Multi-beam parametric array transmit-receive transducer test system and method

Abstract

The application provides a high-frequency and low-frequency synergic multi-beam parametric array transmitting and receiving transducer test system and method, wherein the system comprises a high-frequency and low-frequency synergic multi-beam transmitting and receiving transducer array, a multi-beam signal transmitting subsystem, a transducer array hanging control subsystem and a multi-beam signal receiving and collecting subsystem; the multi-beam transmitting and receiving transducer array comprises a multi-beam parametric transmitting transducer, a multi-beam high-frequency and low-frequency receiving transducer, an electronic cabinet, a multi-channel wideband receiving matching circuit, a transmitting watertight multi-core cable and a receiving watertight multi-core cable; the multi-beam signal transmitting subsystem comprises a digital signal transmitting device and a multi-channel digital signal amplifying device. The multi-channel digital signal transmitting device of the application is flexible in channel selection, the multi-channel digital signal amplifying device is stable and accurate in output, the parametric array and the receiving transducer are designed in multiple channels and have obvious integration advantages, each subsystem is accurately and completely linked and cooperatively operated, and various performance tests can be performed on the transducer array.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of shallow stratum profile detection and detection, identification and classification of sunken and buried targets, and in particular to a multi-beam parametric array transmitting and receiving transducer test system and method with high and low frequency cooperation. BACKGROUND

[0002] In the field of seabed detection technology, the conventional seabed profiler has obvious shortcomings. Its wide beam results in low radial resolution, is easily disturbed by sea surface echoes, and the wide beam causes large time delay difference between the direction-finding echo and the forward echo, greatly reducing the axial resolution. Due to the large sound absorption of seabed stratum, only low frequency (a few hundred to a few thousand hertz) sound waves can penetrate to a depth of tens to hundreds of meters below the seabed. The conventional linear sonar requires a large transducer aperture to achieve a narrow beam, while the parametric array technology can meet the related requirements due to its low frequency, small size and high directivity. The high directivity sound beam can avoid boundary multipath interference and reverberation, and can also generate low frequency narrow beam transmission signals. The transducer is small in size and can simultaneously obtain low frequency (difference frequency) and high frequency (original frequency) scattering sound fields of underwater targets, and is suitable for underwater AUV, ROV platform and other operations of sunken and buried target detection.

[0003] In the development of parametric array transducers, it is crucial to master their acoustic performance, as it will affect the quality of subsequent signal processing and image reconstruction of the sonar system. However, the parametric array generates difference frequency signals with very low efficiency, requiring high original frequency signal sources to improve the non-linear conversion rate, which requires high power transmission. Most of the current parametric array transducer acoustic performance tests are single-channel signal tests. When facing the test of high-power multi-beam parametric array transducers, it is difficult to meet the test and use requirements, and there is a lack of systematic and orderly multi-beam parametric array transducer performance test methods and systems. For high-frequency broadband parametric array transducers, to prevent transmission signal distortion, the driving power amplifier needs to be designed for wideband. However, commercial high-frequency broadband power amplifiers have the problems of large size, high price, single-channel transmission and low power. If multiple power amplifiers are used for driving, the consistency is poor, the equipment is bulky and occupies a large space. The sound field of the parametric array transducer includes high-frequency original frequency signals and low-frequency difference frequency signals. The total energy of the difference frequency wave increases with the increase of the propagation distance (after deducting the absorption effect), so the sound source level measured in the near field is lower than that measured in the far field. Therefore, accurate measurement of the parametric array sound source level requires a sufficient distance from the sound source, which requires a large test site, resulting in high test cost. Therefore, it is extremely critical to simultaneously acquire and display the acoustic performance of high-frequency and low-frequency signals during the test and collection of signals, and to provide real-time feedback to the test personnel.

[0004] In addition, current parametric array transducers are mostly only transmitting transducer devices. If detection is required, a separate receiving transducer or a standard hydrophone is needed. The separate production of the receiving transducer will make the system device complex, increase the installation complexity and uncertainty during testing, and if the transmitting and receiving transducers are integrated, the electrical leakage signal will be difficult to eliminate due to the single circuit system, resulting in a very low receiving signal-to-noise ratio, reducing the detection precision and accuracy. The use of standard hydrophones also has the problems of multiple devices and complex installation, and the standard hydrophone is a single receiving channel, which cannot be detected by multiple channels and cannot obtain comprehensive sound field information. If the number of standard hydrophones is increased, the cost will also increase, and the influence of the array on the received sound field also needs to be considered, further increasing the detection complexity.

[0005] Through the search of patent documents, it is found that the invention patent with the acceptance number CN202110664115 discloses an in-situ shallow profile system based on a parametric array. The patent focuses on the protection of its transceiver integrated circuit. The same transducer is used for transmission and reception in the system, and the receiving signal is easily affected by the transmission circuit and signal interference, resulting in high noise and low signal-to-noise ratio. The invention patent with the acceptance number CN202211209919 discloses a parametric array sound source device, system and control method. The patent mainly protects the parametric array transmission system, which only has transmission function, and the receiving parametric array signal needs additional receiving transducer and receiving circuit. The test system in the master's thesis "Acoustic Parametric Array and Its Test Technology Research" by Nie Xinhua in 2009 is a double-channel transmitting parametric transducer, which cannot transmit multiple beams and high power, the difference frequency signal conversion efficiency is low, the receiving transducer is a capacitive sensor, the receiving frequency is low, and only low-frequency sound signals can be received. The test system and transducer are only used in air.

[0006] In summary, in view of the problems of the prior art, it is a key task to study a multi-beam parametric array transmitting and receiving transducer test system and method with high-frequency and low-frequency cooperative work. SUMMARY

[0007] In view of the defects in the prior art, the purpose of the present application is to provide a multi-beam parametric array transmitting and receiving transducer test system and method with high-frequency and low-frequency cooperative work.

[0008] The multi-beam parametric array transmitting and receiving transducer test system with high-frequency and low-frequency cooperative work provided by the present application comprises: a multi-beam transmitting and receiving transducer array with high-frequency and low-frequency cooperative work, a multi-beam signal transmitting subsystem, a transducer array suspension control subsystem and a multi-beam signal receiving and collecting subsystem.

[0009] The high-frequency and low-frequency synergic multi-beam transmitting and receiving transducer array comprises a multi-beam parametric transmitting transducer, a multi-beam high-frequency and low-frequency receiving transducer, an electronic cabinet, a multi-channel broadband receiving matching circuit, a transmitting watertight multi-core cable and a receiving watertight multi-core cable.

[0010] The multi-beam signal transmitting subsystem comprises a digital signal transmitting device and a multi-channel digital signal amplifying device, the digital signal transmitting device comprises a display device and multi-channel digital signal transmitting software, and the multi-channel digital signal amplifying device is a multi-channel high-frequency broadband power amplifier.

[0011] The transducer array hanging control subsystem comprises a wireless control turntable system, a flange and a transducer clamping device, the transducer clamping device is connected with the flange, and the transducer clamping device is connected with the back of the electronic cabinet.

[0012] The multi-beam signal receiving and collecting subsystem comprises a multi-channel receiving device and a multi-channel collecting device, the multi-channel receiving device comprises a standard hydrophone, a filter and an oscilloscope, and the multi-channel collecting device comprises a multi-channel NI collecting device, multi-channel signal collecting software and a display device.

[0013] Preferably, the multi-beam parametric transmitting transducer and the multi-beam high-frequency and low-frequency receiving transducer are mounted on the same back plate and integrated by polyurethane pouring, and the radiation surfaces are located on the same horizontal plane, thereby forming a high-frequency and low-frequency synergic multi-beam transmitting and receiving transducer array integrating transmitting and receiving high-frequency signals and low-frequency signals.

[0014] Preferably, the high-frequency and low-frequency synergic multi-beam transmitting and receiving transducer array is fixed with the electronic cabinet through screws at the back thereof, and the transmitting watertight multi-core cable and the receiving watertight multi-core cable are respectively mounted on the non-adjacent two sides of the electronic cabinet.

[0015] Preferably, the multi-beam parametric transmitting transducer and the multi-beam high-frequency and low-frequency receiving transducer are both broadband transducers and each comprises a transducing material, a matching layer and a pressure-resistant backing, the transducing material is made of piezoelectric composite material which is cut and filled with epoxy resin by piezoelectric ceramic, the matching layer is bonded to the radiation surface of the piezoelectric composite material, and the pressure-resistant backing is bonded to the back of the piezoelectric composite material.

[0016] Preferably, the multi-beam parametric transmitting transducer and the multi-beam high-low frequency receiving transducer are both multi-channel linear arrays, and both are designed in a multi-channel design to work in a multi-beam mode to realize beam rotation of no less than ±30°, and the multi-beam parametric transmitting transducer is designed to complete transmission of a primary frequency bandwidth of no less than 85kHz-115kHz and a difference frequency bandwidth of 2kHz-20kHz.

[0017] Preferably, the multi-channel digital signal transmitting software is visual operation software edited based on MATLAB and has a channel selection function.

[0018] Preferably, the lower end of the transducer clamping device is fixed to the back of the electronic cabinet body through a screw, and then rigidly connected to the multi-beam parametric transmitting transducer and the multi-beam high-low frequency receiving transducer; the upper end of the transducer clamping device is rigidly connected to the flange plate through a screw; the flange plate is rigidly connected to the wireless control turntable system through a screw; and the multi-beam transmitting-receiving transducer array working in cooperation with high and low frequencies is rigidly connected to the wireless control turntable system.

[0019] Preferably, the standard hydrophone receives the sound signals transmitted and conducted by the multi-beam parametric transmitting transducer, and converts the sound signals into electrical signals, and then obtains a high-frequency primary frequency signal and a low-frequency difference frequency signal through a filter, and then displays the two channels through an oscilloscope, and the multi-channel signal acquisition software receives the synchronization signals sent by the multi-channel digital signal amplifying device, and synchronously controls the wireless control turntable system to rotate or be stationary, and simultaneously collects and displays the two-channel signals received by the oscilloscope on a display device.

[0020] Preferably, the multi-beam high-low frequency receiving transducer receives sound signals, the sound signals are sound signals transmitted and conducted by the multi-beam parametric transmitting transducer, emitted or scattered by a target to be measured or an obstacle, or sound signals transmitted and conducted by a standard sound source, the multi-beam high-low frequency receiving transducer converts the received multi-channel sound signals into electrical signals, and the generated electrical signals are compensated through a multi-channel wideband receiving matching circuit, and then conducted to a multi-channel NI acquisition device through a receiving watertight multi-core cable.

[0021] The application also provides a multi-beam parametric array transmitting-receiving transducer test method working in cooperation with high and low frequencies, which adopts the multi-beam parametric array transmitting-receiving transducer test system working in cooperation with high and low frequencies.

[0022] Step S1: a multi-channel digital signal transmitting software sends a digital signal instruction to drive a multi-channel digital signal amplifying device to work.

[0023] Step S2: after receiving the instruction, the multi-channel digital signal amplifying device drives the multi-beam parametric transmitting transducer to vibrate to generate sound signals through a water medium.

[0024] Step S3, the multi-channel digital signal amplification device sends a synchronization signal at the same time, and transmits to the multi-beam signal receiving and collecting subsystem;

[0025] Step S4, the multi-beam high-frequency and low-frequency receiving transducer receives the sound signal conducted through the water medium, and converts it into a multi-channel electric signal, at the same time, the multi-beam signal receiving and collecting subsystem receives the synchronization signal sent by the multi-channel digital signal amplification device, the multi-channel signal collecting software controls the wireless control turntable system to rotate or be stationary, and after a delay, the multi-channel signal receiving and collecting starts.

[0026] Compared with the prior art, the present application has the following beneficial effects:

[0027] 1, The multi-channel digital signal transmitting device adopted by the present application has a channel selection function, which can flexibly switch the driving signal transmission between single channel and full multi-channel, and is flexible to use.

[0028] 2, The multi-channel digital signal amplification device adopted by the present application is a multi-channel high-frequency wideband power amplifier, and the multi-channel characteristics effectively avoid the inconsistency problem of multiple power amplifiers used together, and ensure stable energy output; the high-frequency wideband design effectively prevents distortion of the transmitted signal, ensures stable and accurate transmission signal, and highly restores the real signal.

[0029] 3, The parametric array transmitting transducer and the high-frequency and low-frequency receiving transducer adopted by the present application are both multi-channel designs, support multi-beam working mode, and can achieve a beam rotation of not less than ±30°. The multi-beam parametric array transmitting transducer and the multi-beam high-frequency and low-frequency receiving transducer are integrated designed, which not only can transmit high-frequency original frequency wideband signals and synchronously generate low-frequency difference frequency signals, but also can receive high-frequency and low-frequency signals at the same time, and has the advantages of convenient installation and small size. The integrated multi-beam high-frequency and low-frequency receiving transducer can efficiently receive high-frequency and low-frequency signals, and has excellent signal-to-noise ratio. Compared with a single parametric array transceiver integrated transducer, the multi-beam parametric array transmitting transducer and the multi-beam high-frequency and low-frequency receiving transducer are designed separately, which effectively eliminates the electrical noise interference caused by circuit integration.

[0030] 4, The multi-beam signal receiving and collecting subsystem, the multi-channel digital signal amplification device and the wireless control turntable system of the present application realize linkage and collaborative work through the synchronization signal, which effectively ensures the accuracy and integrity of signal collection, and completely avoids the occurrence of wrong sampling and missing sampling.

[0031] 5、The high-frequency low-frequency synergistic multi-beam transmitting-receiving transducer array of the present application can perform various performance tests, including but not limited to the natural directivity test of the high-frequency fundamental frequency of the single-channel or multi-channel parametric array transmitting transducer, the natural directivity test of the single-channel or multi-channel difference frequency low frequency, the natural directivity test of the high-frequency fundamental frequency and the difference frequency low frequency after beam control, the single-channel or multi-channel sending voltage response test, the single-channel or multi-channel maximum sound source level test, the high-frequency natural directivity test of the single-channel or multi-channel high-frequency receiving transducer, the low-frequency natural directivity test of the single-channel or multi-channel low-frequency receiving transducer, the high-frequency and low-frequency directivity test after beam control, and the single-channel or multi-channel receiving sensitivity test. BRIEF DESCRIPTION OF DRAWINGS

[0032] Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments thereof, read in conjunction with the accompanying drawings:

[0033] Figure 1 A high-frequency low-frequency synergistic multi-beam parametric array transmitting-receiving transducer test system diagram in the embodiment of the present application;

[0034] Figure 2 A high-frequency low-frequency synergistic multi-beam transmitting-receiving transducer array in the embodiment of the present application;

[0035] Figure 3 A high-frequency low-frequency synergistic multi-beam parametric array transmitting-receiving transducer block diagram in the embodiment of the present application;

[0036] Figure 4 A high-frequency low-frequency synergistic multi-beam parametric array transmitting-receiving transducer test system working flowchart in the embodiment of the present application. DETAILED DESCRIPTION

[0037] The present application will be described in detail below with specific embodiments. The following embodiments will help those skilled in the art to further understand the present application, but do not limit the present application in any form. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of changes and improvements can be made. These all belong to the protection scope of the present application.

[0038] Example 1:

[0039] Figure 1 A high-frequency low-frequency synergistic multi-beam parametric array transmitting-receiving transducer test system diagram in the embodiment of the present application.

[0040] As Figure 1As shown, the embodiment provides a high-frequency and low-frequency synergic multi-beam parametric array transmitting and receiving transducer test system, which comprises a high-frequency and low-frequency synergic multi-beam transmitting and receiving transducer array, a multi-beam signal transmitting subsystem, a transducer array suspension control subsystem and a multi-beam signal receiving and collecting subsystem.

[0041] The high-frequency and low-frequency synergic multi-beam transmitting and receiving transducer array comprises a multi-beam parametric transmitting transducer, a multi-beam high-frequency and low-frequency receiving transducer, an electronic cabinet, a multi-channel broadband receiving matching circuit, a transmitting watertight multi-core cable and a receiving watertight multi-core cable.

[0042] Figure 2 The high-frequency and low-frequency synergic multi-beam transmitting and receiving transducer array in the embodiment.

[0043] As shown, Figure 2 The multi-beam parametric transmitting transducer and the multi-beam high-frequency and low-frequency receiving transducer are installed on the same back plate and integrated by polyurethane pouring, the radiating surfaces are located on the same horizontal plane, and the high-frequency and low-frequency synergic multi-beam transmitting and receiving transducer array integrating transmitting and receiving high-frequency signals and low-frequency signals is formed.

[0044] Figure 3 The high-frequency and low-frequency synergic multi-beam parametric array transmitting and receiving transducer structural diagram in the embodiment.

[0045] As shown, Figure 3 The high-frequency and low-frequency synergic multi-beam transmitting and receiving transducer array back is fixed with the electronic cabinet by screws; the transmitting watertight multi-core cable and the receiving watertight multi-core cable are respectively installed on the non-adjacent two sides of the electronic cabinet, which is convenient for installation and avoids mutual entanglement, and is conducive to later test installation. The back of the electronic cabinet is provided with a hole for connecting with the transducer suspension control subsystem.

[0046] The multi-beam parametric transmitting transducer and the multi-beam high-frequency and low-frequency receiving transducer are both broadband transducers, and each comprises a transducing material, a matching layer and a pressure-resistant backing. The transducing material adopts piezoelectric composite material which is made by cutting piezoelectric ceramic and filling epoxy resin; the matching layer is bonded to the radiating surface of the piezoelectric composite material; and the pressure-resistant backing is bonded to the back of the piezoelectric composite material.

[0047] The multi-beam parametric transmitting transducer and the multi-beam high-frequency low-frequency receiving transducer are both multi-channel linear arrays, and both are designed in a multi-channel mode to perform a multi-beam operation mode, and can realize a beam rotation of not less than ±30°. The multi-beam parametric transmitting transducer and the multi-beam high-frequency low-frequency receiving transducer are designed in an integrated mode, and are simple to install and small in size. The multi-beam high-frequency low-frequency receiving transducer in the integrated body can simultaneously effectively receive high-frequency signals and low-frequency signals, and has a high signal-to-noise ratio. The multi-beam parametric transmitting transducer is designed to have a transmitting original frequency bandwidth that can be selected but is not limited to 85kHz-115kHz, and a difference frequency bandwidth of 2kHz-20kHz. Compared with a single parametric array transceiving integrated transducer, the multi-beam parametric transmitting transducer and the multi-beam high-frequency low-frequency receiving transducer are designed in a split mode, which can avoid the electrical noise caused by circuit integration.

[0048] The multi-beam signal transmitting subsystem comprises a digital signal transmitting device and a multi-channel digital signal amplifying device.

[0049] The digital signal transmitting device comprises a display device and a multi-channel digital signal transmitting software. The multi-channel digital signal transmitting software is a visual operation software edited based on MATLAB, has a channel selection function, and can flexibly drive single-channel or multi-channel signal transmission according to operation requirements, and has flexibility and maneuverability. The visual operation software can set different or same amplitudes or phases for different channels, so as to realize beam control and other transmission operations of the multi-beam parametric transmitting transducer.

[0050] The multi-channel digital signal amplifying device is a multi-channel high-frequency broadband power amplifier, has a multi-channel and high-frequency broadband characteristic design, effectively avoids the inconsistency problem caused by using multiple power amplifiers, and effectively guarantees stable energy output. The high-frequency broadband design successfully avoids the distortion phenomenon of the transmitting signal, so that the transmitting signal is stable and real. After receiving the digital signal transmitted by the multi-beam signal transmitting subsystem, the multi-channel digital signal amplifying device drives the corresponding channel of the multi-beam parametric transmitting transducer to vibrate, and transmits a synchronous signal to the multi-beam signal receiving and collecting subsystem.

[0051] The transducer array hanging and placing control subsystem comprises a wireless control turntable system capable of vertical movement and horizontal rotation, a flange, and a transducer clamping device. The transducer clamping device is rigidly connected with the flange through a screw, and the transducer clamping device is rigidly connected with the back of the electronic warehouse body through a screw.

[0052] Specifically, the lower end of the transducer clamping device is fixed to the back of the electronic cabinet by screws, and then rigidly connected with the multi-beam parametric transducer and the multi-beam high-frequency and low-frequency receiving transducer; the upper end of the transducer clamping device is rigidly connected with the flange plate by screws; the flange plate is rigidly connected with the wireless control turntable system by screws; and the multi-beam high-frequency and low-frequency cooperative working transducer array is rigidly connected with the wireless control turntable system.

[0053] The multi-beam signal receiving and collecting subsystem comprises a multi-channel receiving device and a multi-channel collecting device.

[0054] Figure 4 The high-frequency and low-frequency cooperative working multi-beam parametric array transducer testing system working flowchart in the embodiment of the application.

[0055] As shown in Figure 4 The standard hydrophone receives the sound signals transmitted by the multi-beam parametric transducer and converts them into electric signals, and receives the high-frequency signals and the low-frequency signals at the same time. The high-frequency original frequency signals and the low-frequency difference frequency signals are obtained through the filter, and then the double-channel display is performed through the oscilloscope. The oscilloscope is externally triggered or internally triggered through the synchronization signals emitted by the multi-channel digital signal amplifying device. The multi-channel signal collecting software receives the synchronization signals emitted by the multi-channel digital signal amplifying device, and controls the wireless control turntable system to rotate or be static according to the testing requirements, and collects and displays the double-channel signals received by the oscilloscope on the display device.

[0056] In the embodiment, two filters are adopted to perform high-frequency or low-frequency filtering.

[0057] In this embodiment, the multi-beam high-frequency low-frequency receiving transducer receives the acoustic signal, which can be selected as the acoustic signal emitted or scattered by the target or obstacle after the acoustic signal conducted by the multi-beam parametric transmitting transducer is emitted, or as the acoustic signal emitted by the standard sound source. The multi-beam high-frequency low-frequency receiving transducer simultaneously receives the high-frequency signal and the low-frequency signal. The multi-beam high-frequency low-frequency receiving transducer converts the received multi-channel acoustic signal into an electric signal, and the generated electric signal passes through the multi-channel broadband receiving matching circuit for corresponding amplitude or phase compensation. The electric signal matched by the multi-channel receiving matching circuit is conducted to the multi-channel NI acquisition device through the receiving watertight multi-core cable. The multi-channel signal acquisition software receives the synchronization signal emitted by the multi-channel digital signal amplification device, synchronously controls the wireless control turntable system to rotate or be stationary according to the test requirement, simultaneously drives the multi-channel NI acquisition device to acquire the multi-channel signal, and displays the acquisition result on the display device. Alternatively, the multi-channel signal acquisition software filters the signal acquired by each channel, so that the high-frequency original frequency signal and the low-frequency difference frequency signal are simultaneously obtained by each channel.

[0058] Embodiment 2:

[0059] The embodiment provides a working method of a multi-beam parametric array transmitting and receiving transducer test system working in cooperation with high-frequency and low-frequency, which adopts the multi-beam parametric array transmitting and receiving transducer test system working in cooperation with high-frequency and low-frequency, and comprises the following steps.

[0060] Step S1: The multi-channel digital signal transmitting software emits a digital signal instruction to drive the multi-channel digital signal amplification device to work.

[0061] Step S2: After receiving the instruction, the multi-channel digital signal amplification device drives the multi-beam parametric transmitting transducer to vibrate to generate an acoustic signal through a water medium.

[0062] Step S3: The multi-channel digital signal amplification device simultaneously emits a synchronization signal and transmits the synchronization signal to the multi-beam signal receiving and acquisition subsystem.

[0063] Step S4: The multi-beam high-frequency low-frequency receiving transducer receives the acoustic signal conducted through the water medium and converts the acoustic signal into a multi-channel electric signal. Meanwhile, the multi-beam signal receiving and acquisition subsystem receives the synchronization signal emitted by the multi-channel digital signal amplification device, the multi-channel signal acquisition software controls the wireless control turntable system to rotate or be stationary, and after a time delay, the multi-channel signal receiving and acquisition is started.

[0064] The present application is not only suitable for the above-mentioned high-frequency and low-frequency cooperative multi-beam transmitting and receiving transducer array related test, but also suitable for high-frequency or low-frequency transducer acoustic performance test such as single-channel transmitting transducer, multi-channel transmitting transducer, single-channel receiving transducer, multi-channel receiving transducer, etc. Although the present application has been disclosed as above with the preferred embodiments, it is not intended to limit the present application, and any person skilled in the art can make possible changes and modifications to the technical solutions of the present application by using the disclosed methods and technical contents without departing from the spirit and scope of the present application. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, which does not depart from the technical solutions of the present application, shall fall within the protection scope of the technical solutions of the present application.

[0065] Those skilled in the art know that, in addition to implementing the system and each device, module and unit thereof provided by the present application in the form of pure computer readable program code, the system and each device, module and unit thereof provided by the present application can also be implemented in the form of logic gate, switch, application specific integrated circuit, programmable logic controller and embedded microcontroller by logically programming the method steps to achieve the same function. Therefore, the system and each device, module and unit thereof provided by the present application can be considered as a hardware component, and the devices, modules and units included therein for achieving various functions can also be considered as structures within the hardware component; the devices, modules and units for achieving various functions can also be considered as both software modules for implementing methods and structures within the hardware component.

Claims

1. A high-low frequency co-operated multi-beam parametric array transmitting-receiving transducer test system, characterized in that, The application relates to a high-frequency and low-frequency synergic multi-beam transmitting and receiving transducer array, a multi-beam signal transmitting subsystem, a transducer array hanging and placing control subsystem and a multi-beam signal receiving and collecting subsystem. The high-frequency and low-frequency synergic multi-beam transmitting and receiving transducer array comprises a multi-beam parametric transmitting transducer, a multi-beam high-frequency and low-frequency receiving transducer, an electronic bin body, a multi-channel wide-band receiving matching circuit, a transmitting water-tight multi-core cable and a receiving water-tight multi-core cable. The multi-beam signal transmitting subsystem comprises a digital signal transmitting device and a multi-channel digital signal amplifying device, the digital signal transmitting device comprises a display device and multi-channel digital signal transmitting software, the multi-channel digital signal amplifying device is a multi-channel high-frequency wide-band power amplifier, after receiving the digital signal transmitted by the multi-beam signal transmitting subsystem, the multi-channel high-frequency wide-band power amplifier drives corresponding channels of the multi-beam parametric transmitting transducer to vibrate and transmits a synchronous signal to the multi-beam signal receiving and collecting subsystem. The transducer array hanging and placing control subsystem comprises a wireless control turntable system, a flange and a transducer clamping device, the transducer clamping device is connected with the flange, and the transducer clamping device is connected with the back of the electronic bin body. The multi-beam signal receiving and collecting subsystem comprises a multi-channel receiving device and a multi-channel collecting device, the multi-channel receiving device comprises a standard hydrophone, a filter and an oscilloscope, the multi-channel collecting device comprises a multi-channel NI collecting device, multi-channel signal collecting software and a display device. The multi-beam parametric transmitting transducer and the multi-beam high-frequency and low-frequency receiving transducer are installed on the same back plate and integrated by polyurethane pouring, the radiation surfaces are located on the same horizontal plane, and the high-frequency and low-frequency synergic multi-beam transmitting and receiving transducer array which integrates transmitting and receiving high-frequency signals and low-frequency signals is formed.

2. The test system for a high-low frequency synergic multi-beam parametric array transducer according to claim 1, characterized in that, The back of the high-frequency and low-frequency synergic multi-beam transmitting and receiving transducer array is fixed with the electronic bin body through screws, the transmitting water-tight multi-core cable and the receiving water-tight multi-core cable are respectively installed on non-adjacent two sides of the electronic bin body, and the back of the electronic bin body is provided with a hole position for connecting with the transducer hanging and placing control subsystem.

3. The test system for a high-low frequency synergic multi-beam parametric array transducer according to claim 2, characterized in that, The multi-beam parametric transmitting transducer and the multi-beam high-frequency and low-frequency receiving transducer are both wide-band transducers and comprise transducing material, a matching layer and a pressure-resistant backing, the transducing material adopts piezoelectric composite material which is made by cutting and filling epoxy resin through piezoelectric ceramic, the matching layer is bonded to the radiation surface of the piezoelectric composite material, and the pressure-resistant backing is bonded to the back of the piezoelectric composite material.

4. The test system for a high-low frequency synergic multi-beam parametric array transducer according to claim 3, characterized in that, The multi-beam parametric transmitting transducer and the multi-beam high-frequency and low-frequency receiving transducer are both multi-channel linear arrays and adopt multi-channel design, carry out multi-beam working mode, realize beam rotation of not less than + / -30 degrees, and the multi-beam parametric transmitting transducer is designed to complete transmitting of original frequency bandwidth which is not limited to 85kHz-115kHz and difference frequency bandwidth which is 2kHz-20kHz.

5. The test system for a high-low frequency synergic multi-beam parametric array transducer according to claim 4, characterized in that, The multi-channel digital signal transmitting software is visual operation software edited based on MATLAB and has a channel selection function.

6. The test system for a high-low frequency synergic multi-beam parametric array transducer according to claim 1, characterized in that, ​ 7. The test system for a high-low frequency synergic multi-beam parametric array transducer according to claim 1, characterized in that, The lower end of the transducer clamping device is fixed to the back of the electronic cabinet by screws, and then rigidly connected with the multi-beam parametric transducer and the multi-beam high-frequency low-frequency receiving transducer; the upper end of the transducer clamping device is rigidly connected with the flange plate by screws; the flange plate is rigidly connected with the wireless control turntable system by screws; and then the high-frequency low-frequency cooperative multi-beam transmitting and receiving transducer array is rigidly connected with the wireless control turntable system.

8. The test system for a high-low frequency synergic multi-beam parametric array transducer according to claim 1, characterized in that, The standard hydrophone receives the acoustic signals transmitted and conducted by the multi-beam parametric transducer, and converts them into electrical signals, and high-frequency original frequency signals and low-frequency difference frequency signals are obtained through a filter respectively, and then double-channel display is performed through the oscilloscope; the multi-channel signal acquisition software receives the synchronization signals emitted by the multi-channel digital signal amplification device, and synchronously controls the wireless control turntable system to rotate or be stationary, while collecting and displaying the double-channel signals received by the oscilloscope on the display device.

9. The test system for a high-low frequency co-operated multi-beam parametric array transducer of claim 8, wherein, The multi-beam high-frequency low-frequency receiving transducer receives acoustic signals, which are acoustic signals transmitted and conducted by the multi-beam parametric transducer, emitted or scattered by the target to be measured or obstacles, or acoustic signals transmitted and conducted by a standard sound source, and the multi-beam high-frequency low-frequency receiving transducer converts the received multi-channel acoustic signals into electrical signals, and the generated electrical signals are transmitted to the multi-channel NI acquisition device through the receiving watertight multi-core cable after compensation by the multi-channel wideband receiving matching circuit.

10. A test method of a high-low frequency synergic multi-beam parametric array transmitting-receiving transducer, using the test system of any one of claims 1 to 9, characterized in that, The method comprises the following steps: Step S1, the multi-channel digital signal transmitting software emits a digital signal instruction to drive the multi-channel digital signal amplification device to work; Step S2, after receiving the instruction, the multi-channel digital signal amplification device drives the multi-beam parametric transducer to vibrate to generate acoustic signals through the water medium; Step S3, the multi-channel digital signal amplification device simultaneously emits a synchronization signal and transmits it to the multi-beam signal receiving and collecting subsystem; Step S4, the multi-beam high-frequency low-frequency receiving transducer receives the acoustic signals transmitted and conducted through the water medium and converts them into multi-channel electrical signals, and at the same time, the multi-beam signal receiving and collecting subsystem receives the synchronization signal emitted by the multi-channel digital signal amplification device, and the multi-channel signal acquisition software controls the wireless control turntable system to rotate or be stationary, and after a time delay, multi-channel signal receiving and collecting is started.

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