CN113984184A - Sound field detection method and detection system based on ultrasonic transducer array - Google Patents
Sound field detection method and detection system based on ultrasonic transducer array Download PDFInfo
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- G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
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Abstract
The invention discloses a sound field detection method and a system based on an ultrasonic transducer array, wherein the method comprises the following steps: scanning movement is carried out in a sound field to be detected, a position signal of the scanning movement and an acoustic signal in the sound field to be detected, which is acquired in the scanning movement process, are acquired, and the acquired acoustic signal is converted into an electric signal; carrying out multi-channel data transmission on the acquired electric signals; and analyzing the sound field detection signals according to the multi-channel data transmission signals and combining the acquired positioning information to acquire a sound field amplitude diagram and a phase diagram of spatial distribution. The ultrasonic transducer array is adopted to reduce the scanning dimension of motion scanning detection, the sound field detection efficiency is greatly improved, parallel processing of a large amount of data is realized by combining a multi-channel data acquisition device, the time consumption of data processing is reduced, and high-speed data transmission is realized.
Description
Technical Field
The invention relates to the technical field of ultrasonic signal processing, in particular to a sound field detection method and a sound field detection system based on an ultrasonic transducer array.
Background
Ultrasonic waves are widely used in the medical field due to the advantages of good directivity, large penetration depth, no harm to human bodies and the like, such as ultrasonic medical images, ultrasonic nerve regulation, ultrasonic ablation and the like, and the application of the ultrasonic technology needs to ensure the accuracy of ultrasonic medical equipment in detecting and treating a diseased part, so that the characteristics of an ultrasonic sound field emitted by the ultrasonic technology need to be detected and calibrated.
In the traditional sound field detection, a single-vibration-element ultrasonic transducer is used, and is placed in a sound field to be detected, a motion platform is required to be matched, and two-dimensional sound field distribution data are obtained in a two-dimensional point-by-point scanning mode. The conventional sound field detection technology mainly has the following problems: the time consumption of a sound field data acquisition mode of two-dimensional point-by-point scanning is long; single-point data acquisition cannot realize parallel processing; therefore, the sound field detection speed is caused to be slow. The traditional sound field detection method takes several hours to detect a two-dimensional sound field, and cannot realize real-time monitoring of the two-dimensional sound field.
Disclosure of Invention
Therefore, the invention aims to provide a sound field detection method and a detection system based on an ultrasonic transducer array, which are used for reducing the scanning dimension of motion scanning detection by adopting the ultrasonic transducer array on the basis of the application of the traditional single-vibration-element ultrasonic transducer, greatly improving the sound field detection efficiency, realizing parallel processing of a large amount of data by combining a multi-channel data acquisition device, reducing the time consumption of data processing and providing a method and a way for the rapid detection and the real-time sound field detection of the sound field of ultrasonic medical equipment.
In order to achieve the above object, the present invention provides a sound field detection method based on an ultrasonic transducer array, including the following steps:
scanning movement is carried out in a sound field to be detected, a position signal of the scanning movement and an acoustic signal in the sound field to be detected, which is acquired in the scanning movement process, are acquired, and the acquired acoustic signal is converted into an electric signal;
carrying out multi-channel data transmission on the acquired electric signals;
and analyzing the sound field detection signals according to the multi-channel data transmission signals and combining the acquired positioning information to acquire a sound field amplitude diagram and a phase diagram of spatial distribution.
Further, preferably, the sound field amplitude map and the phase map of the spatial distribution are obtained by the following steps:
s301, performing Hilbert transform on the sound field detection signal to obtain amplitude information;
s302, carrying out Fourier transform on the sound field detection signal to obtain phase information;
and S303, respectively arranging the amplitude information and the phase information in order according to the positioning information to obtain a sound field amplitude diagram and a sound field phase diagram.
The invention also provides an ultrasonic transducer array-based sound field detection system, which is used for implementing the ultrasonic transducer array-based sound field detection method, and comprises the following steps: the system comprises an ultrasonic transducer array, a motion platform, a multi-channel data acquisition device and a data processing module; the motion platform is used for carrying the ultrasonic transducer array to perform scanning motion in a sound field to be detected so as to acquire a position signal of the scanning motion; the ultrasonic transducer array is used for acquiring acoustic signals in a sound field to be detected and converting the acquired acoustic signals into electric signals; the multichannel data acquisition device is used for carrying out multichannel data transmission on the acquired electric signals; and the data processing module is used for analyzing the sound field detection signals according to the multi-channel data transmission signals and combining the acquired positioning information to acquire a sound field amplitude diagram and a phase diagram of spatial distribution.
Further preferably, the data processing module includes a hilbert transform model and a fourier transform model;
the Hilbert transform model is used for performing Hilbert transform on the sound field detection signal to obtain amplitude information;
the Fourier transform model is used for carrying out Fourier transform on the sound field detection signal to obtain phase information;
when the sound field amplitude map and the phase map which are spatially distributed are obtained, the amplitude information and the phase information are respectively arranged in order according to the positioning information, and the sound field amplitude map and the phase map can be obtained.
Further preferably, the ultrasonic transducer array includes a one-dimensional linear array, a two-dimensional array, a circular array, a convex array, and a concave array.
Further preferably, the number of channels of the multi-channel data acquisition device is greater than or equal to the number of array elements of the ultrasonic transducer array.
Further preferably, the motion platform is a three-axis motion platform with XYZ three scanning directions.
Further preferably, the data processing module performs data calculation by using a computer host, and includes loading a Matlab program in the computer host, and obtaining an amplitude map and a phase map of the cross-sectional sound field through matrix operation.
Compared with the prior art, the sound field detection method and system based on the ultrasonic transducer array at least have the following advantages:
1. the ultrasonic transducer array is adopted to reduce the scanning dimension of motion scanning detection, the sound field detection efficiency is greatly improved, parallel processing of a large amount of data is realized by combining a multi-channel data acquisition device, the time consumption of data processing is reduced, and a method and a way are provided for rapid detection and real-time sound field detection of the sound field of ultrasonic medical equipment.
2. By the ultrasonic signals transmitted by the multi-channel data and the acquired positioning information, a sound field amplitude diagram and a phase diagram in spatial distribution can be directly generated. Compared with the traditional point-by-point scanning method, the method realizes the parallel processing of data, improves the scanning progress and realizes the real-time monitoring of the two-dimensional sound field.
Drawings
FIG. 1 is a schematic diagram of the detection of the sound field of an ultrasonic array transducer according to the present invention;
FIG. 2 is a flow chart of a method of detecting a sound field of an ultrasonic array transducer of the present invention;
FIG. 3 is a configuration diagram of the two-dimensional ultrasonic transducer array sound field detection of the present invention;
FIG. 4 is a schematic diagram of a two-dimensional ultrasound transducer array of the present invention;
FIG. 5 is a flow chart of generating an amplitude map and a phase map of a sound field according to the present invention.
In the figure:
1. a pulse excitation device; 2. a single probe ultrasonic transducer; 3. the X-axis of the motion platform; 4. the Y-axis of the motion stage; 5. the Z-axis of the motion platform; 6. a two-dimensional ultrasound transducer array; 7. a multi-channel data acquisition device; 8. a master control device.
Detailed Description
The invention is described in further detail below with reference to the figures and the detailed description.
As shown in fig. 2, an embodiment of an aspect of the present invention provides a method for detecting a sound field based on an ultrasonic transducer array, including the following steps:
s1, performing scanning movement in the sound field to be detected, acquiring position signals of the scanning movement and sound signals in the sound field to be detected acquired in the scanning movement process, and converting the acquired sound signals into electric signals;
s2, carrying out multichannel data transmission on the acquired electric signals;
and S3, analyzing the sound field detection signals according to the multi-channel data transmission signals and combining the acquired positioning information to obtain a sound field amplitude diagram and a phase diagram of spatial distribution. Further preferably, as shown in fig. 5, the sound field amplitude map and the phase map of the spatial distribution are obtained by the following steps:
s301, performing Hilbert transform on the sound field detection signal to obtain amplitude information;
s302, carrying out Fourier transform on the sound field detection signal to obtain phase information;
and S303, respectively arranging the amplitude information and the phase information in order according to the positioning information to obtain a sound field amplitude diagram and a sound field phase diagram.
As shown in fig. 2-3, the present invention further provides an ultrasound transducer array-based sound field detection system, for implementing the ultrasound transducer array-based sound field detection method as described above, including: the system comprises an ultrasonic transducer array, a motion platform, a multi-channel data acquisition device and a data processing module; the motion platform is used for carrying the ultrasonic transducer array to perform scanning motion in a sound field to be detected so as to acquire a position signal of the scanning motion; the ultrasonic transducer array is used for acquiring acoustic signals in a sound field to be detected and converting the acquired acoustic signals into electric signals; the multichannel data acquisition device is used for carrying out multichannel data transmission on the acquired electric signals; and the data processing module is used for analyzing the sound field detection signals according to the multi-channel data transmission signals and combining the acquired positioning information to acquire a sound field amplitude diagram and a phase diagram of spatial distribution.
Further preferably, the data processing module includes a hilbert transform model and a fourier transform model; as shown in fig. 5, the hilbert transform model is used for hilbert transforming the sound field detection signal to obtain amplitude information; the Fourier transform model is used for carrying out Fourier transform on the sound field detection signal to obtain phase information; when the sound field amplitude map and the phase map which are spatially distributed are obtained, the amplitude information and the phase information are respectively arranged in order according to the positioning information, and the sound field amplitude map and the phase map can be obtained.
Further preferably, the ultrasonic transducer array includes a one-dimensional linear array, a two-dimensional array, a circular array, a convex array, and a concave array.
Further preferably, the number of channels of the multi-channel data acquisition device is greater than or equal to the number of array elements of the ultrasonic transducer array.
Further preferably, the motion platform is a three-axis motion platform with XYZ three scanning directions.
Further preferably, the data processing module performs data calculation by using a main control device such as a computer, and includes loading a Matlab program in a computer host, and obtaining an amplitude map and a phase map of a cross-sectional sound field through matrix operation.
As shown in fig. 3, an embodiment of the present invention provides a sound field detection method based on an ultrasonic transducer array, including a three-axis motion platform X-axis 3, Y-axis 4, Z-axis 5, a two-dimensional ultrasonic transducer array 6, a multi-channel data acquisition device 7, and a main control device 8; the sound field to be measured is generated by a single-probe ultrasonic transducer 2 and a pulse excitation device 1; the single-probe ultrasonic transducer 2 and the two-dimensional ultrasonic transducer array 6 are placed in water to facilitate the propagation of acoustic waves.
Selecting a single-probe ultrasonic transducer 2 with the center frequency of 10MHz, and measuring the underwater soundSpeed c is 1540m/s, calculation
=154 
In order to ensure the sound field detection precision, the interval between array elements is selected to be smaller than
=30.8 
The two-dimensional ultrasonic transducer array 6 is used for detecting a sound field, and the working bandwidth range of the two-dimensional ultrasonic transducer array 6 needs to cover 10MHz, so that better sound signal receiving performance is obtained.
The excitation modes of the single-probe ultrasonic transducer 2 generally include two types, namely continuous excitation and pulse excitation, in the embodiment, the pulse excitation device 1 is selected for pulse excitation, the pulse excitation is a broadband short pulse signal, and a sound field generated by the pulse-excited ultrasonic transducer does not exist stably, so that the excitation synchronous signal of the pulse excitation device 1 needs to be connected to the multi-channel data acquisition device 7 to synchronize the acquisition of the sound field signal, and some multi-channel data acquisition devices may have a channel trigger acquisition function and may not need to be connected with the excitation synchronous signal.
As shown in fig. 4, the single-probe ultrasonic transducer 2 is aligned with the center of the two-dimensional ultrasonic transducer array 6 and the detection surface of the two-dimensional ultrasonic transducer array 6 is ensured to be parallel to the section of the detected sound field emitted by the single-probe ultrasonic transducer 2. As shown in fig. 3, a two-dimensional ultrasound transducer array 6 is mechanically connected to a Z-axis 4 of a three-axis motion platform, and is electrically connected to a multi-channel data acquisition device 7, and the multi-channel data acquisition device 7 is electrically connected to a main control device 8, the three- axis motion platform 3, 4, 5 selected in this embodiment has three scanning directions of XYZ, and the motion scanning mode and the positioning information thereof are operated by the device 8, and the main control device 8 is internally provided with motion control software and data processing software.
In this embodiment, a two-dimensional ultrasonic transducer array is adopted6, when cross-section sound field detection is carried out, a sound field image of the whole surface can be collected through one-time excitation of the single-probe ultrasonic transducer 2, then data are transmitted back to the main control equipment 8 for parallel sound field data processing, if a traditional sound field detection technology is adopted, S-curve scanning needs to be carried out on the sound field detection of one cross section by matching with two motion axes, each sound field detection point needs to be stopped, cross-section sound field detection with the same size is large in time consumption difference, data transmission sequence exists, and the time consumption of data processing cannot be reduced; when the three-dimensional sound field is detected, the two-dimensional ultrasonic transducer array 6 moves along the X axis 3 of the three-axis motion platform to be smaller than the X axis 3
=30.8 
The motion step scanning is needed, and if the three-dimensional sound field detection is implemented by adopting the traditional sound field detection technology, the time consumption is long for several days, and the time cost is too high.
The single section sound field signal collected by the two-dimensional ultrasonic transducer array 6 is converted into three-dimensional matrix data for software processing, Matlab is selected as data processing software in the main control device 8, and an amplitude diagram and a phase diagram of the section sound field are obtained through matrix operation.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (8)
1. A sound field detection method based on an ultrasonic transducer array is characterized by comprising the following steps:
scanning movement is carried out in a sound field to be detected, a position signal of the scanning movement and an acoustic signal in the sound field to be detected, which is acquired in the scanning movement process, are acquired, and the acquired acoustic signal is converted into an electric signal;
carrying out multi-channel data transmission on the acquired electric signals;
and analyzing the sound field detection signals according to the multi-channel data transmission signals and combining the acquired positioning information to acquire a sound field amplitude diagram and a phase diagram of spatial distribution.
2. The method for detecting sound field based on ultrasonic transducer array according to claim 1, wherein the sound field amplitude map and phase map of the spatial distribution are obtained by the following steps:
s301, performing Hilbert transform on the sound field detection signal to obtain amplitude information;
s302, carrying out Fourier transform on the sound field detection signal to obtain phase information;
and S303, respectively arranging the amplitude information and the phase information in order according to the positioning information to obtain a sound field amplitude diagram and a sound field phase diagram.
3. An ultrasonic transducer array based sound field detection system for implementing the ultrasonic transducer array based sound field detection method of claim 1 or 2, comprising: the system comprises an ultrasonic transducer array, a motion platform, a multi-channel data acquisition device and a data processing module;
the motion platform is used for carrying the ultrasonic transducer array to perform scanning motion in a sound field to be detected so as to acquire a position signal of the scanning motion;
the ultrasonic transducer array is used for acquiring acoustic signals in a sound field to be detected and converting the acquired acoustic signals into electric signals;
the multichannel data acquisition device is used for carrying out multichannel data transmission on the acquired electric signals;
and the data processing module is used for analyzing the sound field detection signals according to the multi-channel data transmission signals and combining the acquired positioning information to acquire a sound field amplitude diagram and a phase diagram of spatial distribution.
4. The ultrasonic transducer array-based sound field detection system of claim 3, wherein the data processing module comprises a Hilbert transform model and a Fourier transform model;
the Hilbert transform model is used for performing Hilbert transform on the sound field detection signal to obtain amplitude information;
the Fourier transform model is used for carrying out Fourier transform on the sound field detection signal to obtain phase information;
when the sound field amplitude map and the phase map which are spatially distributed are obtained, the amplitude information and the phase information are respectively arranged in order according to the positioning information, and the sound field amplitude map and the phase map can be obtained.
5. The ultrasonic transducer array-based sound field detection system of claim 3, wherein the ultrasonic transducer array comprises a one-dimensional linear array, a two-dimensional array, a circular array, a convex array, a concave array.
6. The ultrasonic transducer array-based sound field detection system according to claim 3, wherein the number of channels of a multi-channel data acquisition device is greater than or equal to the number of array elements of the ultrasonic transducer array.
7. The ultrasonic transducer array-based sound field detection system according to claim 3, wherein the motion stage is a three-axis motion stage with XYZ three scanning directions.
8. The system of claim 3, wherein the data processing module is configured to perform data calculation by using a host computer, and includes loading a Matlab program in the host computer, and obtaining an amplitude map and a phase map of the cross-sectional sound field through matrix operation.
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