A comparison test block for phased array detection of thin-walled small-diameter tubes
A technology of comparing test blocks and small-diameter tubes, which is applied to measuring devices, instruments, scientific instruments, etc., can solve the problems of reflector interference, inability to meet the moving space of phased array sector scanning, and small quantity, so as to solve angle gain compensation, Solve sound beam testing, depth and variety of effects
Active Publication Date: 2019-04-16
田国良
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Problems solved by technology
[0005] (1) The size of the comparison test block is small, which cannot meet the moving space of phased array sector scanning;
[0006] (2) The distance between the artificial reflectors in the comparison test block is too close, which may easily cause interference between reflectors during sector scan debugging;
[0007] (3) The artificial reflectors of the comparison test block have a single depth and a small number, which cannot fully meet the requirements of sound beam debugging at different angles;
[0008] (4) Angle gain compensation debugging, wedge attenuation compensation and wedge delay compensation cannot be required
[0009] (5) Blind spots cannot be tested
[0010] The existence of these deficiencies seriously hinders the application of phased array ultrasonic testing technology in the detection of thin-walled small-diameter pipe welds.
Method used
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Embodiment 1
[0051] Example 1 is a pipe weld with a detection specification of Φ38mm×5mm, the groove form of the weld is V-shaped, the groove angle is 30°, and the blunt edge height is 0.5mm. A comparative test block with a radius of curvature of 19mm was used to debug the angle gain compensation curve and the process of making the distance-amplitude curve.
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Abstract
The invention provides a thin-walled small-diameter tube phased array detection reference block. The reference block is rectangular, one side is provided with a quarter of arc surface, and transverse through-hole reflectors are distributed on the reference block. A distance-amplitude curve is made and an angle gain compensation curve is debugged to detect a thin-walled small-diameter tube. The reference block provided by the invention is composed of the quarter of arc and the curved surface cuboid containing the transverse through-hole reflectors. The reference block has large specification, can meet the requirements of making of the distance-amplitude curve by sector scanning; the spacing between the reflectors is large, thus avoiding interference among the reflectors during making of the distance-amplitude curve; the reflector depth is various, and can meet the requirements of acoustic beam debugging at different angles. The reference block can satisfy the angle gain compensation, wedge block delay compensation and other requirements of phased array detection, can test a dead zone, and can solve the acoustic beam testing problem of thin-walled small-diameter tubes, and is suitable for use as a thin-walled small-diameter tube detection reference block.
Description
technical field [0001] The invention relates to a comparison test block used in non-destructive testing technology, in particular to a phased array detection comparison test block for thin-walled and small-diameter tubes. Background technique [0002] Phased array ultrasonic testing technology is a new direction of the development of non-destructive testing technology at home and abroad, and it is one of the most advanced testing technologies. Phased array ultrasonic technology is a method of using electronically control the sound beam of a phased array ultrasonic probe to realize ultrasonic transmission and reception. The phased array ultrasonic probe has multiple small chips, namely array elements. Each array element is independently excited and applies different time delays. The ultrasonic waves emitted by all the array elements form an overall wavefront, which can achieve dynamic focusing and It can effectively control the shape and direction of the emitted ultrasonic b...
Claims
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IPC IPC(8): G01N29/30
CPCG01N29/30
Inventor 田国良
Owner 田国良