Method for improving ultrasonic thickness measurement accuracy by using curve fitting

A technology of curve fitting and thickness measurement, applied in the direction of using ultrasonic/sonic/infrasonic waves, measuring devices, instruments, etc., can solve the problems of high precision and unsatisfactory thickness measurement precision, so as to improve the reliability of implementation and reduce the complexity of implementation Effect

Inactive Publication Date: 2014-01-01
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

[0005] The present invention aims at the problem that improving the accuracy of thickness measurement by only increasing the sampling clock frequency cannot meet the requirements of improving the accuracy, and proposes a...

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  • Method for improving ultrasonic thickness measurement accuracy by using curve fitting
  • Method for improving ultrasonic thickness measurement accuracy by using curve fitting
  • Method for improving ultrasonic thickness measurement accuracy by using curve fitting

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Embodiment Construction

[0032] Use the curve fitting algorithm to calculate the time difference corresponding to the feature points in the two echoes, and multiply the time difference by the sound velocity to obtain the thickness, as shown in figure 2 The schematic diagram of the functional modules in the curve fitting ultrasonic thickness measurement method is shown, including a sampling point acquisition module, a curve fitting module and a thickness calculation module.

[0033]Since the ultrasonic signal is similar to a straight line within a small period of time (one sampling period) above and below the zero point, and the higher the signal amplitude is, the closer it is to a straight line, so the feature points are selected as the positive maximum peak value or negative maximum peak value of the echo signal. The zero point of the curve fitting algorithm adopts straight line fitting, and the straight line fitting requires two sampling points, which are selected as two sampling points adjacent to ...

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Abstract

The invention relates to a method for improving the ultrasonic thickness measurement accuracy by using curve fitting. The method comprises the following steps: according to the characteristics that an ultrasonic signal is similar to a straight line in a short time period above and below a zero point, and when the signal amplitude is higher, the signal is more similar to the straight line, collecting two adjacent sampling points above and below the zero point at the two sides of the positive maximum peak or the negative maximum peak of an echo signal, fitting a straight line through the sampling points, working out corresponding coordinates of a feature point on the fitted curve, sending the coordinates to a thickness calculating module and calculating the thickness of an object to be measured. The method has the advantages that a curve fitting algorithm is used for compensating sampling precision, so that the ultrasonic thickness measurement accuracy is effectively improved under the condition that the sampling clock frequency is constant so as to meet the requirements on the thickness measurement accuracy in certain occasions, the complexity of hardware implementation is reduced, and the reliability of the implementation is improved.

Description

technical field [0001] The invention relates to a method for improving the precision of ultrasonic thickness measurement, in particular to a method for improving the precision of ultrasonic thickness measurement by curve fitting. Background technique [0002] Ultrasonic thickness measurement is based on the principle of ultrasonic pulse reflection to measure thickness. When the ultrasonic pulse emitted by the probe passes through the measured object and reaches the material interface, the pulse is reflected back to the probe. Ultrasonic thickness measurement calculates the transmission time of ultrasonic waves in the measured object through the echo signals of the upper and lower surfaces of the measured object, and multiplies this time with the speed of ultrasonic transmission in the measured object to obtain the thickness of the object. The usual method is to select a feature point (zero point or extreme value point) and calculate the time difference between the two echoes...

Claims

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Application Information

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IPC IPC(8): G01B17/02
Inventor 杨帆
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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