Method for achieving correction of distance-amplitude curve

A technology of curve correction and implementation method, which is applied in the field of ultrasonic flaw detection, can solve the problems of slow distance-amplitude curve correction, high cost, and complexity of hardware development of ultrasonic flaw detection equipment, so as to improve the correction speed and hardware reliability, and reduce the development cost. Cost, the effect of simplifying development complexity

Inactive Publication Date: 2014-07-09
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

[0005] The present invention aims at the problem of slow correction speed and high cost of distance-amplitude curve correction in ultrasonic flaw detection, and proposes a method for realizing distance-amplitude curve correction, which uses FPGA to realize defect signal ultrasonic echo amplitude correction based on DAC curve , which solves the problem that the microprocessor must be used for floating-point calculations in the calibration process, and simplifies the hardware development complexity of ultrasonic flaw detection equipment

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  • Method for achieving correction of distance-amplitude curve
  • Method for achieving correction of distance-amplitude curve
  • Method for achieving correction of distance-amplitude curve

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[0029] The technical solution adopted in the present invention is: fitting the corresponding distance-amplitude curve (DAC curve) according to each DAC point, and discretizing the DAC curve into DAC curve correction segments at fixed intervals, and downloading the parameters to FPGA (Field-Programmable Gate Array Field Programmable Gate Array), FPGA performs DAC curve correction on the sampling signal in the corresponding curve segment according to the parameters, such as figure 2 The schematic diagram of DAC curve discretization is shown, in which: DAC curve fitting is completed by PC, and the discrete DAC curve is sent to FPGA in the form of parameters; FPGA performs DAC curve correction on the sampled data according to the DAC curve parameters.

[0030] The DAC curve supports up to 16 DAC points, the gain correction range is -20dB~30dB, each DAC point P n (x n ,y n ) have two coordinate values, x n The abscissa DAC_x is time (us), y n The ordinate is DAC_y gain (dB). ...

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Abstract

The invention relates to a method for achieving correction of a distance-amplitude curve. The method comprises the steps of fitting the corresponding distance-amplitude curve (DAC) according to each DAC point, dispersing the DAC curve into DAC curve correction sections at fixed intervals, downloading the DAC curve correction sections to a field programmable gate array (FPGA) through parameters, and performing DAC correction on sampled signals in the corresponding curve sections through the FPGA according to the parameters. By means of the method, the problem that floating-point calculation must be performed by a microprocessor in the correction process is solved, development complexity of hardware of ultrasonic flaw detectors is simplified, development cost is reduced, correction speed is increased, and reliability of the hardware is improved.

Description

technical field [0001] The invention relates to an ultrasonic flaw detection technology, in particular to a method for realizing distance-amplitude curve correction. Background technique [0002] In ultrasonic flaw detection, for defects with the same nature and size, the height of the echo reflected by the defect is also different due to the difference in depth (sound path). In order to solve this problem, it is necessary to make the distance-amplitude curve (DAC curve) of artificial reflectors with the same size and different depths to describe the relationship between the echo height of the reflector and the distance, which is used to quantify and analyze the ultrasonic echo amplitude of the defect signal. Sensitivity correction. [0003] Such as figure 1 The DAC calibration diagram shown in the figure, the DAC curve is generally made by setting points and connecting lines. The position of the first point is adjusted to about 80% by using the automatic gain function, an...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/44
Inventor 杨帆
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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