CN118010850A - Portable ultrasonic CT imaging device and use method thereof - Google Patents
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Abstract
The invention discloses a portable ultrasonic CT imaging device and a use method thereof, wherein the device comprises the following steps: the device comprises a channel converter, an operation terminal, a plurality of needle-type ultrasonic transducers, a plurality of ultrasonic transducers and a control unit, wherein the operation terminal is connected with one end of the channel converter; the operation terminal is used for inputting and outputting signals, the needle-shaped ultrasonic transducers are connected with the wood component to be detected to obtain ultrasonic stress wave signals of the wood component to be detected, and damage detection of the wood component to be detected is achieved. The portable ultrasonic imaging device is adopted, so that the portable ultrasonic imaging device is convenient to carry and operate by personnel, is less limited by sites, and is suitable for detection of engineering sites; the needle-type ultrasonic transducer provided by the invention can flexibly select the number of transducers according to the size of the wood member to be tested, can be suitable for the wood members to be tested with different cross-sectional shapes, and has the advantage of strong cross-sectional applicability.
Description
Technical Field
The invention belongs to the technical field of imaging of ancient building wood members, and particularly relates to a portable ultrasonic CT imaging device and a using method thereof.
Background
The stress wave tomography system is increasingly applied to forestry resource evaluation and ancient architecture detection protection according to the interaction of solid internal defects and stress waves. However, current stress wave imaging systems image by low frequency stress waves generated by the percussion device. In view of the fact that the detection resolution of stress waves is proportional to the frequency of the stress waves, the low-frequency detection means is difficult to find tiny damages inside the ancient timber structure, and early warning and timely intervention capability of early internal damages are further affected.
Ultrasonic tomography (Computed Tomography, CT) is widely used in medical and nondestructive testing fields due to its high-precision imaging effect. However, ultrasound CT imaging systems in these fields are not easily mobile due to their bulkiness, making them difficult to use for portable field detection. At the same time, the mismatch in curvature of the ultrasonic transducer also limits its application to the detection of commonly geometric monument wood components. In addition, the traditional method for imaging the ancient building wood structure has the defects that the stress wave is greatly attenuated in the transmission process due to the anisotropy of the wood, and the signal-to-noise ratio of the acquired stress wave signal is low, so that the imaging precision is low.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides a portable ultrasonic CT imaging apparatus and a method for using the same, so as to solve the problems of the prior art.
To achieve the above object, the present invention provides a portable ultrasonic CT imaging apparatus comprising:
the device comprises a channel converter, an operation terminal, a plurality of needle-type ultrasonic transducers, a plurality of ultrasonic transducers and a control unit, wherein the operation terminal is connected with one end of the channel converter;
the operation terminal is used for inputting and outputting signals, the needle-shaped ultrasonic transducers are connected with the wood component to be detected to obtain ultrasonic stress wave signals of the wood component to be detected, and damage detection of the wood component to be detected is achieved.
Preferably, the operation terminal is provided with a first terminal for outputting the excitation signal and a second terminal for inputting the acquisition signal.
Preferably, one end of the channel converter is provided with a third binding post and a fourth binding post, the third binding post is connected with the first binding post through a first wire, and the fourth binding post is connected with the second binding post through a second wire.
Preferably, the other end of the channel converter is provided with a plurality of binding posts, and the binding posts are respectively connected with the needle-type ultrasonic transducers through a plurality of wires.
Preferably, the needle-type ultrasonic transducer includes: the first connector, the piezoelectric element connected with the first connector and realizing energy conversion, the second connector connected with the piezoelectric element, the needle-type transducer head connected with the second connector and the wood component to be tested respectively, and the binding post connected with the channel converter;
wherein the first connector is used for sending the space position information of the needle type ultrasonic transducer.
Preferably, the operation terminal includes: the system comprises a signal excitation module, a power amplification module, a signal acquisition module, a data storage module and a data analysis module;
the signal excitation module is used for outputting excitation signals and setting parameters;
the power amplification module is used for carrying out voltage amplification on the excitation signal to obtain a high-energy signal;
The signal acquisition module is used for acquiring ultrasonic stress wave signals of the wood component to be tested in a multi-channel manner;
The data storage module is used for storing the propagation path of the ultrasonic stress wave signal;
And the data analysis module is used for carrying out imaging analysis on the spatial position information and the ultrasonic stress wave signals.
In order to achieve the technical purpose, the invention also provides a using method of the portable ultrasonic CT imaging device, based on the portable ultrasonic CT imaging device for wood member damage detection, the method comprises the following steps:
Outputting an excitation signal through the operation terminal;
converting the excitation signal through a channel converter to realize that the curvature of the needle-type ultrasonic transducer is matched with the shape of the wood member to be detected;
And acquiring ultrasonic stress wave signals of the wood component to be detected through the needle-type ultrasonic transducer, transmitting the spatial position information of the needle-type ultrasonic transducer and the ultrasonic stress wave signals to the operation terminal, performing imaging analysis, and realizing damage detection of the wood component to be detected based on an imaging analysis result.
Preferably, the process of sending to the operation terminal and performing imaging analysis includes:
And receiving flight time parameters of the transmission waves on different propagation paths through the operation terminal, and based on the flight time parameters, reconstructing wave velocity distribution in a medium through inverse transformation, imaging the wood member to be tested to obtain a plurality of single-frequency slowness distribution graphs, and superposing the single-frequency slowness distribution graphs to obtain a damage inversion imaging result of multi-frequency comprehensive diagnosis.
Compared with the prior art, the invention has the following advantages and technical effects:
The invention provides a portable ultrasonic CT imaging device, which comprises: the device comprises a channel converter, an operation terminal, a plurality of needle-type ultrasonic transducers, a plurality of ultrasonic transducers and a control unit, wherein the operation terminal is connected with one end of the channel converter; the operation terminal is used for inputting and outputting signals, the needle-shaped ultrasonic transducers are connected with the wood component to be detected to obtain ultrasonic stress wave signals of the wood component to be detected, and damage detection of the wood component to be detected is achieved. The portable ultrasonic imaging device is adopted, so that the portable ultrasonic imaging device is convenient to carry and operate by personnel, is less limited by sites, and is suitable for detection of engineering sites; the needle-type ultrasonic transducer provided by the invention can flexibly select the number of transducers according to the size of the wood member to be tested, can be suitable for the wood members to be tested with different cross-sectional shapes, and has the advantage of strong cross-sectional applicability.
The invention also provides a use method of the portable ultrasonic CT imaging device, which comprises the following steps: outputting an excitation signal through the operation terminal; converting the excitation signal through a channel converter to realize that the curvature of the needle-type ultrasonic transducer is matched with the shape of the wood member to be detected; and acquiring ultrasonic stress wave signals of the wood component to be detected through the needle-type ultrasonic transducer, transmitting the spatial position information of the needle-type ultrasonic transducer and the ultrasonic stress wave signals to the operation terminal, performing imaging analysis, and realizing damage detection of the wood component to be detected based on an imaging analysis result. The invention provides a multi-frequency comprehensive slowness imaging method according to the relation between ultrasonic excitation frequency and flaw detection sensitivity, and has the advantage of high imaging precision.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
FIG. 1 is a schematic diagram of a portable ultrasound CT imaging device connection according to an embodiment of the present invention;
FIG. 2 is a flow chart of a portable ultrasonic CT imaging device according to an embodiment of the present invention;
Fig. 3 is a schematic diagram illustrating the internal functional modules of an operation terminal according to an embodiment of the present invention;
FIG. 4 is a schematic view of the internal structure of an ultrasonic transducer according to an embodiment of the present invention;
FIG. 5 is a diagram illustrating an exemplary ray tracing of ultrasonic stress waves of a detection section in accordance with an embodiment of the present invention;
FIG. 6 is an exemplary graph of ultrasound CT imaging results in accordance with an embodiment of the present invention;
Wherein, 01-wood component to be measured; 02-channel transducer, 03-operation terminal, 04-needle type ultrasonic transducer, 401 is first connector, 402-piezoelectric sensing element, 403 is second connector, 404 is needle type transducer head, 405-BNC female terminal.
Detailed Description
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer executable instructions, and that although a logical order is illustrated in the flowcharts, in some cases the steps illustrated or described may be performed in an order other than that illustrated herein.
Example 1
As shown in fig. 1, there is provided in the present embodiment a portable ultrasonic CT imaging apparatus for wood member damage detection, including:
the device comprises a channel converter, an operation terminal, a plurality of needle-type ultrasonic transducers, a plurality of ultrasonic transducers and a control unit, wherein the operation terminal is connected with one end of the channel converter;
the operation terminal is used for inputting and outputting signals, the needle-shaped ultrasonic transducers are connected with the wood component to be detected to obtain ultrasonic stress wave signals of the wood component to be detected, and damage detection of the wood component to be detected is achieved.
Further, the operation terminal is provided with a first binding post and a second binding post, the first binding post is used for outputting an excitation signal, and the second binding post is used for inputting an acquisition signal.
Further, one end of the channel converter is provided with a third binding post and a fourth binding post, the third binding post is connected with the first binding post through a first wire, and the fourth binding post is connected with the second binding post through a second wire.
Further, the other end of the channel converter is provided with a plurality of binding posts, and the binding posts are respectively connected with the needle-type ultrasonic transducers through a plurality of wires.
Specifically, one side of the channel converter 02 is provided with 2 BNC female terminals for connecting signal input and signal output of the operation terminal 03, and the other side of the channel converter 02 is provided with n BNC female terminals for connecting a needle-type ultrasonic transducer; it should be noted that the number of n should be identical to the number of needle-type ultrasonic transducers, and in order to obtain good imaging results, n should be 8 or more, in this schematic diagram, the number of n is 8;
The operation terminal 03 is a control center of the whole portable imaging device, excitation parameter setting, signal excitation and acquisition, result analysis and the like are carried out on the operation terminal 03, the operation terminal 03 is provided with two BNC female terminal posts which are respectively used for outputting excitation signals and inputting acquisition signals, the operation terminal 03 and the channel converter 02 are connected through two connecting wires, and two ends of each connecting wire are BNC male interfaces;
The needle type ultrasonic transducer 04 is a core sensing element of a portable imaging system, is connected with a wood member 01 to be detected through a needle type probe, a BNC female head interface is arranged on the side face of the needle type ultrasonic transducer 04, and is connected with the channel converter 02 through a connecting wire.
Further, the needle-type ultrasonic transducer includes: the first connector, the piezoelectric element connected with the first connector and realizing energy conversion, the second connector connected with the piezoelectric element, the needle-type transducer head connected with the second connector and the wood component to be tested respectively, and the binding post connected with the channel converter; wherein the first connector is used for sending the space position information of the needle type ultrasonic transducer.
Specifically, as shown in fig. 4, a first connector 401 is used for connecting a piezoelectric sensing element 402 and a lateral BNC female terminal 405, the acoustic impedance of the material of the first connector 401 is determined by matching the acoustic impedance value of wood with the acoustic impedance value of the material of the piezoelectric element, and a positioning module and a communication module are included in the first connector 401 and used for sending the space position information of the transducer to an operation terminal;
The piezoelectric element 402 has a function of converting electric energy into mechanical energy by an inverse piezoelectric effect to generate stress waves in the wood member to be measured, and a function of converting mechanical energy generated by deformation of the wood member to be measured into electric energy by a positive piezoelectric effect to output an electric signal. When the ultrasonic transducer is used as a driver, an inverse piezoelectric effect is generated, whereas when the transducer is used as a sensor, a positive piezoelectric effect is generated;
a second connection body 403 for connecting the piezoelectric element 402 and the needle-type transducer head 404;
A needle-type transducer head 404 for connecting the wood member 01 to be tested and forming a measuring point at a corresponding position;
The BNC female terminal 405, which acts as a connection wire with a BNC male, is connected to the channel converter 02.
Further, the operation terminal includes: the system comprises a signal excitation module, a power amplification module, a signal acquisition module, a data storage module and a data analysis module;
the signal excitation module is used for outputting excitation signals and setting parameters;
the power amplification module is used for carrying out voltage amplification on the excitation signal to obtain a high-energy signal;
The signal acquisition module is used for acquiring ultrasonic stress wave signals of the wood component to be tested in a multi-channel manner;
The data storage module is used for storing the propagation path of the ultrasonic stress wave signal;
And the data analysis module is used for carrying out imaging analysis on the spatial position information and the ultrasonic stress wave signals.
Specifically, as shown in fig. 3, the signal excitation module 301 supports the excitation of sine waves, cosine waves, square waves, triangular waves and custom waveforms, and the setting of parameters such as signal amplitude, frequency and interval time; the power amplification module 302 is configured to amplify the excitation signal by a voltage multiple to obtain higher signal energy, where the amplification factor of the power amplification module supports customization and can be accurate to two decimal places; the signal acquisition module 303 supports high-frequency synchronous sampling of the multichannel signals, and the single-channel sampling frequency is not lower than 2MHz/s, and the triggering condition of the acquisition channels is synchronous triggering of the excitation signals; the data storage module 304 is used for automatically naming and storing signals according to an ultrasonic stress wave propagation path formed by the driver and the sensor; the data analysis module 305 functions to invoke the sensor spatial location distribution information and ultrasonic stress wave signals of the propagation path for imaging result calculation and visualization using the imaging method presented herein.
The beneficial effects of the embodiment are that:
The invention provides a portable ultrasonic CT imaging device, which comprises: the device comprises a channel converter, an operation terminal, a plurality of needle-type ultrasonic transducers, a plurality of ultrasonic transducers and a control unit, wherein the operation terminal is connected with one end of the channel converter; the operation terminal is used for inputting and outputting signals, the needle-shaped ultrasonic transducers are connected with the wood component to be detected to obtain ultrasonic stress wave signals of the wood component to be detected, and damage detection of the wood component to be detected is achieved. The portable ultrasonic imaging device is adopted, so that the portable ultrasonic imaging device is convenient to carry and operate by personnel, is less limited by sites, and is suitable for detection of engineering sites; the needle-type ultrasonic transducer provided by the invention can flexibly select the number of transducers according to the size of the wood member to be tested, can be suitable for the wood members to be tested with different cross-sectional shapes, and has the advantage of strong cross-sectional applicability.
Example two
The embodiment provides a use method of a portable ultrasonic CT imaging device, based on the portable ultrasonic CT imaging device for wood member damage detection, the method comprises the following steps:
Outputting an excitation signal through the operation terminal;
converting the excitation signal through a channel converter to realize that the curvature of the needle-type ultrasonic transducer is matched with the shape of the wood member to be detected;
And acquiring ultrasonic stress wave signals of the wood component to be detected through the needle-type ultrasonic transducer, transmitting the spatial position information of the needle-type ultrasonic transducer and the ultrasonic stress wave signals to the operation terminal, performing imaging analysis, and realizing damage detection of the wood component to be detected based on an imaging analysis result.
Specifically, as shown in fig. 2, the method includes the steps of:
s1, determining the number n of measuring points and the positions of the measuring points based on the geometric dimension of a wood member to be measured, and installing and fixing a needle-type transducer at the positions of the measuring points;
s2, sequentially connecting n transducers, a channel converter and an operation terminal according to the figure 1;
S3, finishing the selection of excitation signals and parameter setting on an operation terminal panel, wherein the excitation signals provided by the operation terminal panel comprise sine waves, cosine waves, square waves, triangular waves and custom waveforms, and the parameter setting comprises the amplitude, frequency and interval time of the excitation signals;
s4, positioning the space position of the transducer through a positioning module of the needle-type ultrasonic transducer, generating a vacancy position distribution diagram of the transducer on an operation terminal panel, and storing the space position coordinate of each transducer connected to the wood member to be tested;
S5, selecting an ith transducer as a driver, using the rest n-1 transducers as sensors, performing primary signal excitation and acquisition, storing ultrasonic stress wave signals of n-1 propagation paths, traversing all n sensors in sequence, and storing ultrasonic stress wave signals of n x (n-1) propagation paths altogether, wherein the parameters of the excitation signals must be kept consistent during traversing;
S6, clicking a data analysis button at an operation terminal, generating a propagation path ray tracing diagram according to the space position of the transducer, and generating a single-frequency imaging result diagram according to the imaging method provided by the invention, wherein the imaging result diagram is a slowness distribution diagram.
And S7, maintaining the type of the excitation signal and other parameters, only changing the excitation frequency, repeating the steps S4 to S6, sequentially obtaining imaging result diagrams under different excitation frequencies, and superposing the single-frequency imaging result diagrams to obtain the comprehensive diagnosis imaging diagram.
In the embodiment, the excitation electric signal generates stress wave in the wood member to be tested through the inverse piezoelectric effect of the piezoelectric element built in the needle-type ultrasonic transducer, and the stress wave passes through the cross section and is collected by the portable operation terminal through the positive piezoelectric effect of the sensor. And traversing n transducers, collecting n× (n-1) ultrasonic stress wave signals altogether, and analyzing and imaging the data.
Further, the process of sending to the operation terminal and performing imaging analysis includes:
And receiving flight time parameters of the transmission waves on different propagation paths through the operation terminal, and based on the flight time parameters, reconstructing wave velocity distribution in a medium through inverse transformation, imaging the wood member to be tested to obtain a plurality of single-frequency slowness distribution graphs, and superposing the single-frequency slowness distribution graphs to obtain a damage inversion imaging result of multi-frequency comprehensive diagnosis.
Specifically, the imaging method is based on the following principle: when holes exist in the wood member to be tested, the cavity defects on the propagation path change the propagation mode and propagation characteristics of the wood member to be tested, so that the acoustic parameters of the transmitted wave of the receiving end are affected. The propagation speed of the transmission wave is a function of the space coordinates of the medium, and the medium defect positioning is realized by receiving the flight time (Time ofFight, TOF) information of the transmission wave on different propagation paths and reconstructing the wave speed distribution in the medium by inverse transformation through TOF parameters.
TOF of any propagation path of ultrasonic stress wave can be expressed as line integral of a slowness function s (x, y) along a path L, the slowness is a derivative of speed, x, y represents any position of a cross section of a wood member to be detected, and a calculation formula of TOF is as follows:
Wherein L represents the linear propagation path of ultrasonic stress wave formed by any exciter and sensor in the cross section of the wood component to be detected, and can be expressed as L t,θ: xcos θ+ ysin θ=t, wherein t and θ are position parameters of the straight line L, θ is an included angle formed by the straight line L and plane coordinates from an x axis, and t represents the projection of a vector formed by any point (x, y) and an origin on a unit vector (cos θ, sin θ). l is the projection of a vector formed by any point (x, y) and the origin on a unit vector (-sin theta, cos theta).
Imaging the internal defect of the wood member to be measured means solving the velocity distribution of the internal ultrasonic stress wave, and as slowness is the derivative of velocity, solving the slowness distribution can also image the defect, namely performing inverse transformation on the solution of TOF:
In the method, in the process of the invention, For the one-dimensional fourier transform of the TOF of this propagation path with respect to the parameter t, namely:
In actual solution, the solution of the continuous image function s (x, y) is not unique, as the transmission wave propagation path tends to be finite. Thus, the plane of the medium is typically discretized into a grid of pixels, each grid being referred to as a picture element, assuming that the medium is uniform within each picture element, i.e. the wave velocity within each picture element is constant. And (3) equivalent TOF data of each stress wave propagation path to the sum of flight time of all pixels through which the ray passes, and solving a non-adaptive equation set of a plurality of propagation rays through simultaneous, so as to obtain the step of medium wave velocity and generate a CT image.
The time of flight ti of the ultrasound transmitted wave in the medium at the ith path is the sum of the durations in all pixel cells and can be expressed as:
where vj represents the speed of the jth pixel element, and if each pixel element is small enough, v j can be considered a constant; d ij denotes the length of the ith path in the jth pixel cell; s j＝1/vj, called slowness, m denotes the number of cells through i paths.
All measurement paths can be expressed by the following linear equation:
Where n represents the number of ray paths.
According to the principle, the discrete image reconstruction problem is converted into a series of ultrasonic transmission wave travel times t i, an image vector, namely the slowness s j in a propagation medium is calculated, and a slowness distribution image is output. Due to the difference of ultrasonic wavelengths of different frequencies, the identification sensitivity of the size of the defect is different, the slowness distribution map of the internal space of the wood member under different excitation frequencies is sequentially calculated, and the slowness distribution map of multi-frequency perception is fused, so that the damage inversion imaging result of multi-frequency comprehensive diagnosis is obtained.
In the ray tracing diagram example, the starting point of each straight line in fig. 5 is the measuring point position of the needle-type ultrasonic transducer, each straight line represents two stress wave propagation paths in the ideal condition inside the wood member to be measured, and the starting points of the straight lines are the driver positions and the sensor positions of the two propagation paths respectively. From this, it is found that when the number of needle-type ultrasonic transducers connected to the wood member to be measured is n, the number of total propagation paths is n× (n-1). The number of grids in the figure is set at an operation terminal, and the function of the grid is to discretize and solve the time integral of the ultrasonic stress wave speed along the propagation path when the imaging method is provided according to the invention.
As an example of the imaging result graph, the gray value of each grid in fig. 6 represents the slowness of the stress wave in the grid, and the slowness is the derivative of the propagation speed, so that it is known that the slower the propagation speed of the stress wave at the grid position with higher gray value, the slower the propagation speed represents the greater possibility of defects at the position inside the wood member to be measured. So that the internal defect can be judged according to the imaging result diagram.
The beneficial effects of this embodiment are:
According to the embodiment, a multi-frequency comprehensive slowness imaging method is provided according to the relation between ultrasonic excitation frequency and flaw detection sensitivity, and the method has the advantage of high imaging precision.
The present application is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present application are intended to be included in the scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.
Claims (8)
1. A portable ultrasound CT imaging apparatus, comprising: the device comprises a channel converter, an operation terminal, a plurality of needle-type ultrasonic transducers, a plurality of ultrasonic transducers and a control unit, wherein the operation terminal is connected with one end of the channel converter;
the operation terminal is used for inputting and outputting signals, the needle-shaped ultrasonic transducers are connected with the wood component to be detected to obtain ultrasonic stress wave signals of the wood component to be detected, and damage detection of the wood component to be detected is achieved.
2. The portable ultrasonic CT imaging device of claim 1, wherein the operating terminal is provided with a first terminal for outputting an excitation signal and a second terminal for inputting an acquisition signal.
3. The portable ultrasonic CT imaging device of claim 2, wherein a third terminal and a fourth terminal are provided at one end of the channel changer, the third terminal being connected to the first terminal by a first wire, the fourth terminal being connected to the second terminal by a second wire.
4. The portable ultrasonic CT imaging apparatus of claim 1, wherein a plurality of terminals are provided at the other end of the channel converter, and the plurality of terminals are respectively connected to a plurality of needle-type ultrasonic transducers through a plurality of wires.
5. The portable ultrasound CT imaging device of claim 1, wherein the needle-type ultrasound transducer comprises: the first connector, the piezoelectric element connected with the first connector and realizing energy conversion, the second connector connected with the piezoelectric element, the needle-type transducer head connected with the second connector and the wood component to be tested respectively, and the binding post connected with the channel converter;
wherein the first connector is used for sending the space position information of the needle type ultrasonic transducer.
6. The portable ultrasonic CT imaging device of claim 5, wherein the operating terminal comprises: the system comprises a signal excitation module, a power amplification module, a signal acquisition module, a data storage module and a data analysis module;
the signal excitation module is used for outputting excitation signals and setting parameters;
the power amplification module is used for carrying out voltage amplification on the excitation signal to obtain a high-energy signal;
The signal acquisition module is used for acquiring ultrasonic stress wave signals of the wood component to be tested in a multi-channel manner;
The data storage module is used for storing the propagation path of the ultrasonic stress wave signal;
And the data analysis module is used for carrying out imaging analysis on the spatial position information and the ultrasonic stress wave signals.
7. A method of using a portable ultrasound CT imaging device, characterized in that it is based on the portable ultrasound CT imaging device of any of claims 1-6, said method comprising the steps of:
Outputting an excitation signal through the operation terminal;
converting the excitation signal through a channel converter to realize that the curvature of the needle-type ultrasonic transducer is matched with the shape of the wood member to be detected;
And acquiring ultrasonic stress wave signals of the wood component to be detected through the needle-type ultrasonic transducer, transmitting the spatial position information of the needle-type ultrasonic transducer and the ultrasonic stress wave signals to the operation terminal, performing imaging analysis, and realizing damage detection of the wood component to be detected based on an imaging analysis result.
8. The method of using a portable ultrasonic CT imaging device of claim 7, wherein the process of transmitting to the operator terminal and performing an imaging analysis comprises:
And receiving flight time parameters of the transmission waves on different propagation paths through the operation terminal, and based on the flight time parameters, reconstructing wave velocity distribution in a medium through inverse transformation, imaging the wood member to be tested to obtain a plurality of single-frequency slowness distribution graphs, and superposing the single-frequency slowness distribution graphs to obtain a damage inversion imaging result of multi-frequency comprehensive diagnosis.
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