CN213398350U - System for measuring ultrasonic longitudinal wave attenuation coefficients at different temperatures - Google Patents
System for measuring ultrasonic longitudinal wave attenuation coefficients at different temperatures Download PDFInfo
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- CN213398350U CN213398350U CN202022605105.3U CN202022605105U CN213398350U CN 213398350 U CN213398350 U CN 213398350U CN 202022605105 U CN202022605105 U CN 202022605105U CN 213398350 U CN213398350 U CN 213398350U
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Abstract
The utility model discloses a system for measuring the attenuation coefficient of ultrasonic longitudinal wave at different temperatures, which comprises an ultrasonic longitudinal wave transducer, a measuring test block, a data processor, an ultrasonic instrument and a temperature control box; the ultrasonic longitudinal wave transducers are positioned at the top of the test block, the cross section of the bottom of the test block is of a stepped structure, the ultrasonic longitudinal waves generated by the ultrasonic longitudinal wave transducers are transmitted to the lower end face of the test block along the direction perpendicular to the upper end face of the test block, the ultrasonic longitudinal wave transducers are connected with an ultrasonic instrument, the ultrasonic instrument is connected with a data processor, the stepped structure is positioned in the temperature control box, and the system can accurately measure the attenuation coefficients of the ultrasonic longitudinal waves at different workpieces and temperatures.
Description
Technical Field
The utility model relates to a system for survey attenuation coefficient, concretely relates to system for survey ultrasonic longitudinal wave attenuation coefficient under different temperatures.
Background
Ultrasonic longitudinal waves belong to a type of ultrasonic waves, and ultrasonic energy is attenuated due to beam diffusion, grain scattering and medium absorption when the ultrasonic longitudinal waves propagate in a medium. 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, 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 addition, the conventional method for measuring the attenuation coefficient of the ultrasonic longitudinal wave mainly comprises the multiple reflection bottom wave that the longitudinal wave passes through a workpiece to reach the bottom surface at normal temperature, the attenuation of the ultrasonic longitudinal wave is different at different temperatures, particularly the attenuation of the ultrasonic wave is increased at high temperature, the energy is difficult to meet the measurement requirement when an indirect coupling method is used, a special high-temperature ultrasonic longitudinal wave transducer is required when a direct coupling method is used, and the temperature uniformity of a part to be measured is difficult to control due to the existence of a coupling agent, so that the conventional method for measuring the attenuation coefficient of the ultrasonic longitudinal wave is not suitable for measuring the attenuation coefficient of the ultrasonic longitudinal wave at high temperature.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned prior art not enough, provide a system of supersound longitudinal wave attenuation coefficient under survey different temperatures, this system can accurate measurement supersound longitudinal wave attenuation coefficient under different work pieces and temperature.
In order to achieve the above purpose, the system for measuring the attenuation coefficient of the longitudinal ultrasonic wave at different temperatures of the utility model comprises an ultrasonic longitudinal wave transducer, a measuring test block, a data processor, an ultrasonic instrument and a temperature control box;
the ultrasonic longitudinal wave transducers are positioned at the top of the measuring test block, the cross section of the bottom of the measuring test block is of a stepped structure, the ultrasonic longitudinal waves generated by the ultrasonic longitudinal wave transducers are transmitted to the lower end face of the measuring test block along the direction perpendicular to the upper end face of the measuring test block, the ultrasonic longitudinal wave transducers are connected with an ultrasonic instrument, the ultrasonic instrument is connected with a data processor, and the stepped structure is positioned in the temperature control box.
Each step surface in the test block is of a rectangular structure.
The length of the test block is 800-.
The width of each step surface in the test block is 30-300 mm.
The thickness of each step surface in the test block is 30-300 mm.
The upper end surface and the lower end surface of the test block are parallel.
The number of the ultrasonic longitudinal wave transducers is 1, and the frequency of the ultrasonic longitudinal wave transducers is 0.5-10 MHz
The utility model discloses following beneficial effect has:
survey system of ultrasonic longitudinal wave attenuation coefficient under different temperatures when concrete operation, the up end of survey test block is the burnishing surface, the lower terminal surface of survey test block is the echelonment structure, when the test, through the temperature control box with survey the temperature regulation of terminal surface under the test to the temperature that awaits measuring, recycle ultrasonic longitudinal wave transducer and arouse ultrasonic longitudinal wave, and along the direction of perpendicular to survey test block up end to survey terminal surface propagation under the test block, then return to among the ultrasonic longitudinal wave transducer after the lower terminal surface reflection of survey test block, gain through adjusting ultrasonic instrument, make the echo wave amplitude be 80% full screen, record different propagation distance's gain value, data processor can obtain ultrasonic longitudinal wave attenuation coefficient with this, then accurate measurement ultrasonic longitudinal wave attenuation coefficient under different work pieces and temperature, and is convenient for operation and simple.
Drawings
FIG. 1 is a schematic diagram of a measurement system according to the present invention;
wherein, 1 is an ultrasonic longitudinal transducer, 2 is a test block, 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, the system for measuring the attenuation coefficient of longitudinal ultrasonic waves at different temperatures of the present invention includes a longitudinal ultrasonic transducer 1, a measurement test block 2, a data processor 3, an ultrasonic instrument 4 and a temperature control box 5; the ultrasonic longitudinal wave transducer 1 is positioned at the top of the measuring test block 2, the cross section of the bottom of the measuring test block 2 is of a stepped structure, the ultrasonic longitudinal wave generated by the ultrasonic longitudinal wave transducer 1 is transmitted to the lower end face of the measuring test block 2 along the direction perpendicular to the upper end face of the measuring test block 2, the ultrasonic longitudinal wave transducer 1 is connected with an ultrasonic instrument 4, the ultrasonic instrument 4 is connected with the data processor 3, and the stepped structure is positioned in the temperature control box 5.
Each step surface in the test block 2 is of a rectangular structure; the length of the test block 2 is 800-; the width of each step surface is 30-300 mm; the thickness of each step surface is 30-300 mm.
The upper end surface and the lower end surface of the test block 2 are parallel; the number of the ultrasonic longitudinal wave transducers 1 is 1, and the frequency of the ultrasonic longitudinal wave transducers 1 is 0.5-10 MHz
The utility model discloses a working process does:
1) adjusting the temperature of the lower end face of the test block 2 to be measured through a temperature control box 5, and keeping the temperature constant;
2) placing an ultrasonic longitudinal wave transducer 1 on the upper end surface of a measuring test block 2, exciting by using the ultrasonic longitudinal wave transducer 1 to generate ultrasonic longitudinal waves, transmitting the ultrasonic longitudinal waves to the lower end surface of the measuring test block 2 along the direction vertical to the upper end surface of the measuring test block 2, reflecting the ultrasonic longitudinal waves by the lower end surface of the measuring test block 2, then injecting the ultrasonic longitudinal waves into the ultrasonic longitudinal wave transducer 1, adjusting the gain of an ultrasonic instrument 4 to enable the amplitude of echo waves to be 80% full screen, and recording a gain value B at the momenti；
3) The data processor 3 calculates and obtains the attenuation coefficient of the ultrasonic longitudinal wave
liI is half the propagation distance of the longitudinal ultrasonic wave, i is 1,2, n.
The distance from any side wall of the test block 2 to the axis of the main sound beam to be measured
Wherein lmaxTo measure the maximum length of the test block 2, f is the frequency of the longitudinal ultrasonic transducer 1 used to measure the attenuation coefficient.
The upper end face and the lower end face of the test block 2 are parallel.
The number of the ultrasonic longitudinal wave transducers 1 is 1, and the frequency of the ultrasonic longitudinal wave transducers 1 is 0.5-10 MHz.
The amplitude of the ultrasonic longitudinal wave echo is the amplitude of the echo at the peak position.
Claims (8)
1. A system for measuring the attenuation coefficient of longitudinal ultrasonic waves at different temperatures is characterized by comprising an ultrasonic longitudinal wave transducer (1), a measuring test block (2), a data processor (3), an ultrasonic instrument (4) and a temperature control box (5);
the ultrasonic longitudinal wave transducer (1) is positioned at the top of the measuring test block (2), the cross section of the bottom of the measuring test block (2) is of a stepped structure, the ultrasonic longitudinal wave generated by the ultrasonic longitudinal wave transducer (1) is transmitted to the lower end face of the measuring test block (2) along the direction perpendicular to the upper end face of the measuring test block (2), the ultrasonic longitudinal wave transducer (1) is connected with an ultrasonic instrument (4), the ultrasonic instrument (4) is connected with a data processor (3), and the stepped structure is positioned in a temperature control box (5).
2. The system for measuring the attenuation coefficient of the longitudinal ultrasonic waves at different temperatures according to claim 1, wherein each step surface in the measuring test block (2) is of a rectangular structure.
3. The system for determining the attenuation coefficient of longitudinal ultrasonic waves at different temperatures as set forth in claim 2, wherein the length of the test block (2) is 800-1200 mm.
4. The system for measuring the attenuation coefficient of the longitudinal ultrasonic waves at different temperatures according to claim 2, wherein the width of each step surface in the test block (2) is 30-300 mm.
5. The system for measuring the attenuation coefficient of the longitudinal ultrasonic waves at different temperatures according to claim 2, wherein the thickness of each step surface in the test block (2) is 30-300 mm.
6. The system for measuring the attenuation coefficient of longitudinal ultrasonic waves at different temperatures according to claim 1, wherein the upper end surface and the lower end surface of the test block (2) are parallel.
7. System for determining the attenuation coefficient of longitudinal ultrasonic waves at different temperatures according to claim 1, characterized in that the number of longitudinal ultrasonic transducers (1) is 1.
8. The system for measuring the attenuation coefficient of the longitudinal ultrasonic wave at different temperatures according to claim 1, wherein the frequency of the longitudinal ultrasonic transducer (1) is 0.5-10 MHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022605105.3U CN213398350U (en) | 2020-11-11 | 2020-11-11 | System for measuring ultrasonic longitudinal wave attenuation coefficients at different temperatures |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022605105.3U CN213398350U (en) | 2020-11-11 | 2020-11-11 | System for measuring ultrasonic longitudinal wave attenuation coefficients at different temperatures |
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| Publication Number | Publication Date |
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| CN213398350U true CN213398350U (en) | 2021-06-08 |
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| CN202022605105.3U Active CN213398350U (en) | 2020-11-11 | 2020-11-11 | System for measuring ultrasonic longitudinal wave attenuation coefficients at different temperatures |
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- 2020-11-11 CN CN202022605105.3U patent/CN213398350U/en active Active
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