tested transducer, thereby effectively avoiding the influence of the sealing material on the acoustic coupling of the to-be-tested transducer, ensuring the authenticity and accuracy of the test results, and being beneficial to improving the consistency of acoustic testing; the unsealed to-be-tested transducer can complete the electrical-acoustic-structural integrated test under the water medium, effectively shortening the iteration period of the to-be-tested transducer and reducing the cost.

[0058] On the basis of the above-mentioned embodiments, the to-be-tested transducer and / or the to-be-tested circuit are optionally installed in the test container through the test fixture, and the replaceable matching layer or backing module and the replaceable acoustic module are also optionally assembled, stable contact with the to-be-tested piezoelectric element is achieved through mechanical clamping or micro-pressure preloading, the matching layer with different acoustic impedance or thickness and the weighted backing are provided, and therefore the equivalent mapping between the scheme using the un-potted transducer and the target potted scheme is established, the state of the test prototype is close to the final state, and the accuracy of the test result is improved. The replaceable matching layer module can be made of a plate or a film material close to the design target acoustic impedance, for example, polymethyl methacrylate, epoxy-based composite material or porous material, stable coupling is formed through mechanical clamping, and multiple sets of thicknesses can be configured to scan the bandwidth and sensitivity. The replaceable backing module can use high-damping absorption blocks or weighted backings, the damping is changed through an adjustable loading mechanism, and the ringing and bandwidth characteristics of different packaging schemes are simulated. Inert sheets or replaceable isolation sheets can be arranged between the module and the to-be-tested transducer to prevent particles or resin residues from entering the waterway.

[0059] On the basis of the above-mentioned embodiments, Figure 2 is another structure schematic diagram of a transducer acoustic testing device provided by an embodiment of the present application. Referring to Figure 2 Optionally, the purification module 200 comprises, in sequence, a magnetic pump 201, a filter 202, a mixed bed resin column 203, an ultraviolet module 204, a degassing unit 205 and a monitoring unit 206.

[0060] The degassing unit 205 is in communication with the water inlet of the test container 100, and the water outlet of the test container 100 is in communication with the filter 202; the purification module 200 is used to cyclically purify the water medium with a resistivity less than the high-resistivity threshold value according to the monitoring result of the performance of the water medium by the monitoring unit 206, so that the resistivity of the water medium reaches the high-resistivity threshold value.

[0061] Specifically, the purification module 200 can not only purify the water medium at one time, but also cyclically purify the water medium, so as to dynamically control the resistivity of the water medium, so that the resistivity of the water medium in which the to-be-tested transducer and / or the to-be-tested circuit are submerged in the test container 100 is dynamically maintained at a level higher than the high-resistivity threshold value, that is, the water medium in the test container 100 is guaranteed to be ultra-pure water with poor conductivity, so that the acoustic measurement module 300 can continuously perform normal acoustic testing on the to-be-tested transducer which has not been potted.

[0062] The start-stop of the magnetic pump 201 is used to control the start-stop of the circulation purification of the water medium by the purification module 200. The magnetic pump 201 can be made of low-shear and low-dissolution materials. The filter 202 can be a filter with a pore size of 0.2 μm to filter impurities and particles in the water medium. The ultraviolet module 204 can emit ultraviolet light with a wavelength of 185 nm or 254 nm to sterilize and disinfect the water medium. The degassing unit 205 can use a membrane contact degasser, and preferably, the degassing unit 205 can use nitrogen as a sweep gas. The monitoring unit 206 is used to monitor the related performance of the water medium in real time to ensure that the resistivity of the water medium in the test container 100 meets the requirements of the high resistivity threshold, so that the acoustic test can be normally performed.

[0063] On the basis of the above embodiments, continue to refer to Figure 2 Optionally, the monitoring unit 206 includes a resistivity sensor 2061 and a temperature sensor 2062.

[0064] The resistivity sensor 2061 is arranged at the water outlet of the purification module 200 and / or in the test container 100 to monitor the resistivity of the water medium in the purification module 200 and / or the test container 100.

[0065] The temperature sensor 2062 is arranged at the same position as the resistivity sensor 2061, and the temperature sensor 2062 is used to monitor the temperature of the water medium in the purification module 200 and / or the test container 100.

[0066] Specifically, the resistivity sensor 2061 is arranged at the water outlet of the purification module 200 to monitor the resistivity of the water medium in the purification module 200 in real time; the resistivity sensor 2061 is arranged in the test container 100 to monitor the resistivity of the water medium in the test container 100 in real time. Thus, when the resistivity of the water medium at the corresponding position is monitored to be lower than the high resistivity threshold, the magnetic pump 201 in the purification module 200 is controlled to operate by the control module 400 to circulate and purify the water medium, so that the resistivity of the water medium gradually increases to the high resistivity threshold.

[0067] The temperature sensor 2062 is arranged at the same position as the resistivity sensor 2061 to monitor the temperature of the water medium at the same position monitored by the resistivity sensor 2061, so as to ensure that the temperature of the water medium at the corresponding position meets the requirements of the normal test environment. Exemplarily, the temperature range of the water medium can be 10℃-35℃; preferably, the temperature is maintained at Or .

[0068] On the basis of the above embodiments, Figure 3is a structural schematic diagram of still another transducer acoustic testing device provided by the embodiment of the present application. Referring to Figure 3 Optionally, the control module 400 comprises a control unit 401, an interlocking unit 402 and an alarm unit 403.

[0069] The control unit 401 is electrically connected with the interlocking unit 402 and the alarm unit 403 respectively, and the interlocking unit 402 is linked with the monitoring unit 206;

[0070] The control unit 401 is configured to control the interlocking unit 402 to power off the acoustic measurement module 300 when the monitoring unit 206 monitors that the resistivity or temperature of the water medium enters the corresponding pre-warning threshold range, and to control the interlocking unit 402 to power on the acoustic measurement module 300 for testing when the monitoring unit 206 monitors that the resistivity or temperature of the water medium is out of the pre-warning threshold range, and to control the purification module 200 to cyclically purify the water medium.

[0071] The control unit 401 is further configured to control the alarm unit 403 to perform audible and visual alarm when the resistivity or temperature of the water medium enters the corresponding pre-warning threshold range.

[0072] Specifically, the interlocking unit 402 is electrically connected with the to-be-tested transducer connected with the magnetic drive pump 201 in the purification module 200 and the to-be-tested transducer connected with the acoustic measurement module 300 respectively, and the control unit 401 is electrically connected with the interlocking unit 402. When the monitoring unit 206 monitors that the resistivity of the water medium in the water circulation loop formed by the purification module 200 is lower than the high resistivity threshold, the control unit 401 controls the interlocking unit 402 to power on the magnetic drive pump 201 in the purification module 200, so that the purification module 200 starts to purify the water medium in circulation to increase the resistivity of the water medium. At this time, the interlocking unit 402 can still control the acoustic measurement module 300 to be in the powered-on state to perform acoustic testing on the to-be-tested transducer and / or the to-be-tested circuit. When the monitoring unit 206 monitors that the resistivity of the water medium is lower than the resistivity warning threshold or the temperature of the water medium is higher than the temperature warning threshold, it indicates that the measurement environment at this time cannot meet the conditions for normal and safe operation of the acoustic measurement module 300. Therefore, the control unit 401 controls the interlocking unit 402 to power on the magnetic drive pump 201 in the purification module 200, so that the purification module 200 starts to purify the water medium in circulation to increase the resistivity of the water medium. At the same time, the control unit 401 controls the interlocking unit 402 to power off the acoustic measurement module 300 to suspend the acoustic testing on the to-be-tested transducer and / or the to-be-tested circuit, so as to protect the to-be-tested transducer from being damaged. The resistivity warning threshold is a lower resistivity relative to the high resistivity threshold, which can be set by the user as needed and is not limited herein. When the purification module 200 purifies the water medium to a resistivity higher than the resistivity warning threshold, the interlocking unit 402 can control the acoustic measurement module 300 to be powered on again to continue the acoustic testing on the to-be-tested transducer.

[0073] In addition, when the monitoring unit 206 monitors that the resistivity or the temperature of the water medium enters the corresponding warning threshold range, the alarm unit 403 in the control module 400 can issue an alarm sound and / or an alarm light under the control of the control unit 401 to give a fault warning to the relevant staff. During the fault warning process, the test environment data can be continuously recorded and can be output together with the acoustic test result.

[0074] On the basis of the above-mentioned embodiments, Figure 4 is another structure schematic diagram of a transducer acoustic testing device provided by the embodiment of the present application. Referring to Figure 4 Optionally, the acoustic measurement module 300 comprises an acoustic wave conversion link 310 and / or an electric energy conversion link 320.

[0075] The acoustic wave conversion link 310 comprises a signal amplifier 312, a power amplifier 313 and a first to-be-tested transducer 311 connected in sequence; the first to-be-tested transducer 311 comprises a transmitting transducer;

[0076] The electric energy conversion link 320 comprises a second to-be-tested transducer 322, a modulation circuit 323 and a sampling circuit 324 connected in sequence.

[0077] The acoustic wave conversion link 310 is used for performing acoustic testing of the first to-be-tested transducer 311 converting electric energy into acoustic waves.

[0078] Specifically, in the functional and acoustic testing process, the acoustic wave conversion link 310 is used for performing acoustic testing of the first to-be-tested transducer 311 converting electric energy into acoustic waves, and the first to-be-tested transducer 311 used in the testing process is a transmitting transducer. In the functional and acoustic testing process, the electric energy conversion link 320 is used for performing acoustic testing of the second to-be-tested transducer 322 converting acoustic waves into electric signals, and the second to-be-tested transducer 322 used in the testing process is a receiving transducer. In the electric energy conversion link 320, the second to-be-tested transducer 322 can also be a standard hydrophone. The standard hydrophone is also a receiving transducer, which is often used as a standard gauge and can better convert acoustic waves into electric signals, so that the transmitting waveform of the transmitting transducer can be directly measured, and the received waveform can also be compared with the waveform received by the receiving transducer.

[0079] The power amplifier 313 and the to-be-tested circuit are simultaneously included in the cut-off link of the interlocking unit 402, so that when it is monitored that the resistivity of the water medium is lower than the resistivity warning threshold or the temperature of the water medium is higher than the temperature warning threshold, the interlocking unit 402 can simultaneously power off the power amplifier 313 and the to-be-tested circuit in the acoustic measurement module 300, and record the environmental parameters and the time stamp throughout the process, so as to ensure that the acoustic measurement module 300 and the corresponding to-be-tested transducer are not damaged.

[0080] After the acoustic testing is completed, the to-be-tested transducer and / or the to-be-tested circuit should be removed from the water medium in time and dried sufficiently, the single soaking time is strictly limited, and whether the coating of the to-be-tested transducer and / or the to-be-tested circuit is whitened, foamed or peeled off before and after the testing should be checked. If defects are found, the to-be-tested transducer and / or the to-be-tested circuit should be repainted or replaced, and after the testing is completed, the to-be-tested transducer and / or the to-be-tested circuit should be washed with deionized water and dried at low temperature, so as to avoid cleaning with a salt-containing cleaner.

[0081] The embodiment of the present application also provides a transducer acoustic testing method. Figure 5 is a flowchart of a transducer acoustic testing method provided by the embodiment of the present application. Referring to Figure 5 The transducer acoustic testing method specifically comprises the following steps:

[0082] S110, starting a purification module to purify the water medium and injecting the purified water medium into a test container; wherein the resistivity of the water medium is greater than or equal to a high resistivity threshold.

[0083] Specifically, the purification module is powered on to purify the water medium, remove impurities and particles in the water medium, and increase the resistivity of the water medium to be greater than or equal to a high resistivity threshold, thereby reducing the conductivity performance. The dissolved gas in the purified water medium can be treated by degassing, thereby providing a test environment for acoustic testing of the to-be-tested transducer.

[0084] S120, setting the to-be-tested transducer and / or to-be-tested circuit in the test container through the test fixture; wherein the to-be-tested transducer is a transducer in an unsealed state.

[0085] Specifically, the unsealed transducer is used as the to-be-tested transducer, the to-be-tested transducer is fixedly connected to the test fixture, and the to-be-tested transducer and / or to-be-tested circuit are installed in the test container through the test fixture, so that the to-be-tested transducer is immersed in the high-resistivity water medium in the test container.

[0086] S130, powering on the acoustic measurement module to perform function and acoustic testing on the to-be-tested transducer and / or to-be-tested circuit.

[0087] Specifically, the acoustic measurement module is powered on to start function and acoustic testing on the connected to-be-tested transducer and / or to-be-tested circuit.

[0088] The transducer acoustic testing method provided by the embodiment of the present application purifies the water medium through the purification module before testing to obtain a high-resistivity water medium. The unsealed transducer is used as the to-be-tested transducer, and the to-be-tested transducer and / or to-be-tested circuit are installed in the test container through the test fixture and immersed in the high-resistivity water medium. The acoustic measurement module is powered on to perform function and acoustic testing on the to-be-tested transducer and / or to-be-tested circuit. In this way, the high-resistivity water medium obtained by purifying the water medium provides a test environment, so that the to-be-tested transducer can be electrically insulated without being sealed and can be directly immersed in the water medium for acoustic testing, effectively avoiding the influence of the sealing material on the acoustic coupling of the to-be-tested transducer, ensuring the authenticity and accuracy of the test results, and being conducive to improving the consistency of acoustic testing. The unsealed to-be-tested transducer can complete the electrical-acoustic-structural integrated testing under the water medium, effectively shortening the iteration period of the to-be-tested transducer and reducing the cost.

[0089] On the basis of the above-mentioned embodiment, when the to-be-tested transducer and / or to-be-tested circuit are functionally and acoustically tested in step S130, the following steps are further included:

[0090] When it is monitored that the resistivity or temperature of the water medium enters the corresponding pre-warning threshold range, the interlocking unit is controlled to power off the acoustic measurement module, and the purification module is controlled to cyclically purify the water medium.

[0091] Specifically, when the monitoring unit monitors that the resistivity of the water medium enters the resistivity pre-warning threshold range, or monitors that the temperature of the water medium enters the temperature pre-warning threshold range, the control module can control the interlocking unit to power off the acoustic measurement module, so as to protect the to-be-tested transducer from being damaged due to short circuit; meanwhile, the control module can control the interlocking unit to control the purification module in linkage, and start the purification module to circulate and purify the water medium, so as to increase the resistivity of the water medium, and make the resistivity meet the requirement of acoustic testing of the to-be-tested transducer.

[0092] In the circulating purification process, when the resistivity or the temperature of the water medium exceeds the pre-warning threshold range, the control interlocking unit is controlled to power on the acoustic measurement module for testing.

[0093] Specifically, in the circulating purification process of the purification module, the resistivity of the water medium gradually increases, or the temperature of the water medium gradually decreases. When the monitoring unit monitors that the resistivity of the water medium is not in the resistivity pre-warning threshold range, or the temperature of the water medium is not in the temperature pre-warning threshold range, the control module can control the interlocking unit to power on the acoustic measurement module again, so as to continue the acoustic testing of the to-be-tested transducer and / or the to-be-tested circuit. In this way, the to-be-tested transducer and / or the to-be-tested circuit can be protected throughout the testing process, so that the testing environment provided by the water medium can maintain a high resistivity, thereby improving the authenticity and accuracy of the test results.

[0094] On the basis of the above-mentioned embodiments, Figure 6 is a flowchart of another transducer acoustic testing method provided by the embodiments of the present application. Referring to Figure 6 , the transducer acoustic testing method specifically includes the following steps:

[0095] S210, starting the purification module to purify the water medium and injecting the water medium into the test container; wherein the resistivity of the water medium is greater than or equal to a high resistivity threshold.

[0096] S220, coating the exposed components of the to-be-tested transducer and / or the to-be-tested circuit with a protective material and curing.

[0097] Specifically, the components of the to-be-tested transducer that may precipitate ions and / or the metal components in the to-be-tested circuit can be sprayed or dipped with a three-proofing paint on the surface to form a protective layer and be cured, so as to protect the to-be-tested transducer and / or the to-be-tested circuit from metal corrosion. The conventional three-proofing paint is preferably thin-coated to balance assembly and heat dissipation. If secondary welding is required after coating, a process window needs to be reserved or a material that can be reworked needs to be selected.

[0098] S230, setting the to-be-tested transducer and / or the to-be-tested circuit in the test container through a test fixture; wherein the to-be-tested transducer is a transducer in an un-sealed state.

[0099] S240, power on the acoustic measurement module to perform function and acoustic tests on the to-be-tested transducer and / or to-be-tested circuit.

[0100] S250, flush and dry the to-be-tested transducer and / or to-be-tested circuit with deionized water.

[0101] Specifically, after the test is completed, the material coated on the surface of the to-be-tested transducer and / or to-be-tested circuit or the deposited particles are flushed clean by deionized water or isopropyl alcohol, sufficiently dried, and a basic insulation test is performed on the to-be-tested transducer and to-be-tested circuit to confirm that there are no pinholes or bubbles in the to-be-tested transducer and to-be-tested circuit.

[0102] The embodiments of the present application also provide a transducer acoustic test system. The transducer acoustic test system comprises the transducer acoustic test device provided by any of the above embodiments, or performs the transducer acoustic test method provided by any of the above embodiments by using the transducer acoustic test system, so as to directly immerse the to-be-tested transducer in a high-resistivity water medium for underwater function and acoustic test without potting the to-be-tested transducer. Therefore, the transducer acoustic test system has the same beneficial effects as the transducer acoustic test device or the transducer acoustic test method provided by any of the above embodiments, and will not be described here again.

[0103] The above specific embodiments do not constitute a limitation on the protection scope of the present application. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent replacements, and improvements within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A transducer acoustic testing device, characterized in that, include: Test container, purification module, acoustic measurement module, and control module; The transducer under test and / or the circuit under test are mounted in the test container using a test fixture; wherein the transducer under test is an unfilled transducer; the control module is electrically connected to the purification module and the acoustic measurement module respectively, the purification module is connected to the test container, and the acoustic measurement module is electrically connected to the transducer under test; The control module is used to control the purification module to provide an aqueous medium to the test container, so that the transducer under test and / or the circuit under test are immersed in the aqueous medium; wherein the resistivity of the aqueous medium is greater than or equal to a high resistivity threshold; and the control module is used to control the acoustic measurement module to perform functional and acoustic tests on the transducer under test and / or the circuit under test.

2. The transducer acoustic testing device according to claim 1, characterized in that, The purification module includes a magnetic pump, a filter, a mixed bed resin column, an ultraviolet module, a degassing unit, and a monitoring unit connected in sequence. The degassing unit is connected to the water inlet of the test container, and the water outlet of the test container is connected to the filter; the purification module is used to circulate and purify the water medium with a resistivity less than the high resistivity threshold according to the monitoring results of the monitoring unit on the performance of the water medium, so as to make the resistivity of the water medium reach the high resistivity threshold.

3. The transducer acoustic testing device according to claim 2, characterized in that, The monitoring unit includes a resistivity sensor and a temperature sensor; The resistivity sensor is disposed at the outlet of the purification module and / or in the test container, for monitoring the resistivity of the water medium in the purification module and / or the test container; The temperature sensor is positioned in the same location as the resistivity sensor, and the temperature sensor is used to monitor the temperature of the water medium in the purification module and / or the test container.

4. The transducer acoustic testing device according to claim 3, characterized in that, The control module includes: a control unit, an interlocking unit, and an alarm unit; The control unit is electrically connected to the interlocking unit and the alarm unit respectively, and the interlocking unit is linked with the monitoring unit; The control unit is used to control the interlocking unit to cut off the power to the acoustic measurement module when the monitoring unit detects that the resistivity or temperature of the water medium enters the corresponding warning threshold range, and to control the purification module to circulate and purify the water medium in conjunction with the monitoring unit, so as to control the interlocking unit to power on the acoustic measurement module for testing when the monitoring unit detects that the resistivity or temperature of the water medium is outside the warning threshold range. The control unit is also used to control the alarm unit to issue an audible and visual alarm when the resistivity or temperature of the water medium enters the corresponding warning threshold range.

5. The transducer acoustic testing device according to claim 1, characterized in that, The acoustic measurement module includes a sound wave conversion link and / or an electrical energy conversion link; The acoustic wave conversion link includes a signal amplifier, a power amplifier, and a first transducer under test connected in sequence; the first transducer under test includes a transmitting transducer. The power conversion link includes a second transducer under test, a modulation circuit, and a sampling circuit connected in sequence; the second transducer under test includes a receiving transducer or a standard hydrophone.

6. The transducer acoustic testing device according to claim 1, characterized in that, The inner wall of the test container is provided with an inner lining structure, which includes an underwater wedge-shaped sound-absorbing structure.

7. The transducer acoustic testing device according to claim 1, characterized in that, The test container includes a pressurizable and pressure-resistant chamber, and the material of the test container includes any one of soluble polytetrafluoroethylene, polytetrafluoroethylene, and polyetheretherketone.

8. The transducer acoustic testing device according to claim 1, characterized in that, The test fixture is equipped with a grounding ring and an underwater shielded cable, which are used to divert leakage current during the test.

9. A transducer acoustic testing method, characterized in that, include: The purification module is activated to purify the water medium and inject it into the test container; wherein the resistivity of the water medium is greater than or equal to the high resistivity threshold. The transducer under test and / or circuit under test are placed in the test container using a test fixture; wherein the transducer under test is an unfilled transducer. Power on the acoustic measurement module to perform functional and acoustic tests on the transducer under test and / or the circuit under test.

10. The transducer acoustic testing method according to claim 9, characterized in that, The functional and acoustic testing of the transducer under test and / or the circuit under test also includes: When the resistivity or temperature of the water medium is detected to enter the corresponding warning threshold range, the control interlock unit cuts off the power to the acoustic measurement module and controls the purification module to circulate and purify the water medium. During the circulating purification process, if the resistivity or temperature of the water medium exceeds the warning threshold range, the interlocking unit is controlled to power on the acoustic measurement module for testing.

11. The transducer acoustic testing method according to claim 9, characterized in that, Before setting the transducer under test and / or circuit under test in the test container using the test fixture, the method further includes: Apply a protective material to the transducer under test and / or the exposed components of the circuit under test, and then cure it. After performing functional and acoustic tests on the transducer under test and / or the circuit under test, the method further includes: The transducer under test and / or the circuit under test are rinsed and dried with deionized water.

12. A transducer acoustic testing system, characterized in that, Includes the transducer acoustic testing apparatus as described in any one of claims 1-8, or for performing the transducer acoustic testing method as described in any one of claims 9-11.

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