Multi-beam parametric array transmitting and receiving transducer testing system and method

Abstract

The invention provides a high-frequency and low-frequency cooperative work multi-beam parametric array transmitting and receiving transducer testing system and method. The system comprises a high-frequency and low-frequency cooperative work multi-beam transmitting and receiving transducer array, a multi-beam signal transmitting subsystem, a transducer array lifting control subsystem and a multi-beam signal receiving and collecting subsystem. The multi-beam transmitting and receiving transducer array comprises a multi-beam parameter transmitting transducer, a multi-beam high-frequency and low-frequency receiving transducer, an electronic bin body, a multi-channel broadband receiving matching circuit, a transmitting watertight multi-core cable and a receiving watertight multi-core cable; the multi-beam signal emission subsystem comprises a digital signal emission device and a multi-channel digital signal amplification device. The multichannel digital signal transmitting device is flexible in channel selection, the multichannel digital signal amplifying device is stable and accurate in output, the parametric array and the receiving transducer are designed in a multichannel mode, the integration advantage is obvious, linkage collaborative operation of all subsystems is accurate and complete, and various performance tests can be carried out on the transducer array.

Description

Technical Field

[0001] The present invention 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 testing system and method for high-frequency and low-frequency coordinated operation. Background Art

[0002] In the field of seabed detection technology, conventional seabed stratigraphic profilers have obvious shortcomings. Their beam is wide, resulting in low radial resolution, and they are easily interfered by sea surface echoes. In addition, the wide beam causes a large difference in time delay between the direction finding echo and the forward echo, which greatly reduces the axial resolution. Due to the large acoustic absorption of the seabed strata, only low-frequency (hundreds of hertz to thousands of hertz) sound waves can penetrate to depths of tens to hundreds of meters below the seabed. Conventional linear sonars require extremely large transducer apertures to achieve narrow beams, while parametric array technology can meet related needs with its advantages of low frequency, small size, and high directivity. Its highly directional 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) scattered sound fields of underwater targets, which is suitable for underwater AUV and ROV platforms. Detection of sinking and buried targets and other operations.

[0003] When developing 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 efficiency of the parametric array in generating difference frequency signals is extremely low, and a higher sound source level of the original frequency signal is required to improve the nonlinear conversion rate, which requires high-power transmission. At present, most parametric array transducer acoustic performance tests are single-channel signal tests. When faced with high-power multi-beam parametric array transducer tests, it is difficult to meet the test and use requirements, and there is a lack of systematic and organized multi-beam parametric array transducer performance testing methods and systems. For high-frequency broadband parametric array transducers, in order to prevent distortion of the transmitted signal, the driving power amplifier needs to be broadband designed. 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 emitted by the parametric array transducer contains high-frequency original frequency signals and difference frequency low-frequency signals. Since the total energy of the difference frequency wave increases with the increase of propagation distance (after deducting the absorption effect), the sound source level measured in the near field is lower than the far-field measurement value. Therefore, accurate measurement of the parametric array sound source level requires a sufficient distance from the sound source, which requires a larger test site and leads to high testing costs. Therefore, it is extremely critical to synchronously acquire and display the acoustic performance of high-frequency and low-frequency signals during the test signal acquisition process and provide real-time feedback to the test personnel.

[0004] In addition, most of the current parametric array transducers are only transmitting transducer devices. If they are to be tested, it is necessary to make a receiving transducer separately or use a standard hydrophone. Making a receiving transducer separately will make the system equipment complicated, increase the complexity and uncertainty of installation during testing; if the transmitting and receiving transducers are designed as an integrated system, the single circuit system will make it difficult to eliminate the electrical leakage signal, resulting in an extremely low receiving signal-to-noise ratio, reducing the detection precision and accuracy. The use of standard hydrophones also has the problem of many devices and complex installation. Moreover, standard hydrophones have a single receiving channel and cannot perform multi-channel detection, making it difficult to obtain comprehensive sound field information. If the number of hydrophones is increased, the cost will increase significantly, and the impact of the array on the receiving sound field must also be considered, further increasing the complexity of detection.

[0005] Through searching patent documents, it is found that the invention patent with acceptance number CN202110664115 discloses an in-situ shallow profiling system based on parametric array. The patent focuses on protecting its combined transmitting and receiving circuit. In this system, the transmitting and receiving share the same transducer. Through the transmitting and receiving circuits, the receiving signal is easily interfered by the transmitting circuit and the signal, with large noise and low signal-to-noise ratio. The invention patent with acceptance number CN202211209919 discloses a parametric array sound source device, system and control method. This patent mainly protects the parametric array transmitting system, which only has the transmitting function. Receiving the parametric array signal requires an additional receiving transducer and receiving circuit. The test system in Nie Xinhua's master's thesis "Research on Acoustic Parametric Array and Its Testing Technology" in 2009 is a dual-channel transmitting parametric transducer, which cannot transmit multi-beams and high-power, and has low conversion efficiency of difference frequency signals. The receiving transducer is a capacitive sensor with a low receiving frequency, which can only receive low-frequency sound signals, and the test system and transducer are limited to use in the air.

[0006] In summary, in view of the above-mentioned problems of the prior art, studying a multi-beam parametric array transmitting and receiving transducer testing system and method in which high-frequency and low-frequency coordinated work is a key task that needs to be solved urgently. Summary of the invention

[0007] In view of the defects in the prior art, the object of the present invention is to provide a multi-beam parametric array transmitting and receiving transducer testing system and method in which high frequency and low frequency work in coordination.

[0008] A high-frequency and low-frequency coordinated multi-beam parametric array transmitting and receiving transducer test system provided by the present invention comprises: a high-frequency and low-frequency coordinated 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;

[0009] The multi-beam transmitting and receiving transducer array working in coordination with high frequency and low frequency includes a multi-beam parametric transmitting transducer, a multi-beam high frequency and low frequency receiving transducer, an electronic chamber, 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 includes a digital signal transmitting device and a multi-channel digital signal amplifying device. The digital signal transmitting device includes a display device and multi-channel digital signal transmitting software. The multi-channel digital signal amplifying device is a multi-channel high-frequency broadband power amplifier. After receiving the digital signal sent by the multi-beam signal transmitting subsystem, the corresponding channel of the multi-beam parameter transmitting transducer is driven to vibrate, and a synchronization signal is sent out to the multi-beam signal receiving and collecting subsystem.

[0011] The transducer array suspension control subsystem includes a wireless control turntable system, a flange and a transducer clamping device, the transducer clamping device is connected to the flange, and the transducer clamping device is connected to the back of the electronic warehouse body;

[0012] The multi-beam signal receiving and collecting subsystem includes a multi-channel receiving device and a multi-channel collecting device. The multi-channel receiving device includes a standard hydrophone, a filter and an oscilloscope; the multi-channel collecting device includes 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 installed on the same back panel, integrated into one by polyurethane encapsulation, and the radiating surfaces are located on the same horizontal plane, forming a high-frequency and low-frequency collaborative multi-beam transmitting and receiving transducer array that transmits and receives high-frequency signals and low-frequency signals.

[0014] Preferably, the back of the multi-beam transmitting and receiving transducer array that works in coordination with high and low frequencies is fixed to the electronic warehouse body by screws; the transmitting watertight multi-core cable and the receiving watertight multi-core cable are respectively installed on the non-adjacent sides of the electronic warehouse body, and holes are provided on the back of the electronic warehouse body for connecting with the transducer hanging control subsystem.

[0015] Preferably, the multi-beam parametric transmitting transducer and the multi-beam high-frequency and low-frequency receiving transducer are both broadband transducers, and both include a transducing material, a matching layer and a pressure-resistant backing. The transducing material is made of a piezoelectric composite material, which is made by cutting piezoelectric ceramics and filling them with 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.

[0016] Preferably, the multi-beam parametric transmitting transducer and the multi-beam high-frequency and low-frequency receiving transducer are both multi-channel linear arrays, and both adopt a multi-channel design to perform a multi-beam working mode to achieve a beam rotation of not less than ±30°. The transmitting original frequency bandwidth designed by the multi-beam parametric transmitting transducer is not limited to 85kHz-115kHz, and the difference frequency bandwidth is 2kHz-20kHz.

[0017] Preferably, the multi-channel digital signal transmission software is a 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 compartment body by screws, and thus is rigidly connected to the multi-beam parametric transmitting transducer and the multi-beam high-frequency and low-frequency receiving transducer; the upper end of the transducer clamping device is rigidly connected to the flange by screws; the flange is rigidly connected to the wireless control turntable system by screws; and thus the multi-beam transmitting and receiving transducer array working in coordination with high frequency and low frequency is rigidly connected to the wireless control turntable system.

[0019] Preferably, the standard hydrophone receives the acoustic signal transmitted by the multi-beam parametric transmitting transducer and converts it into an electrical signal, obtains the high-frequency original frequency signal and the low-frequency difference frequency signal through a filter, and then displays the dual-channel through an oscilloscope. The multi-channel signal acquisition software receives the synchronization signal emitted by the multi-channel digital signal amplification device, and synchronously controls the wireless control turntable system to rotate or stay still, and at the same time acquires and displays the dual-channel signal received by the oscilloscope on the display device.

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

[0021] The present invention also provides a method for testing a multi-beam parametric array transmitting and receiving transducer with high frequency and low frequency working in coordination, which adopts the above-mentioned multi-beam parametric array transmitting and receiving transducer testing system with high frequency and low frequency working in coordination, and comprises the following steps:

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

[0023] Step S2, after receiving the instruction, the multi-channel digital signal amplifier drives the multi-beam parametric transmitting transducer to vibrate and generate an acoustic signal through the water medium;

[0024] Step S3, the multi-channel digital signal amplifying device simultaneously sends out a synchronization signal and transmits it to the multi-beam signal receiving and collecting subsystem;

[0025] Step S4, the multi-beam high-frequency and low-frequency receiving transducer receives the acoustic signal transmitted through the water medium and converts it into a multi-channel electrical signal. At the same time, the multi-beam signal receiving and collecting subsystem receives the synchronization signal emitted by the multi-channel digital signal amplifying device. The multi-channel signal collecting software controls the wireless control turntable system to rotate or stop, and starts the multi-channel signal receiving and collecting after a delay.

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

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

[0028] 2. The multi-channel digital signal amplifying device adopted in the present invention is a multi-channel high-frequency broadband power amplifier. The multi-channel characteristics effectively avoid the inconsistency problem of using multiple power amplifiers in conjunction, and ensure stable energy output; the high-frequency broadband design effectively prevents the distortion of the transmitted signal, ensures that the transmitted signal is stable and accurate, and highly restores the real signal.

[0029] 3. The parametric array transmitting transducer and high-frequency and low-frequency receiving transducer used in the present invention 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 transmitting transducer and the multi-beam high-frequency and low-frequency receiving transducer are integrated in design, which can not only transmit high-frequency original frequency broadband signals and synchronously generate low-frequency difference frequency signals, but also receive high-frequency and low-frequency signals at the same time, and has the advantages of easy installation and compact size. The integrated multi-beam high-frequency and low-frequency receiving transducer can efficiently receive high-frequency and low-frequency signals, and has an excellent signal-to-noise ratio. Compared with a single parametric array transceiver transducer, the separate design of the multi-beam parametric transmitting transducer and the multi-beam high-frequency and low-frequency receiving transducer effectively eliminates the electrical noise interference caused by the circuit combination.

[0030] 4. The multi-beam signal receiving and collecting subsystem, multi-channel digital signal amplifying device and wireless control turntable system adopted in the present invention realize linkage and collaborative operation through synchronization signals, effectively ensuring the accuracy and integrity of signal collection, and completely avoiding the occurrence of wrong collection and missed collection.

[0031] 5. The present invention performs a variety of performance tests on a multi-beam transmitting and receiving transducer array that works in coordination with high frequency and low frequency, including but not limited to a single-channel or multi-channel high-frequency original frequency transmission natural directivity test of a parametric array transmitting transducer, a single-channel or multi-channel difference frequency low-frequency natural directivity test, a high-frequency original frequency and difference frequency low-frequency directivity test after beam control, a single-channel or multi-channel transmission voltage response test, a single-channel or multi-channel maximum sound source level test, a single-channel or multi-channel high-frequency natural directivity test of a high-frequency and low-frequency receiving transducer, a single-channel or multi-channel low-frequency natural directivity test, a high-frequency and low-frequency directivity test after beam control, and a single-channel or multi-channel receiving sensitivity test. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0033] Figure 1 A diagram of a test system for a multi-beam parametric array transmitting and receiving transducer with high frequency and low frequency working in coordination in an embodiment of the present invention;

[0034] Figure 2 A multi-beam transmitting and receiving transducer array with high frequency and low frequency working in coordination in an embodiment of the present invention;

[0035] Figure 3 This is a structural diagram of a multi-beam parametric array transmitting and receiving transducer with high frequency and low frequency working in coordination in an embodiment of the present invention;

[0036] Figure 4 This is a working flow chart of a multi-beam parametric array transmitting and receiving transducer testing system with high-frequency and low-frequency coordinated operation in an embodiment of the present invention. DETAILED DESCRIPTION

[0037] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0038] Embodiment 1:

[0039] Figure 1 This is a diagram of a test system for a multi-beam parametric array transmitting and receiving transducer with high frequency and low frequency working in coordination in an embodiment of the present invention.

[0040] like Figure 1As shown, this embodiment provides a multi-beam parametric array transmitting and receiving transducer testing system with high frequency and low frequency coordinated operation, including a multi-beam transmitting and receiving transducer array with high frequency and low frequency coordinated operation, a multi-beam signal transmitting subsystem, a transducer array suspension control subsystem and a multi-beam signal receiving and collecting subsystem.

[0041] The multi-beam transmitting and receiving transducer array working in coordination with high frequency and low frequency includes a multi-beam parametric transmitting transducer, a multi-beam high frequency and low frequency receiving transducer, an electronic chamber, a multi-channel broadband receiving matching circuit, a transmitting watertight multi-core cable and a receiving watertight multi-core cable.

[0042] Figure 2 It is a multi-beam transmitting and receiving transducer array in which high frequency and low frequency work in coordination in the embodiment of the present invention.

[0043] like Figure 2 As shown, the multi-beam parametric transmitting transducer and the multi-beam high-frequency and low-frequency receiving transducer are installed on the same back panel, integrated into one body through polyurethane encapsulation, and the radiation surface is located on the same horizontal plane, forming a high-frequency and low-frequency collaborative multi-beam transmitting and receiving transducer array that transmits and receives high-frequency signals and low-frequency signals.

[0044] Figure 3 This is a structural diagram of a multi-beam parametric array transmitting and receiving transducer that works in coordination with high and low frequencies in an embodiment of the present invention.

[0045] like Figure 3 As shown, the back of the multi-beam transmitting and receiving transducer array working in coordination with high and low frequencies is fixed to the electronic warehouse body by screws; the transmitting watertight multi-core cable and the receiving watertight multi-core cable are installed on the non-adjacent sides of the electronic warehouse body respectively, which is convenient for installation and avoids entanglement with each other, and is conducive to later test and installation. A hole is set on the back of the electronic warehouse body for connecting with the transducer hanging control subsystem.

[0046] Both the multi-beam parametric transmitting transducer and the multi-beam high-frequency and low-frequency receiving transducer are broadband transducers, and both include transducer materials, matching layers, and pressure-resistant backings. The transducer material is made of piezoelectric composite materials, which are made by cutting piezoelectric ceramics and filling them with epoxy resin; 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.

[0047] Both the multi-beam parametric transmitting transducer and the multi-beam high-frequency and low-frequency receiving transducer are multi-channel linear arrays, and both adopt a multi-channel design to perform a multi-beam working mode, capable of achieving a beam rotation of not less than ±30°. The multi-beam parametric transmitting transducer and the multi-beam high-frequency and low-frequency receiving transducer are integrated in design, simple to install, and small in size. The multi-beam high-frequency and low-frequency receiving transducer in the integrated body can effectively receive high-frequency signals and low-frequency signals at the same time, and has a high signal-to-noise ratio. The original frequency bandwidth of the multi-beam parametric transmitting transducer can be selected but not limited to 85kHz-115kHz, and its difference frequency bandwidth is 2kHz-20kHz. Compared with a single parametric array transceiver transducer, the embodiment of the present invention performs a design scheme in which the multi-beam parametric transmitting transducer and the multi-beam high-frequency and low-frequency receiving transducer are separated, which can avoid electrical noise caused by the circuit combination.

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

[0049] The digital signal transmitting device includes a display device and multi-channel digital signal transmitting software. The multi-channel digital signal transmitting software is a visual operation software edited based on MATLAB. It has a channel selection function and can flexibly drive single-channel or even multi-channel signal transmission according to operational requirements. It has flexibility and maneuverability; and 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 amplifier is a multi-channel high-frequency broadband power amplifier with multi-channel and high-frequency broadband design characteristics; the multi-channel design effectively avoids the inconsistency problem caused by the use of multiple power amplifiers, and effectively guarantees the stable output of energy; the high-frequency broadband design successfully avoids the distortion of the transmission signal, making the transmission signal stable and true. After receiving the digital signal sent by the multi-beam signal transmission subsystem, the multi-channel digital signal amplifier drives the corresponding channel of the multi-beam parametric transmission transducer to vibrate, and sends out a synchronization signal to the multi-beam signal receiving and acquisition subsystem.

[0051] The transducer array suspension control subsystem includes a wireless control turntable system that can move vertically and rotate horizontally, a flange and a transducer clamping device. The transducer clamping device is rigidly connected to the flange by screws, and the transducer clamping device is rigidly connected to the back of the electronic compartment by screws.

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

[0053] The multi-beam signal receiving and collecting subsystem includes a multi-channel receiving device and a multi-channel collecting device. The multi-channel receiving device includes a standard hydrophone, a filter and an oscilloscope; the multi-channel collecting device includes a multi-channel NI collecting device, multi-channel signal collecting software and a display device.

[0054] Figure 4 This is a working flow chart of a multi-beam parametric array transmitting and receiving transducer testing system with high-frequency and low-frequency coordinated operation in an embodiment of the present invention.

[0055] like Figure 4 As shown, the standard hydrophone receives the acoustic signal transmitted by the multi-beam parametric transmitting transducer and converts it into an electrical signal, and receives high-frequency and low-frequency signals at the same time. The high-frequency original frequency signal and the low-frequency difference frequency signal are obtained through filters respectively, and then displayed in dual channels through an oscilloscope. Among them, the oscilloscope performs external triggering or internal triggering settings through the synchronization signal emitted by the multi-channel digital signal amplifier. The multi-channel signal acquisition software receives the synchronization signal emitted by the multi-channel digital signal amplifier, and synchronously controls the wireless control turntable system to rotate or stop according to the test requirements, and simultaneously acquires and displays the dual-channel signal received by the oscilloscope on the display device.

[0056] In this embodiment, two filters are used to perform high-frequency filtering or low-frequency filtering respectively.

[0057] In this embodiment, the multi-beam high-frequency and low-frequency receiving transducer receives an acoustic signal, which can be selected as an acoustic signal transmitted or scattered by a target or obstacle to be measured by a multi-beam parametric transmitting transducer, or an acoustic signal transmitted by a standard sound source. The multi-beam high-frequency and low-frequency receiving transducer receives high-frequency and low-frequency signals at the same time. The multi-beam high-frequency and low-frequency receiving transducer converts the received multi-channel acoustic signal into an electrical signal, and the generated electrical signal passes through a multi-channel broadband receiving matching circuit to perform corresponding amplitude or phase compensation. The electrical signal matched by the multi-channel receiving matching circuit is transmitted to the multi-channel NI acquisition device through a receiving watertight multi-core cable. The multi-channel signal acquisition software receives the synchronization signal emitted by the multi-channel digital signal amplification device, and according to the test requirements, synchronously controls the wireless control turntable system to rotate or stop, and drives the acquisition multi-channel NI acquisition device to perform multi-channel signal acquisition, and displays the acquisition results on the display device. Optionally, the multi-channel signal acquisition software filters the signal collected by each channel so that each channel simultaneously obtains a high-frequency original frequency signal and a low-frequency difference frequency signal.

[0058] Embodiment 2:

[0059] This embodiment provides a working method of a multi-beam parametric array transmitting and receiving transducer testing system with high frequency and low frequency working in coordination, which adopts the above-mentioned multi-beam parametric array transmitting and receiving transducer testing system with high frequency and low frequency working in coordination, and includes the following steps:

[0060] Step S1, the multi-channel digital signal transmitting software sends a digital signal instruction to drive the multi-channel digital signal amplifying device to work.

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

[0062] Step S3: The multi-channel digital signal amplifying device simultaneously sends out a synchronization signal and transmits it to the multi-beam signal receiving and collecting subsystem.

[0063] Step S4, the multi-beam high-frequency and low-frequency receiving transducer receives the acoustic signal transmitted through the water medium and converts it into a multi-channel electrical signal. At the same time, the multi-beam signal receiving and collecting subsystem receives the synchronization signal emitted by the multi-channel digital signal amplifying device. The multi-channel signal collecting software controls the wireless control turntable system to rotate or stop, and starts the multi-channel signal receiving and collecting after a delay.

[0064] The present invention is not only applicable to the related tests of the multi-beam transmitting and receiving transducer arrays working in coordination with high frequency and low frequency, but also applicable to the acoustic performance tests of high frequency or low frequency transducers such as single channel transmitting transducers, multi-channel transmitting transducers, single channel receiving transducers, and multi-channel receiving transducers. Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are within the protection scope of the technical solution of the present invention.

[0065] Those skilled in the art know that, in addition to realizing the system and its various devices, modules, and units provided by the present invention in a purely computer-readable program code, the system and its various devices, modules, and units provided by the present invention can be completely realized in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, and embedded microcontrollers by logically programming the method steps to realize the same functions. Therefore, the system and its various devices, modules, and units provided by the present invention can be considered as a hardware component, and the devices, modules, and units included therein for realizing various functions can also be regarded as structures within the hardware component; the devices, modules, and units for realizing various functions can also be regarded as both software modules for realizing the method and structures within the hardware component.

Claims

1. A multi-beam parametric array transmitting and receiving transducer testing system with high-frequency and low-frequency coordinated operation, characterized in that: include: A multi-beam transmitting and receiving transducer array that works in coordination with high and low frequencies, a multi-beam signal transmitting subsystem, a transducer array suspension control subsystem, and a multi-beam signal receiving and collecting subsystem; The multi-beam transmitting and receiving transducer array working in coordination with high frequency and low frequency includes a multi-beam parametric transmitting transducer, a multi-beam high frequency and low frequency receiving transducer, an electronic chamber, a multi-channel broadband receiving matching circuit, a transmitting watertight multi-core cable and a receiving watertight multi-core cable; The multi-beam signal transmitting subsystem includes a digital signal transmitting device and a multi-channel digital signal amplifying device. The digital signal transmitting device includes a display device and multi-channel digital signal transmitting software. The multi-channel digital signal amplifying device is a multi-channel high-frequency broadband power amplifier. After receiving the digital signal transmitted by the multi-beam signal transmitting subsystem, the corresponding channel of the multi-beam parameter transmitting transducer is driven to vibrate, and a synchronization signal is sent out to the multi-beam signal receiving and collecting subsystem. The transducer array suspension control subsystem includes a wireless control turntable system, a flange and a transducer clamping device, wherein the transducer clamping device is connected to the flange, and the transducer clamping device is connected to the back of the electronic warehouse body; The multi-beam signal receiving and collecting subsystem includes a multi-channel receiving device and a multi-channel collecting device. The multi-channel receiving device includes a standard hydrophone, a filter and an oscilloscope; the multi-channel collecting device includes a multi-channel NI collecting device, multi-channel signal collecting software and a display device.

2. According to the high-frequency and low-frequency collaborative multi-beam parametric array transmitting and receiving transducer testing system of claim 1, it is characterized in that: The multi-beam parametric transmitting transducer and the multi-beam high-frequency and low-frequency receiving transducer are installed on the same back panel, integrated into one body through polyurethane encapsulation, and the radiation surface is located on the same horizontal plane, forming a high-frequency and low-frequency collaborative multi-beam transmitting and receiving transducer array that transmits and receives high-frequency signals and low-frequency signals.

3. The high-frequency and low-frequency collaborative multi-beam parametric array transmitting and receiving transducer testing system according to claim 2 is characterized in that: The back of the multi-beam transmitting and receiving transducer array that works in coordination with high and low frequencies is fixed to the electronic warehouse body by screws; the transmitting watertight multi-core cable and the receiving watertight multi-core cable are respectively installed on non-adjacent sides of the electronic warehouse body, and holes are provided on the back of the electronic warehouse body for connecting with the transducer hanging control subsystem.

4. The high-frequency and low-frequency coordinated multi-beam parametric array transmitting and receiving transducer testing system according to claim 3 is characterized in that: The multi-beam parametric transmitting transducer and the multi-beam high-frequency and low-frequency receiving transducer are both broadband transducers, and both include a transducing material, a matching layer and a pressure-resistant backing. The transducing material is made of a piezoelectric composite material, and the piezoelectric composite material is made by cutting piezoelectric ceramics and filling them with epoxy resin; 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.

5. The high-frequency and low-frequency coordinated multi-beam parametric array transmitting and receiving transducer testing system according to claim 4 is 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 both adopt a multi-channel design to perform a multi-beam working mode to achieve a beam rotation of not less than ±30°. The transmission original frequency bandwidth designed by the multi-beam parametric transmitting transducer is not limited to 85kHz-115kHz, and the difference frequency bandwidth is 2kHz-20kHz.

6. The high-frequency and low-frequency coordinated multi-beam parametric array transmitting and receiving transducer testing system according to claim 1, characterized in that: The multi-channel digital signal transmission software is a visual operation software edited based on MATLAB and has a channel selection function.

7. The high-frequency and low-frequency coordinated multi-beam parametric array transmitting and receiving transducer testing system according to claim 1, characterized in that: The lower end of the transducer clamping device is fixed to the back of the electronic warehouse body by screws, and thus is rigidly connected to the multi-beam parametric transmitting transducer and the multi-beam high-frequency and low-frequency receiving transducer; the upper end of the transducer clamping device is rigidly connected to the flange by screws; the flange is rigidly connected to the wireless control turntable system by screws; and thus the multi-beam transmitting and receiving transducer array working in coordination with high frequency and low frequency is rigidly connected to the wireless control turntable system.

8. The high-frequency and low-frequency coordinated multi-beam parametric array transmitting and receiving transducer testing system according to claim 1 is characterized in that: The standard hydrophone receives the acoustic signal transmitted by the multi-beam parametric transmitting transducer and converts it into an electrical signal, obtains a high-frequency original frequency signal and a low-frequency difference frequency signal through filters, and then displays them in dual channels through the oscilloscope. The multi-channel signal acquisition software receives the synchronization signal emitted by the multi-channel digital signal amplification device, and synchronously controls the wireless control turntable system to rotate or stay still, and simultaneously acquires and displays the dual-channel signal received by the oscilloscope on the display device.

9. The high-frequency and low-frequency coordinated multi-beam parametric array transmitting and receiving transducer testing system according to claim 8, characterized in that: The multi-beam high-frequency and low-frequency receiving transducer receives an acoustic signal, wherein the acoustic signal is an acoustic signal transmitted and conducted by the multi-beam parametric transmitting transducer and transmitted or scattered by a target or obstacle to be measured, or an acoustic signal transmitted and conducted by a standard sound source. The multi-beam high-frequency and low-frequency receiving transducer converts the received multi-channel acoustic signal into an electrical signal, and the generated electrical signal is compensated by a multi-channel broadband receiving matching circuit and then transmitted to the multi-channel NI acquisition device through the receiving watertight multi-core cable.

10. A method for testing a multi-beam parametric array transmitting and receiving transducer with high frequency and low frequency working in coordination, using a multi-beam parametric array transmitting and receiving transducer testing system with high frequency and low frequency working in coordination as claimed in any one of claims 1 to 9, characterized in that: The steps include: Step S1, the multi-channel digital signal transmitting software sends a digital signal instruction to drive the multi-channel digital signal amplifying device to work; Step S2, after receiving the instruction, the multi-channel digital signal amplifying device drives the multi-beam parametric transmitting transducer to vibrate and generate an acoustic signal through the water medium; Step S3, the multi-channel digital signal amplifying device simultaneously sends out a synchronization signal and transmits it to the multi-beam signal receiving and collecting subsystem; Step S4, the multi-beam high-frequency and low-frequency receiving transducer receives the acoustic signal transmitted through the water medium and converts it into a multi-channel electrical signal. At the same time, the multi-beam signal receiving and collecting subsystem receives the synchronization signal emitted by the multi-channel digital signal amplifying device. The multi-channel signal collection software controls the wireless control turntable system to rotate or stop, and starts the multi-channel signal receiving and collecting after a delay.

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