Ultrasonic transducer electrical impedance characteristic detection system and method

Abstract

The invention relates to the technical field of ultrasonic transducers, and provides an ultrasonic transducer electrical impedance characteristic detection system and method, and the system comprises an excitation module which is used for exciting a target ultrasonic transducer to work intermittently, and transmitting a preset detection signal to the target ultrasonic transducer during the stop time of intermittent work, the target ultrasonic transducer is excited to enter a detection stage; the signal acquisition module is used for acquiring a voltage signal and a current signal of the target ultrasonic transducer in a detection stage; and the signal processing module is used for obtaining electrical impedance characteristic parameters of the target ultrasonic transducer during working according to the voltage signal and the current signal. According to the scheme, the wide-frequency real-time electrical impedance characteristic parameters of the ultrasonic transducer in the actual working process can be obtained.

Description

Technical Field

[0001] The present application relates to the technical field of ultrasonic transducers, and in particular to a system and method for detecting electrical impedance characteristics of ultrasonic transducers. Background Art

[0002] Ultrasonic transducer is an important part of ultrasonic therapy system. Its characteristics have a great influence on ultrasonic therapy. It is necessary to determine the characteristic parameters of ultrasonic transducer for ultrasonic therapy system. Among the many characteristic parameters of ultrasonic transducer, the electrical impedance characteristic parameter is an important characteristic parameter. Measuring the electrical impedance characteristics of ultrasonic transducer can provide impedance matching data between power supply system and ultrasonic transducer to ensure that ultrasonic transducer can obtain maximum electric power. During the operation of ultrasonic transducer, the resonant frequency of ultrasonic transducer drifts due to changes in environment, medium, etc. Measuring the electrical impedance characteristic parameters of ultrasonic transducer can provide a reliable basis for frequency tracking.

[0003] At present, there are two main methods for measuring the electrical impedance characteristic parameters of ultrasonic transducers: impedance analyzer measurement method and sampling resistance method. Both of the above methods use low-amplitude continuous wave excitation signals to drive the ultrasonic transducer, and cannot be measured when the ultrasonic transducer is working. At the same time, during the actual operation of the ultrasonic transducer, it is excited by a high-amplitude electrical signal, and its electrical impedance characteristics will change significantly compared with low-amplitude electrical signal excitation.

[0004] Therefore, how to detect the electrical impedance characteristics of ultrasonic transducers in actual work is a problem that needs to be solved urgently. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of the present application is to provide an ultrasonic transducer electrical impedance characteristic detection system and method, which is used to solve the problem of how to detect the electrical impedance characteristics of the ultrasonic transducer in actual work in the prior art.

[0006] To achieve the above-mentioned purpose and other related purposes, the present application provides an ultrasonic transducer electrical impedance characteristic detection system, characterized in that the system comprises:

[0007] An excitation module, used for exciting the target ultrasonic transducer to perform intermittent work, and transmitting a preset detection signal to the target ultrasonic transducer during the stop time of the intermittent work, so as to excite the target ultrasonic transducer to enter the detection phase;

[0008] A signal acquisition module, used for acquiring a voltage signal and a current signal of the target ultrasonic transducer during the detection phase;

[0009] The signal processing module is used to obtain the electrical impedance characteristic parameters of the target ultrasonic transducer when it is working according to the voltage signal and the current signal.

[0010] In one embodiment of the present application, the preset detection signal includes a single-pulse square wave signal, and the amplitude of the single-pulse square wave signal is equal to the amplitude of the excitation signal during the treatment time of the intermittent operation.

[0011] In one embodiment of the present application, the period of the single-pulse square wave signal includes 0.5us-1.5us.

[0012] In one embodiment of the present application, the incentive module includes:

[0013] Ultrasonic power supply;

[0014] An impedance matching unit, one end of which is connected to the ultrasonic power supply, and the other end of which is connected to the target ultrasonic transducer.

[0015] In one embodiment of the present application, the signal acquisition module includes:

[0016] A voltage probe, disposed in a circuit connecting the impedance matching unit and the target ultrasonic transducer, the voltage probe being used to collect a voltage signal of the target ultrasonic transducer during the detection phase;

[0017] A current probe is arranged in a circuit connecting the impedance matching unit and the target ultrasonic transducer, and the current probe is used to collect a current signal of the target ultrasonic transducer in the detection phase.

[0018] In one embodiment of the present application, the signal processing module includes:

[0019] A first signal processing unit, configured to perform analog-to-digital conversion on the voltage signal and the current signal to obtain a voltage time-domain signal and a current time-domain signal after analog-to-digital conversion;

[0020] The second signal processing unit is used to perform Fourier transform on the voltage time domain signal and the current time domain signal to obtain frequency spectrum signals of the voltage and the current, and obtain the electrical impedance characteristic parameter according to the frequency spectrum signals.

[0021] In one embodiment of the present application, obtaining the electrical impedance characteristic parameter according to the spectrum signal includes:

[0022] According to the frequency spectrum signal, electrical impedance and phase are obtained;

[0023] The electrical impedance characteristic parameters are obtained according to the electrical impedance and the phase, and the electrical impedance characteristic parameters include resistance and reactance.

[0024] In one embodiment of the present application, a method for detecting electrical impedance characteristics of an ultrasonic transducer is also provided, the method comprising:

[0025] The excitation module excites the target ultrasonic transducer to perform intermittent work, and transmits a preset detection signal to the target ultrasonic transducer during the stop time of the intermittent work, so as to excite the target ultrasonic transducer to enter the detection phase;

[0026] The signal acquisition module acquires the voltage signal and the current signal of the target ultrasonic transducer during the detection phase;

[0027] The signal processing module obtains the electrical impedance characteristic parameters of the target ultrasonic transducer when it is working according to the voltage signal and the current signal.

[0028] In one embodiment of the present application, the preset detection signal includes a single-pulse square wave signal, and the amplitude of the single-pulse square wave signal is equal to the amplitude of the excitation signal during the treatment time of the intermittent operation.

[0029] In one embodiment of the present application, the period of the single-pulse square wave signal includes 0.5us-1.5us.

[0030] Beneficial effects of the present invention:

[0031] First, the excitation module excites the target ultrasonic transducer to work intermittently, and transmits a preset detection signal to the target ultrasonic transducer during the stop time of the intermittent work to excite the target ultrasonic transducer to enter the detection stage; then the signal acquisition module collects the voltage signal and current signal of the target ultrasonic transducer during the detection stage; finally, the signal processing module obtains the electrical impedance characteristic parameters of the target ultrasonic transducer when working according to the voltage signal and the current signal. In the present invention, by transmitting a preset detection signal to the target ultrasonic transducer during the stop time of the intermittent work, the real-time electrical impedance characteristic parameters of the ultrasonic transducer with a wide frequency in the actual working process can be obtained; real-time measurement of the electrical impedance characteristics of the ultrasonic transducer can provide impedance matching data for the power supply system and the ultrasonic transducer to ensure that the ultrasonic transducer can obtain the maximum electrical power; real-time measurement of the electrical impedance characteristics of the ultrasonic transducer can obtain the real-time resonant frequency of the ultrasonic transducer during the actual working process, providing a basis for adjusting the output frequency of the power supply system to ensure that the ultrasonic transducer works in the best state.

[0032] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0034] Figure 1 is a structural schematic diagram of an ultrasonic transducer electrical impedance characteristic detection system shown in an exemplary embodiment of the present application;

[0035] Figure 2 is a schematic diagram of an electrical signal excitation received by a target ultrasonic transducer when performing intermittent operation, shown in an exemplary embodiment of the present application;

[0036] Figure 3 is a schematic diagram showing a preset detection signal excitation received by a target ultrasonic transducer during a detection phase, shown in an exemplary embodiment of the present application;

[0037] Figure 4 is a waveform diagram of a voltage signal of a single pulse square wave signal exciting an ultrasonic transducer according to an exemplary embodiment of the present application;

[0038] Figure 5 is a waveform diagram of a current signal of an ultrasonic transducer excited by a single pulse square wave signal, shown in an exemplary embodiment of the present application;

[0039] Figure 6 is a schematic diagram showing a comparison of the real part of the electrical impedance of an ultrasonic transducer according to an exemplary embodiment of the present application;

[0040] Figure 7 is a schematic diagram showing a comparison of the imaginary part of the electrical impedance of an ultrasonic transducer according to an exemplary embodiment of the present application;

[0041] Figure 8 It is a flow chart of a method for detecting electrical impedance characteristics of an ultrasonic transducer shown in an exemplary embodiment of the present application.

[0042] Description of Figure Numbers:

[0043] 101 - ultrasonic power supply, 102 - impedance matching unit, 103 - voltage probe, 104 - current probe, 105 - target ultrasonic transducer, 106 - working medium, 107 - first signal processing unit, 108 - second signal processing unit. DETAILED DESCRIPTION

[0044] The following will describe the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention, not for limiting the scope of protection of the present invention.

[0045] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0046] In the following description, numerous details are discussed to provide a more thorough explanation of the embodiments of the present invention. However, it is obvious to those skilled in the art that the embodiments of the present invention can be implemented without these specific details. In other embodiments, well-known structures and devices are shown in the form of block diagrams rather than in detail to avoid making the embodiments of the present invention difficult to understand.

[0047] First of all, it should be noted that the methods for obtaining the electrical impedance characteristic parameters of ultrasonic transducers in the prior art mainly include the impedance analyzer measurement method and the sampling resistance method. The impedance analyzer measurement method cannot measure the impedance spectrum of the ultrasonic transducer in the working state and cannot be integrated with the transducer working circuit. The sampling resistance method mainly performs current sampling during continuous wave output, and can calculate the impedance at the working frequency, but cannot obtain impedance spectrum information (wideband); high-amplitude signals can reflect the impedance in the actual working state, and single-pulse square wave signals can reflect the impedance of the entire frequency range, but continuous waves cannot.

[0048] Therefore, in order to ensure that the ultrasonic transducer can obtain the maximum electrical power and ensure that the ultrasonic transducer works in the best state, it is necessary to obtain the electrical impedance characteristics of the ultrasonic transducer in actual work.

[0049] The following is an explanation of the technical terms in this application:

[0050] Ultrasonic transducer: a device that converts electromagnetic energy into mechanical energy (sound energy), usually made of piezoelectric ceramics or other magnetostrictive materials. Common ultrasonic cleaners, ultrasonic atomizers, B-ultrasound probes, etc. are all application examples of ultrasonic transducers.

[0051] Electrical impedance: It is a term from physics, which refers to the electrical characteristics between any two points in a circuit. In general, there is often more than one circuit element, but a complex combination of resistors, inductors, capacitors, transformers, etc. The characteristics of the combination of components in series or in parallel between any two points in the circuit can be expressed by electrical impedance.

[0052] In order to solve the problem of how to detect the electrical impedance characteristics of an ultrasonic transducer in actual work in the prior art, the embodiments of the present application respectively propose an ultrasonic transducer electrical impedance characteristics detection system and an ultrasonic transducer electrical impedance characteristics detection method, and these embodiments will be described in detail below.

[0053] In an exemplary embodiment, a system for detecting electrical impedance characteristics of an ultrasonic transducer is provided, the system comprising:

[0054] The excitation module is used to excite the target ultrasonic transducer to perform intermittent work, and transmit a preset detection signal to the target ultrasonic transducer during the stop time of the intermittent work to excite the target ultrasonic transducer to enter the detection phase.

[0055] Exemplarily, the excitation module may include an ultrasonic power supply and an impedance matching unit to excite the target ultrasonic transducer to operate.

[0056] The signal acquisition module is used to acquire the voltage signal and current signal of the target ultrasonic transducer during the detection phase.

[0057] Exemplarily, the signal acquisition module may include a voltage probe for acquiring voltage signals and a current probe for acquiring current signals.

[0058] The signal processing module is used to obtain the electrical impedance characteristic parameters of the target ultrasonic transducer when it is working according to the voltage signal and the current signal.

[0059] Exemplarily, the signal processing module may first perform analog-to-digital conversion on the voltage signal and the current signal, then perform Fourier transform on the analog-to-digital converted signals to obtain spectrum signals of the voltage and current, and finally calculate the spectrum signals to obtain electrical impedance characteristic parameters, which may be, for example, resistance and reactance.

[0060] For example, see Figure 1 , Figure 1 It is a structural schematic diagram of an ultrasonic transducer electrical impedance characteristic detection system shown in an exemplary embodiment of the present application.

[0061] like Figure 1 As shown, the electrical signal of the ultrasonic power supply 101 excites the target ultrasonic transducer 105 after passing through the impedance matching unit 102 , and the target ultrasonic transducer 105 performs intermittent work and acts on the working medium 106 .

[0062] For example, during the ultrasound treatment process, the ultrasound treatment adopts an intermittent working mode, that is, it works for a certain period of time and then stops for a certain period of time, and repeats the above intermittent work to complete the treatment. Figure 2 , Figure 2 FIG. 1 is a schematic diagram showing an exemplary embodiment of the present application showing an electrical signal excitation received by a target ultrasonic transducer when it is intermittently working. Figure 2 As shown, in an intermittent working time period, there are multiple treatment times and multiple stop times. During the treatment time, the electrical signal of the ultrasonic power supply 101 excites the target ultrasonic transducer 105 for treatment after passing through the impedance matching unit 102; during the stop time, the ultrasonic power supply 101 stops exciting the target ultrasonic transducer 105.

[0063] Exemplarily, when the electrical impedance characteristic test of the target ultrasonic transducer 105 is required, a preset test signal is transmitted to the target ultrasonic transducer 105 during the stop time of the intermittent operation to stimulate the target ultrasonic transducer 105 to enter the test phase. Figure 1 After the target ultrasonic transducer 105 enters the detection phase, the voltage signal of the target transducer 105 is collected through the voltage probe 103 on the cable, and the current signal of the target transducer 105 is collected through the current probe 104 on the cable. The first signal processing unit 107 performs analog-to-digital conversion on the voltage signal to obtain a voltage time domain signal, and performs analog-to-digital conversion on the current signal to obtain a current time domain signal; the second signal processing unit 108 performs Fourier transform on the voltage time domain signal and the current time domain signal to obtain the spectrum signals of the voltage and the current, and obtains the electrical impedance characteristic parameters of the target ultrasonic transducer 105 when working according to the spectrum signals.

[0064] From the above description of the ultrasonic transducer electrical impedance characteristic detection system, it can be seen that the scheme proposed in this embodiment can obtain the real-time electrical impedance characteristic parameters of the ultrasonic transducer with a wide frequency during the actual working process by transmitting a preset detection signal to the target ultrasonic transducer during the stop time of intermittent work; real-time measurement of the electrical impedance characteristics of the ultrasonic transducer can provide impedance matching data for the power supply system and the ultrasonic transducer to ensure that the ultrasonic transducer can obtain the maximum electric power; real-time measurement of the electrical impedance characteristics of the ultrasonic transducer can obtain the real-time resonant frequency of the ultrasonic transducer during the actual working process, providing a basis for adjusting the output frequency of the power supply system to ensure that the ultrasonic transducer works in the best state.

[0065] In one embodiment of the present application, the preset detection signal includes a single-pulse square wave signal, and the amplitude of the single-pulse square wave signal is equal to the amplitude of the excitation signal during the treatment time of the intermittent operation.

[0066] In one embodiment of the present application, the period of the single-pulse square wave signal includes 0.5us-1.5us.

[0067] Exemplarily, when the target ultrasonic transducer works intermittently, a single pulse square wave signal is transmitted to the target ultrasonic transducer during the stop time, so that the target ultrasonic transducer enters the detection phase. Figure 3 , Figure 3 FIG. 1 is a schematic diagram showing a preset detection signal excitation received by a target ultrasonic transducer during the detection phase, according to an exemplary embodiment of the present application. Figure 3 As shown, during the stop time, the single-pulse square wave signal forms a detection pulse to enable the target ultrasonic transducer to enter the detection phase.

[0068] It should be noted that the amplitude of the preset detection signal in the embodiment of the present application may not be equal to the amplitude of the excitation signal during the intermittent treatment time. The specific amplitude range is the excitation signal amplitude that the ultrasonic transducer can withstand; the period of the preset detection signal may also be other appropriate periods; the waveform of the preset detection signal may also be other types, such as sine wave, cosine wave. The single-pulse square wave signal in this application is only used as an example and is not limited to this. The amplitude, period, and waveform in the actual detection process can be selected according to actual needs.

[0069] In one embodiment of the present application, the incentive module includes:

[0070] Ultrasonic power supply;

[0071] An impedance matching unit, one end of which is connected to the ultrasonic power supply, and the other end of which is connected to the target ultrasonic transducer.

[0072] In one embodiment of the present application, the signal acquisition module includes:

[0073] A voltage probe, disposed in a circuit connecting the impedance matching unit and the target ultrasonic transducer, the voltage probe being used to collect a voltage signal of the target ultrasonic transducer during the detection phase;

[0074] A current probe is arranged in a circuit connecting the impedance matching unit and the target ultrasonic transducer, and the current probe is used to collect a current signal of the target ultrasonic transducer in the detection phase.

[0075] For example, see Figure 4 and Figure 5 , Figure 4 is a waveform diagram of a voltage signal of a single pulse square wave signal exciting an ultrasonic transducer, shown in an exemplary embodiment of the present application. Figure 5 FIG. 1 is a waveform diagram of a current signal of a single pulse square wave signal exciting an ultrasonic transducer according to an exemplary embodiment of the present application. Figure 4 and Figure 5As shown, under the excitation of the single-pulse square wave signal, the voltage signal and current signal of the target ultrasonic transducer both fluctuate at the same time point.

[0076] In one embodiment of the present application, the signal processing module includes:

[0077] A first signal processing unit, configured to perform analog-to-digital conversion on the voltage signal and the current signal to obtain a voltage time-domain signal and a current time-domain signal after analog-to-digital conversion;

[0078] The second signal processing unit is used to perform Fourier transform on the voltage time domain signal and the current time domain signal to obtain frequency spectrum signals of the voltage and the current, and obtain the electrical impedance characteristic parameter according to the frequency spectrum signals.

[0079] Exemplarily, the first signal processing unit may be, for example, an analog-to-digital conversion unit, and the second signal processing unit may be, for example, a computer.

[0080] In one embodiment of the present application, the representation of the frequency spectrum signal of the voltage includes:

[0081]

[0082] Wherein, U(ω) is the frequency spectrum signal of the voltage, u(t) is the time domain signal of the voltage, |U(ω)| is the modulus of the frequency spectrum signal of the voltage, is the voltage signal phase, ω is the angular frequency;

[0083] The representation of the current spectrum signal includes:

[0084]

[0085] Wherein, I(ω) is the frequency spectrum signal of the current, i(t) is the time domain signal of the current, |I(ω)| is the modulus of the frequency spectrum signal of the current, is the current signal phase.

[0086] In one embodiment of the present application, obtaining the electrical impedance characteristic parameter according to the spectrum signal includes:

[0087] According to the frequency spectrum signal, electrical impedance and phase are obtained;

[0088] The electrical impedance characteristic parameters are obtained according to the electrical impedance and the phase, and the electrical impedance characteristic parameters include resistance and reactance.

[0089] Exemplarily, the real part and the imaginary part of the electrical impedance can be calculated through the electrical impedance and the phase, wherein the real part is the resistance and the imaginary part is the reactance.

[0090] In one embodiment of the present application, the electrical impedance is represented by:

[0091]

[0092] Wherein, Z(ω) is the electrical impedance;

[0093] The phase representation includes:

[0094]

[0095] in, is the phase;

[0096] The resistance may be expressed as follows:

[0097]

[0098] Wherein, R is the resistance, |Z(ω)| is the modulus of the electrical impedance;

[0099] The reactance may be expressed as follows:

[0100]

[0101] Wherein, X is the reactance.

[0102] In one embodiment of the present application, the effect of the ultrasonic transducer electrical impedance characteristic detection system in the embodiment of the present application is experimentally verified. Before the experiment, a dedicated impedance analyzer is used to measure the electrical impedance characteristic parameters of the target ultrasonic transducer. The measured parameters are the real and imaginary parts of the electrical impedance of the ultrasonic transducer, and the measurement frequency range is 0.5Mhz-1.3Mhz. Figure 1 The structure diagram of the ultrasonic transducer electrical impedance characteristic detection system shown in the figure is used for the experiment. When the ultrasonic transducer is excited by a single pulse square wave signal, the voltage signal and the current signal are collected, and the electrical impedance characteristic parameters of the target ultrasonic transducer in actual operation are calculated by the signal processing module. The real and imaginary parts of the electrical impedance calculated by the signal processing module are compared with the real and imaginary parts measured by a dedicated impedance analyzer.

[0103] See also Figure 6 and Figure 7 , Figure 6 is a schematic diagram showing a comparison of the real part of the electrical impedance of an ultrasonic transducer according to an exemplary embodiment of the present application. Figure 7 FIG. 1 is a schematic diagram showing a comparison of the imaginary part of the electrical impedance of an ultrasonic transducer according to an exemplary embodiment of the present application. Figure 6 and Figure 7As shown, the impedance parameter curve trends measured by the ultrasonic transducer impedance characteristic detection system in the embodiment of the present application and the dedicated impedance analyzer are basically consistent, and the ultrasonic transducer resonant frequency and impedance size have small differences. This is because in the actual working process of the ultrasonic transducer, it is stimulated by a high-amplitude electrical signal, and its impedance characteristics will change significantly compared with low-amplitude electrical signal stimulation. Therefore, the ultrasonic transducer impedance characteristic detection system described in this patent is of great significance for measuring impedance in the actual working state of the ultrasonic transducer.

[0104] Figure 8 FIG. 1 is a flow chart of a method for detecting the electrical impedance characteristics of an ultrasonic transducer according to an exemplary embodiment of the present application. Figure 8 As shown, the exemplary ultrasonic transducer electrical impedance characteristic detection method includes the following steps:

[0105] S801, the excitation module excites the target ultrasonic transducer to perform intermittent work, and transmits a preset detection signal to the target ultrasonic transducer during the stop time of the intermittent work, so as to excite the target ultrasonic transducer to enter the detection phase;

[0106] S802, a signal acquisition module acquires a voltage signal and a current signal of the target ultrasonic transducer during the detection phase;

[0107] S803: The signal processing module obtains the electrical impedance characteristic parameters of the target ultrasonic transducer when it is working according to the voltage signal and the current signal.

[0108] In one embodiment of the present application, the preset detection signal includes a single-pulse square wave signal, and the amplitude of the single-pulse square wave signal is equal to the amplitude of the excitation signal during the treatment time of the intermittent operation.

[0109] In one embodiment of the present application, the period of the single-pulse square wave signal includes 0.5us-1.5us.

[0110] In this exemplary ultrasonic transducer electrical impedance characteristic detection method, by transmitting a preset detection signal to the target ultrasonic transducer during the stop time of intermittent operation, the real-time electrical impedance characteristic parameters of the ultrasonic transducer with a wide frequency in the actual operation process can be obtained; real-time measurement of the electrical impedance characteristics of the ultrasonic transducer can provide impedance matching data for the power supply system and the ultrasonic transducer to ensure that the ultrasonic transducer can obtain the maximum electric power; real-time measurement of the electrical impedance characteristics of the ultrasonic transducer can obtain the real-time resonant frequency of the ultrasonic transducer in the actual operation process, providing a basis for adjusting the output frequency of the power supply system to ensure that the ultrasonic transducer works in the best state.

[0111] It should be noted that the ultrasonic transducer electrical impedance characteristic detection method provided in the above embodiment and the ultrasonic transducer electrical impedance characteristic detection system provided in the above embodiment belong to the same concept, wherein the specific manner of each operation step has been described in detail in the system embodiment, and will not be repeated here. In practical applications, the ultrasonic transducer electrical impedance characteristic detection method provided in the above embodiment can allocate the above functions to different functional modules as needed, and this is not limited here.

[0112] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. An ultrasonic transducer electrical impedance characteristic detection system, characterized in that: The system comprises: An excitation module, used for exciting the target ultrasonic transducer to perform intermittent work, and transmitting a preset detection signal to the target ultrasonic transducer during the stop time of the intermittent work, so as to excite the target ultrasonic transducer to enter the detection phase; A signal acquisition module, used for acquiring a voltage signal and a current signal of the target ultrasonic transducer during the detection phase; The signal processing module is used to obtain the electrical impedance characteristic parameters of the target ultrasonic transducer when it is working according to the voltage signal and the current signal.

2. The ultrasonic transducer electrical impedance characteristic detection system according to claim 1, characterized in that: The preset detection signal includes a single-pulse square wave signal, and the amplitude of the single-pulse square wave signal is equal to the amplitude of the excitation signal during the treatment time of the intermittent operation.

3. The ultrasonic transducer electrical impedance characteristic detection system according to claim 2, characterized in that: The period of the single-pulse square wave signal is 0.5us-1.5us.

4. The ultrasonic transducer electrical impedance characteristic detection system according to claim 1, characterized in that: The incentive module comprises: Ultrasonic power supply; An impedance matching unit, one end of which is connected to the ultrasonic power supply, and the other end of which is connected to the target ultrasonic transducer.

5. The ultrasonic transducer electrical impedance characteristic detection system according to claim 4, characterized in that: The signal acquisition module comprises: A voltage probe, disposed in a circuit connecting the impedance matching unit and the target ultrasonic transducer, the voltage probe being used to collect a voltage signal of the target ultrasonic transducer during the detection phase; A current probe is arranged in a circuit connecting the impedance matching unit and the target ultrasonic transducer, and the current probe is used to collect a current signal of the target ultrasonic transducer in the detection phase.

6. The ultrasonic transducer electrical impedance characteristic detection system according to claim 1, characterized in that: The signal processing module comprises: A first signal processing unit, configured to perform analog-to-digital conversion on the voltage signal and the current signal to obtain a voltage time-domain signal and a current time-domain signal after analog-to-digital conversion; The second signal processing unit is used to perform Fourier transform on the voltage time domain signal and the current time domain signal to obtain frequency spectrum signals of the voltage and the current, and obtain the electrical impedance characteristic parameter according to the frequency spectrum signals.

7. The ultrasonic transducer electrical impedance characteristic detection system according to claim 6, characterized in that: Obtaining the electrical impedance characteristic parameter according to the frequency spectrum signal includes: According to the frequency spectrum signal, electrical impedance and phase are obtained; The electrical impedance characteristic parameters are obtained according to the electrical impedance and the phase, and the electrical impedance characteristic parameters include resistance and reactance.

8. A method for detecting electrical impedance characteristics of an ultrasonic transducer, characterized in that: The method comprises: The excitation module excites the target ultrasonic transducer to perform intermittent work, and transmits a preset detection signal to the target ultrasonic transducer during the stop time of the intermittent work, so as to excite the target ultrasonic transducer to enter the detection phase; The signal acquisition module acquires the voltage signal and the current signal of the target ultrasonic transducer during the detection phase; The signal processing module obtains the electrical impedance characteristic parameters of the target ultrasonic transducer when it is working according to the voltage signal and the current signal.

9. The method for detecting the electrical impedance characteristics of an ultrasonic transducer according to claim 8, characterized in that: The preset detection signal includes a single-pulse square wave signal, and the amplitude of the single-pulse square wave signal is equal to the amplitude of the excitation signal during the treatment time of the intermittent operation.

10. The method for detecting electrical impedance characteristics of an ultrasonic transducer according to claim 9, characterized in that: The period of the single-pulse square wave signal is 0.5us-1.5us.

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