A sound field measurement method, device and medium

Abstract

The present application discloses a sound field measurement method, device and medium, relating to the technical field of ultrasound, which solves the problem that it takes too long to determine the focus of the focal region in sound field measurement. The present application moves the position of the hydrophone so that the running direction of the hydrophone is parallel to the plane of the treatment head; records the first marking point and the second marking point in the vertical direction when the hydrophone moves to the edge of the plane of the treatment head; obtains the distance and direction to be moved in the vertical direction of the center of the treatment head according to the distance between the first marking point and the second marking point and the radius of the treatment head, and moves the hydrophone; measures the sound field parameters. By controlling the movement of the hydrophone, recording two positions in the vertical direction when moving to the edge of the plane of the treatment head, and calculating the center position of the plane of the treatment head, the hydrophone can be accurately moved to the center position of the plane of the treatment head, determining the center of the focal region, without having to scan the entire plane to determine the focus of the focal region, saving the test time and reducing the workload.

Description

Technical Field

[0001] This application relates to the field of ultrasonic technology, and particularly to a sound field measurement method, device, and medium. Background Art

[0002] The medical ultrasonic sound field is very important for the treatment effect, especially for focused ultrasound. Through the sound field measurement system, the focus area, the sound intensity at the focal region, the focal area, and the focal depth can be known. These parameters directly affect the treatment effect and are part of the factory inspection. Therefore, it is very necessary to develop a sound field measurement system. After obtaining the above parameters through the sound field measurement system, the quality of the treatment head can be intuitively judged, unqualified treatment heads can be eliminated, and the qualified rate of the product can be improved.

[0003] Currently, during the process of measuring the sound field of a transducer using a hydrophone, the hydrophone is placed in front of the transducer to be measured. Before measurement, the entire focal plane needs to be scanned first to determine the acoustic beam axis or the acoustic beam collimation axis. Determining the acoustic beam axis or the acoustic beam collimation axis can scan the point of maximum sound intensity in the sound field on this axis, that is, the focal point of the focal region. After obtaining this focal point of the focal region, many sound field parameters can be determined. However, it is necessary to scan the entire plane before the focal point of the focal region can be found, which takes a long time and the test process is cumbersome. For example, if the scanning accuracy reaches 1 mm, that is, data is collected once every 1 mm, and the entire measurement range is 60 cm * 60 cm, there are a total of 360,000 data collection points on one plane, the collection time is long, and the amount of data is large.

[0004] It can be seen that how to solve the problem of the too long time required to determine the focal point of the focal region in sound field measurement is a technical problem that needs to be urgently solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this application is to provide a sound field measurement method, device, and medium to solve the problem of the too long time required to determine the focal point of the focal region in sound field measurement.

[0006] To solve the above technical problem, this application provides a sound field measurement method, which is applied to a sound field measurement system. The hydrophone of the sound field measurement system is fixed on the Z-axis, and the treatment head is fixed on the guide rail. The hydrophone is located directly above the plane of the treatment head vertically, and includes:

[0007] Move the position of the hydrophone and keep the running direction of the hydrophone parallel to the plane of the treatment head;

[0008] When the hydrophone moves to the vertical direction at the edge of the plane of the treatment head, record the current position as the first marking point;

[0009] When the hydrophone moves to the vertical direction at the edge of the plane of the treatment head for the second time, record the current position as the second marking point;

[0010] Obtain the distance to be moved and the direction in the vertical direction of the center of the treatment head according to the distance between the first marker point and the second marker point and the radius of the treatment head, and move the hydrophone;

[0011] Measure the acoustic field parameters.

[0012] As a preferred solution, in the above acoustic field measurement method, obtaining the distance to be moved and the direction in the vertical direction of the center of the treatment head according to the distance between the first marker point and the second marker point and the radius of the treatment head, and moving the hydrophone includes:

[0013] Denote the distance between the first marker point and the second marker point as the first distance;

[0014] Obtain the second distance according to the first distance, the radius of the treatment head, and the first formula;

[0015] The first formula is d = (r^2 - (x / 2)^2) 1 / 2 ;

[0016] Wherein, d is the second distance; r is the radius of the treatment head; x is the first distance;

[0017] Move the hydrophone along the connection line direction of the first marker point and the second marker point, and move it by a length of half of the first distance towards the first marker point;

[0018] Move the hydrophone in the direction perpendicular to the connection line of the first marker point and the second marker point and pointing to the center of the circle by a length of the second distance.

[0019] As a preferred solution, in the above acoustic field measurement method, the acoustic field measurement system further includes a distance sensor, and the distance sensor is arranged on the side of the hydrophone; move the position of the hydrophone and keep the running direction of the hydrophone parallel to the plane of the treatment head, and then it further includes:

[0020] Obtain the perpendicular distance between the hydrophone and the plane of the treatment head in real time through the distance sensor;

[0021] If the change range of the perpendicular distance exceeds the preset threshold, it is determined that the hydrophone moves to the vertical direction at the edge of the plane of the treatment head.

[0022] As a preferred solution, in the above acoustic field measurement method, it further includes:

[0023] Obtain the third distance perpendicular to the hydrophone according to the distance sensor;

[0024] Correspondingly, after moving the hydrophone in the direction perpendicular to the connection line of the first marker point and the second marker point and pointing to the center of the circle by a length of the second distance, it further includes:

[0025] Move the hydrophone along the connection line direction of the distance sensor and the hydrophone, and move it towards the hydrophone by a length of the third distance.

[0026] As a preferred solution, in the above sound field measurement method, before moving the position of the hydrophone and making the running direction of the hydrophone parallel to the plane of the treatment head, it further includes:

[0027] Zero the X-axis, Y-axis, and Z-axis.

[0028] As a preferred solution, in the above sound field measurement method, a first position sensor and a second position sensor are arranged near the origin on the X-axis of the sound field measurement system. Correspondingly, zeroing the X-axis includes:

[0029] When the second position sensor detects the motor baffle signal, reduce the current speed of the motor to half of its operation;

[0030] When the first position sensor detects the motor baffle signal, reverse the motor and run it at the current half speed;

[0031] When the second position sensor detects the motor baffle signal again, reverse the motor and run it at the current half speed;

[0032] Stop running until the X-axis runs at a speed less than the preset minimum value and touches the first position sensor.

[0033] As a preferred solution, in the above sound field measurement method, moving the hydrophone includes:

[0034] Control the motors of the X-axis, Y-axis, and Z-axis to move through PWM signals.

[0035] To solve the above technical problems, the present application also provides a sound field measurement device, which is characterized in that it is applied to a sound field measurement system. The hydrophone of the sound field measurement system is fixed on the Z-axis, and the treatment head is fixed on the guide rail. The hydrophone is located directly above the plane of the treatment head vertically. Specifically, it includes:

[0036] A horizontal movement module for moving the position of the hydrophone and making the running direction of the hydrophone parallel to the plane of the treatment head;

[0037] A first recording module for recording the current position as the first marking point when the hydrophone moves to the vertical direction at the edge of the plane of the treatment head;

[0038] A second recording module for recording the current position as the second marking point when the hydrophone moves to the vertical direction at the edge of the plane of the treatment head for the second time;

[0039] A target movement module for obtaining the distance and direction to be moved to the vertical direction of the center of the treatment head according to the distance between the first marking point and the second marking point and the radius of the treatment head, and moving the hydrophone;

[0040] A measurement module, configured to move a hydrophone according to a distance and a direction to be moved, and measure sound field parameters.

[0041] To solve the above technical problems, the present application further provides a sound field measurement device, which is characterized by comprising:

[0042] A memory, configured to store a computer program;

[0043] A processor, configured to implement the steps of the above-mentioned sound field measurement method when executing the computer program.

[0044] To solve the above technical problems, the present application further provides a computer-readable storage medium, which is characterized in that a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps of the above-mentioned sound field measurement method are implemented.

[0045] The sound field measurement method provided by the present application is applied to a sound field measurement system. The hydrophone of the sound field measurement system is fixed on the Z axis, and the treatment head is fixed on a fixed guide rail. The hydrophone is located directly above the vertical plane of the treatment head, and includes: moving the position of the hydrophone, and keeping the running direction of the hydrophone parallel to the plane of the treatment head; when the hydrophone moves to the vertical direction at the edge of the plane of the treatment head, recording the current position as the first marked point; when the hydrophone moves to the vertical direction at the edge of the plane of the treatment head for the second time, recording the current position as the second marked point; obtaining the distance and direction to be moved to the vertical direction of the center of the treatment head according to the distance between the first marked point and the second marked point and the radius of the treatment head, and moving the hydrophone; measuring the sound field moving system, by calculating the center position of the plane of the treatment head, enabling the hydrophone to accurately move to the center position of the plane of the treatment head, determining the center of the focal region, which not only reduces the cumbersome process of determining the center of the focal region after scanning the entire plane, but also saves the test time and reduces the workload.

[0046] In addition, the present application further provides a device and a medium, corresponding to the above method, with the same effect. Description of the Drawings

[0047] To more clearly illustrate the embodiments of the present application, the following will briefly introduce the drawings required for the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0048] Figure 1 It is a flowchart of a sound field measurement method provided by an embodiment of the present application;

[0049] Figure 2 It is a measurement schematic diagram provided by an embodiment of the present application;

[0050] Figure 3 A zeroing schematic diagram provided by an embodiment of the present application;

[0051] Figure 4 A structural diagram of a sound field measurement device provided by an embodiment of the present application;

[0052] Figure 5 A structural diagram of another sound field measurement device provided by an embodiment of the present application. Detailed implementation manners

[0053] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0054] The core of the present application is to provide a sound field measurement method, device and medium, so as to solve the problem that it takes too long to determine the focal point in the focal region during sound field measurement.

[0055] In order to enable those skilled in the art to better understand the solution of the present application, the present application will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0056] During the process of measuring the sound field of a transducer with a hydrophone, the hydrophone is placed in front of the transducer to be measured, and its receiving directivity needs to be collinear with the axial direction of the transducer beam. This process is simply summarized as "making the axial direction of the hydrophone and the axial direction of the transducer on the same straight line" in almost all sound field measurement standards of transducers. In fact, this adjustment process is generally carried out manually, which is both time-consuming and laborious and not easy to be accurate; or through an automatic method, the entire focal plane needs to be scanned before measurement to first determine the beam axis or beam collimation axis. The beam axis or beam collimation axis can scan the point of maximum sound intensity in the sound field on this axis, that is, the focal point in the focal region. However, the focal point in the focal region cannot be found until the entire plane is scanned, which takes a long time and the test process is cumbersome.

[0057] To solve the above problems, this embodiment provides a sound field measurement method, which is applied to a sound field measurement system. The hydrophone of the sound field measurement system is fixed on the Z-axis, and the treatment head is fixed on the guide rail. The hydrophone is located directly above the vertical plane of the treatment head. Figure 1 A flowchart of a sound field measurement method provided by an embodiment of the present application, as Figure 1 shown, includes:

[0058] S11: Move the position of the hydrophone and keep the running direction of the hydrophone parallel to the plane of the treatment head;

[0059] S12: When the hydrophone moves vertically to the edge of the treatment head plane, record the current position as the first marking point;

[0060] S13: When the hydrophone moves vertically to the edge of the treatment head plane for the second time, record the current position as the second marking point;

[0061] S14: Obtain the distance and direction to be moved in the vertical direction to the center of the treatment head based on the distance between the first marking point and the second marking point and the radius of the treatment head, and move the hydrophone;

[0062] S15: Measure the acoustic field parameters.

[0063] This embodiment is applied to an acoustic field measurement system, including: a three-dimensional motion system, namely the X-axis, Y-axis, and Z-axis; a liftable treatment head fixing bracket; a main control board; a hydrophone; a host computer; the hydrophone of the acoustic field measurement system is fixed to the Z-axis, the treatment head is fixed on a fixed guide rail, the hydrophone is located directly above the treatment head plane in the vertical direction, the hydrophone is fixed to the Z-axis, and the distance between the hydrophone and the treatment head is measured by a distance sensor. The treatment head is fixed to the guide rail on the bracket, and a rotating device is provided on the guide rail, and the up and down position of the treatment head can be controlled by the rotating device on the upper side of the guide rail. Preferably, the guide rail includes a plurality of buckles of different models for installing treatment heads of different models.

[0064] It should be noted that the hydrophone is located directly above the treatment head plane, which is only the relative position relationship between the hydrophone and the treatment head plane, that is, the hydrophone is located in the acoustic field emission direction of the treatment head.

[0065] It is necessary to control the three-dimensional motion system to move through the host computer to align the hydrophone with the center position of the treatment head. First, lower the treatment head into the water tank through the bracket, and then move the hydrophone. Due to reasons such as the refraction of water, it is impossible to manually place the hydrophone at the center point of the treatment head. Therefore, first place it approximately in the acoustic field direction of the treatment head, and control the motor to move the hydrophone through the main control board.

[0066] In addition, preferably, an oscilloscope is also included; the hydrophone is connected to the oscilloscope through a voltage amplifier.

[0067] The oscilloscope obtains the sound pressure measured by the hydrophone and converts it into a voltage signal. The oscilloscope displays the voltage signal measured by the hydrophone on the screen. The host computer is connected to the oscilloscope through a network cable to read the oscilloscope data.

[0068] The main control board is connected to the motor through a communication line and connected to the host computer through a 485 communication line. Preferably, the main control board controls the motor movement speed through a Pulse Width Modulation (PWM) model.

[0069] Preferably, the host computer can read the voltage data of the oscilloscope through data analysis software to measure the sound field parameters. For example, according to the formula, the sound intensity I of the current point can be calculated as I = P 2 / ρ / v 声速 , where P is the sound pressure, ρ is the density of water, and v 声速 is the speed of sound waves in water. The sound pressure P = V / M, where V is the voltage displayed on the oscilloscope and M is the hydrophone sensitivity. The sound intensity of the current point can be obtained through this formula. First, control the X-axis to find the maximum sound intensity value on the Y-axis of the center point of the treatment head. Then, at this point, scan a rectangular plane of a*b in the XZ plane, with a point every 1 mm, test and calculate the sound intensity value of this point. The number of scanned points is n = a*b / 1. After scanning n points, according to the maximum point sound intensity I or sound pressure, taking the sound pressure as an example, the area enclosed by the points with a sound pressure of -6 dB of the maximum sound pressure is used to obtain the sound pressure focal region. MATLAB can be used as the data analysis software.

[0070] This application needs to obtain the maximum sound intensity in the sound field. This maximum sound intensity is on the center line of the treatment head, at the focus of the focal region, that is, the center of the circle of the treatment head. When the hydrophone moves to the vertical direction at the edge of the treatment head plane, record the current position as the first marking point. When the hydrophone moves to the vertical direction at the edge of the treatment head plane for the second time, record the current position as the second marking point; according to the distance between the first marking point and the second marking point and the radius of the treatment head, obtain the distance and direction to be moved in the vertical direction to the center of the treatment head, and move the hydrophone. According to the Pythagorean theorem, the position of the center of the circle can be determined by two points on the circle and the radius of the circle.

[0071] This embodiment does not limit how to obtain the distance between the first marking point and the second marking point. It can be calculated according to the three-dimensional coordinates or the linear distance of the hydrophone movement. This embodiment does not make specific limitations. This embodiment also does not limit how to determine that the hydrophone moves to the vertical direction at the edge of the treatment head plane. A distance sensor or a laser sensor can be used for judgment. This embodiment does not make specific limitations and can be set according to actual needs.

[0072] The sound field measurement method provided in this embodiment is applied to a sound field measurement system. The hydrophone of the sound field measurement system is fixed on the Z-axis, and the treatment head is fixed on a fixed guide rail. The hydrophone is located directly above the plane of the treatment head vertically, and it includes: moving the position of the hydrophone and keeping the running direction of the hydrophone parallel to the plane of the treatment head; when the hydrophone moves to the vertical direction at the edge of the plane of the treatment head, recording the current position as the first marked point; when the hydrophone moves to the vertical direction at the edge of the plane of the treatment head for the second time, recording the current position as the second marked point; obtaining the distance and direction to be moved in the vertical direction to the center of the treatment head according to the distance between the first marked point and the second marked point and the radius of the treatment head, and moving the hydrophone; measuring the sound field parameters. By controlling the movement of the hydrophone, recording two positions in the vertical direction at the edge of the plane of the treatment head, calculating the center position of the plane of the treatment head, enabling the hydrophone to accurately move to the center position of the plane of the treatment head, determining the center of the focal region, without having to scan the entire plane to determine the focal point of the focal region, saving the test time and reducing the workload.

[0073] According to the above embodiment, preferably, obtaining the movement scheme for the hydrophone to move to the center of the treatment head according to the first marked point, the second marked point, and the radius of the treatment head includes:

[0074] Denote the distance between the first marked point and the second marked point as the first distance;

[0075] Obtain the second distance according to the first distance, the radius of the treatment head, and the first formula;

[0076] The first formula is d = (r^2 - (x / 2)^2) 1 / 2 ;

[0077] where d is the second distance; r is the radius of the treatment head; x is the first distance;

[0078] Move the hydrophone along the connection line direction between the first marked point and the second marked point, and move it by a length of half of the first distance towards the first marked point;

[0079] Move the hydrophone in the direction perpendicular to the connection line between the first marked point and the second marked point and pointing to the center of the circle by a length of the second distance.

[0080] Figure 2 This is a measurement schematic diagram provided for the embodiment of the present application, as Figure 2As shown, x0 is the first marking point, x1 is the second marking point, the distance from x0 to x1 is x. According to the first formula, d can be obtained. At this time, the hydrophone is located at the second marking point. Then, move the hydrophone along the connection line between the first marking point and the second marking point towards the first marking point by half of the length of the first distance; move the hydrophone in the direction perpendicular to the connection line between the first marking point and the second marking point and pointing to the center of the circle by the length of the second distance. In this way, the hydrophone can be moved to the vertical direction of the center of the treatment head. By this method, the hydrophone can be accurately placed at the center of the treatment head, avoiding the errors caused by manual placement and saving the test time.

[0081] According to the above embodiments, this embodiment provides a preferred solution. The sound field measurement system further includes a distance sensor, and the distance sensor is arranged on the side of the hydrophone; move the position of the hydrophone and keep the running direction of the hydrophone parallel to the plane of the treatment head. After that, it further includes:

[0082] Obtain the vertical distance between the hydrophone and the plane of the treatment head in real time through the distance sensor;

[0083] If the change range of the vertical distance exceeds the preset threshold, it is determined that the hydrophone moves to the vertical direction at the edge of the plane of the treatment head.

[0084] In this embodiment, the vertical distance between the hydrophone and the plane of the treatment head is obtained in real time through the distance sensor. The distance sensor measures the distance between the hydrophone and the treatment head. When the hydrophone is not in front of the treatment head, it measures the distance between the hydrophone and the support or other structures of the treatment head, and this distance is much greater than the distance between the hydrophone and the treatment head. Therefore, when the change range of the vertical distance exceeds the preset threshold, that is, when there is a large change, it is determined that the hydrophone moves to the vertical direction at the edge of the plane of the treatment head.

[0085] Since the hydrophone usually has a small-diameter receiving head (for example, 2 mm), it is not convenient to arrange the distance sensor on the receiving head of the hydrophone. Therefore, in this embodiment, the distance sensor is arranged on the side of the hydrophone, which will cause an error between the position perpendicular to the treatment head detected by the distance sensor and the position perpendicular to the treatment head of the hydrophone. Therefore, if the hydrophone is moved using the data detected by the distance sensor, this error value needs to be corrected at the end. According to the above embodiments, this embodiment provides a preferred solution, which further includes:

[0086] Obtain the third distance perpendicular to the hydrophone according to the distance sensor;

[0087] Correspondingly, move the hydrophone in the direction perpendicular to the connection line between the first marking point and the second marking point and pointing to the center of the circle by the length of the second distance. After that, it further includes:

[0088] Move the hydrophone along the direction of the line connecting the distance sensor and the hydrophone, in the direction of the hydrophone, by a length of a third distance.

[0089] In this embodiment, the third distance perpendicular to the hydrophone is obtained by the distance sensor, that is, the error distance between the distance sensor and the hydrophone. It is necessary to move the hydrophone along the direction of the line connecting the distance sensor and the hydrophone, in the direction of the hydrophone, by a length of a third distance to correct the error generated by the data detected by the distance sensor for use.

[0090] According to the above embodiment, this embodiment provides a preferred solution. Before moving the position of the hydrophone and making the running direction of the hydrophone parallel to the plane of the treatment head, it also includes:

[0091] Zero the X-axis, Y-axis, and Z-axis.

[0092] In this embodiment, the three axes are zeroed before actual measurement to reduce subsequent measurement errors.

[0093] If there is only one position sensor, when zeroing, due to the initially faster motor speed v0, there is a time delay between when the position sensor detects a signal and when the motor sends a stop command, which will result in unsuccessful zeroing, that is, there is an error. Taking the X-axis as an example, this embodiment provides a preferred solution. A first position sensor and a second position sensor are arranged near the origin of the X-axis of the sound field measurement system. Correspondingly, zeroing the X-axis includes:

[0094] When the second position sensor detects the motor baffle signal, reduce the current speed of the motor to half of its operation;

[0095] When the first position sensor detects the motor baffle signal, reverse the motor to run at the current half speed;

[0096] When the second position sensor detects the motor baffle signal again, reverse the motor to run at the current half speed;

[0097] Until the X-axis runs at a speed less than the preset minimum value and touches the first position sensor, then stop running.

[0098] Figure 3 A zeroing schematic diagram provided for the embodiment of the present application, as Figure 3As shown, the first position sensor and the second position sensor are arranged near one end of the origin. In this application, two position sensors are used. When the first sensor detects a signal, the motor speed is immediately halved, that is, the speed is v0 / 2. When the second position sensor detects a signal, the motor stops immediately and runs in the reverse direction at a speed of v0 / 4. When the first position sensor detects a signal again, the motor stops immediately and runs in the reverse direction at a speed of v0 / 8, and so on until the three axes run at a very small speed and touch the first position sensor, then the operation stops. At this time, the error of the three axes from the origin is very small and can be ignored. In this embodiment, two sensors are used to decelerate multiple times to reduce the position error caused by the motor speed, which can ensure that the motor is at the reference point position before each use, so that the measured data is more accurate each time. After zeroing, the positions of the X-axis, Y-axis, and Z-axis are all cleared. After that, the values of the three positions all represent the relative positions from the origin. In this way, no matter whether the motor runs forward or backward, the values of the three positions are the actual values in three dimensions. The next movement of the motor is carried out based on the current position value.

[0099] Preferably, the X-axis further includes a third position sensor, which is arranged at the tail of the guide rail to prevent the motor from hitting the tail of the guide rail.

[0100] According to the above embodiment, this embodiment provides a preferred solution to keep the distance parallel to the plane of the treatment head and move the position of the hydrophone parallelly, including:

[0101] Control the motors of the X-axis, Y-axis, and Z-axis to move through PWM signals.

[0102] The main control board is connected to the motor driver through a communication line and connected to the computer through a 485 communication line. The main control board controls the motor movement speed through PWM. The motor operation control is carried out by outputting PWM through the corresponding pins of the main control board. Since there is one motor for each of the X-axis, Y-axis, and Z-axis, three-way PWM is required for control. The frequency of the three-way PWM determines the motor operation speed. The motor operation speed is sent from the upper computer to the main control board. For example, the three-way PWM output adopts the general-purpose input / output (GPIO) analog PWM output method and the timer counting method. This method can accurately know the number of PWMs output. Because for 1 PWM, the motor moves 10um. During actual testing, the motor measures a point every 1mm. Moreover, the entire operation range is obtained by calculating the number of PWMs. The duty cycle is 50%. For each pulse, the guide rail moves forward 10um. After the upper computer sends the moving distance to the main control board, the number of pulses P = L / 0.01.

[0103] In the above embodiments, the sound field measurement method has been described in detail. The present application also provides embodiments corresponding to the sound field measurement device. It should be noted that the embodiments of the device part of the present application are described from two perspectives, one is from the perspective of functional modules, and the other is from the perspective of hardware.

[0104] From the perspective of functional modules, Figure 4 FIG. is a structural diagram of a sound field measurement device provided by an embodiment of the present application. As Figure 4 shown, a sound field measurement device is applied to a sound field measurement system. The hydrophone of the sound field measurement system is fixed on the Z-axis, and the treatment head is fixed on a fixed guide rail. The hydrophone is located directly above the plane of the treatment head vertically. Specifically, it includes:

[0105] A horizontal movement module 31 for moving the position of the hydrophone and keeping the running direction of the hydrophone parallel to the plane of the treatment head;

[0106] A first recording module 32 for recording the current position as the first marked point when the hydrophone moves to the vertical direction at the edge of the plane of the treatment head;

[0107] A second recording module 33 for recording the current position as the second marked point when the hydrophone moves to the vertical direction at the edge of the plane of the treatment head for the second time;

[0108] A reference movement module 34 for obtaining the distance and direction to be moved to the vertical direction of the center of the treatment head according to the distance between the first marked point and the second marked point and the radius of the treatment head, and moving the hydrophone;

[0109] A measurement module 35 for measuring sound field parameters.

[0110] For the sound field measurement device provided in this embodiment, the movement module 31 maintains a parallel distance from the plane of the treatment head and moves the position of the hydrophone parallelly; the first recording module 32 records the current position as the first marked point when the hydrophone moves to the edge of the plane of the treatment head; the second recording module 33 records the current position as the second marked point when the hydrophone moves to the edge of the plane of the treatment head for the second time; the reference movement module 34 obtains the movement plan for the hydrophone to move to the center of the treatment head according to the first marked point, the second marked point, and the radius of the treatment head; the measurement module 35 moves the hydrophone according to the distance and direction to be moved and measures the sound field parameters. By calculating the center position of the plane of the treatment head, the hydrophone can be accurately moved to the center position of the plane of the treatment head to determine the focal region center, which not only reduces the cumbersome process of determining the focal region center after scanning the entire plane, but also saves the test time and reduces the workload.

[0111] In addition, the device further includes:

[0112] A first marking unit, configured to record the distance between the first marking point and the second marking point as a first distance;

[0113] A calculation unit, configured to obtain a second distance according to the first distance, the radius of the treatment head, and a first formula;

[0114] The first formula is d = (r^2 - (x / 2)^2) 1 / 2 ;

[0115] wherein, d is the second distance; r is the radius of the treatment head; x is the first distance;

[0116] A first moving unit, configured to move the hydrophone along the connection line direction of the first marking point and the second marking point, and move the hydrophone towards the first marking point by a length of one half of the first distance;

[0117] A second moving unit, configured to move the hydrophone in the direction perpendicular to the connection line of the first marking point and the second marking point and pointing to the center of the circle by a length of the second distance.

[0118] A vertical acquisition module, configured to acquire in real time the vertical distance between the hydrophone and the plane of the treatment head through the distance sensor;

[0119] An edge judgment module, configured to judge that the hydrophone moves to the vertical direction at the edge of the plane of the treatment head if the change range of the vertical distance exceeds a preset threshold.

[0120] A calibration distance acquisition module, configured to acquire a third distance perpendicular to the hydrophone according to the distance sensor;

[0121] A calibration moving module, configured to move the hydrophone along the connection line direction of the distance sensor and the hydrophone, and move the hydrophone towards the hydrophone by a length of the third distance.

[0122] A deceleration module, configured to reduce the current speed of the motor to half when the second position sensor detects a motor tab signal; when the first position sensor detects a motor tab signal, the motor runs in the reverse direction at the current half speed; when the second position sensor detects a motor tab signal again, the motor runs in the reverse direction at the current half speed;

[0123] A stop module, configured to stop running until the X-axis runs at a speed less than a preset minimum value and touches the first position sensor.

[0124] Since the embodiments of the device part correspond to the embodiments of the method part, for the embodiments of the device part, please refer to the description of the embodiments of the method part, which will not be elaborated here for the time being.

[0125] Figure 5 The structural diagram of another sound field measurement device provided by an embodiment of the present application is shown as Figure 5 shown. The sound field measurement device includes: a memory 40 for storing a computer program;

[0126] a processor 41 for implementing the steps of the method for obtaining user operation habit information as described in the above embodiment (sound field measurement method) when executing the computer program.

[0127] The sound field measurement device provided by this embodiment may include but is not limited to a smart phone, a tablet computer, a notebook computer, a desktop computer, etc.

[0128] Among them, the processor 41 may include one or more processing cores, such as a 4-core processor, an 8-core processor, etc. The processor 41 may be implemented in at least one hardware form of a digital signal processor (DSP), a field-programmable gate array (FPGA), and a programmable logic array (PLA). The processor 41 may also include a main processor and a coprocessor. The main processor is a processor for processing data in the wake state, also known as a central processing unit (CPU); the coprocessor is a low-power processor for processing data in the standby state. In some embodiments, the processor 41 may be integrated with a graphics processing unit (GPU), and the GPU is responsible for rendering and drawing the content to be displayed on the display screen. In some embodiments, the processor 41 may further include an artificial intelligence (AI) processor, and the AI processor is used to process computing operations related to machine learning.

[0129] The memory 40 may include one or more computer-readable storage media, which may be non-transitory. The memory 40 may also include high-speed random access memory and non-volatile memory, such as one or more magnetic disk storage devices and flash storage devices. In this embodiment, the memory 40 is at least used to store the following computer program 401. After the computer program is loaded and executed by the processor 41, the relevant steps of the sound field measurement method disclosed in any of the foregoing embodiments can be implemented. In addition, the resources stored in the memory 40 may also include an operating system 402, data 403, etc., and the storage method may be transient storage or permanent storage. Among them, the operating system 402 may include Windows, Unix, Linux, etc. The data 403 may include, but is not limited to, the data involved in implementing the sound field measurement method.

[0130] In some embodiments, the sound field measurement device may further include a display screen 42, an input / output interface 43, a communication interface 44, a power supply 45, and a communication bus 46.

[0131] Those skilled in the art can understand that Figure 5 the structure shown in does not constitute a limitation on the sound field measurement device, and may include more or fewer components than those shown in the figure.

[0132] The sound field measurement device provided by the embodiment of the present application includes a memory and a processor. When the processor executes the program stored in the memory, the following method can be implemented: a sound field measurement method, which is applied to a sound field measurement system. The hydrophone of the sound field measurement system is fixed on the Z axis, and the treatment head is fixed on a fixed guide rail. The hydrophone is located directly above the vertical plane of the treatment head, and includes: moving the position of the hydrophone and keeping the running direction of the hydrophone parallel to the plane of the treatment head; when the hydrophone moves to the vertical direction at the edge of the plane of the treatment head, recording the current position as the first marked point; when the hydrophone moves to the vertical direction at the edge of the plane of the treatment head for the second time, recording the current position as the second marked point; obtaining the distance and direction to be moved in the vertical direction of the center of the treatment head according to the distance between the first marked point and the second marked point and the radius of the treatment head, and moving the hydrophone; measuring the sound field dynamic system, and by calculating the center position of the plane of the treatment head, the hydrophone can be accurately moved to the center position of the plane of the treatment head to determine the focal region center, which not only reduces the cumbersome process of determining the focal region center after scanning the entire plane, but also saves the test time and reduces the workload.

[0133] Finally, the present application also provides an embodiment corresponding to a computer-readable storage medium. A computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps recorded in the above-mentioned sound field measurement method embodiment are implemented.

[0134] It can be understood that if the methods in the above embodiments are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solutions of the present application, in essence, or the parts that contribute to the prior art, or all or part of the technical solutions, can be embodied in the form of a software product. This computer software product is stored in a storage medium and executes all or part of the steps of the methods in the various embodiments of the present application. The aforementioned storage medium includes: various media that can store program codes such as USB flash drives, mobile hard disks, read-only memories (ROM), random access memories (RAM), magnetic disks, or optical discs.

[0135] The computer-readable storage medium provided in this embodiment stores a computer program. When the processor executes this program, the following method can be implemented: a sound field measurement method, applied to a sound field measurement system. The hydrophone of the sound field measurement system is fixed on the Z-axis, and the treatment head is fixed on a fixed guide rail. The hydrophone is located directly above the plane of the treatment head vertically. The method includes: moving the position of the hydrophone and keeping the running direction of the hydrophone parallel to the plane of the treatment head; when the hydrophone moves to the vertical direction at the edge of the plane of the treatment head, record the current position as the first marked point; when the hydrophone moves to the vertical direction at the edge of the plane of the treatment head for the second time, record the current position as the second marked point; obtain the distance and direction to be moved in the vertical direction to the center of the treatment head according to the distance between the first marked point and the second marked point and the radius of the treatment head, and move the hydrophone; measure the sound field dynamic system. By calculating the center position of the plane of the treatment head, the hydrophone can be accurately moved to the center position of the plane of the treatment head to determine the center of the focal region, which not only reduces the cumbersome process of determining the center of the focal region after scanning the entire plane, but also saves the test time and reduces the workload.

[0136] The above has introduced in detail the sound field measurement method, device, and medium provided by the present application. The embodiments in the specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other. For the device disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple. For the relevant parts, refer to the description in the method part. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

[0137] It should also be noted that in this specification, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent in such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the element.

Claims

1. A sound field measurement method, characterized in that, Applied to a sound field measurement system, where the hydrophone of the sound field measurement system is fixed on the Z-axis, and the treatment head is fixed on the guide rail. The hydrophone is located directly above the plane of the treatment head vertically, and it includes: Move the position of the hydrophone and make the running direction of the hydrophone parallel to the plane of the treatment head; When the hydrophone moves to the vertical direction at the edge of the plane of the treatment head, record the current position as the first marked point; When the hydrophone moves to the vertical direction at the edge of the plane of the treatment head for the second time, record the current position as the second marked point; According to the distance between the first marked point and the second marked point and the radius of the treatment head, obtain the distance and direction to be moved in the vertical direction to the center of the treatment head, and move the hydrophone; Measure the sound field parameters.

2. The sound field measurement method according to claim 1, characterized in that, The step of obtaining the distance and direction to be moved in the vertical direction to the center of the treatment head according to the distance between the first marked point and the second marked point and the radius of the treatment head, and moving the hydrophone includes: Denote the distance between the first marked point and the second marked point as the first distance; Obtain the second distance according to the first distance, the radius of the treatment head, and the first formula; The first formula is d = (r^2 - (x / 2)^2) 1 / 2 ; Where d is the second distance; r is the radius of the treatment head; x is the first distance; Move the hydrophone along the connection line direction between the first marked point and the second marked point, and move the hydrophone by a length of half of the first distance towards the first marked point; Move the hydrophone in the direction perpendicular to the connection line between the first marked point and the second marked point and pointing to the center of the circle by a length of the second distance.

3. The sound field measurement method according to claim 2, wherein, The sound field measurement system further includes a distance sensor, and the distance sensor is arranged on the side of the hydrophone; after moving the position of the hydrophone and making the running direction of the hydrophone parallel to the plane of the treatment head, it further includes: Obtain the vertical distance between the hydrophone and the plane of the treatment head in real time through the distance sensor; If the change range of the vertical distance exceeds the preset threshold, it is determined that the hydrophone moves to the vertical direction at the edge of the plane of the treatment head.

4. The sound field measurement method according to claim 3, wherein It further includes: Obtain the third distance perpendicular to the hydrophone according to the distance sensor; Correspondingly, after moving the hydrophone in the direction perpendicular to the connection line between the first marked point and the second marked point and pointing to the center of the circle by a length of the second distance, it further includes: Move the hydrophone along the connection line direction between the distance sensor and the hydrophone, and move the hydrophone by a length of the third distance towards the hydrophone.

5. The sound field measurement method according to claim 1, characterized in that, Before moving the position of the hydrophone and making the running direction of the hydrophone parallel to the plane of the treatment head, it further includes: Zero the X-axis, Y-axis, and Z-axis.

6. The sound field measurement method according to claim 5, wherein A first position sensor and a second position sensor are arranged near the origin on the X-axis of the sound field measurement system. Correspondingly, zeroing the X-axis includes: When the second position sensor detects the motor stop signal, reduce the current speed of the motor to half of the original speed for operation; When the first position sensor detects the motor stop signal, then run the motor in the reverse direction at the current half speed; When the second position sensor detects the motor tab signal again, the motor is reversed to run at half of the current speed; It stops running until the X-axis runs at a speed less than the preset minimum value and touches the first position sensor.

7. The sound field measurement method according to any one of claims 1 to 6, characterized in that, Moving the hydrophone includes: Controlling the motors of the X-axis, Y-axis, and Z-axis to move through PWM signals.

8. An acoustic field measurement device, characterized in that, Applied to an acoustic field measurement system, the hydrophone of the acoustic field measurement system is fixed on the Z-axis, and the treatment head is fixed on the guide rail. The hydrophone is located directly above the treatment head plane vertically. Specifically, it includes: A horizontal movement module for moving the position of the hydrophone and keeping the running direction of the hydrophone parallel to the treatment head plane; A first recording module for recording the current position as the first marking point when the hydrophone moves to the vertical direction at the edge of the treatment head plane; A second recording module for recording the current position as the second marking point when the hydrophone moves to the vertical direction at the edge of the treatment head plane for the second time; A reference movement module for obtaining the distance and direction to be moved in the vertical direction to the center of the treatment head according to the distance between the first marking point and the second marking point and the radius of the treatment head, and moving the hydrophone; A measurement module for measuring acoustic field parameters.

9. An acoustic field measurement device, characterized in that, It includes: A memory for storing computer programs; A processor for implementing the steps of the acoustic field measurement method according to any one of claims 1 to 7 when executing the computer program.

10. A computer-readable storage medium, characterized in that, A computer program is stored on the computer-readable storage medium, and when the computer program is executed by the processor, the steps of the acoustic field measurement method according to any one of claims 1 to 7 are implemented.

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