Ultrasonic transducer sound field characteristic automatic calibration device based on hydrophone method

Abstract

The utility model provides an ultrasonic transducer sound field characteristic automatic calibration device based on a hydrophone method. The ultrasonic transducer sound field characteristic automatic calibration device comprises a silencing water tank system, a manual five-degree-of-freedom movement mechanism, an electric five-degree-of-freedom movement mechanism, an ultrasonic transducer clamping support and a standard hydrophone clamping support. And a five-dimensional sound field scanning system, an ultrasonic pulse excitation system, a hydrophone sound pressure test system and the like are built by taking an industrial personal computer host system as a core, so that the integration of the systems is realized. The utility model has the characteristics of simple and convenient operation, simple and reliable structure, excellent performance and the like, and the newly designed transducer clamping mechanism and hydrophone clamping mechanism have the advantages of convenient and fast operation, reliable clamping effect and the like, and are suitable for various types of sensors; the manual five-degree-of-freedom motion structure can conveniently adjust the position of the transducer, and the transducer can be conveniently centered and installed.

Description

Technical Field

[0001] This utility model belongs to the field of acoustic metrology, specifically relating to an automatic calibration device for the acoustic field characteristics of an ultrasonic transducer based on the hydrophone method. Background Technology

[0002] An ultrasonic transducer is an energy conversion device that converts alternating electrical signals into acoustic signals or acoustic signals from an external sound field into electrical signals within the ultrasonic frequency range. At the forefront of ultrasonic nondestructive testing (NDT) technology, the ultrasonic transducer is a key component and a crucial guarantee for the accuracy and reliability of NDT results. Its performance directly affects the effectiveness and application scope of ultrasonic NDT technology.

[0003] In the field of metrology, the calibration of ultrasonic transducers is mainly carried out according to the "JJF 1650-2017 Standard for Calibration of Acoustic Field Characteristics of Ultrasonic Flaw Detectors". JJF 1650 is based on the hydrophone method to measure ultrasonic signals and scan the sound field to obtain sound field characteristic parameters. The hydrophone method is currently the recommended method for sound pressure measurement in ultrasonic sound fields. Its advantages are that the measurement results are intuitive and can completely reflect the waveform of the sound wave. It is the standard for calibrating the acoustic characteristic parameters of transducers in various fields. Its main principle is to use a hydrophone to perform mechanical scanning motion, while receiving sound signals from different positions in the sound field, converting them into electrical signals and inputting them into the detection system. Then, the sound field characteristic parameters and energy distribution information are obtained through signal processing and visualization techniques on a computer.

[0004] Chinese invention patent CN101398328A discloses an automated measurement device for the sound field of an ultrasonic immersion transducer, particularly suitable for measuring the sound field of ultrasonic immersion transducers. This sound field measurement device consists of a three-dimensional scanning frame, a sound-absorbing water tank, a reflector, an ultrasonic transducer frame, a data processor, a three-dimensional motion controller, and a stepper motor. The sound-absorbing water tank is located inside the three-dimensional scanning frame; the three-dimensional motion part of the three-dimensional scanning frame is above the sound-absorbing water tank; the reflector is located on the bottom surface of the sound-absorbing water tank, below the three-dimensional motion part of the three-dimensional scanning frame; the ultrasonic transducer frame is fixed to the three-dimensional scanning frame by threads; the data processor is connected to the ultrasonic transducer under test by a signal line; the three-dimensional motion controller is connected to the stepper motor by signal and power lines; the stepper motor is fixed to the three-dimensional scanning frame by threads. However, the non-multifunctional transducer clamping mechanism used in this document cannot meet the requirements of multi-purpose applications, and lacks a mechanical mechanism for conveniently adjusting the position of the ultrasonic transducer, making it difficult to easily complete the installation requirements of transducer alignment and centering, resulting in poor operability. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to provide an automatic calibration device for the acoustic field characteristics of an ultrasonic transducer based on the hydrophone method, which is convenient and quick to operate and has a reliable clamping effect.

[0006] This utility model is implemented as follows:

[0007] An automatic calibration device for the acoustic field characteristics of an ultrasonic transducer based on hydrophone method includes: a silencing water tank system, a manual five-degree-of-freedom motion mechanism, an electric five-degree-of-freedom motion mechanism, an ultrasonic transducer clamping bracket, and a standard hydrophone clamping bracket.

[0008] The silencing water tank system includes: an aluminum profile frame with crossbeams and retractable support columns; a water tank is installed above the bottom of the aluminum profile frame; a booster pump and a filter are respectively installed on the crossbeams and retractable support columns on the sides of the aluminum profile frame; and a sterilizer is installed on the crossbeam at the top of the aluminum profile frame.

[0009] The manual five-degree-of-freedom motion mechanism and the electric five-degree-of-freedom motion mechanism are respectively installed on both sides above the aluminum profile frame;

[0010] The manual five-degree-of-freedom motion mechanism is equipped with a connector. The ultrasonic transducer clamping bracket adopts a crab claw clamp and is connected to a connecting rod. The crab claw clamp clamps the ultrasonic transducer, and the other end of the connecting rod is installed on the connector.

[0011] The ultrasonic transducer is connected to a power amplifier, the other end of which is connected to a signal generator, the other end of which is connected to a computer. The computer is also connected to an oscilloscope and a motion control system. The other end of the oscilloscope is connected to a preamplifier and an auxiliary amplifier.

[0012] The standard hydrophone clamping bracket is mounted on an electric five-degree-of-freedom motion mechanism.

[0013] Furthermore, the manual five-degree-of-freedom motion mechanism includes: first and second Y-direction moving frames, a slider connected above the first and second Y-direction moving frames, first and second X-direction moving frames connected above the slider, a first Z-direction moving frame connected in the Z direction of the first and second X-direction moving frames, a first horizontal rotation axis connected to the tail end of the first Z-direction moving frame, and a first vertical rotary table connected below the first horizontal rotation axis.

[0014] Furthermore, the electric five-degree-of-freedom motion mechanism includes: a linear module and an electrically controlled rotary table;

[0015] The linear module includes: a third and a fourth X-direction moving frame, a third Y-direction moving frame slidably connected to the third and the fourth X-direction moving frame, and a second Z-direction moving frame connected to the third Y-direction moving frame in the Z direction. The linear module is connected to the motion control system.

[0016] The electrically controlled rotary table includes: a second horizontal rotation axis disposed at the tail end of the second Z-direction moving frame and a second vertical rotary table disposed below the second horizontal rotation axis;

[0017] Furthermore, the standard hydrophone clamping bracket adopts a thin cylindrical adjustable clamp, the front end of which clamps a needle-type hydrophone. The needle-type hydrophone is connected to the preamplifier and the auxiliary amplifier.

[0018] Furthermore, multiple pulleys are connected to the bottom of the aluminum profile frame.

[0019] This utility model has the following advantages:

[0020] 1. The newly designed transducer crab claw clamping mechanism and cylindrical hydrophone holder have the advantages of convenient and quick operation and reliable clamping effect, and are suitable for various types of sensors; the manual five-degree-of-freedom motion structure can easily adjust the transducer position and facilitate the transducer centering and installation operation.

[0021] 2. This device features a modular design, including a water tank system, a circulating water treatment system, and a standard hydrophone clamping bracket. It is based on an industrial control computer host system and integrates a five-dimensional sound field scanning system, an ultrasonic pulse excitation system, and a hydrophone sound pressure testing system. The system is easy to operate, has a simple and reliable structure, and excellent performance.

[0022] 3. The establishment of a five-dimensional automatic scanning measurement system for sound field space has enabled precise positioning and visualization of five-dimensional automatic scanning of sound field space, and can measure and visualize the characteristic parameters of the sound field generated by the transducer. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Figure 1 This is a schematic diagram of the device structure of this utility model.

[0025] Figure 2 This is a diagram showing the usage status of the device of this utility model.

[0026] Figure 3 This is a front view of the device of this utility model (excluding the pulley and acrylic water tank).

[0027] Figure 4 This is a front view of the electric five-degree-of-freedom motion system of this utility model.

[0028] Figure 5 This is a front view of the manual five-degree-of-freedom motion system of this utility model.

[0029] Figure 6This utility model Figure 1 Enlarged diagram of point A in the middle.

[0030] Figure 7 This is a block diagram showing the connection relationship of each device in the usage state of this utility model.

[0031] Reference numerals: 1. Silencing water tank system; 11. Aluminum profile frame; 12. Pulley; 13. Acrylic water tank; 2. Manual five-degree-of-freedom motion mechanism; 21. Connecting component; 22. First X-direction moving frame; 23. Second X-direction moving frame; 24. First Y-direction moving frame; 25. Second Y-direction moving frame; 26. First Z-direction moving frame; 27. First horizontal rotation axis; 28. First vertical rotary table; 29. ​​Slider; 3. Electric five-degree-of-freedom motion mechanism; 31. Straight Line module; 311, Third X-direction moving frame; 312, Fourth X-direction moving frame; 313, Third Y-direction moving frame; 314, Second Z-direction moving frame; 32, Electrically controlled rotary table; 321, Second horizontal rotating axis; 322, Second vertical rotary table; 4, Ultrasonic transducer clamping bracket; 41, Crab claw clamp; 42, Connecting rod; 5, Standard hydrophone clamping bracket; 6, Needle hydrophone; 7, Booster pump; 8, Filter; 9, Sterilizer; 10, Telescopic support column. Detailed Implementation

[0032] refer to Figures 1 to 7 This embodiment provides an automatic calibration device for the acoustic field characteristics of an ultrasonic transducer based on the hydrophone method. The device is characterized by including a silencing water tank system 1, a manual five-degree-of-freedom motion mechanism 2, an electric five-degree-of-freedom motion mechanism 3, an ultrasonic transducer clamping bracket 4, and a standard hydrophone clamping bracket 5.

[0033] The anechoic water tank system 1 includes: an aluminum profile frame 11 with crossbeams and telescopic support columns 10; the height of the aluminum profile frame 11 can be adjusted as needed via the telescopic support columns 10; four pulleys 12 are connected to the bottom of the aluminum profile frame 11; an acrylic water tank 13 is installed above the bottom of the aluminum profile frame 11; a booster pump 7 and a filter 8 are respectively installed on the crossbeams and telescopic support columns 10 on the sides of the aluminum profile frame 11; and a sterilizer 9 is installed on the crossbeam at the top front of the aluminum profile frame 11. This system provides a stable water environment to meet the requirements of the ultrasonic transducer sound field measurement method based on hydrophones, and also serves as the indirect mounting foundation for two sets of five-axis scanning motion systems.

[0034] The manual five-degree-of-freedom motion mechanism 2 and the electric five-degree-of-freedom motion mechanism 3 are respectively installed on both sides above the aluminum profile frame 11;

[0035] The manual five-degree-of-freedom motion mechanism 2 includes: first and second Y-direction moving frames (24, 25). A slider 29 is connected above the first and second Y-direction moving frames (24, 25). First and second X-direction moving frames (22, 23) are connected above the sliders 29. A first Z-direction moving frame 26 is connected in the Z-direction of the first and second X-direction moving frames (22, 23). A first horizontal rotation axis 27 is connected to the tail end of the first Z-direction moving frame 26. A first vertical rotary table 28 is connected below the first horizontal rotation axis 27. The manual five-degree-of-freedom motion mechanism 2 also includes a connecting piece 21. The ultrasonic transducer clamping bracket 4 uses a crab claw clamp 41 and is connected to a connecting rod 42. The crab claw clamp 41 can accommodate ultrasonic transducers of different diameters. The ultrasonic transducer is connected to a power amplifier. The other end of the power amplifier is connected to a signal generator. The other end of the signal generator is connected to a computer. The computer is also connected to an oscilloscope and a motion control system. The other end of the oscilloscope is connected to a preamplifier and an auxiliary amplifier (connection relationships are as follows). Figure 7 (As shown); the other end of the connecting rod 42 is installed on the connecting piece 21; the motion mechanism has the functions of adjusting the height and direction, so that the axis of the ultrasonic transducer under test is in the same straight line as the axis of the standard hydrophone; and the motion mechanism has the function of locking the fixed point position, which is used to keep the absolute position of the ultrasonic transducer unchanged during the test.

[0036] The electric five-degree-of-freedom motion mechanism 3 includes: a linear module 31 and an electrically controlled rotary table 32, used to drive a standard hydrophone to perform five-axis motion for sound field scanning;

[0037] The linear module 31 includes: third and fourth X-direction moving frames (311, 312), a third Y-direction moving frame 313 slidably connected to the third and fourth X-direction moving frames (311, 312), and a second Z-direction moving frame 314 connected to the third Y-direction moving frame 313 in the Z direction; one end of the linear module 31 is connected to the aforementioned motion control system (connection relationship as follows). Figure 7 (As shown).

[0038] The electrically controlled rotary table 32 includes: a second horizontal rotation shaft 321 disposed at the tail end of the second Z-direction moving frame 314 and a second vertical rotary table 322 disposed below the second horizontal rotation shaft 321;

[0039] The standard hydrophone clamp 5 uses a thin cylindrical adjustable clamp, which has the advantage of a low ultrasonic reflection cross-section, to clamp the needle-type hydrophone 6 and is connected to the electrically driven five-degree-of-freedom motion mechanism 3 to realize the spatial scanning motion of the standard hydrophone. The needle-type hydrophone 6 is connected to the aforementioned preamplifier and auxiliary amplifier (connection relationship as follows). Figure 7 (As shown).

[0040] The working principle of this utility model device is as follows:

[0041] The working principle of this automatic device is based on the hydrophone method to measure and image the sound field of an ultrasonic transducer. The user controls the electric five-degree-of-freedom motion mechanism 3 through the computer system to drive the standard hydrophone to perform five-axis motion for sound field scanning. At the same time, the standard hydrophone receives the sound pressure signals emitted by the ultrasonic transducer under test at different positions. The computer system reads the position parameters and sound pressure parameters simultaneously to form a six-dimensional parameter field (x,y,z,θ,φ,U), including three linear position information (x,y,z), two azimuth angle information (θ,φ), and sound pressure information (U). Through calculation and processing, the distribution of the transducer's sound field is intuitively represented in the form of images and data, thereby realizing the calibration of the ultrasonic transducer based on the hydrophone method.

[0042] The manual five-degree-of-freedom motion mechanism 2 provides a manual adjustment mechanism capable of realizing linear and angular displacement adjustment, with reliable mechanical structure, low cost, and simple operation. Its technical implementation includes three linear axes: two Y-axis HGH25CA-1040 linear motion frames (first Y-axis motion frame 24 and second Y-axis motion frame 25) mounted above the base plate, enabling manual movement along the Y-axis; two X-axis HGH25CA-840 linear motion frames (first X-axis motion frame 22 and second X-axis motion frame 23) mounted above the Y-axis slider 29, enabling manual movement along the X-axis; and two other X-axis motion frames (first X-axis motion frame 22 and second X-axis motion frame 23) mounted above the first X-axis motion frame 22 and second X-axis motion frame 23. A Z-axis-mounted HIWIN HK1140PE-S600 hand-cranked module (first Z-axis moving frame 26) on the moving frame 23 enables manual movement along the X-axis; two rotating axes include: a Y200RM manual angle rotary table (first horizontal rotating axis 27) customized by Beijing Jiangyun Optoelectronics installed at the tail end of the first Z-axis moving frame 26, enabling horizontal rotation; and a Y200RM manual angle rotary table (first vertical rotary table 28) installed below the horizontal deflection rotary table, enabling vertical rotation.

[0043] The electric five-degree-of-freedom motion mechanism 3 provides an electric adjustment mechanism capable of automatically adjusting linear and angular displacements, with a reliable mechanical structure and low cost. The electric five-degree-of-freedom motion mechanism 3 consists of a linear module 31 and an electrically controlled rotary table 32.

[0044] The IPC-610L industrial computer is responsible for managing the human-machine interface, setting linear and angular displacement motion control parameters, and monitoring motion status and position. A CL57D digital closed-loop stepper driver and a 60CME22X closed-loop servo motor form a linear displacement drive unit, while a DM542 digital two-phase stepper driver and a 42-H250C13 stepper motor form an angular displacement drive unit. The industrial computer sends motion control commands to the drivers via a motion controller, controlling the motors to drive the KK8610P linear module 31 or the Y200RA100 electrically controlled rotary table 32 to perform XYZ three-axis linear motion in the linear axis direction, and horizontal flipping and vertical pitching two-axis rotational motion in the rotation axis direction. This, in turn, drives the standard hydrophone clamp 5, on which the standard hydrophone is mounted, to perform linear or angular displacement motion, thereby realizing the five-degree-of-freedom scanning motion of the standard hydrophone.

[0045] The automatic calibration device for the acoustic field characteristics of an ultrasonic transducer based on the hydrophone method provided by this utility model can achieve the following effects:

[0046] 1. The newly designed transducer crab claw clamping mechanism and cylindrical hydrophone holder have the advantages of convenient and quick operation and reliable clamping effect, and are suitable for various types of sensors; the manual five-degree-of-freedom motion structure can easily adjust the transducer position and facilitate the transducer centering and installation operation.

[0047] 2. This device features a modular design, including a water tank system, a circulating water treatment system, and a standard hydrophone clamping bracket. It is based on an industrial control computer host system and integrates a five-dimensional sound field scanning system, an ultrasonic pulse excitation system, and a hydrophone sound pressure testing system. The system is easy to operate, has a simple and reliable structure, and excellent performance.

[0048] 3. The establishment of a five-dimensional automatic scanning measurement system for sound field space has enabled precise positioning and visualization of five-dimensional automatic scanning of sound field space, and can measure and visualize the characteristic parameters of the sound field generated by the transducer.

[0049] While specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and not intended to limit the scope of the present invention. Equivalent modifications and variations made by those skilled in the art in accordance with the spirit of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. An apparatus for automatic calibration of the acoustic field characteristics of an ultrasonic transducer based on hydrophone method, characterized in that: The application relates to a sound-absorbing water tank system, a manual five-degree-of-freedom motion mechanism, an electric five-degree-of-freedom motion mechanism, an ultrasonic transducer clamping support and a standard hydrophone clamping support. The sound-absorbing water tank system comprises an aluminum profile rack provided with a cross beam and telescopic supporting columns, a water tank is arranged above the bottom of the aluminum profile rack, a booster water pump and a filter are arranged on the cross beam and the telescopic supporting columns of the side of the aluminum profile rack respectively, and a sterilizer is arranged on the cross beam of the top of the aluminum profile rack. The manual five-degree-of-freedom motion mechanism and the electric five-degree-of-freedom motion mechanism are respectively arranged on the two sides above the aluminum profile rack. A connecting piece is arranged on the manual five-degree-of-freedom motion mechanism, a crab clamp is used for clamping an ultrasonic transducer, and a connecting rod is connected to the crab clamp and arranged on the connecting piece. A power amplifier is connected to the ultrasonic transducer, a signal generator is connected to the other end of the power amplifier, a computer is connected to the other end of the signal generator, an oscilloscope and a motion control system are further connected to the computer, a preamplifier and an auxiliary amplifier are connected to the other end of the oscilloscope. The standard hydrophone clamping support is arranged on the electric five-degree-of-freedom motion mechanism. The manual five-degree-of-freedom motion mechanism comprises first and second Y-direction moving frames, sliders connected above the first and second Y-direction moving frames, first and second X-direction moving frames connected above the sliders, a first Z-direction moving frame connected in the Z direction of the first and second X-direction moving frames, a first horizontal rotating shaft connected to the tail end of the first Z-direction moving frame and a first vertical rotary rotating table connected below the first horizontal rotating shaft.

2. The device for automatic calibration of the ultrasonic transducer sound field characteristics based on the hydrophone method according to claim 1, characterized in that: The electric five-degree-of-freedom motion mechanism comprises a linear module and an electric control rotary table.

3. The device for automatic calibration of the ultrasonic transducer sound field characteristics based on the hydrophone method according to claim 2, characterized in that: The linear module comprises third and fourth X-direction moving frames, a third Y-direction moving frame slidingly connected to the third and fourth X-direction moving frames, a second Z-direction moving frame connected in the Z direction of the third Y-direction moving frame, and the linear module is connected with the motion control system. The electric control rotary table comprises a second horizontal rotating shaft arranged at the tail end of the second Z-direction moving frame and a second vertical rotary rotating table arranged below the second horizontal rotating shaft. The standard hydrophone clamping support adopts a thin cylindrical adjustable holder, a needle hydrophone is clamped at the front end of the thin cylindrical adjustable holder, and the needle hydrophone is connected with the preamplifier and the auxiliary amplifier.

4. The device for automatic calibration of the ultrasonic transducer sound field characteristics based on the hydrophone method according to claim 1, characterized in that: A plurality of pulleys are connected below the bottom of the aluminum profile rack.

5. The device for automatic calibration of the ultrasonic transducer sound field characteristics based on the hydrophone method according to claim 1, characterized in that: ​

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