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System and method for measuring longitudinal wave sound velocity distribution of material

A technology of sound velocity and longitudinal wave, which is applied in the direction of using sound wave/ultrasonic wave/infrasonic wave to analyze solids, analyze materials, and process detection response signals. It can solve problems such as size or structure restrictions, difficult geometric measuring tools to obtain thickness information, etc., and achieve efficient and reliable methods. Effect

Pending Publication Date: 2022-03-01
上海船舶工程质量检测有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For small samples, the thickness value can usually be obtained intuitively through geometric measuring tools, so the above method is simple and easy; however, for some samples with large sizes or complex structures, the implementation of this method may be limited by the size or structure of the workpiece , but it is difficult to obtain its thickness information through geometric measuring tools

Method used

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  • System and method for measuring longitudinal wave sound velocity distribution of material
  • System and method for measuring longitudinal wave sound velocity distribution of material
  • System and method for measuring longitudinal wave sound velocity distribution of material

Examples

Experimental program
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Effect test

Embodiment 1

[0060] The above-mentioned system and method are used to measure the sound velocity distribution of the material when the workpiece is perpendicular to the main direction of longitudinal wave propagation. The object to be tested is a steel plate with unknown thickness and sound velocity, the coupling liquid is water, the sound velocity of the longitudinal wave is 1483m / s, the distance between the transmitting transducer and the receiving transducer is 100mm, and the nominal frequency of the transducer is 2.25MHz. When there is no workpiece between the transmitting transducer and the receiving transducer, record the time t for the sound wave to travel from the transmitting transducer to the receiving transducer 0 =67.4μs; place the workpiece to be measured at a distance of about 30mm from the transmitting transducer, re-excite and receive the signal, capture the direct penetrating wave and the penetrating wave reflected twice in the workpiece, and record the time t respectively ...

Embodiment 2

[0065] Using the above-mentioned system angle longitudinal wave workpiece sound velocity detection, the object to be inspected is an unknown thick aluminum plate, the coupling liquid is water, the longitudinal wave sound velocity is 1483m / s, the distance between the transmitting transducer and the receiving transducer is 100mm, and the nominal value of the transducer is The frequency is 2.25MHz. When there is no workpiece between the transmitting transducer and the receiving transducer, record the time t for the sound wave to travel from the transmitting transducer to the receiving transducer 0 =67.4μs, place the workpiece to be measured at a distance of about 30mm from the transmitting transducer, record the offset angle of the workpiece at 2°, re-excite and receive the signal, and capture the direct penetrating wave and the penetrating wave after two reflections in the workpiece Through the wave, record the time t 1 = 46.8μs, t 2 = 59.6μs,

[0066] Then according to the f...

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Abstract

The invention provides a system and method for measuring longitudinal wave sound velocity distribution of a material, and the system comprises an ultrasonic signal transmitting and receiving unit, a to-be-detected workpiece, an ultrasonic liquid coupling unit, a plane scanning mechanism and a signal processing and display unit, the ultrasonic signal transmitting and receiving unit comprises an ultrasonic transmitting transducer, an ultrasonic receiving transducer and an ultrasonic signal collection device; the plane scanning mechanism is connected with a to-be-detected workpiece or is respectively connected with the ultrasonic transmitting transducer and the ultrasonic receiving transducer, so that the ultrasonic transmitting transducer and the ultrasonic receiving transducer are relatively static and move relative to the workpiece, and the ultrasonic liquid coupling unit comprises coupling liquid and a container for storing the coupling liquid; under the condition that the thickness distribution of the workpiece in the detected point or the detected area is not predicted, the longitudinal wave sound velocity and the distribution condition of the longitudinal wave sound velocity of the workpiece can be conveniently and rapidly measured, and a high-precision, efficient and reliable method is provided for rapidly knowing the sound velocity and the distribution condition of the material.

Description

technical field [0001] The invention relates to the technical field of non-destructive testing, in particular to a system and method for measuring the longitudinal wave sound velocity distribution of materials. Background technique [0002] Material sound velocity is the speed of sound waves propagating in materials, and it is also an intuitive representation of the consistency of material properties. Therefore, using a specific method to measure the longitudinal wave sound velocity distribution of materials can quickly determine the internal consistency of materials. [0003] The commonly used method of measuring the sound velocity of materials often needs to predict the thickness of the material, and according to a certain process, select a specific acoustic wave signal, measure the time for the sound wave to travel within a known distance, and then calculate the sound velocity of the material. [0004] For small samples, the thickness value can usually be obtained intuiti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/07G01N29/44
CPCG01N29/07G01N29/44G01N2291/011G01N2291/023G01N2291/0421
Inventor 周昌智谢新黄凯华易一平黄燕琳吉宏林刘思明丁兵张天财赵琼
Owner 上海船舶工程质量检测有限公司