Sound velocity-attenuation coefficient integrated detection method for polymer

A technology of attenuation coefficient and detection method, which is applied in the detection field to achieve the effects of convenient calculation, easy online monitoring and simple operation

Active Publication Date: 2018-11-27
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problems of existing detection methods, the present invention proposes an integrated detection method of ultrasonic sound velocity and attenuation coefficient based on ultrasonic propagation theory, which can be used for online monitoring with high precision

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  • Sound velocity-attenuation coefficient integrated detection method for polymer
  • Sound velocity-attenuation coefficient integrated detection method for polymer
  • Sound velocity-attenuation coefficient integrated detection method for polymer

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Embodiment Construction

[0043] In order to make the present invention more clearly understood, the present invention will be further described below according to specific examples and accompanying drawings of the present invention.

[0044] Such as figure 1 Shown is the schematic diagram of ultrasonic detection of the present invention, including ultrasonic probe 1, container 2, water 3, and sample 4.

[0045] Ultrasonic testing methods for plastic parts, including:

[0046] Place the sample in a container filled with water.

[0047] Use a water immersion ultrasonic probe to emit pulse waves with a certain center frequency. When testing, ensure that the ultrasonic probe is facing the upper surface of the sample.

[0048] Use an oscilloscope to collect the reflected echoes from the upper and lower surfaces of the receiving sample.

[0049] Calculate the frequency spectrum of the reflected echoes from the upper and lower surfaces of the sample according to the Fourier transform.

[0050] Make a gr...

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Abstract

The invention discloses a sound velocity-attenuation coefficient integrated detection method for a polymer. The method is characterized by comprising the following steps: (1) allowing an ultrasonic probe to emit ultrasonic waves directly towards a to-be-detected sample; (2) collecting reflection echoes on the upper and lower surfaces of the sample, and calculating amplitude spectrums of the reflection echoes, wherein one side, directly facing the ultrasonic probe, of the sample is defined as the upper surface, and one side, opposite to the ultrasonic probe, of the sample is defined as the lower surface; and (3) calculating an ultrasonic transmission speed of the to-be-detected sample, the thickness of the sample and the attenuation coefficient of the sample according to the amplitude spectrums of the reflection echoes. The detection method is easy in operation, convenient in calculation and low in detection cost, the tested sample is not damaged, the online monitoring can be easily realized, and the sound speed, attenuation coefficient and wall thickness of a polymer part can be simultaneously detected.

Description

technical field [0001] The invention belongs to the technical field of detection methods, and in particular relates to an integrated detection method of sound velocity and attenuation coefficient in polymers. Background technique [0002] Polymer parts are mostly formed by injection molding, and the propagation speed and attenuation coefficient of ultrasonic waves in them are important indicators of their microstructure. The speed of sound can characterize the degree of crystallinity and orientation of polymer parts, and the attenuation coefficient is closely related to the grain size of crystalline parts. For the sound velocity of polymer parts, currently the transit time method is mainly used to measure the sound velocity, that is, to measure the wall thickness of the part and the ultrasonic propagation time to calculate the sound velocity; for the attenuation coefficient, the current calculation is mainly based on the amplitude of the echo signal combined with the definit...

Claims

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Application Information

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IPC IPC(8): G01N29/11G01N29/07
CPCG01N29/07G01N29/11G01N2291/011G01N2291/015G01N2291/044
Inventor 赵朋夏能赵耀张剑锋黄俊业傅建中
Owner ZHEJIANG UNIV
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