CN113188652A - Method and device for measuring acoustic radiation force in suspension sound field - Google Patents
Method and device for measuring acoustic radiation force in suspension sound field Download PDFInfo
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- CN113188652A CN113188652A CN202110432770.3A CN202110432770A CN113188652A CN 113188652 A CN113188652 A CN 113188652A CN 202110432770 A CN202110432770 A CN 202110432770A CN 113188652 A CN113188652 A CN 113188652A
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- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
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Abstract
The invention discloses a method and a device for measuring acoustic radiation force in a suspension sound field, wherein the method comprises the following steps: the precise lifting platform can vertically move up and down in the Z-axis direction; the two-dimensional moving platform is arranged on the upper surface of the precision lifting platform and can move left and right back and forth in the X-axis direction and the Y-axis direction; the balance is placed on the upper surface of the two-dimensional moving platform, and a balance tray is placed on the balance; one end of the rigid thin rod is connected with the balance tray, and the other end of the rigid thin rod is connected with the object to be detected and suspended. The simple measuring device is operated by combining the precise lifting platform and the two-dimensional moving platform, not only can measure the acoustic radiation force of an object in a three-dimensional space of sound field distribution, but also can realize the change and flexible movement of the acoustic radiation force testing position in the whole sound field, thereby measuring the acoustic radiation force at different positions in the whole sound field.
Description
Technical Field
The invention belongs to the technical field of ultrasonic suspension equipment, and particularly relates to a method and a device for measuring acoustic radiation force in a suspension sound field.
Background
With the continuous development of scientific technology, the demand of non-contact control technology is more and more urgent, and the application field is more and more extensive. The non-contact control technology relates to magnetic suspension, optical suspension, electrostatic suspension, pneumatic suspension, acoustic suspension and the like. Compared with other suspension technologies, the acoustic suspension has the characteristics of simple structure, small and exquisite device and the like, has no special requirements on the physical properties of suspended object materials and the external environment, and has better suspension capacity and flexible controllability.
The acoustic suspension comprises standing wave suspension, near field suspension and the like, and related technologies can be flexibly applied to nondestructive control of high-precision electronic components such as chips and the like, and can also be applied to the fields of biology, medicine and medicine, such as cell culture, protein crystallization, medicine release and the like, which require clean environment and high-precision operation processes. The physical essence of realizing suspension is that an object is subjected to sound radiation force capable of balancing gravity in a sound field, so that a non-contact suspension state is realized. In order to design the effect of sound wave suspension more accurately, the sound wave is utilized to realize a non-contact control technology, and the sound wave suspension technology is more effectively applied to industrial production and national industry, so that the size and the distribution rule of sound radiation force need to be accurately known.
Since the acoustic radiation force is the integral of the acoustic radiation pressure at the surface of the object, its magnitude is closely related to the shape of the object. In the prior art, the sound radiation force is generally obtained by directly predicting the sound radiation force through a theoretical model or measuring the sound pressure distribution of a sound field through a miniature microphone and calculating on the basis, so that the conventional research method is mainly based on theoretical modeling and lacks an effective experimental measurement technology, and the reasonability of the theoretical model needs to be verified by experimental data, so that a simple and effective experimental measurement method needs to be provided.
Disclosure of Invention
The invention aims to provide a method and a device for measuring acoustic radiation force in a suspension sound field, which can realize the measurement of the acoustic radiation force of a measured object in a sound field distribution space and can realize the flexible movement of an acoustic radiation force test position in a whole sound field.
In order to achieve the above object, according to one aspect of the present invention, there is provided an apparatus for measuring acoustic radiation force in a levitation sound field, comprising: the precise lifting platform can vertically move up and down in the z-axis direction; the two-dimensional moving platform is arranged on the upper surface of the precision lifting platform and can move front and back and left and right in the directions of the x axis and the y axis; the balance is placed on the upper surface of the two-dimensional moving platform, and a balance tray is placed on the balance; one end of the rigid thin rod is connected with the balance tray, and the other end of the rigid thin rod is connected with the object to be detected and suspended.
According to the invention, one side or two sides of the measuring device are also provided with ultrasonic wave emitting devices so as to realize the measurement of the distribution condition of the sound radiation force in a complex sound field formed by the superposition of single ultrasonic wave or multiple ultrasonic waves.
According to the invention, one end of the rigid rod is bonded to the balance pan.
According to the invention, the length of the rigid thin rod needs to meet the requirements of measurement space and position, and the diameter of the cross section is as small as possible, so that the distribution rule of the sound field is not influenced.
According to another aspect of the present invention, there is also provided a method for measuring with a measuring device of acoustic radiation force in a levitation sound field, comprising the steps of:
s1, fixing the object to be measured at one end of the rigid thin rod and suspending the object in the air, and fixing the other end of the rigid thin rod on a balance tray;
s2, opening the ultrasonic emission devices positioned at one side or two sides of the measuring device to enable the object to be measured to be positioned in the sound field space;
s3, reading the equivalent mass M of the acoustic radiation force by a balance, and obtaining a measurement result of the acoustic radiation force F according to the acoustic radiation force F, the gravity G and the gravity G, wherein the G is the gravity acceleration;
s4, adjusting the position of the two-dimensional moving platform in the X and Y directions and the position of the precision lifting platform in the Z direction, realizing the sound radiation force measurement of the three-dimensional sound field full-space position, and obtaining the sound radiation force data and the distribution rule.
According to the invention, the object to be detected is spherical, pie-shaped or irregular solid object shape.
According to the invention, the spatial displacement accuracy of the object to be measured is higher than 1 mm.
According to another aspect of the invention, the application of the device for measuring the acoustic radiation force in the suspension sound field in the fields of material science, biomedicine and precise mechanical manufacturing is also provided.
The invention has the beneficial effects that:
the simple measuring device for the acoustic radiation force in the suspension sound field can measure the acoustic radiation force of an object in a three-dimensional space of the sound field distribution through the combined operation of the precise lifting platform and the two-dimensional moving platform, can realize the change and the flexible movement of the acoustic radiation force test position in the whole sound field, can measure the acoustic radiation force at different positions in the whole sound field, is suitable for the measurement conditions of single-axis acoustic suspension, three-axis acoustic suspension, near-field acoustic suspension and acoustic radiation force in various sound fields, has flexible measuring method, strong operability and simplicity, and is expected to realize important application in the related application fields of suspension technology, such as mechanical engineering, material science, biochemistry and the like.
Drawings
Fig. 1 is a schematic structural diagram of an acoustic radiation force measuring apparatus in a three-dimensional acoustic field according to the present invention.
Fig. 2 is a schematic diagram of the measurement result of the acoustic radiation force of the ultrasonic generator at different positions when the measuring device of the present invention is applied to a single-axis ultrasonic levitation device.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and embodiments. It should be emphasized that the specific embodiments described herein are merely illustrative of the invention, are some, not all, and therefore do not limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in FIG. 1, the device for measuring the acoustic radiation force in the suspended sound field comprises a precision lifting platform 6, a two-dimensional moving platform 5, a balance 3, a balance tray 4 and a rigid slender rod 2. The two-dimensional moving platform 5 is arranged on the upper surface of the precision lifting platform 6 and can move back and forth or left and right in the X-axis direction and the Y-axis direction, and the precision lifting platform 6 can vertically move up and down in the Z-axis direction. The balance 3 is placed on the upper surface of the two-dimensional moving platform 5, and the balance tray 4 is placed on the balance 3. One end of the rigid thin rod 2 is connected with the balance tray 4, and the other end of the rigid thin rod is connected with the object 1 to be measured and is suspended in the air. The balance 3 and the balance tray 4 used in the present invention are both high precision.
The invention can measure the sound radiation force of an object in a sound field distribution three-dimensional space through the combined operation of the precise lifting platform and the two-dimensional moving platform, and can realize the change and the flexible movement of the sound radiation force test position in the whole sound field, thereby measuring the sound radiation force at different positions in the whole sound field and obtaining the sound radiation force data and the distribution rule. The simple measuring device is simple and convenient, is suitable for measuring acoustic radiation force in single-axis acoustic suspension, three-axis acoustic suspension, near-field acoustic suspension and various sound fields, and is expected to realize important application in the related application fields of suspension technology, such as mechanical engineering, material science, biochemistry and the like.
The invention can also realize the measurement of the distribution condition of the sound radiation force in a complex sound field formed by a single-beam ultrasonic wave or multi-beam ultrasonic wave emitting device, has the advantages of good flexibility, high measurement precision and the like, and has less influence on the sound field in the measurement process.
As shown in fig. 1, one end of the rigid rod 2 can be adhered to the balance tray 4, or can be fixed by other methods such as insertion, clamping, screw connection, etc., as long as the operation is convenient and the fixation is firm.
Preferably, the length of the rigid thin rod 2 is 5-20 cm, and the diameter of the cross section is less than or equal to 2 mm. In order to reduce the influence of the introduction of the measuring device on the sound field, when the length of the rigid thin rod 2 meets the measuring requirement, the section size should be as small as possible on the premise of ensuring the rigidity. The precise lifting platform 6, the two-dimensional moving platform 5, the balance 3, the balance tray 4 and the like are placed on the premise that the sound field is not influenced. The balance 3 and the balance tray 4 are both high-precision, and the high-precision means that the measurement error of the balance is less than 0.1 g.
The simple measuring device can measure the sound radiation force of objects with different shapes, such as solid objects, in a sound field, wherein the solid objects can be spherical, cake-shaped or irregular objects. During testing, the solid to be tested is placed in a sound field, the magnitude of the sound radiation force borne by the object is obtained through the number indicating conversion of the balance, and the sound radiation force in the vertical upward direction and the vertical downward direction can be measured.
The sound radiation force of the object to be measured is measured by connecting the object to be measured with different shapes to one end of the rigid thin rod 2, and the sound radiation force of the solid object can be directly measured. The sound field theoretical model can be corrected through experimental data, and an optimized sound field model is obtained on the basis, so that the acoustic radiation force of the suspended object can be more accurately theoretically described and predicted.
According to another aspect of the present invention, there is also provided a method for measuring with a simple measuring device of acoustic radiation force in a levitation sound field, comprising the steps of: s1, fixing the object 1 to be measured at one end of the rigid thin rod 2 and suspending the object in the air, and fixing the other end of the rigid thin rod 2 on the balance tray 4; s2, opening the ultrasonic emission devices positioned at one side or two sides of the measuring device to enable the object 1 to be measured to be positioned in the sound field space; s3, reading the equivalent mass M of the acoustic radiation force from the balance 3, and obtaining a measurement result of the acoustic radiation force F according to the acoustic radiation force F-G, where G is the gravitational acceleration; s4, adjusting the positions of the two-dimensional moving platform 5 in the X and Y directions and the position of the precision lifting platform 5 in the Z direction, realizing the acoustic radiation force measurement of the sound field full-space position, and obtaining acoustic radiation force data and a distribution rule.
The spatial displacement precision of the object 1 to be measured is higher than 1 mm. The precision depends on the motion platform, can be higher than 0.1mm or 0.01mm, and the displacement precision of the platform is changed according to the measured space position precision.
According to another aspect of the invention, the application of the device for measuring the acoustic radiation force in the suspension sound field in the fields of material science, biomedicine and precise mechanical manufacturing is further provided. If the simple measuring method and the device are adopted to measure the acoustic radiation force or the distribution rule of the acoustic radiation force borne by the object in the single-axis acoustic levitation field; the measurement technology is adopted to measure the sound radiation force or the distribution rule of the sound radiation force applied to an object in a sound field.
Example 1
The simple measuring device is applied to the acoustic radiation force measurement of the single-axis ultrasonic suspension device, the ultrasonic frequency is 21kHz, the ultrasonic generator is arranged at the upper end, the distance between the transmitting end and the reflecting end is 40mm, and when the suspended object is a steel ball with the diameter of 8mm, the measuring result is shown by the chain line in figure 2.
Example 2
The simple measuring device is applied to the acoustic radiation force measurement of the single-axis ultrasonic suspension device, the ultrasonic frequency is 21kHz, the ultrasonic generator is arranged at the lower end, the distance between the transmitting end and the reflecting end is 40mm, and when the suspended object is an 8mm steel ball, the measurement result is shown as a solid line in figure 2.
Example 3
The simple measuring device is applied to the acoustic radiation force measurement of a single-axis ultrasonic suspension device, the ultrasonic frequency is 21kHz, ultrasonic generators are arranged at the upper end and the lower end of the simple measuring device, the distance between the transmitting end and the reflecting end is 40mm, and when a suspended object is an 8mm steel ball, the measuring result is shown by a dotted line in figure 2.
As can be seen from fig. 2, in the operation of the lower-end single-beam ultrasonic wave, the acoustic radiation force at the node is reduced along with the increasing distance between the suspended object and the ultrasonic transmitting end, which is similar to near-field acoustic suspension. For the working mode of the upper end single-beam ultrasonic wave, the sound radiation force at the node is also reduced along with the continuous increase of the distance between the suspended object and the ultrasonic transmitting end. The working modes of the upper and lower double-beam ultrasonic waves can effectively avoid the defects of the two working modes, and provide larger suspension force and wider suspension potential wells. Therefore, the simple acoustic radiation force measuring method can be used for researching the acoustic radiation force distribution characteristics of different sound field working modes, provides favorable guidance for the optimization design of the ultrasonic levitation device, and can also provide necessary data for the optimization design of the ultrasonic-based non-contact transmission device.
The foregoing is only a preferred application of the present invention, and it should be noted that, for those skilled in the art, various modifications and improvements can be made without departing from the technical principle of the present invention, and these modifications and improvements should also be considered as the protection scope of the present invention.
Claims (7)
1. An apparatus for measuring acoustic radiation force in a suspended acoustic field, comprising:
the precise lifting platform (6) can vertically move up and down in the Z-axis direction;
the two-dimensional moving platform (5) is arranged on the upper surface of the precision lifting platform (6) and can move back and forth and left and right in the X-axis direction and the Y-axis direction;
the balance (3) is placed on the upper surface of the two-dimensional moving platform (5), and a balance tray (4) is placed on the balance (3);
one end of the rigid thin rod (2) is connected with the balance tray (4), and the other end of the rigid thin rod is connected with the object to be measured (1) and is suspended in the air.
2. The measuring device according to claim 1, wherein one side or both sides of the measuring device are further provided with ultrasonic emission devices to realize measurement of the distribution of acoustic radiation force in a complex sound field formed by superposition of single ultrasonic wave or multiple ultrasonic waves.
3. A measuring device according to claim 1, characterized in that one end of the rigid rod (2) is glued to the balance tray (4).
4. A method for measurement by using the device for measuring acoustic radiation force in a suspended acoustic field according to any one of claims 1 to 3, comprising the steps of:
s1, fixing the object (1) to be measured at one end of the rigid thin rod (2) and suspending the object in the air, and fixing the other end of the rigid thin rod (2) on the balance tray (4);
s2, opening the ultrasonic emission devices positioned at one side or two sides of the measuring device to enable the object (1) to be measured to be positioned in a sound field space;
s3, reading the equivalent mass M of the acoustic radiation force by the balance (3), and obtaining a measurement result of the acoustic radiation force F according to the acoustic radiation force F, the gravity G, and the G is the gravity acceleration;
s4, adjusting the position of the two-dimensional moving platform (5) in the X and Y directions and the position of the precision lifting platform (5) in the Z direction, realizing the acoustic radiation force measurement of the sound field full space position, and obtaining acoustic radiation force data and a distribution rule.
5. The assay method according to claim 4, wherein the object (1) to be assayed is a solid spherical, cake-shaped or irregular shape.
6. The determination method according to claim 4, characterized in that the accuracy of the spatial displacement of the object (1) to be measured is higher than 1 mm.
7. Use of the device for measuring acoustic radiation force in a suspended acoustic field according to any of claims 1 to 3 in the fields of material science, biomedicine, physicochemical and precision mechanical manufacturing.
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| CN202110432770.3A CN113188652A (en) | 2021-04-21 | 2021-04-21 | Method and device for measuring acoustic radiation force in suspension sound field |
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| CN202110432770.3A CN113188652A (en) | 2021-04-21 | 2021-04-21 | Method and device for measuring acoustic radiation force in suspension sound field |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116296231A (en) * | 2023-01-09 | 2023-06-23 | 哈尔滨工业大学（深圳） | Air floatation balance for measuring wall friction of high-speed non-zero pressure gradient turbulence boundary layer |
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2021
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Cited By (2)
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| CN116296231A (en) * | 2023-01-09 | 2023-06-23 | 哈尔滨工业大学（深圳） | Air floatation balance for measuring wall friction of high-speed non-zero pressure gradient turbulence boundary layer |
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Application publication date: 20210730 |