CN117949733A - Ultrasonic transducer on-line monitoring method and system based on impedance analysis - Google Patents
Ultrasonic transducer on-line monitoring method and system based on impedance analysis Download PDFInfo
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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Abstract
The invention belongs to the technical field of ultrasonic transducer monitoring, and particularly relates to an ultrasonic transducer on-line monitoring method and system based on impedance analysis, wherein the method comprises the following steps: s10, switching an ultrasonic transducer from a welding mode to an impedance mode; s20, setting sweep frequency parameters of a monitoring test according to the working frequency of the ultrasonic transducer, and monitoring the transducer; s30, processing the monitoring test original data to obtain main characteristics representing monitoring parameters; s40, comparing the obtained main characteristics with standard library characteristics to evaluate the quality characteristics of the transducer; according to the invention, through online testing of impedance parameters of the ultrasonic transducer, various parameters related to the mechanical efficiency and electroacoustic conversion efficiency of the characterization transducer are acquired, redundant information is removed from monitoring data, a transducer characteristic control model is established, and the quality and precision of an evaluation model are improved by removing redundant information in a test result, so that real-time online transducer quality evaluation is realized.
Description
Technical Field
The invention belongs to the technical field of ultrasonic transducer monitoring, and particularly relates to an ultrasonic transducer on-line monitoring method and system based on impedance analysis.
Background
The characteristics of the ultrasonic transducer are important criteria for measuring actual application of the transducer, so that the ultrasonic transducer can reach the best working state as far as possible, the energy conversion efficiency is improved, the heating is reduced, the service life is prolonged, impedance characteristic and frequency characteristic measurement are required before the transducer is used, and the design of a matching circuit of the transducer and the efficient operation of an ultrasonic system are guided; meanwhile, the transducer is one of the most vulnerable parts in the ultrasonic system, and in the working process, the impedance characteristic and the optimal working frequency of the transducer can be changed due to the influence of the frequent high-power output of the generator, the external uncertain electromagnetic and load interference and human factors, so that the signal transmission characteristic of the transducer is influenced, the quality of products is further influenced, and even the whole ultrasonic system is irreversibly influenced. On-line condition monitoring of the transducer during production is a non-negligible link in quality control.
In the prior art, the transducer parameters are measured through an impedance analyzer, and at least the following technical problems exist: on one hand, the transducer is connected to the measuring end of the impedance analyzer, the internal signal generating circuit of the impedance analyzer generates signals, the signals are output to the transducer after being conditioned, meanwhile, the sweep output result of the transducer is collected, the impedance and resonance parameters in static and off-line states are calculated, and the dynamic parameter change of the transducer in the working state cannot be monitored in real time; on the other hand, the change of impedance characteristics such as resonant frequency in the degradation process of the transducer cannot be guided in real time due to the influence of the connection state of electroacoustic media in the transducer and nonlinear interference effect on the characteristics of the transducer during off-line test.
For example, patent document CN106872782a discloses a method and a device for measuring acoustic-electric closed loop impedance of an ultrasonic transducer, which adopts two ultrasonic transducers, wherein one of the two ultrasonic transducers is used as a measurement transmitting module, the other ultrasonic transducer is used as a measurement receiving module, and a transmitting end and a receiving end are immersed in a medium. But cannot adapt to the transducer testing requirements in the production process due to the testing conditions of the medium. As another example, patent document CN109596891a discloses an on-line impedance measurement and dynamic matching system for an ultrasonic transducer, which adds an on-line impedance measurement and impedance information output function module on the basis of impedance matching, adopts a voltage probe and a current probe to collect the voltage and current connected by a connecting line between a generator and the transducer, and calculates the impedance phase and amplitude information through frequency domain information. But the purpose is more to design an impedance matching circuit, and parameters characterizing quality, such as quality factor, of the transducer itself cannot be accurately measured.
In view of this, there is a need for improvements to the deficiencies of the prior art to overcome the deficiencies in practical use.
Disclosure of Invention
In view of the foregoing drawbacks and deficiencies of the prior art, it is an object of the present invention to at least solve one or more of the above-mentioned problems of the prior art, in other words, to provide an impedance analysis based on-line monitoring method and system for an ultrasonic transducer that meets one or more of the above-mentioned needs.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
The invention provides an ultrasonic transducer on-line monitoring method based on impedance analysis, which comprises the following steps:
S10, switching an ultrasonic transducer from a welding mode to an impedance mode;
s20, setting sweep frequency parameters of a monitoring test according to the working frequency of the ultrasonic transducer, and monitoring the transducer;
s30, processing the monitoring test original data to obtain main characteristics representing monitoring parameters;
and S40, comparing the obtained main characteristics with standard library characteristics to evaluate the quality characteristics of the transducer.
Preferably, the step S10 includes:
the time to switch from the welding mode to the impedance mode is less than 100ms;
the welding mode is a first connection state of the ultrasonic transducer, and the impedance mode is a second connection state of the ultrasonic transducer.
Preferably, the step S20 includes:
S21, determining a sweep frequency range and the number of sweep frequency points according to the resonant frequency and the anti-resonant frequency of the ultrasonic transducer;
S22, establishing an equivalent circuit model of the ultrasonic transducer, and obtaining admittance and impedance of any frequency point by carrying out sweep frequency test on the ultrasonic transducer;
S23, calculating test original parameters according to admittance and impedance of each frequency point to obtain an admittance circle test curve and an impedance amplitude phase curve.
Preferably, the step S30 includes:
S31, carrying out space transformation on the data of the test original parameters to obtain high-dimensional space data;
S32, establishing a feature extraction model, and carrying out feature vector analysis on data in a high-dimensional space;
s33, solving the feature extraction model to obtain main features representing the monitoring parameters.
Preferably, the number of main features is selected according to the contribution rate.
Preferably, the step S40 includes:
S41, defining standard library characteristics of an ultrasonic transducer;
s42, calculating the upper and lower boundaries of the standard library features;
s43, comparing the boundary curve of the standard library characteristics with the main characteristics of the ultrasonic transducer obtained by the current test to judge whether the ultrasonic transducer is normal or not.
Preferably, the step S41 includes:
the main characteristics of the obtained characterization monitoring parameters are formed into a standard library by carrying out multiple tests on the ultrasonic transducers delivered from the factory; wherein the number of tests is not less than 50.
The invention also provides an ultrasonic transducer on-line monitoring system based on impedance analysis, which comprises an upper computer, an impedance testing module, an ultrasonic generator and an ultrasonic triplet, wherein the upper computer is connected with the impedance testing module and the ultrasonic generator, and the impedance testing module is connected with the ultrasonic triplet and the ultrasonic generator.
Preferably, the impedance testing module comprises a testing module and a mode switching module;
The mode switching module is connected with the ultrasonic generator and the ultrasonic triple set to form a first connection state; the mode switching module is connected with the testing module and the ultrasonic triple set to form a second connection state.
The invention also provides a computer readable medium storing computer program code which, when executed by a processor, implements a method as set forth in the above schemes.
Compared with the prior art, the invention has the beneficial effects that:
According to the impedance analysis-based ultrasonic transducer online monitoring method, various parameters representing the mechanical efficiency and electroacoustic conversion efficiency of the transducer are acquired through online testing of impedance parameters of the ultrasonic transducer, a transducer characteristic management and control model is built through removing redundant information from monitoring data, quality and accuracy of an evaluation model are improved through removing redundant information from testing results, and real-time online transducer quality evaluation is achieved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other embodiments of the drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of an on-line monitoring method according to an embodiment of the application;
FIG. 2 is a timing diagram of a test switch according to an embodiment of the present application;
FIG. 3 is an equivalent circuit diagram of an embodiment of the present application;
FIG. 4 is an admittance circle of an embodiment of the present application;
FIG. 5 is a plot of impedance phase versus frequency for an embodiment of the present application;
FIG. 6 is a graph of managed test result data for an embodiment of the present application;
FIG. 7 is a graph of C T variance contrast obtained by a conventional off-line test versus an on-line monitoring test of the present application;
FIG. 8 is a graph of R 1 variance contrast obtained by a conventional off-line test versus an on-line monitoring test of the present application;
FIG. 9 is a schematic diagram of the structural connections of an on-line monitoring system according to an embodiment of the present application;
fig. 10 is a schematic structural diagram of an impedance testing module according to an embodiment of the application.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention, specific embodiments of the present invention will be described below with reference to the accompanying drawings. It is evident that the drawings in the following description are only examples of the invention, from which other drawings and other embodiments can be obtained by a person skilled in the art without inventive effort.
In the description of the embodiments of the present invention, the terms "upper", "lower", "front", "rear", and the like are used for convenience of description and simplicity of operation only, and are not intended to indicate or imply that the apparatus or elements in question must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for providing a special meaning.
Referring to fig. 1, an on-line monitoring method for an ultrasonic transducer based on impedance analysis is provided according to some embodiments of the present application, which includes the following steps:
S10, switching an ultrasonic transducer from a welding mode to an impedance mode;
s20, setting sweep frequency parameters of a monitoring test according to the working frequency of the ultrasonic transducer, and monitoring the transducer;
s30, processing the monitoring test original data to obtain main characteristics representing monitoring parameters;
and S40, comparing the obtained main characteristics with standard library characteristics to evaluate the quality characteristics of the transducer.
Through on-line testing of impedance parameters of the ultrasonic transducer, various parameters representing the mechanical efficiency and electroacoustic conversion efficiency of the transducer are acquired, and a transducer characteristic management and control model is established, so that real-time on-line quality assessment of the ultrasonic transducer is realized.
Specifically, the S10 includes:
The time for switching the ultrasonic transducer from the welding mode to the impedance mode is less than 100ms; the welding mode is a first connection state of the ultrasonic transducer, and the impedance mode is a second connection state of the ultrasonic transducer.
Specifically, if the current connection line of the ultrasonic transducer is in the first connection state, the line switching can be realized by the upper computer, the switching timing diagram can be seen in fig. 2, the welding mode is in the high level, which represents that the current line action is welding, and at this time, the mode state switching is not allowed, the dotted line pulse in the upper switching signal represents that the switching operation is attempted in the welding process, but the operation is not recorded, the actual action instruction cannot be generated, the connection state is changed to the low level after the switching, which is the second connection state, and at this time, the on-line test procedure is allowed.
The time for switching the welding mode to the impedance mode is less than 100ms, so that the ultrasonic transducer can still maintain the working state of the welding mode when impedance testing is performed.
The S20 includes:
s21, determining the sweep frequency range and the number of sweep frequency points according to the resonant frequency and the anti-resonant frequency of the ultrasonic transducer.
The working frequency of the ultrasonic transducer in the receiving state is defined as resonant frequency F s, the working frequency of the ultrasonic transducer in the transmitting state is defined as anti-resonant frequency F p, and the test center frequency Fm is determined according to the designed ultrasonic transducer. Where [ F m-Fn,Fm+Fn ] contains the complete change in impedance between the resonant and antiresonant frequencies, as shown in FIG. 2, covering the upper and lower peaks of the amplitude-frequency curve and the nonlinear rise of the phase-frequency curve.
S22, establishing an equivalent circuit model of the ultrasonic transducer, and obtaining admittance and impedance of any frequency point by carrying out sweep frequency test on the ultrasonic transducer.
An ultrasonic transducer equivalent circuit model is established, dielectric loss is ignored, and as shown in fig. 3, the ultrasonic transducer equivalent circuit model can be regarded as consisting of a static branch C 0 and a dynamic branch C 1,L1,R1. Wherein C 0 is a static capacitor, C 1 is a dynamic capacitor, L 1 is a dynamic inductor, and R 1 is a dynamic resistor; the dynamic arm is associated with the resonant frequency of the transducer and changes during operation.
Static branch admittance: y 0＝jωC0;
The dynamic branch admittance:
total admittance of the transducer equivalent circuit model: y=y 0+Y1;
Y=y 0+Y1＝(G0+G1)+(B0+B1) j=g+jb; g is conductance and B is susceptance.
According to the admittance model, an admittance circle formula can be obtained: (G-1/2R 1)2+(B-ωC0)2＝(1/2R1)2) the centre and diameter of the total admittance circle.
S23, calculating test original parameters according to admittance and impedance of each frequency point to obtain an admittance circle test curve and an impedance amplitude phase curve.
As shown in fig. 4 and 5; calculating m parameters according to the fitting admittance circle special frequency points, wherein m=11: a resonant frequency F s; an antiresonant frequency F p; maximum conductance G max; half power point F 1,F2; free capacitance C T, capacitance value of piezoelectric device under 1 kHz; dynamic impedance R 1＝1/Gmax; dynamic inductance L 1＝R1/2π(F2-F1), where F 1,F2 is the half-power point; a dynamic capacitance C 1＝1/4π2Fs 2L1; mechanical quality factorStatic capacitance C 0＝CT-C1.
The S30 includes:
S31, carrying out space transformation on the data of the test original parameters to obtain high-dimensional space data.
For the m-dimensional original parameters x= { X 1,x2,…xm } obtained by the test, for any sample, the map Φ: X i→φ(xi), i=1,..
S32, establishing a feature extraction model, and carrying out feature vector analysis on the data in the high-dimensional space.
Covariance matrix for features in high-dimensional spaceFeature vector analysis is performed with λv=c F V, where λ is the feature value and V is the feature vector.
Calculated to obtainWherein α= [ α 1,α2,...αm ].
S33, solving the feature extraction model to obtain main features representing the monitoring parameters.
By defining an m×m checkweigher matrix K (x i,xj)＝φ(xi)φ(xj), a solution model λmkα=k 2 α of eigenvalue eigenvectors of K can be obtained. Where K is determined by selecting a kernel function.
And arranging the eigenvalues from large to small lambda 1≥λ2≥λ3…≥λm, and selecting the first n principal components as the feature quantity after dimension reduction. Defining the feature contribution rate after dimension reduction
In some embodiments, the number of principal features is selected according to the contribution rate, and the number of principal components n is selected according to the contribution rate, if the contribution rate of the first two feature values in the feature space phi exceeds 90%, then the number of principal components is selected to be 2.
The S40 includes:
S41, defining standard library characteristics of the ultrasonic transducer.
The main characteristics of the obtained characterization monitoring parameters are formed into a standard library by carrying out multiple tests on the ultrasonic transducers delivered from the factory; wherein the number of tests is not less than 50.
Specifically, the ultrasonic transducer delivered from the factory can be tested, and the obtained test data is used as a standard library after feature dimension reduction. The template library is established by taking the ultrasonic transducer with good impedance characteristics as a standard and establishing a transducer impedance consistency characterization model through multiple measurements.
S42, calculating the upper and lower boundaries of the standard library features.
And (3) establishing a standard template library through the optimized features, calculating the upper and lower boundaries of the standard, and judging the quality of the test sample. For the dimension n multiplied by l standard library feature sequence y obtained after dimension reduction, respectively calculating the mean value and standard deviation, wherein the mean valueFor measuring the central position of the feature, standard deviation/>To characterize the degree of discretization of the feature.
Respectively calculating the upper and lower boundaries according to the mean value and standard deviation corresponding to the n features, wherein the boundary model is as followsWherein γ,/>The coefficients are adjusted for the threshold. Defining a boundary region of n features.
S43, comparing the boundary curve of the standard library characteristics with the main characteristics of the ultrasonic transducer obtained by the current test to judge whether the ultrasonic transducer is normal or not.
As shown in fig. 6, by comparing the calculated boundary curves of the feature values with the corresponding features of the transducer test parameters, it can be determined whether the current transducer characteristics exceed the standard boundary defining area range, if the test result exceeds the upper and lower boundaries, it is determined that the ultrasonic transducer is abnormal, and if the test result is within the upper and lower boundaries, it is determined that the ultrasonic transducer is in a normal state, thereby realizing quality evaluation of the ultrasonic transducer.
By the aid of a traditional offline testing system and the online monitoring method, a free capacitor C T and a dynamic resistor R 1 which are key parameters for testing are selected for comparison. Wherein, the free capacitance C T represents the capacitance between the two polar plates of the piezoelectric vibrator, and is approximately constant when the ultrasonic transducer works; dynamic resistance R 1 characterizes the matching degree and energy conversion efficiency of the output circuit.
As shown in fig. 7 to 8, the variance of C T after ten tests of the conventional offline test system is 27.89, and the variance of r 1 is 22.07; according to the online monitoring method, the variance of C T after ten tests is 1.62, and the variance of R 1 is 0.55. Wherein the variance characterizes the consistency and stability of the test data, the smaller the variance, the higher the data consistency.
According to some embodiments of the present application, as shown in fig. 9, an on-line monitoring system for an ultrasonic transducer based on impedance analysis is further provided, which includes a host computer 1, an impedance testing module 2, an ultrasonic generator 3 and an ultrasonic triplet 4, wherein the host computer 1 is connected with the impedance testing module 2 and the ultrasonic generator 4, and the impedance testing module 2 is connected with the ultrasonic triplet 4 and the ultrasonic generator 3.
The impedance testing module 21 integrates an impedance tester function, and is used for receiving a testing instruction of the upper computer 1, starting a sweep frequency impedance testing cycle, and converting a testing parameter result into message information to be transmitted to the upper computer 1.
Further, as shown in fig. 10, the impedance testing module 2 includes a testing module 21 and a mode switching module 22; wherein, the mode switching module 22 connects the ultrasonic generator 3 and the ultrasonic triplet 4 to form a first connection state; the mode switching module 22 is connected with the test module 21 and the ultrasonic triplet 4 to form a second connection state.
Further, the first connection state and the second connection state are used for changing the welding mode and the impedance mode, when the system is in the first connection state, the ultrasonic transducer is in the welding mode, and when the system is in the second connection state, the ultrasonic transducer is in the impedance mode.
The impedance parameters of the ultrasonic transducer are tested on line in real time, the impedance testing module is controlled by the upper control instruction, the impedance testing module is switched between a working state and a testing state, the automatic line can work normally in the working state, the testing sweep frequency signal is sent in the testing state to automatically test, the testing result is uploaded to the upper computer, and the quality evaluation of the transducer is realized through an internal monitoring algorithm.
In addition, the present application provides a computer readable medium storing computer program code which, when executed by a processor, implements the above-described on-line monitoring method.
While the basic concepts have been described above, it will be apparent to those skilled in the art that the foregoing application disclosure is by way of example only and is not intended to be limiting. Although not explicitly described herein, various modifications, improvements and adaptations of the application may occur to one skilled in the art. Such modifications, improvements, and modifications are intended to be suggested within the present disclosure, and therefore, such modifications, improvements, and adaptations are intended to be within the spirit and scope of the exemplary embodiments of the present disclosure.
Meanwhile, the present application uses specific words to describe embodiments of the present application. Reference to "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic is associated with at least one embodiment of the application. Thus, it should be emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various positions in this specification are not necessarily referring to the same embodiment. Furthermore, certain features, structures, or characteristics of one or more embodiments of the application may be combined as suitable.
The computer readable medium may comprise a propagated data signal with the computer program code embodied therein, for example, on a baseband or as part of a carrier wave. The propagated signal may take on a variety of forms, including electro-magnetic, optical, etc., or any suitable combination thereof. A computer readable medium can be any computer readable medium that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code located on a computer readable medium may be propagated through any suitable medium, including radio, cable, fiber optic cable, radio frequency signals, or the like, or a combination of any of the foregoing.
Similarly, it should be appreciated that in order to simplify the present disclosure and thereby facilitate an understanding of one or more embodiments of the application, various features are sometimes grouped together in a single embodiment, figure, or description thereof. This method of disclosure does not imply that the subject application requires more features than are set forth in the claims. Indeed, less than all of the features of a single embodiment disclosed above.
In some embodiments, numbers describing the components, number of attributes are used, it being understood that such numbers being used in the description of embodiments are modified in some examples by the modifier "about," approximately, "or" substantially. Unless otherwise indicated, "about," "approximately," or "substantially" indicate that the number allows for a 20% variation. Accordingly, in some embodiments, numerical parameters set forth in the specification and claims are approximations that may vary depending upon the desired properties sought to be obtained by the individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and employ a method for preserving the general number of digits. Although the numerical ranges and parameters set forth herein are approximations in some embodiments for use in determining the breadth of the range, in particular embodiments, the numerical values set forth herein are as precisely as possible.
While the application has been described with reference to the specific embodiments presently, it will be appreciated by those skilled in the art that the foregoing embodiments are merely illustrative of the application, and various equivalent changes and substitutions may be made without departing from the spirit of the application, and therefore, all changes and modifications to the embodiments are intended to be within the scope of the appended claims.
Claims (10)
1. The ultrasonic transducer on-line monitoring method based on impedance analysis is characterized by comprising the following steps of:
S10, switching an ultrasonic transducer from a welding mode to an impedance mode;
s20, setting sweep frequency parameters of a monitoring test according to the working frequency of the ultrasonic transducer, and monitoring the transducer;
s30, processing the monitoring test original data to obtain main characteristics representing monitoring parameters;
and S40, comparing the obtained main characteristics with standard library characteristics to evaluate the quality characteristics of the transducer.
2. The method for on-line monitoring of an impedance analysis-based ultrasound transducer according to claim 1, wherein S10 comprises:
the time to switch from the welding mode to the impedance mode is less than 100ms;
the welding mode is a first connection state of the ultrasonic transducer, and the impedance mode is a second connection state of the ultrasonic transducer.
3. The method for on-line monitoring of an impedance analysis-based ultrasound transducer according to claim 1, wherein S20 comprises:
S21, determining a sweep frequency range and the number of sweep frequency points according to the resonant frequency and the anti-resonant frequency of the ultrasonic transducer;
S22, establishing an equivalent circuit model of the ultrasonic transducer, and obtaining admittance and impedance of any frequency point by carrying out sweep frequency test on the ultrasonic transducer;
S23, calculating test original parameters according to admittance and impedance of each frequency point to obtain an admittance circle test curve and an impedance amplitude phase curve.
4. The method for on-line monitoring of an impedance analysis-based ultrasound transducer according to claim 1, wherein S30 comprises:
S31, carrying out space transformation on the data of the test original parameters to obtain high-dimensional space data;
S32, establishing a feature extraction model, and carrying out feature vector analysis on data in a high-dimensional space;
s33, solving the feature extraction model to obtain main features representing the monitoring parameters.
5. The method for on-line monitoring of an impedance analysis based ultrasonic transducer according to claim 4, wherein S33 comprises:
and selecting the number of main features according to the contribution rate.
6. The method for on-line monitoring of an impedance analysis based ultrasonic transducer according to claim 1, wherein S40 comprises:
S41, defining standard library characteristics of an ultrasonic transducer;
s42, calculating the upper and lower boundaries of the standard library features;
s43, comparing the boundary curve of the standard library characteristics with the main characteristics of the ultrasonic transducer obtained by the current test to judge whether the ultrasonic transducer is normal or not.
7. The method for on-line monitoring of an impedance analysis based ultrasonic transducer according to claim 6, wherein S41 comprises:
the main characteristics of the obtained characterization monitoring parameters are formed into a standard library by carrying out multiple tests on the ultrasonic transducers delivered from the factory; wherein the number of tests is not less than 50.
8. The ultrasonic transducer on-line monitoring system based on impedance analysis is characterized by comprising an upper computer, an impedance testing module, an ultrasonic generator and an ultrasonic triplet, wherein the upper computer is connected with the impedance testing module and the ultrasonic generator, and the impedance testing module is connected with the ultrasonic triplet and the ultrasonic generator.
9. The impedance analysis based ultrasonic transducer online monitoring system of claim 8, wherein the impedance testing module comprises a testing module and a mode switching module;
The mode switching module is connected with the ultrasonic generator and the ultrasonic triple set to form a first connection state; the mode switching module is connected with the testing module and the ultrasonic triple set to form a second connection state.
10. A computer readable medium storing computer program code which, when executed by a processor, implements the method of any one of claims 1 to 7.
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