A method and apparatus for measuring the reception rate of ultrasonic sound pressure

Abstract

The application relates to the technical field of ultrasonic sound field measurement, and discloses a kind of measurement method and device of ultrasonic sound pressure receiving rate, method includes: obtaining the first echo wave height value of the echo reflected by the bottom surface of flat-bottom hole corresponding to preset sound beam diffusion angle and preset sound path, setting the second echo wave height value of the echo reflected by the bottom surface of ultrasonic receiving probe flat-bottom hole and the wave height value of longitudinal wave received by ultrasonic receiving probe, the transmission wave height value of contact interface is calculated according to the difference of wave height value, the sound pressure transmission rate of contact interface is calculated simultaneously, then the actual wave height value of the radiation sound path at flat-bottom hole is calculated, and the ultrasonic sound pressure receiving rate at this place is calculated according to actual wave height value and received longitudinal wave height value.The application replaces ultrasonic sound pressure with ultrasonic wave height value to calculate the sound pressure receiving rate of ultrasonic receiving probe, corrects the ultrasonic sound pressure directly measured by ultrasonic receiving probe, can obtain the real sound pressure value of ultrasonic longitudinal wave radiation sound field at specific sound path and specific diffusion angle, and improves the measurement precision of ultrasonic sound pressure.

Description

A method and apparatus for measuring ultrasonic sound pressure reception rate Technical Field

[0001] This invention relates to the field of ultrasonic sound field measurement technology, and specifically to a method and apparatus for measuring ultrasonic sound pressure reception rate. Background Technology

[0002] In the measurement of sound pressure in ultrasonic sound fields, the existing technology uses a series of semi-cylindrical test blocks of different diameters. By coupling an ultrasonic longitudinal wave probe to the center of the large plane of the test block, and setting a receiving probe and device on the cylindrical surface of the test block, the receiving probe is rotated along the cylindrical surface, thereby measuring the sound pressure distribution of the ultrasonic sound field at different ultrasonic longitudinal wave probe sound field diffusion angles and propagation distances.

[0003] However, the sound pressure value of the ultrasonic field obtained by the receiving probe is affected by factors such as the transmittance of the test block / ultrasonic receiving probe interface and the sound pressure conversion rate of the ultrasonic receiving probe crystal. The sound pressure measured by the ultrasonic receiving probe is not the radiated sound pressure of the ultrasonic longitudinal wave probe at this location, which leads to inaccurate ultrasonic sound pressure measurement. Summary of the Invention

[0004] In view of this, the present invention provides a method and apparatus for measuring ultrasonic sound pressure reception rate to solve the problem of inaccurate ultrasonic sound pressure measurement.

[0005] In a first aspect, the present invention provides a method for measuring ultrasonic sound pressure reception rate, the method comprising:

[0006] The ultrasonic longitudinal wave is emitted to the cylindrical surface of the semi-cylindrical test block by exciting the ultrasonic longitudinal wave probe with an ultrasonic detector, and the first echo wave height value of the echo reflected from the bottom surface of the flat hole corresponding to the preset sound beam diffusion angle and preset sound path is obtained.

[0007] The ultrasonic longitudinal wave is emitted to the cylindrical surface of the semi-cylindrical test block by exciting the ultrasonic longitudinal wave probe with an ultrasonic detector, and the second echo wave height value of the echo reflected by the bottom surface of the flat bottom hole of the ultrasonic receiving probe, which corresponds to the preset sound beam diffusion angle and preset sound path, is obtained, and the received longitudinal wave height value of the ultrasonic receiving probe is obtained.

[0008] The transmitted wave height value at the interface between the flat bottom hole of the semi-cylindrical test block and the ultrasonic receiving probe is obtained based on the difference between the first echo wave height value and the second echo wave height value. At the same time, the acoustic pressure transmittance of the interface is calculated.

[0009] The actual wave height of the radiated sound field at the flat-bottomed hole is calculated based on the transmitted wave height and the sound pressure transmittance. The ultrasonic sound pressure receiveance at the flat-bottomed hole is then calculated based on the actual wave height and the received longitudinal wave height of the ultrasonic receiving probe.

[0010] The ultrasonic sound pressure receiving rate measurement method provided in this invention first uses an ultrasonic detector to excite an ultrasonic longitudinal wave probe to emit ultrasonic longitudinal waves onto the cylindrical surface of a semi-cylindrical test block. The method sequentially acquires the first echo height value of the echo reflected from the bottom surface of the flat-bottomed hole corresponding to a preset sound beam diffusion angle and preset sound path, the second echo height value of the echo reflected from the bottom surface of the flat-bottomed hole where the ultrasonic receiving probe is located, and the wave height value of the ultrasonic longitudinal wave received by the ultrasonic receiving probe. Next, the transmitted wave height value and sound pressure transmittance at the contact interface between the semi-cylindrical test block and the ultrasonic receiving probe are calculated. Finally, the actual wave height value at the contact interface is calculated, and the ultrasonic sound pressure receiving rate is calculated based on the actual wave height value and the received longitudinal wave height value of the ultrasonic receiving probe. This invention uses the ultrasonic wave height value instead of the ultrasonic sound pressure to calculate the sound pressure receiving rate of the ultrasonic receiving probe, correcting the directly measured ultrasonic sound pressure. This allows for the acquisition of the true sound pressure value of the radiated sound field of the ultrasonic longitudinal wave at a specific sound path and diffusion angle, improving the measurement accuracy of ultrasonic sound pressure.

[0011] In one optional implementation, a preset acoustic beam diffusion angle is used to characterize the angle between the line connecting the center of the bottom surface of the flat-bottom hole and the center of the ultrasonic longitudinal wave probe and the main acoustic beam axis of the ultrasonic longitudinal wave probe; a preset acoustic path is used to characterize the difference between the radius of the cylindrical surface of the semi-cylindrical test block and the depth of the flat-bottom hole.

[0012] This invention couples an ultrasonic receiving probe into different flat-bottomed holes in a semi-cylindrical test block, enabling the acquisition of ultrasonic sound pressure reception rates at different sound beam diffusion angles and sound paths. This allows for the measurement of the true sound pressure of the radiated sound field at specific sound paths and diffusion angles of the ultrasonic longitudinal wave probe, thus revealing the true distribution of sound pressure in the sound field.

[0013] In one alternative implementation, the first echo height value, the second echo height value, and the received longitudinal wave height value of the ultrasonic receiving probe are set to be acquired at the same gain.

[0014] The ultrasonic sound pressure receiver rate to be measured in this invention is a dimensionless coefficient. Therefore, the received longitudinal wave height value and ultrasonic echo height value under the same gain, which are relatively easy to measure, are selected to replace the ultrasonic sound pressure for calculation. This simplifies the measurement process and ensures the reliability of the ultrasonic sound pressure receiver rate calculation.

[0015] In one optional embodiment, the calculation process of the acoustic pressure transmittance at the contact interface includes: obtaining the acoustic impedance of the semi-cylindrical test block and the acoustic impedance of the protective film of the ultrasonic receiving probe; and calculating the acoustic pressure transmittance at the contact interface between the semi-cylindrical test block and the ultrasonic receiving probe based on the two impedances, as shown in the following formula:

[0016]

[0017] Where T is the sound pressure transmittance, Z1 is the acoustic impedance of the semi-cylindrical test block, and Z2 is the acoustic impedance of the protective film of the ultrasonic receiving probe.

[0018] This invention takes into account that the material properties of the test block and the ultrasonic receiving probe will affect the measurement of ultrasonic sound pressure. Therefore, the inherent characteristic of acoustic impedance is introduced into the calculation process of generating sound pressure reception rate, that is, the sound pressure transmission rate of the contact interface between the semi-cylindrical test block and the ultrasonic receiving probe is calculated, so as to know the actual transmission of ultrasonic sound pressure.

[0019] In one alternative implementation, the formula for calculating the actual wave height of the radiated sound field at the flat-bottomed hole is:

[0020]

[0021] Among them, H real The actual wave height is ΔH = H. fbh0 -H fbhp H represents the transmitted wave height at the interface between the flat-bottomed hole of the semi-cylindrical specimen and the ultrasonic receiving probe. fbh0 H represents the wave height of the first echo. fbhp This is the wave height value of the second echo.

[0022] This invention takes into account that the ultrasonic sound pressure receiving rate to be calculated is a dimensionless constant, and that the ultrasonic sound pressure is proportional to the ultrasonic height value. In order to simplify the measurement process, the ultrasonic height value is used instead of the ultrasonic sound pressure for calculation, so that the true wave height value at this point can be calculated based on the ultrasonic height value transmitted through the contact interface.

[0023] In one optional implementation, the formula for calculating the ultrasonic sound pressure reception rate at the flat-bottomed hole is:

[0024]

[0025] Where η is the ultrasonic sound pressure transmission rate, and H rcv This represents the received longitudinal wave height value of the ultrasonic receiving probe.

[0026] This invention uses the wave height value and the actual ultrasonic wave height value obtained by the ultrasonic receiving probe to replace the ultrasonic sound pressure and the actual sound pressure value received by the ultrasonic receiving probe at this location. This allows the ultrasonic sound pressure receiving rate of the receiving probe to be obtained. Thus, after the sound pressure at a certain location is obtained by normal measurement through the ultrasonic receiving probe, dividing by the ultrasonic sound pressure receiving rate can obtain the actual sound pressure at any position of the receiving probe in the sound field, thereby improving the accuracy of sound pressure measurement.

[0027] Secondly, the present invention provides a device for measuring ultrasonic sound pressure reception rate, the device comprising: an ultrasonic detector, an ultrasonic longitudinal wave probe, an ultrasonic receiving probe, and a semi-cylindrical test block containing a predetermined number of flat-bottomed holes.

[0028] An ultrasonic testing instrument is used to excite an ultrasonic longitudinal wave probe to generate an ultrasonic longitudinal wave of a preset frequency, and to measure the wave height of the echo received by the ultrasonic longitudinal wave probe and the wave height of the longitudinal wave received by the ultrasonic receiving probe.

[0029] An ultrasonic longitudinal wave probe is used to couple to the center of the rectangular surface of a semi-cylindrical test block. It generates and emits ultrasonic longitudinal waves by being excited by an ultrasonic detector, and receives the echo of the ultrasonic longitudinal waves and returns it to the ultrasonic detector.

[0030] An ultrasonic receiving probe is used to couple to the bottom surface of the flat-bottomed hole on the cylindrical surface of the semi-cylindrical test block to receive ultrasonic longitudinal waves and return them to the ultrasonic testing instrument.

[0031] The semi-cylindrical test block has a preset number of flat-bottomed holes on its cylindrical surface according to preset processing conditions. These holes are used to couple an ultrasonic receiving probe to receive the ultrasonic longitudinal wave emitted by the ultrasonic longitudinal wave probe, and to form the echo received by the ultrasonic longitudinal wave probe on the bottom surface of the flat-bottomed hole.

[0032] The ultrasonic sound pressure receiving rate measurement device provided in this invention involves setting a predetermined number of flat-bottomed holes on the cylindrical surface of a semi-cylindrical test block according to preset processing conditions. An ultrasonic detector excites an ultrasonic longitudinal wave probe coupled to the rectangular surface of the semi-cylindrical test block to generate and emit ultrasonic longitudinal waves to the cylindrical surface of the semi-cylindrical test block. An ultrasonic receiving probe coupled within the flat-bottomed holes of the semi-cylindrical test block receives the ultrasonic longitudinal waves, and the ultrasonic longitudinal wave probe receives the ultrasonic echo reflected from the bottom surface of the flat-bottomed holes. The ultrasonic sound pressure receiving rate is calculated based on the received longitudinal wave height value and the ultrasonic echo height value measured by the ultrasonic detector. This invention uses the ultrasonic wave height value instead of the ultrasonic sound pressure to calculate the sound pressure receiving rate of the ultrasonic receiving probe, correcting the directly measured ultrasonic sound pressure. This allows for the acquisition of the true sound pressure value of the radiated sound field of the ultrasonic longitudinal wave at a specific sound path and a specific diffusion angle, improving the measurement accuracy of ultrasonic sound pressure.

[0033] In one alternative embodiment, the ultrasonic receiving probe is configured as a piezoelectric crystal ultrasonic probe that vibrates in the thickness direction.

[0034] This invention improves the sensitivity of ultrasonic detection by selecting a piezoelectric crystal ultrasonic probe as the type of ultrasonic receiving probe.

[0035] In one alternative implementation, the cylindrical height of the semi-cylindrical specimen is set according to the ultrasonic sound field.

[0036] In designing the semi-cylindrical test block, this invention sets the cylindrical height of the semi-cylindrical test block according to the range of the ultrasonic sound field, thereby avoiding the influence of the test block boundary on the ultrasonic sound field.

[0037] In one optional embodiment, preset processing conditions include: the flat-bottomed hole is rotated on the cylindrical surface of the semi-cylindrical test block at a preset interval, with different rotation positions corresponding to different preset sound beam diffusion angles; the flat-bottomed hole is perpendicular to the cylindrical surface of the semi-cylindrical test block and is set to a preset depth, with different preset depths corresponding to different preset sound paths; the shape and size of the bottom surface of the flat-bottomed hole are the same as the shape and size of the coupling surface of the ultrasonic receiving probe; and the longitudinal section of the flat-bottomed hole is set to an isosceles trapezoid.

[0038] This invention manufactures a semi-cylindrical test block with a flat-bottomed hole for coupling an ultrasonic receiving probe. By comparing the ultrasonic longitudinal wave echo height values ​​when the ultrasonic receiving probe is not coupled to the bottom surface of the flat-bottomed hole with those when coupled, the actual transmitted ultrasonic sound pressure at the corresponding sound path and diffusion angle of the ultrasonic receiving probe at the bottom surface of the flat-bottomed hole can be obtained. To facilitate coupling of the ultrasonic receiving probe at the bottom surface of the flat-bottomed hole, the shape and size of the bottom surface of the flat-bottomed hole must be consistent with the coupling surface of the receiving probe, and its longitudinal section is set as an isosceles trapezoid. Furthermore, rotating the block at preset intervals ensures different beam diffusion angles, and setting it to a preset depth ensures different sound paths, thereby obtaining the ultrasonic sound pressure reception rate of the ultrasonic receiving probe at different sound paths and radiation angles, improving the accuracy of ultrasonic sound pressure measurement at different sound paths and radiation angles. Attached Figure Description

[0039] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0040] Figure 1 is a flowchart illustrating a method for measuring ultrasonic sound pressure reception rate according to an embodiment of the present invention;

[0041] Figure 2 is an axial view of a semi-cylindrical test block without an ultrasonic receiving probe in the method for measuring ultrasonic sound pressure reception rate according to an embodiment of the present invention.

[0042] Figure 3 is a side view of a semi-cylindrical test block without an ultrasonic receiving probe in the method for measuring ultrasonic sound pressure reception rate according to an embodiment of the present invention.

[0043] Figure 4 is an axial view of a semi-cylindrical test block with an ultrasonic receiving probe in a method for measuring ultrasonic sound pressure reception rate according to an embodiment of the present invention.

[0044] Figure 5 is a side view of a semi-cylindrical test block with an ultrasonic receiving probe in a method for measuring ultrasonic sound pressure reception rate according to an embodiment of the present invention.

[0045] Figure 6 is a three-view diagram of a semi-cylindrical test block with an ultrasonic receiving probe for measuring ultrasonic sound pressure reception rate according to an embodiment of the present invention.

[0046] Attached image description:

[0047] 1-Ultrasonic testing instrument; 2-Ultrasonic longitudinal wave probe; 3-Semi-cylindrical test block; 301-Flat bottom hole; 4-Ultrasonic receiving probe. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] The embodiments of the present invention are applicable to scenarios in which ultrasonic sound pressure is accurately measured in an ultrasonic sound field to obtain the sound pressure distribution of the ultrasonic sound field.

[0050] This invention provides a method for measuring ultrasonic sound pressure reception rate. By measuring the ultrasonic sound pressure reception rate of an ultrasonic receiving probe, the ultrasonic sound pressure obtained by direct measurement is corrected, thereby achieving the effect of accurate measurement of ultrasonic sound pressure.

[0051] According to an embodiment of the present invention, an embodiment of a method for measuring ultrasonic sound pressure reception rate is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0052] This embodiment provides a method for measuring ultrasonic sound pressure reception rate, which can be used in the aforementioned mobile terminal, such as a computer. Figure 1 is a flowchart of the method for measuring ultrasonic sound pressure reception rate according to an embodiment of the present invention. As shown in Figure 1, the process includes the following steps:

[0053] Step S101: The ultrasonic longitudinal wave probe is excited by the ultrasonic detector to emit the ultrasonic longitudinal wave to the cylindrical surface of the semi-cylindrical test block, and the first echo wave height value of the echo reflected by the bottom surface of the flat hole corresponding to the preset sound beam diffusion angle and preset sound path is obtained.

[0054] Specifically, in this embodiment of the invention, since the ultrasonic sound pressure receiving rate to be calculated is a dimensionless constant, and the ultrasonic sound pressure is proportional to the ultrasonic height, the ultrasonic height is used instead of the ultrasonic sound pressure for calculation. As shown in the axial view of the semi-cylindrical test block in Figure 2 and the side view of the semi-cylindrical test block in Figure 3, the ultrasonic longitudinal wave probe 2 is stably coupled to the center of the rectangular surface of the semi-cylindrical test block 3 and connected to the ultrasonic detector 1. The ultrasonic detector 1 excites the ultrasonic longitudinal wave probe 2 to generate ultrasonic longitudinal waves, which are then emitted to the cylindrical surface of the semi-cylindrical test block 3. The ultrasonic longitudinal waves are reflected by the bottom surface of the flat-bottomed holes 301 on the cylindrical surface of the semi-cylindrical test block 3 to form echoes. The ultrasonic longitudinal wave probe 2 receives the ultrasonic echoes reflected from the bottom surfaces of each flat-bottomed hole 301 on the cylindrical surface of the semi-cylindrical test block 3. Each flat-bottomed hole 301 represents an ultrasonic echo with a different preset beam diffusion angle and preset sound path. Specifically, the preset beam diffusion angle represents the angle between the line connecting the center of the bottom surface of the flat-bottomed hole 301 and the center of the ultrasonic longitudinal wave probe 2, and the main beam axis of the ultrasonic longitudinal wave probe 2; the preset sound path represents the difference between the radius of the cylindrical surface of the semi-cylindrical test block 3 and the depth of the flat-bottomed hole 301. The ultrasonic echo is returned to the ultrasonic testing instrument 1, and the ultrasonic testing instrument 1 measures the first echo height value H of the ultrasonic echo. fbh0 .

[0055] Step S102: The ultrasonic longitudinal wave probe is excited by the ultrasonic detector to emit the ultrasonic longitudinal wave to the cylindrical surface of the semi-cylindrical test block, and the second echo wave height value of the echo reflected by the bottom surface of the flat bottom hole of the ultrasonic receiving probe, which corresponds to the preset sound beam diffusion angle and preset sound path, is obtained, and the received longitudinal wave height value of the ultrasonic receiving probe is obtained.

[0056] Specifically, in this embodiment of the invention, as shown in Figure 4 (axial view of the semi-cylindrical test block), Figure 5 (side view of the semi-cylindrical test block), and Figure 6 (three-dimensional view of the semi-cylindrical test block), based on the existing structure, the ultrasonic receiving probe 4 is stably coupled to the center position of the bottom surface of different flat-bottomed holes 301 on the cylindrical surface of the semi-cylindrical test block 3, and the ultrasonic receiving probe 4 is connected to the ultrasonic testing instrument 1. This embodiment of the invention takes the most central flat-bottomed hole 301 as an example, but is not limited thereto. The ultrasonic testing instrument 1 excites the ultrasonic longitudinal wave probe 2 to generate ultrasonic longitudinal waves, which are then emitted to the cylindrical surface of the semi-cylindrical test block 3. The ultrasonic longitudinal waves are reflected by the bottom surface of the flat-bottomed holes 301 on the cylindrical surface of the semi-cylindrical test block 3 to form echoes. The ultrasonic longitudinal wave probe 2 receives the ultrasonic echoes reflected from the bottom surface of the flat-bottomed holes 301 on the cylindrical surface of the semi-cylindrical test block 3 where the ultrasonic receiving probe 4 is located, and returns the ultrasonic echoes to the ultrasonic testing instrument 1. The ultrasonic testing instrument 1 measures the second echo height value H of the ultrasonic echoes. fbhp Simultaneously, the ultrasonic receiving probe 4 receives the longitudinal ultrasonic wave received by the bottom surface of the flat-bottomed hole 301 on the cylindrical surface of the semi-cylindrical test block 3, and returns the longitudinal ultrasonic wave to the ultrasonic testing instrument 1, which measures the received longitudinal wave height H. rcvDuring the measurement process, the first echo height value H must be maintained. fbh0 Second echo wave height value H fbhp and the received longitudinal wave height H rcv Set to acquire at the same gain.

[0057] Step S103: Obtain the transmitted wave height value of the interface between the flat bottom hole of the semi-cylindrical test block and the ultrasonic receiving probe based on the difference between the first echo wave height value and the second echo wave height value, and calculate the sound pressure transmission rate of the interface at the same time.

[0058] Specifically, in this embodiment of the invention, the height value H of the first ultrasonic echo when the ultrasonic receiving probe 4 is not coupled to the bottom surface of the flat-bottomed hole 301 is obtained. fbh0 and the ultrasonic second echo height value H coupled to the bottom surface of the flat-bottomed hole 301 fbhp Then, the height value ΔH of the transmitted wave transmitted from the interface between the flat bottom hole 301 of the semi-cylindrical test block 3 and the ultrasonic receiving probe 4 is obtained by calculating the difference between the two. The formula is as follows:

[0059] ΔH=H fbh0 -H fbhp

[0060] In some optional embodiments, the materials of the semi-cylindrical test block 3 and the ultrasonic receiving probe 4 affect the reception of ultrasonic sound pressure. Therefore, the sound pressure transmittance T at the contact interface is calculated based on the inherent properties of both materials. In this case, the sound pressure transmittance is also equivalent to the high transmittance of ultrasonic waves. The calculation process of the sound pressure transmittance T is as follows:

[0061] Step S1031: Obtain the acoustic impedance of the semi-cylindrical test block 3 and the acoustic impedance of the protective film of the ultrasonic receiving probe 4.

[0062] Step S1032: Calculate the acoustic pressure transmittance at the contact interface between the semi-cylindrical test block 3 and the ultrasonic receiving probe 4 based on the two impedances. The calculation formula is as follows:

[0063]

[0064] Wherein, Z1 is the acoustic impedance of the semi-cylindrical test block 3, and Z2 is the acoustic impedance of the protective film of the ultrasonic receiving probe 4.

[0065] In some alternative implementations, acoustic impedance is an inherent property of the material. Therefore, the acoustic impedance of the semi-cylindrical test block 3 and the protective film of the ultrasonic receiving probe 4 can be obtained by consulting relevant literature. The acoustic pressure transmittance at the interface between the semi-cylindrical test block 3 and the protective film of the ultrasonic receiving probe 4 can then be calculated using existing acoustic pressure transmittance formulas. The actual acoustic pressure value can then be calculated based on the transmitted acoustic pressure. In this embodiment of the invention, since the wave height is proportional to the acoustic pressure, the wave height is used instead of the calculated value.

[0066] Step S104: Calculate the actual wave height of the radiated sound field at the flat-bottomed hole based on the transmitted wave height and sound pressure transmittance, and calculate the ultrasonic sound pressure receiveance at the flat-bottomed hole based on the actual wave height and the received longitudinal wave height of the ultrasonic receiving probe.

[0067] Specifically, in this embodiment of the invention, after obtaining the actual transmitted wave height ΔH at the contact interface between the flat-bottomed hole 301 of the semi-cylindrical test block 3 and the ultrasonic receiving probe 4, and the sound pressure transmittance T at the contact interface, the actual wave height H at this location can be calculated. real That is, the wave height of all untransmitted ultrasonic longitudinal waves, as shown in the formula below:

[0068]

[0069] In some alternative embodiments, the received longitudinal wave height H of the ultrasonic receiving probe 4 can be measured by means of the ultrasonic receiving probe 4 coupled within the flat-bottomed hole 301. rcv Then, the ultrasonic high reception rate, i.e., the ultrasonic sound pressure reception rate η, is calculated based on the actual wave height value here. The calculation formula is as follows:

[0070]

[0071] The ultrasonic sound pressure receiving rate measurement method provided in this embodiment first uses an ultrasonic detector to excite an ultrasonic longitudinal wave probe to emit ultrasonic longitudinal waves onto the cylindrical surface of a semi-cylindrical test block. The method then sequentially acquires the first echo height value of the echo reflected from the bottom surface of the flat-bottomed hole corresponding to a preset sound beam diffusion angle and preset sound path, the second echo height value of the echo reflected from the bottom surface of the flat-bottomed hole where the ultrasonic receiving probe is located, and the wave height value of the ultrasonic longitudinal wave received by the ultrasonic receiving probe. Next, the transmitted wave height value and sound pressure transmittance at the contact interface between the semi-cylindrical test block and the ultrasonic receiving probe are calculated. Finally, the actual wave height value at the contact interface is calculated, and the ultrasonic sound pressure receiving rate is calculated based on the actual wave height value and the received longitudinal wave height value of the ultrasonic receiving probe. This invention uses the ultrasonic wave height value instead of the ultrasonic sound pressure to calculate the sound pressure receiving rate of the ultrasonic receiving probe, correcting the directly measured ultrasonic sound pressure. This allows for the acquisition of the true sound pressure value of the radiated sound field of the ultrasonic longitudinal wave at a specific sound path and diffusion angle, improving the measurement accuracy of ultrasonic sound pressure.

[0072] This embodiment provides a device for measuring ultrasonic sound pressure reception rate, as shown in Figure 6, including: an ultrasonic detector 1, an ultrasonic longitudinal wave probe 2, an ultrasonic receiving probe 4, and a semi-cylindrical test block 3 containing a preset number of flat-bottomed holes 301.

[0073] An ultrasonic testing instrument 1 is used to excite an ultrasonic longitudinal wave probe 2 to generate an ultrasonic longitudinal wave of a preset frequency, and to measure the wave height of the echo received by the ultrasonic longitudinal wave probe 2 and the wave height of the longitudinal wave received by the ultrasonic receiving probe 4.

[0074] The ultrasonic longitudinal wave probe 2 is used to couple to the center of the rectangular surface of the semi-cylindrical test block 3. It generates and emits ultrasonic longitudinal waves by being excited by the ultrasonic detector 1, and receives the echo of the ultrasonic longitudinal wave and returns it to the ultrasonic detector 1.

[0075] The ultrasonic receiving probe 4 is used to couple to the bottom surface of the flat-bottomed hole 301 on the cylindrical surface of the semi-cylindrical test block 3 to receive ultrasonic longitudinal waves and return them to the ultrasonic testing instrument 1.

[0076] The semi-cylindrical test block 3 has a preset number of flat-bottomed holes 301 on its cylindrical surface according to preset processing conditions. These holes are used to couple the ultrasonic receiving probe 4 to receive the ultrasonic longitudinal wave emitted by the ultrasonic longitudinal wave probe, and to form the echo received by the ultrasonic longitudinal wave probe on the bottom surface of the flat-bottomed hole 301.

[0077] Specifically, in this embodiment of the invention, the cylindrical height of the semi-cylindrical test block 3 is set according to the ultrasonic sound field to avoid the boundary of the test block affecting the ultrasonic sound field. The semi-cylindrical test block 3 containing five flat-bottomed holes 301 is fabricated according to preset processing conditions, but is not limited thereto. The preset processing conditions include:

[0078] 1. The flat-bottomed hole 301 is rotated on the cylindrical surface of the semi-cylindrical test block 3 at a preset interval. Different rotation positions correspond to different preset sound beam diffusion angles, as shown in Figure 5. The angle between the line connecting the center of the bottom surface of the flat-bottomed hole 301 and the center of the ultrasonic longitudinal wave probe 2 and the main sound beam axis of the ultrasonic longitudinal wave probe 2 constitutes the preset sound beam diffusion angle.

[0079] 2. The flat-bottomed hole 301 is perpendicular to the cylindrical surface of the semi-cylindrical test block 3 and is set to a preset depth. Different preset depths correspond to different preset sound paths, as shown in Figure 5. The difference between the radius of the cylindrical surface of the semi-cylindrical test block 3 and the depth of the flat-bottomed hole 301 constitutes the preset sound path.

[0080] 3. The shape and size of the bottom surface of the flat-bottomed hole 301 are the same as the shape and size of the coupling surface of the ultrasonic receiving probe 4. In this embodiment of the invention, a piezoelectric crystal ultrasonic probe that vibrates in the thickness direction is selected as the ultrasonic receiving probe 4, and its crystal diameter is 3 mm or smaller. Therefore, the size of the bottom surface of the flat-bottomed hole 301 is also set to 3 mm or smaller, but is not limited thereto.

[0081] 4. The longitudinal section of the flat-bottomed hole 301 is set as an isosceles trapezoid to facilitate the coupling of the ultrasonic receiving probe 4 on the bottom surface of the flat-bottomed hole 301. It can also be set as a shape similar to an isosceles trapezoid, but is not limited to this.

[0082] In some optional embodiments, as shown in Figure 6, the ultrasonic longitudinal wave probe 2 has both ultrasonic transmission and ultrasonic reception functions. It is coupled to the center of the rectangular surface of the semi-cylindrical test block 3 to perform ultrasonic longitudinal wave transmission and ultrasonic echo reception. The ultrasonic receiving probe 4 has ultrasonic reception functions and is coupled to the flat-bottomed hole 301 on the cylindrical surface of the semi-cylindrical test block 3 to receive ultrasonic longitudinal waves. The ultrasonic detector 1 is connected to both the ultrasonic longitudinal wave probe 2 and the ultrasonic receiving probe 4, and can display and extract the ultrasonic echo height value of the ultrasonic longitudinal wave probe 2 and the received longitudinal wave height value of the ultrasonic receiving probe 4, respectively.

[0083] Further functional descriptions of the above-mentioned parts are the same as those in the corresponding embodiments described above, and will not be repeated here.

[0084] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A method for measuring ultrasonic sound pressure reception rate, characterized in that, The method includes: emitting ultrasonic longitudinal waves to the cylindrical surface of a semi-cylindrical test block by exciting an ultrasonic longitudinal wave probe with an ultrasonic detector, and obtaining the first echo height value of the echo reflected from the bottom surface of the flat-bottomed hole corresponding to a preset sound beam diffusion angle and a preset sound path; emitting ultrasonic longitudinal waves to the cylindrical surface of the semi-cylindrical test block by exciting an ultrasonic longitudinal wave probe with an ultrasonic detector, and obtaining the second echo height value of the echo reflected from the bottom surface of the flat-bottomed hole, which is equipped with an ultrasonic receiving probe and corresponds to a preset sound beam diffusion angle and a preset sound path, and obtaining the received longitudinal wave height value of the ultrasonic receiving probe; obtaining the transmitted wave height value at the contact interface between the flat-bottomed hole of the semi-cylindrical test block and the ultrasonic receiving probe based on the difference between the first and second echo height values, and simultaneously calculating the sound pressure transmittance of the contact interface; calculating the actual wave height value of the radiated sound field at the flat-bottomed hole based on the transmitted wave height value and the sound pressure transmittance, and calculating the ultrasonic sound pressure receiving rate at the flat-bottomed hole based on the actual wave height value and the received longitudinal wave height value of the ultrasonic receiving probe.

2. The method according to claim 1, characterized in that, The preset sound beam diffusion angle represents the angle between the line connecting the center of the bottom surface of the flat-bottomed hole and the center of the ultrasonic longitudinal wave probe, and the main sound beam axis of the ultrasonic longitudinal wave probe; the preset sound path represents the difference between the radius of the cylindrical surface of the semi-cylindrical test block and the depth of the flat-bottomed hole.

3. The method according to claim 1, characterized in that, The first echo height value, the second echo height value, and the received longitudinal wave height value of the ultrasonic receiving probe are set to be obtained at the same gain.

4. The method according to claim 1, characterized in that, The calculation process for the acoustic pressure transmittance of the contact interface includes: obtaining the acoustic impedance of the semi-cylindrical test block and the acoustic impedance of the ultrasonic receiving probe protective film; and calculating the acoustic pressure transmittance of the contact interface between the semi-cylindrical test block and the ultrasonic receiving probe based on the two impedances, using the following formula: in, Sound pressure transmittance. Let be the acoustic impedance of the semi-cylindrical test block. The acoustic impedance is the protective film of the ultrasonic receiving probe.

5. The method according to claim 4, characterized in that, The formula for calculating the actual wave height of the radiated sound field at the flat-bottomed hole is as follows: in, This represents the actual wave height. H is the transmitted wave height at the interface between the flat-bottomed hole of the semi-cylindrical test block and the ultrasonic receiving probe. fbh0 H represents the wave height of the first echo. fbhp This is the wave height value of the second echo.

6. The method according to claim 5, characterized in that, The formula for calculating the ultrasonic sound pressure reception rate at the flat-bottomed hole is as follows: in, Ultrasonic sound pressure transmission rate. The received longitudinal wave height value of the ultrasonic receiving probe.

7. A device for measuring ultrasonic sound pressure reception rate, characterized in that, The device includes: an ultrasonic testing instrument, an ultrasonic longitudinal wave probe, an ultrasonic receiving probe, and a semi-cylindrical test block containing a predetermined number of flat-bottomed holes; the ultrasonic testing instrument is used to excite the ultrasonic longitudinal wave probe to generate ultrasonic longitudinal waves of a predetermined frequency, and to measure the wave height of the echo received by the ultrasonic longitudinal wave probe and the wave height of the longitudinal wave received by the ultrasonic receiving probe; the ultrasonic longitudinal wave probe is used to couple to the center position of the rectangular surface of the semi-cylindrical test block, to generate ultrasonic longitudinal waves through excitation by the ultrasonic testing instrument and to emit them to the cylindrical surface of the semi-cylindrical test block, and to receive the waves from the flat bottom of the cylindrical surface of the semi-cylindrical test block. The echo of the ultrasonic longitudinal wave reflected by the bottom surface of the hole and the echo of the ultrasonic longitudinal wave reflected by the bottom surface of the flat-bottomed hole equipped with an ultrasonic receiving probe are returned to the ultrasonic testing instrument; the ultrasonic receiving probe is used to couple to the bottom surface of the flat-bottomed hole on the cylindrical surface of the semi-cylindrical test block, receive the ultrasonic longitudinal wave and return it to the ultrasonic testing instrument; the semi-cylindrical test block has a preset number of flat-bottomed holes on its cylindrical surface according to preset processing conditions, which are used to couple the ultrasonic receiving probe to receive the ultrasonic longitudinal wave emitted by the ultrasonic longitudinal wave probe, and form the echo received by the ultrasonic longitudinal wave probe on the bottom surface of the flat-bottomed hole.

8. The apparatus according to claim 7, characterized in that, The ultrasonic receiving probe is configured as a piezoelectric crystal ultrasonic probe that vibrates in the thickness direction.

9. The apparatus according to claim 7, characterized in that, The cylindrical height of the semi-cylindrical test block is set according to the ultrasonic sound field.

10. The apparatus according to claim 7, characterized in that, The preset processing conditions include: the flat-bottomed hole is rotated on the cylindrical surface of the semi-cylindrical test block at a preset interval, with different rotation positions corresponding to different preset sound beam diffusion angles; the flat-bottomed hole is perpendicular to the cylindrical surface of the semi-cylindrical test block and is set to a preset depth, with different preset depths corresponding to different preset sound paths; the shape and size of the bottom surface of the flat-bottomed hole are the same as the shape and size of the coupling surface of the ultrasonic receiving probe; and the longitudinal section of the flat-bottomed hole is set to an isosceles trapezoid.

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