A Ray Travel Time Correction Method in Ultrasonic CT Detection
A technology of ray travel time and correction method, which is applied in the processing of the detected response signal, the analysis of solids using sonic/ultrasonic/infrasonic waves, and the material analysis using sonic/ultrasonic/infrasonic waves, etc. question
Active Publication Date: 2019-04-02
HANGZHOU HUAXIN TESTING ENG CO LTD
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Problems solved by technology
Since the existing technology cannot accurately eliminate the travel time of the ultrasonic signal in the outer coating, it can only subtract the travel time with an estimated value based on the thickness of the outer coating and the predicted wave velocity to obtain the travel time of the ultrasonic signal in the concrete structure. Obviously deviates from the requirement of high accuracy of travel time measurement
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[0044] The technical solutions of the present invention will be further specifically described below through examples.
[0045] see figure 2 The schematic diagram of the point positions of the transmitting point and the receiving point in the ray travel time correction method of the present invention is shown. exist figure 2 On a detection section shown, it can be seen that the structural components include the concrete structure A and the outer covering layer B. The outer covering layer B and the concrete structure A are heterogeneous to each other, thus forming an interface between them, which is denoted as A-B. S 1 -Sn is the emission point of ultrasonic signal (as the emission point of emission transducer); R 1 -Rn is the receiving point used to realize the travel time measurement of the ultrasonic signal, R 1 -Rn is disposed on the surface opposite to the surface where the emitting point is located. And, in order to correct the coat B against R 1 -Rn influences t...
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The invention provides a correcting method for radial travel time in ultrasonic CT detection. The correcting method is oriented to ultrasonic detection of concrete with a heterogeneity ecderon layer, wherein the reflection echo of an ultrasonic signal on an interface between the ecderon layer and the concrete is collected, the first wave travel time of the reflection echo is utilized to correct the radial travel time and the part transmitted on the ecderon layer in the radial travel time is eliminated, so that the influence of the ecderon layer on the radial travel time after being corrected can be eliminated and the signal transmission time of the ultrasonic signal in the concrete can be accurately reflected. The correcting method provided by the invention has the characteristics that the ultrasonic signal with time-varying characteristics is utilized to overcome the influences of signal attenuation, various echoes and bottom waves in the process of detecting the reflection echo of the signal emitted at each moment.
Description
technical field [0001] The invention relates to a concrete non-destructive testing technology realized by ultrasonic CT, in particular to a ray travel time correction method in ultrasonic CT testing. Background technique [0002] In the interior of the concrete structure, it is possible to have an uncompacted area due to the existence of cavities, cracks or inclusions of sand and debris, as well as a honeycomb area formed due to vibration leakage, segregation or overhead, or a loose area due to lack of cement. and puffy areas caused by accidental damage. These defects destroy the continuity and integrity of the concrete structure, and greatly reduce the bearing strength and durability of concrete. Effectively ascertaining the location, scope and size of the above-mentioned defects in concrete structures is a prerequisite for repairing technical treatment of these defects. [0003] Ultrasonic CT detection of concrete is an accurate and efficient quantitative detection metho...
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IPC IPC(8): G01N29/06G01N29/44
CPCG01N29/0672G01N29/4463G01N2291/0232G01N2291/0289
Inventor 郑刚兵高允王力子朱兆刚
Owner HANGZHOU HUAXIN TESTING ENG CO LTD