CN214097283U - System for measuring attenuation coefficients of super surface acoustic waves at different temperatures - Google Patents
System for measuring attenuation coefficients of super surface acoustic waves at different temperatures Download PDFInfo
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- CN214097283U CN214097283U CN202022605788.2U CN202022605788U CN214097283U CN 214097283 U CN214097283 U CN 214097283U CN 202022605788 U CN202022605788 U CN 202022605788U CN 214097283 U CN214097283 U CN 214097283U
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Abstract
The utility model discloses a survey system of super surface acoustic wave attenuation coefficient under different temperatures, including survey test block, ultrasonic transducer, data processor, ultrasonic instrument and temperature control box, wherein, ultrasonic transducer places in the one end of survey test block, and the other end of survey test block is the echelonment structure, the echelonment structure is located the temperature control box, and ultrasonic instrument is connected with ultrasonic transducer and data processor, and ultrasonic transducer arouses the surface acoustic wave and enters into survey test block upper surface from the plane of flattening, warp again in entering into ultrasonic surface acoustic wave transducer behind the echelonment structure reflection, this system can the accurate attenuation coefficient of measuring surface acoustic wave under different work pieces and temperature.
Description
Technical Field
The utility model relates to a survey attenuation coefficient's system, concretely relates to survey system of super surface acoustic wave attenuation coefficient under different temperatures.
Background
Ultrasonic surface waves are widely used in the detection of defects on and near the surface of workpieces because of their high efficiency and high sensitivity. Ultrasonic surface waves are one type of ultrasonic waves, and ultrasonic energy is attenuated when propagating in a medium due to beam spreading, grain scattering, and medium absorption. The attenuation caused by beam diffusion is only related to the shape of a wave front, plane waves cannot be attenuated by diffusion, cylindrical waves and spherical waves reduce sound pressure along with the increase of diffusion distance, and the attenuation caused by grain scattering and medium absorption is ubiquitous in the ultrasonic wave propagation process. In addition, dislocations, magnetic domain walls, residual stress, and the like in the propagation medium also cause attenuation of the ultrasonic wave. Obtaining the attenuation coefficient of the ultrasonic wave is of great significance for mastering the propagation characteristics of the ultrasonic wave in a medium and better utilizing the ultrasonic wave to carry out actual detection work.
At present, the attenuation coefficient of ultrasonic waves is measured by using a thin plate workpiece and a thick plate or thick cylinder workpiece, and is used for measuring the attenuation coefficient of ultrasonic longitudinal waves. For the attenuation coefficient measurement of the thin plate, the diffusion attenuation is not considered, the attenuation coefficient of the ultrasonic longitudinal wave is calculated by utilizing the amplitude difference between multiple bottom waves and the plate thickness, the method requires that the upper surface and the lower surface of the thin plate are smooth and parallel to each other, and the diffusion attenuation is not considered. For the attenuation coefficient measurement of a thick plate or a thick cylinder, the attenuation coefficient of the ultrasonic longitudinal wave is calculated by using the amplitude difference between the primary bottom wave and the secondary bottom wave and the plate thickness, and the method processes the diffusion attenuation in an estimation mode. The ultrasonic energy loss caused by reflection is processed in an estimation mode by the two methods, and the determination accuracy is further improved.
In summary, the method for measuring the attenuation coefficient of the ultrasonic wave is mainly based on the multiple reflection bottom wave of the longitudinal wave passing through the workpiece and reaching the bottom surface, and no relevant report about the method for measuring the attenuation coefficient of the ultrasonic surface wave is found. Ultrasonic surface wave can only be followed solid medium surface two times wavelength depth within range and spread, therefore passes the method of work piece through the longitudinal wave at present and is not suitable for the survey of ultrasonic surface wave attenuation coefficient, the utility model discloses can accurately survey ultrasonic surface wave attenuation coefficient under the different temperatures.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned prior art not enough, provide a system of super surface acoustic wave attenuation coefficient under survey different temperatures, this system can accurate measurement surface acoustic wave attenuation coefficient under different work pieces and temperature.
In order to achieve the above object, the system for measuring attenuation coefficient of ultra-sound surface wave at different temperatures comprises a measuring test block, an ultrasonic transducer, a data processor, an ultrasonic instrument and a temperature control box, wherein the ultrasonic transducer is arranged on the upper surface of one end of the measuring test block, the other end of the measuring test block is a step-shaped structure, the step-shaped structure is arranged in the temperature control box, the ultrasonic instrument is connected with the ultrasonic transducer and the data processor, the ultrasonic surface wave excited by the ultrasonic transducer enters the upper surface of the measuring test block from the flat surface, and then passes through the step-shaped structure after being reflected to enter the ultrasonic surface transducer.
The length of the test block is 800-1200 mm.
The width of each step is 10-30mm, and the thickness of each step is 5-20 mm.
The number of the ultrasonic transducers is 1, and the frequency of the ultrasonic transducers is 0.5-5 MHz.
The utility model discloses following beneficial effect has:
survey system of surpassing surface acoustic wave attenuation coefficient under different temperatures when concrete operation, choose for use one end level and smooth, the other end is the survey test block of echelonment structure, when the test, will survey the test block through temperature control deviceAdjusting the temperature of the stepped structure part to be measured and keeping the temperature constant, then exciting an ultrasonic surface wave at one end of the test block by using an ultrasonic transducer, and transmitting the ultrasonic surface wave to the upper surface of the test block along a direction perpendicular to one end of the flat surface of the test blockiAnd the reflected wave reaches the end face of the stepped structure and is received by the ultrasonic transducer, the gain of the ultrasonic instrument is adjusted to enable the amplitude of the echo wave to be 80% of the full screen, the gain value at the moment is recorded, the data processor can obtain the attenuation coefficient of the ultrasonic surface wave, and then the attenuation coefficient of the ultrasonic surface wave under different workpieces and temperatures is accurately measured, so that the operation is convenient and simple.
Drawings
Fig. 1 is a schematic structural view of the present invention;
wherein, 1 is a test block, 2 is an ultrasonic transducer, 3 is a data processor, 4 is an ultrasonic instrument, and 5 is a temperature control box.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings:
referring to fig. 1, system of super surface acoustic wave attenuation coefficient under the different temperatures of survey including survey test block 1, ultrasonic transducer 2, data processor 3, ultrasonic instrument 4 and temperature control box 5, wherein, ultrasonic transducer 2 places on the upper surface of survey test block 1 one end, and the other end of survey test block 1 is the echelonment structure, the echelonment structure is located temperature control box 5, and the ultrasonic surface wave that ultrasonic transducer 2 arouses enters into survey test block 1 upper surface from the plane of flattening, passes through again in entering into ultrasonic surface acoustic wave transducer 2 behind the echelonment structure reflection.
The length of the test block 1 is 800-1200mm, the width of each step in the test block 1 is 10-30mm, and the thickness of each step is 5-20 mm.
The number of the ultrasonic transducers 2 is 1, and the frequency of the ultrasonic transducers 2 is 0.5-5 MHz.
The utility model discloses a concrete working process does:
1) adjusting the temperature of the stepped structure to a temperature to be measured and keeping the temperature constant;
2) exciting an ultrasonic surface wave by using an ultrasonic transducer 2, wherein the ultrasonic surface wave propagates on the upper surface of the test block 1 along a direction vertical to one end of the flat surface of the test block 1iThe echo wave amplitude is 80% of full screen by adjusting the gain of the ultrasonic instrument 4, and the gain value B is recorded at the momenti；
3) The data processor 3 calculates and obtains the attenuation coefficient of the super surface acoustic wave
Wherein liThe amplitude of the echo of the ultrasonic surface wave is measured as the amplitude of the echo at the peak position, which is half of the propagation distance of the ultrasonic surface wave.
Claims (6)
1. The system for measuring the attenuation coefficient of the ultra-surface acoustic wave at different temperatures is characterized by comprising a measuring test block (1), an ultrasonic transducer (2), a data processor (3), an ultrasonic instrument (4) and a temperature control box (5), wherein the ultrasonic transducer (2) is placed on the upper surface of one end of the measuring test block (1), the other end of the measuring test block (1) is of a stepped structure, the stepped structure is located in the temperature control box (5), the ultrasonic instrument (4) is connected with the ultrasonic transducer (2) and the data processor (3), and an ultrasonic surface wave excited by the ultrasonic transducer (2) enters the upper surface of the measuring test block (1) from a flat surface and then enters the ultrasonic transducer (2) after being reflected by the stepped structure.
2. The system for measuring the attenuation coefficient of ultra surface acoustic wave at different temperatures as set forth in claim 1, wherein the length of the measuring block (1) is 800-1200 mm.
3. The system for measuring the attenuation coefficient of an ultra surface acoustic wave at different temperatures as set forth in claim 1, wherein the width of each step in the measurement block (1) is 10-30 mm.
4. The system for measuring the attenuation coefficient of a super surface acoustic wave at different temperatures as set forth in claim 1, wherein the thickness of each step is 5-20 mm.
5. The system for measuring the attenuation coefficient of an ultrasonic surface acoustic wave at different temperatures according to claim 1, wherein the number of the ultrasonic transducers (2) is 1.
6. The system for measuring the attenuation coefficient of an ultrasonic surface acoustic wave at different temperatures as set forth in claim 1, wherein the frequency of the ultrasonic transducer (2) is 0.5-5 MHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022605788.2U CN214097283U (en) | 2020-11-11 | 2020-11-11 | System for measuring attenuation coefficients of super surface acoustic waves at different temperatures |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022605788.2U CN214097283U (en) | 2020-11-11 | 2020-11-11 | System for measuring attenuation coefficients of super surface acoustic waves at different temperatures |
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| Publication Number | Publication Date |
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| CN214097283U true CN214097283U (en) | 2021-08-31 |
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| CN202022605788.2U Active CN214097283U (en) | 2020-11-11 | 2020-11-11 | System for measuring attenuation coefficients of super surface acoustic waves at different temperatures |
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| Country | Link |
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| CN (1) | CN214097283U (en) |
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- 2020-11-11 CN CN202022605788.2U patent/CN214097283U/en active Active
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