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Method and instrument capable of accurately measuring thickness of ultrathin workpieces

A technology for precise measurement of workpieces, applied in instruments, measuring devices, using ultrasonic/sonic/infrasonic waves, etc., to solve the problems of inability to obtain the thickness of the object to be measured, the thickness of the workpiece cannot be measured, and the time interval cannot be measured.

Inactive Publication Date: 2009-12-30
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the thickness of the measured object is thin to a certain extent, two adjacent echoes overlap, and the time interval between them cannot be measured, so the thickness of the measured object cannot be obtained.
Due to the large curvature of the workpiece, the ultrasonic reflection echo signal is weak, and the echo series cannot be formed, and the thickness of the workpiece cannot be measured
Therefore, for ultra-thin workpieces, especially ultra-thin workpieces with large curvature, the existing ultrasonic echo instruments are powerless

Method used

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  • Method and instrument capable of accurately measuring thickness of ultrathin workpieces
  • Method and instrument capable of accurately measuring thickness of ultrathin workpieces
  • Method and instrument capable of accurately measuring thickness of ultrathin workpieces

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Embodiment 1

[0031] The invention provides a method capable of accurately measuring the thickness of an ultra-thin workpiece, which is characterized in that: the method for accurately measuring the thickness of an ultra-thin workpiece adopts a signal processing method to extract ultrasonic information representing the thickness of the workpiece, which is suitable for measuring ultra-thin large curvature The thickness of the workpiece is also suitable for the ultrasonic thickness measurement technology for measuring the thickness of ordinary workpieces. Its core is to perform fast Fourier transform (FFT) on the received echo signal to obtain the measurement results; the ultrasonic pulse has a certain frequency range, see image 3 , when the measured object is thin, the adjacent echoes overlap together, which will inevitably produce interference phenomenon. The ultrasonic vibrations of certain frequencies strengthen each other, while the ultrasonic vibrations of other frequencies weaken or comp...

Embodiment 2

[0052] The invention provides a method capable of accurately measuring the thickness of an ultra-thin workpiece, which is characterized in that: the method for accurately measuring the thickness of an ultra-thin workpiece adopts a signal processing method to extract ultrasonic information representing the thickness of the workpiece, which is suitable for measuring ultra-thin large curvature The thickness of the workpiece is also suitable for the ultrasonic thickness measurement technology for measuring the thickness of ordinary workpieces. Its core is to perform fast Fourier transform (FFT) on the received echo signal to obtain the measurement results; the ultrasonic pulse has a certain frequency range, see figure 1 , when the measured object is thin, the adjacent echoes overlap together, which will inevitably produce interference phenomenon. The ultrasonic vibrations of certain frequencies strengthen each other, while the ultrasonic vibrations of other frequencies weaken or co...

Embodiment 3

[0073] The invention provides a method capable of accurately measuring the thickness of an ultra-thin workpiece, which is characterized in that: the method for accurately measuring the thickness of an ultra-thin workpiece adopts a signal processing method to extract ultrasonic information representing the thickness of the workpiece, which is suitable for measuring ultra-thin large curvature The thickness of the workpiece is also suitable for the ultrasonic thickness measurement technology for measuring the thickness of ordinary workpieces. Its core is to perform fast Fourier transform (FFT) on the received echo signal to obtain the measurement results; the ultrasonic pulse has a certain frequency range, see figure 1 , when the measured object is thin, the adjacent echoes overlap together, which will inevitably produce interference phenomenon. The ultrasonic vibrations of certain frequencies strengthen each other, while the ultrasonic vibrations of other frequencies weaken each ...

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Abstract

The invention provides a method capable of accurately measuring the thickness of ultrathin workpieces. As the ultrasonic information representing workpiece thickness is extracted by adopting a signal processing method, the invention is suitable for the ultrasonic thickness measurement technique for both ultrathin large-curvature workpieces and common workpieces, and the core of the invention is to perform fast Fourier transform on received echo signals so as to obtain measurement results. An instrument using the method capable of accurately measuring the thickness of ultrathin workpieces consists of a probe part and a host computer part, wherein the host computer part comprises a DSP control module, an ultrasonic transmitting circuit, an ultrasonic signal-receiving circuit, a signal amplification circuit, a gate circuit, a communication interface, an LCD display and a keyboard. The invention has the advantages of suitability for the thickness measurement of both ultrathin large-curvature workpieces and common workpieces, capability of acquiring ultrasonic echo signals in real time, real-time fast Fourier transform, real-time calculation and storage of pipe wall thickness and capability of realizing mechanized automatic measurement.

Description

technical field [0001] The invention relates to the field of non-destructive testing, and in particular provides a method and an instrument capable of accurately measuring the thickness of ultra-thin workpieces. Background technique [0002] Ultrasonic thickness measurement technology is an important part of the field of non-destructive testing technology, widely used in various fields such as petroleum, chemical industry, metallurgy, shipbuilding, aviation, and aerospace. The existing ultrasonic thickness gauges at home and abroad are based on the principle of ultrasonic pulse reflection to measure thickness. The ultrasonic pulse wave emitted by the ultrasonic probe enters the measured object through the coupling agent, and is reflected when it propagates to the bottom surface in the measured object and is reflected back. The ultrasonic wave (echo) is received by the ultrasonic probe, and the ultrasonic pulse travels back and forth between the two surfaces of the object to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B17/02
Inventor 蔡桂喜韩晓华刘畅徐华董瑞琪贾中青
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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