Sound field distribution measuring method and measuring device of ultrasonic transducer

Abstract

The invention discloses a sound field distribution measuring method and device of an ultrasonic transducer, and relates to the technical field of ultrasonic detection. The method comprises the following steps: collecting echo signals at different distances by moving an ultrasonic transducer, and obtaining a sound field energy value corresponding to a relative sound pressure level of the ultrasonic transducer based on the echo signals at different distances; the method comprises the following steps: acquiring echo signals at different angles by rotating an ultrasonic transducer, and obtaining an angle energy value corresponding to a directional angle of the ultrasonic transducer based on the echo signals at different angles; based on the sound field energy value and the angle energy value, corresponding coordinate values of the relative sound pressure level and the directional angle of the ultrasonic transducer are obtained; and drawing a sound field distribution directional diagram based on the corresponding coordinate values of the relative sound pressure level and the directional angle. According to the scheme, the directional angle of the ultrasonic transducer can be obtained, detailed distribution of sound field energy can be measured at the same time, more comprehensive and accurate performance data of the ultrasonic transducer are provided, and the accuracy of product evaluation and design is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of ultrasonic detection, and in particular to a method and a device for measuring the sound field distribution of an ultrasonic transducer. Background Art

[0002] Ultrasonic transducers are devices that use ultrasonic signals to convert energy and are widely used in the fields of industry, medical treatment, consumer electronics, etc. In the prior art, there are large differences in the test methods for the emission angle of ultrasonic transducers, especially in different industries where the standards and equipment used are different, resulting in inconsistent test results. Current measurement schemes mainly focus on measuring the pointing angle of the ultrasonic transducer, that is, the angular range in which it can detect obstacles. However, these schemes can only provide the angle information of the ultrasonic wave and cannot measure the distribution of its sound field energy.

[0003] For many application scenarios, especially cleaning equipment, automation systems or sensor applications in complex environments, measuring the pointing angle alone is not enough to accurately evaluate the working performance of the ultrasonic transducer. For example, when detecting ground materials, the ultrasonic sensor may encounter obstacles, which may cause its pointing direction to shift, causing the echo energy to change, leading to misjudgment of the ground material. Therefore, the distribution of sound field energy is of great significance for optimizing the design of ultrasonic transducers, improving equipment compatibility and work efficiency. In the prior art, although the sound field energy distribution can be directly measured by professional acoustic measurement equipment, these devices are expensive and difficult to be widely used in the product development process. Especially in the multiple iterative optimization designs of products such as cleaning equipment, the frequent use of high-cost equipment will significantly increase development expenses.

[0004] Therefore, how to design a more economical and efficient measurement method that can simultaneously obtain the directivity angle and sound field energy distribution has become an urgent problem to be solved in the industry. Summary of the invention

[0005] The purpose of the present invention is to provide a method and device for measuring the sound field distribution of an ultrasonic transducer. By changing the test distance and rotation angle, the directional angle and sound field energy distribution of the ultrasonic transducer are obtained, providing technical support for product performance comparison and optimized design.

[0006] To achieve the above object, the present invention discloses the following technical solution:

[0007] A first aspect of the present invention provides a method for measuring the sound field distribution of an ultrasonic transducer, the method comprising the following steps:

[0008] The ultrasonic transducer is moved to collect echo signals at different distances, and based on the echo signals at different distances, a sound field energy value corresponding to a relative sound pressure level of the ultrasonic transducer is calculated;

[0009] The ultrasonic transducer is rotated to collect echo signals at different angles, and based on the echo signals at different angles, an angle energy value corresponding to the directional angle of the ultrasonic transducer is calculated;

[0010] Based on the sound field energy value and the angle energy value, obtaining the corresponding coordinate values ​​of the relative sound pressure level and the directional angle of the ultrasonic transducer;

[0011] Based on the corresponding coordinate values ​​of the relative sound pressure level and the directional angle, a sound field distribution direction diagram is drawn to analyze the sound field distribution of the ultrasonic transducer.

[0012] Optionally, in the above-mentioned sound field distribution measurement method, the echo signal acquisition method at different distances is the average value method, and when the measurement distance is r, the sound field energy value of the ultrasonic transducer is:

[0013] X0=(x1+x2+x3+……x N ) / N (1),

[0014] Where N is the number of sampling points within the measurement distance r, x N is the sound field energy value of the Nth sampling point, and X0 is the average value of the sound field energy values ​​of the N sampling points within the measurement distance r.

[0015] Furthermore, in the above-mentioned sound field distribution measurement method, the sound field energy value corresponding to the relative sound pressure level of the ultrasonic transducer is calculated based on the echo signals at different distances, including:

[0016] According to the calculation formula of sound pressure level, when the measuring distance is r, the sound pressure level of the ultrasonic transducer is:

[0017]

[0018] Among them, P ref =20μPa represents the reference sound pressure, P represents the sound pressure, and the sound pressure P is calculated by the following formula:

[0019]

[0020] Where ρ is the air density, S d is the vibration area of ​​the ultrasonic transducer, a is the vibration acceleration;

[0021] Based on the inverse square law, the measured distances are 2 k ×r, the relative sound pressure level SPL of the ultrasonic transducer k Harmony field energy value X k , get the relative sound pressure level SPL k With the sound field energy value X k , where k is an integer.

[0022] Optionally, in the above-mentioned sound field distribution measurement method, the echo signal acquisition method at different angles is the average value method. When the measurement angle is θ, the angle energy value of the ultrasonic transducer is:

[0023] Y1 = (y1 + y2 + y3 + ... y M ) / M (4),

[0024] Where M is the number of sampling points within the measurement angle θ, y M is the angular energy value of the Mth sampling point, and Y1 is the average angular energy value of the M sampling points within the measurement angle θ.

[0025] Furthermore, in the above-mentioned sound field distribution measurement method, the angle energy value corresponding to the directional angle of the ultrasonic transducer is calculated based on the echo signals at different angles, including:

[0026] The pointing angle of the ultrasonic transducer is obtained when the measurement angle is i×θ. The corresponding angle energy value Y i , where i is a positive integer.

[0027] Furthermore, the above-mentioned sound field distribution measurement method, obtaining the corresponding coordinate values ​​of the relative sound pressure level and the directional angle of the ultrasonic transducer based on the sound field energy value and the angle energy value, includes:

[0028] The sound field energy value X k The energy value Y i When the sound field energy value X is compared k The energy value Y at the angle i With Y i+1 When the sound field energy value X is obtained k The corresponding pointing angle is and between;

[0029] Calculate the value of n according to the following formula:

[0030]

[0031] The sound field energy value X is calculated according to the following formula k The corresponding pointing angle for:

[0032]

[0033] Based on the relative sound pressure level SPL k With the sound field energy value X k The corresponding relationship is through the sound field energy value Xk Get the relative sound pressure level SPL k With the pointing angle The corresponding coordinate value is

[0034] Furthermore, the above-mentioned sound field distribution measurement method, drawing a sound field distribution pattern based on the corresponding coordinate values ​​of the relative sound pressure level and the directional angle, includes:

[0035] Plot the relative sound pressure level SPL k The contour lines of

[0036] Based on the relative sound pressure level SPL k With the pointing angle The corresponding coordinate values ​​of The relative sound pressure level SPL k Mark the coordinate data points on the contour lines;

[0037] The coordinate data points are connected by data fitting to obtain the sound field distribution pattern of the ultrasonic transducer.

[0038] A second aspect of the present invention provides a device for measuring the sound field distribution of an ultrasonic transducer. The device measures the sound field distribution of an ultrasonic transducer using the sound field distribution measurement method according to the first aspect. The device comprises:

[0039] A transmitting end, used for installing the ultrasonic transducer to be tested and stimulating the ultrasonic transducer to be tested to transmit an ultrasonic signal;

[0040] A receiving end, used to install a receiving ultrasonic transducer and receive the ultrasonic signal;

[0041] A distance control mechanism, used to control the measurement distance of the receiving end;

[0042] The rotation control mechanism is used to control the measuring angle of the receiving end.

[0043] Furthermore, the method for using the above-mentioned sound field distribution measurement device comprises the following steps:

[0044] Placing the transmitting end and the receiving end on the same horizontal axis, and setting the measuring distance between the transmitting end and the receiving end to be r;

[0045] At a position where the measurement angle is 0°, data of the receiving end is collected and recorded as (0°, X0) and (0dB, X0);

[0046] Starting from a measurement angle of 0°, the measurement angle of the receiving end is adjusted by the rotation control mechanism with θ being 1°, and the data of the receiving end is collected at the same time and recorded as

[0047] Returning the receiving end to a position where the measurement angle is 0°;

[0048] Starting from the measurement distance r, the receiving end is horizontally moved by the distance control mechanism, and the measuring distances are 2r, 4r, 8r, ..., 2 k The data of the receiving end is collected at ×r and recorded as (-6dB, X1), (-12dB, X2), (-18dB, X3) and (-6×kdB, X k );

[0049] Returning the receiving end to a position where the measured distance is r;

[0050] Based on the data collected by the receiving end, a sound field distribution pattern is drawn to analyze the distribution of the sound field of the ultrasonic transducer to be tested.

[0051] According to a third aspect of the present invention, there is provided an electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the method for measuring the sound field distribution of the ultrasonic transducer as described above when executing the computer program.

[0052] The effects provided in the content of the invention are only the effects of the embodiments, not all the effects of the invention. One of the above technical solutions has the following advantages or beneficial effects:

[0053] The present application provides a method and device for measuring the sound field distribution of an ultrasonic transducer. By moving the ultrasonic transducer to change the test distance and rotating the ultrasonic transducer to change the test angle, and combining data mapping and difference processing technology, the relative sound pressure level of the ultrasonic transducer and the corresponding coordinate values ​​of the directional angle are obtained, and then the sound field distribution direction diagram is drawn according to the corresponding coordinate values ​​of the relative sound pressure level and the directional angle to analyze the sound field distribution characteristics of the ultrasonic transducer. The present application can not only obtain the directional angle of the ultrasonic transducer, but also measure the detailed distribution of the sound field energy at the same time, thereby providing more comprehensive and accurate ultrasonic transducer performance data and improving the accuracy of product evaluation and design. In addition, the present application does not require expensive special equipment, but only needs to build a simple test scene to realize automated testing, reducing the test cost and operation complexity. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0055] Figure 1 A schematic diagram of a method for measuring the sound field distribution of an ultrasonic transducer according to an embodiment of the present application;

[0056] Figure 2 for Figure 1 A flowchart of a method for implementing step S140;

[0057] Figure 3 A schematic diagram of relative sound pressure level contours according to an embodiment of the present application;

[0058] Figure 4 Based on Figure 3 A schematic diagram of coordinate data point marking of an embodiment;

[0059] Figure 5 Based on Figure 3 A schematic diagram of a coordinate data fitting connection line of an embodiment;

[0060] Figure 6 A sound field distribution pattern according to an embodiment of the present application;

[0061] Figure 7 The sound field distribution directional diagrams of two products of an embodiment of the present application;

[0062] Figure 8 A schematic diagram of the structure of a sound field distribution measurement device of an ultrasonic transducer according to an embodiment of the present application. DETAILED DESCRIPTION

[0063] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0064] It should be noted that references to "one embodiment", "embodiment", "example embodiment", etc. in this specification refer to the embodiment being described which may include specific features, structures or characteristics, but not every embodiment must include these specific features, structures or characteristics. In addition, such expressions do not refer to the same embodiment. Furthermore, when describing specific features, structures or characteristics in conjunction with an embodiment, whether or not there is an explicit description, it is indicated that incorporating such features, structures or characteristics into other embodiments is within the knowledge of those skilled in the art.

[0065] In the application of ultrasonic transducers, accurate measurement of their sound field characteristics is crucial to optimizing equipment performance. The prior art mainly focuses on measuring the pointing angle of the ultrasonic transducer, that is, the angular range of detecting obstacles, but this method only provides limited information and cannot fully reflect the actual working performance of the ultrasonic transducer. Specifically, although the prior art can detect the emission angle of the ultrasonic transducer, it cannot measure the distribution of the sound field energy, which is far from enough for equipment optimization and performance evaluation in certain application scenarios. For example, in the detection of floor materials of cleaning equipment, the pointing angle of the ultrasonic sensor may be offset due to obstacles or installation errors, resulting in changes in echo energy, which in turn causes misjudgment of the floor material. In this case, a single pointing angle measurement cannot provide enough information to adjust and optimize equipment performance. Therefore, a method is needed to comprehensively obtain sound field energy distribution data. Based on this, the present application proposes a sound field distribution measurement method and a measuring device for an ultrasonic transducer, which can not only measure the pointing angle of the ultrasonic transducer, but also indirectly obtain the sound field energy distribution of the ultrasonic transducer by changing the test distance and rotation angle, and provide strong support for product performance comparison and adjustment in application scenarios requiring sound field analysis.

[0066] refer to Figure 1 , Figure 1 A schematic flow chart of a method for measuring the sound field distribution of an ultrasonic transducer according to an embodiment of the present application is shown, and the method comprises the following steps:

[0067] S110, collecting echo signals at different distances by moving the ultrasonic transducer, and calculating sound field energy values ​​corresponding to the relative sound pressure levels of the ultrasonic transducer based on the echo signals at different distances;

[0068] S120, collecting echo signals at different angles by rotating the ultrasonic transducer, and calculating angle energy values ​​corresponding to the directional angle of the ultrasonic transducer based on the echo signals at different angles;

[0069] S130, obtaining the corresponding coordinate values ​​of the relative sound pressure level and the directional angle of the ultrasonic transducer based on the sound field energy value and the angle energy value;

[0070] S140. Based on the corresponding coordinate values ​​of the relative sound pressure level and the directional angle, a sound field distribution pattern is drawn to analyze the sound field distribution characteristics of the ultrasonic transducer.

[0071] The solution of this embodiment, by changing the measurement distance and rotation angle, combined with data mapping and difference processing technology, can not only obtain the pointing angle of the ultrasonic transducer, but also simultaneously measure the detailed distribution of the sound field energy, thereby providing more comprehensive and accurate ultrasonic transducer performance data, improving the accuracy of product evaluation and design, and enhancing the compatibility and adaptability of the product in different application scenarios. In addition, compared with the prior art, this solution does not require expensive special equipment, and only needs to build a simple test scene to achieve automated testing, reducing the test cost and complexity of operation.

[0072] In some embodiments, the echo signal acquisition method at different distances in the above step S110 is the average method. The average method uses the average value of the total energy as output, and its value corresponds to the sound field energy of the ultrasonic transducer. When the measurement distance is r, the sound field energy value of the ultrasonic transducer is:

[0073] X0=(x1+x2+x3+……x N ) / N (1),

[0074] Where N is the number of sampling points within the measurement distance r, x N is the sound field energy value of the Nth sampling point, and X0 is the average value of the sound field energy values ​​of the N sampling points within the measurement distance r.

[0075] In this scheme, the method of achieving the equivalent characterization of relative sound pressure level by changing the test distance is based on the inverse square law, that is, as the propagation distance increases, the sound pressure level is inversely proportional to the square of the distance, which is specifically manifested as the distance doubles and the sound pressure level attenuates by 6dB. Therefore, by testing at different distances, the change in the sound pressure level of the ultrasonic transducer can be indirectly characterized. Specifically, in this step, based on the echo signals at different distances, the sound field energy value corresponding to the relative sound pressure level of the ultrasonic transducer is calculated, including:

[0076] According to the calculation formula of sound pressure level, when the measuring distance is r, the sound pressure level of the ultrasonic transducer is:

[0077]

[0078] Among them, P ref =20μPa represents the reference sound pressure, P represents the sound pressure, and the sound pressure P is calculated by the following formula:

[0079]

[0080] Where ρ is the air density, S d is the vibration area of ​​the ultrasonic transducer, a is the vibration acceleration;

[0081] Based on the above test principle, the measured distances are 2k ×r, the relative sound pressure level SPL of the ultrasonic transducer k Harmony field energy value X k , get the relative sound pressure level SPL k and the sound field energy value X k For example, in one embodiment, when k is 0, 1, 2, 3, 4, and the measurement distances are r, 2r, 4r, 8r, and 16r, respectively, the relative sound pressure level SPL k and the sound field energy value X k The corresponding relationship is shown in Table 1 below:

[0082] Table 1

[0083] Measuring distance Relative sound pressure level Sound field energy value r 0dB <![CDATA[X0]]> 2r -6dB <![CDATA[X1]]> 4r -12dB <![CDATA[X2]]> 8r -18dB <![CDATA[X3]]> 16r -24dB <![CDATA[X4]]>

[0084] In some embodiments, the echo signal acquisition method at different angles in the above step S120 is also the average value method. When the measurement angle is θ, the angle energy value of the ultrasonic transducer is:

[0085] Y1 = (y1 + y2 + y3 + ... y M ) / M (4),

[0086] Where M is the number of sampling points within the measurement angle θ, y M is the angular energy value of the Mth sampling point, and Y1 is the average angular energy value of the M sampling points within the measurement angle θ.

[0087] In this step, based on the echo signals at different angles, the angle energy value corresponding to the directional angle of the ultrasonic transducer is calculated, including: obtaining the directional angle of the ultrasonic transducer when the measurement angle is i×θ respectively. i The corresponding angle energy value Y i , where i is a positive integer. For example, in one embodiment, when θ is 1° and i is 1 to 10, the pointing angle The corresponding angle energy value Y i As shown in Table 2 below:

[0088] Table 2

[0089] Pointing Angle Angle Energy Value 0° <![CDATA[X0]]> 1° <![CDATA[Y1]]> 2° <![CDATA[Y2]]> 3° <![CDATA[Y3]]> 4° <![CDATA[Y4]]> 5° <![CDATA[Y5]]> 6° <![CDATA[Y6]]> 7° <![CDATA[Y7]]> 8° <![CDATA[Y8]]> 9° <![CDATA[Y9]]> 10° <![CDATA[Y 10 ]]>

[0090] In some embodiments, in the above step S130, based on the sound field energy value and the angle energy value, the corresponding coordinate values ​​of the relative sound pressure level and the directional angle of the ultrasonic transducer are obtained, including:

[0091] The sound field energy value X in Table 1 k Compared with the angle energy value Y in Table 2 i For comparison, when the sound field energy value Xk At angle energy value Y i With Y i+1 When the sound field energy value X is obtained k The corresponding pointing angle is and between;

[0092] Calculate the value of n according to the following formula:

[0093]

[0094] Calculate the sound field energy value X according to the following formula k The corresponding pointing angle for:

[0095]

[0096] Based on relative sound pressure level SPL k and the sound field energy value X k The corresponding relationship is obtained by using the sound field energy value X k Get the relative sound pressure level SPL k With pointing angle The corresponding coordinate value is For example, (0dB, 0°),

[0097] That is, in this step, by combining data mapping with linear interpolation, the sound field energy value X k Mapped to angle energy value Y i With Y i+1 Then the sound field energy value X is calculated by linear interpolation method. k The corresponding pointing angle Then, the sound field energy value X k As the intermediate variable, the relative sound pressure level SPL is obtained k With pointing angle This method can not only accurately reflect the corresponding relationship between the relative sound pressure level and the directivity angle, but also achieve more detailed result analysis with less measurement data, thus improving the efficiency and accuracy of the measurement.

[0098] refer to Figure 2 In some embodiments, the step S140 of drawing a sound field distribution pattern based on the corresponding coordinate values ​​of the relative sound pressure level and the directional angle includes:

[0099] S141. Plotting relative sound pressure level (SPL) k Reference Figure 3 , which is a schematic diagram of relative sound pressure level contours of an embodiment;

[0100] S142, based on relative sound pressure level SPL k With pointing angle The corresponding coordinate values ​​of In relative sound pressure level SPL k Mark the coordinate data points on the contour lines. Figure 4 As shown, based on Figure 3 A schematic diagram of coordinate data point marking of an embodiment;

[0101] S143, fitting and connecting the coordinate data points to obtain the sound field distribution pattern of the ultrasonic transducer. Figure 5 As shown, based on Figure 3 A schematic diagram of a coordinate data fitting connection line of an embodiment.

[0102] It can be seen that step S140 can draw a sound field distribution direction diagram by drawing relative sound pressure level contour lines, marking coordinate data points, and performing data fitting and connection, so as to show the sound field distribution characteristics of the ultrasonic transducer. Figure 6 As shown, it is a sound field distribution directional diagram of an embodiment, which can clearly show the directional angle of the ultrasonic transducer and the sound field energy distribution.

[0103] Based on the sound field distribution measurement method in the above embodiment, refer to Figure 7 , Figure 7 The sound field distribution directional diagram of two products of an embodiment is shown, which shows the directional angle and sound field energy distribution of the two products. It can be seen from the figure that although the directional angles of the main lobes of the sound beams of the two products are the same, there are significant differences in the middle area of ​​0°, and this difference is not covered by the prior art. The present application scheme can reveal the performance differences of ultrasonic transducers in details, thereby providing a more comprehensive performance evaluation and optimization direction. In addition, by comparing the differences in directional angles and sound field energy distribution of different products, the present application scheme can find a more optimized product design method; and by analyzing the test results, it can evaluate the impact of different process methods on product performance and help improve the production process; at the same time, it can screen and formulate product standards to provide data support for product quality control.

[0104] refer to Figure 8 The present application also provides a device for measuring the sound field distribution of an ultrasonic transducer. The device uses the sound field distribution measurement method in the above embodiment to measure the sound field distribution of an ultrasonic transducer, including:

[0105] The transmitting end 100 is used to install the ultrasonic transducer to be tested and stimulate the ultrasonic transducer to be tested to transmit an ultrasonic signal;

[0106] The receiving end 200 is used to install a receiving ultrasonic transducer and receive ultrasonic signals;

[0107] The distance control mechanism 300 is used to control the measurement distance of the receiving end 200;

[0108] The rotation control mechanism 400 is used to control the measuring angle of the receiving end 200 .

[0109] Specifically, the method for using the sound field distribution measurement device of this embodiment includes the following steps:

[0110] The transmitting end 100 and the receiving end 200 are placed on the same horizontal axis, and the measuring distance between the transmitting end 100 and the receiving end 200 is r;

[0111] At the position where the measurement angle is 0°, data of the receiving end 200 is collected and recorded as (0°, X0) and (0dB, X0);

[0112] Starting from a measurement angle of 0°, the measurement angle of the receiving end 200 is adjusted by rotating the control mechanism 400 with θ being 1°, and data of the receiving end 200 is collected at the same time and recorded as

[0113] Return the receiving end to the position where the measurement angle is 0°;

[0114] Starting from the measurement distance r, the receiving end 200 is moved horizontally by the distance control mechanism 300, and the measuring distances are 2r, 4r, 8r, ..., 2 k ×r, the data of the receiving end 200 is collected and recorded as (-6dB, X1), (-12dB, X2), (-18dB, X3) and (-6×kdB, X k );

[0115] Return the receiving end 200 to the position where the measured distance is r;

[0116] Based on the data collected by the receiving end 200, a sound field distribution pattern is drawn to analyze the distribution characteristics of the sound field.

[0117] In other embodiments, the receiving end 200 can also be set as an obstacle, and the ultrasonic transducer of the transmitting end 100 adopts an integrated transceiver setting. The above steps can also be used to obtain corresponding test data and draw the sound field radiation pattern of the ultrasonic transducer. The present application is not limited to this.

[0118] Regarding the working principle and working process that are not described in detail in the sound field distribution measurement device of the ultrasonic transducer in this embodiment, reference can be made to the relevant parts in the above-mentioned sound field distribution measurement method embodiment of the ultrasonic transducer, and no further details will be given here.

[0119] The embodiment of the present application also provides an electronic device, which includes an input unit, a memory, a processor, and an output unit. The memory stores program instructions that can be run on the processor, and the processor calls the program instructions to execute the methods and / or technical solutions based on the aforementioned multiple embodiments. For the processes not described in detail in the electronic device in this embodiment, reference can be made to the relevant parts of the above-mentioned method for measuring the sound field distribution of the ultrasonic transducer, which will not be repeated here.

[0120] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A method for measuring the sound field distribution of an ultrasonic transducer, characterized in that: The following steps are involved: The ultrasonic transducer is moved to collect echo signals at different distances, and based on the echo signals at different distances, a sound field energy value corresponding to a relative sound pressure level of the ultrasonic transducer is calculated; The ultrasonic transducer is rotated to collect echo signals at different angles, and based on the echo signals at different angles, an angle energy value corresponding to the directional angle of the ultrasonic transducer is calculated; Based on the sound field energy value and the angle energy value, obtaining the corresponding coordinate values ​​of the relative sound pressure level and the directional angle of the ultrasonic transducer; Based on the corresponding coordinate values ​​of the relative sound pressure level and the directional angle, a sound field distribution direction diagram is drawn to analyze the sound field distribution of the ultrasonic transducer.

2. The method for measuring sound field distribution according to claim 1, characterized in that: The acquisition method of the echo signal at different distances is the average value method. When the measuring distance is r, the sound field energy value of the ultrasonic transducer is: X0=(x1+x2+x3+……x N ) / N (1), Where N is the number of sampling points within the measurement distance r, x N is the sound field energy value of the Nth sampling point, and X0 is the average value of the sound field energy values ​​of the N sampling points within the measurement distance r.

3. The method for measuring sound field distribution according to claim 2, characterized in that: The method of calculating the sound field energy value corresponding to the relative sound pressure level of the ultrasonic transducer based on the echo signals at different distances includes: According to the calculation formula of sound pressure level, when the measuring distance is r, the sound pressure level of the ultrasonic transducer is: Among them, P ref =20μPa represents the reference sound pressure, P represents the sound pressure, and the sound pressure P is calculated by the following formula: Where ρ is the air density, S d is the vibration area of ​​the ultrasonic transducer, a is the vibration acceleration; Based on the inverse square law, the measured distances are 2 k ×r, the relative sound pressure level SPL of the ultrasonic transducer k Harmony field energy value X k , get the relative sound pressure level SPL k With the sound field energy value X k , where k is an integer.

4. The method for measuring sound field distribution according to claim 3, characterized in that: The acquisition method of the echo signal at different angles is the average value method. When the measurement angle is θ, the angle energy value of the ultrasonic transducer is: <h2 style=";text-align:left;direction:ltr">Y1 = (y1 + y2 + y3 +……y)<h2 style=";text-align:left;direction:ltr"> M <h2 style=";text-align:left;direction:ltr"> ) / M (4), Where M is the number of sampling points within the measurement angle θ, y M is the angular energy value of the Mth sampling point, and Y1 is the average angular energy value of the M sampling points within the measurement angle θ.

5. The method for measuring sound field distribution according to claim 4, characterized in that: The method of calculating the angle energy value corresponding to the directional angle of the ultrasonic transducer based on the echo signals at different angles includes: The pointing angle of the ultrasonic transducer is obtained when the measurement angle is i×θ. The corresponding angle energy value Y i , where i is a positive integer.

6. The method for measuring sound field distribution according to claim 5, characterized in that: The obtaining, based on the sound field energy value and the angle energy value, the corresponding coordinate values ​​of the relative sound pressure level and the directional angle of the ultrasonic transducer comprises: The sound field energy value X k The energy value Y i When the sound field energy value X is compared k The energy value Y at the angle i With Y i+1 When the sound field energy value X is obtained k The corresponding pointing angle is and between; Calculate the value of n according to the following formula: The sound field energy value X is calculated according to the following formula k The corresponding pointing angle for: Based on the relative sound pressure level SPL k With the sound field energy value X k The corresponding relationship is through the sound field energy value X k Get the relative sound pressure level SPL k With the pointing angle The corresponding coordinate value is (SPL k , ).

7. The method for measuring sound field distribution according to claim 6, characterized in that: The step of drawing a sound field distribution pattern based on the corresponding coordinate values ​​of the relative sound pressure level and the directional angle comprises: Plot the relative sound pressure level SPL k The contour lines of Based on the relative sound pressure level SPL k With the pointing angle The corresponding coordinate value (SPL k , ), at the relative sound pressure level SPL k Mark the coordinate data points on the contour lines; The coordinate data points are connected by data fitting to obtain the sound field distribution pattern of the ultrasonic transducer.

8. A device for measuring the sound field distribution of an ultrasonic transducer, characterized in that: The sound field distribution of an ultrasonic transducer is measured by using the sound field distribution measurement method according to any one of claims 1 to 7, wherein the sound field distribution measurement device comprises: A transmitting end, used for installing the ultrasonic transducer to be tested and stimulating the ultrasonic transducer to be tested to transmit an ultrasonic signal; A receiving end, used to install a receiving ultrasonic transducer and receive the ultrasonic signal; A distance control mechanism, used to control the measurement distance of the receiving end; The rotation control mechanism is used to control the measuring angle of the receiving end.

9. A method for using the sound field distribution measuring device according to claim 8, characterized in that: The following steps are involved: Placing the transmitting end and the receiving end on the same horizontal axis, and setting the measuring distance between the transmitting end and the receiving end to be r; At a position where the measurement angle is 0°, data of the receiving end is collected and recorded as (0°, X0) and (0dB, X0); Starting from a measurement angle of 0°, the measurement angle of the receiving end is adjusted by the rotation control mechanism with θ being 1°, and data of the receiving end is collected at the same time and recorded as (1°, Y1), (2°, Y2), (3°, Y3), ..., ( Y i ); Returning the receiving end to a position where the measurement angle is 0°; Starting from the measurement distance r, the receiving end is horizontally moved by the distance control mechanism, and the measuring distances are 2r, 4r, 8r, ..., 2 k The data of the receiving end is collected at ×r and recorded as (-6dB, X1), (-12dB, X2), (-18dB, X3) and (-6×kdB, X k ); Returning the receiving end to a position where the measured distance is r; Based on the data collected by the receiving end, a sound field distribution pattern is drawn to analyze the distribution of the sound field of the ultrasonic transducer to be tested.

10. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the method for measuring the sound field distribution of the ultrasonic transducer according to any one of claims 1 to 7 is implemented.

Images