In this article you will learn what ultrasonic thickness measurement is, when and where it is used. Devices for conducting ultrasound. Types of thickness measurement. Principles and algorithms of work.
In this article you will learn what non-destructive ultrasonic testing is and what advantages it has. Types of non-destructive testing. Methods and algorithms of work.
In this article you will learn what mechanized ultrasound control is and when it is applied. Equipment for mechanized ultrasonic inspection. Areas of application and algorithms of work.
Many grades of bronze are a poor material for ultrasonic testing, since bronze has a high level of structural noise and noticeable anisotropy. This note describes technologies for reducing the level of structural noise using the example of using ultrasonic antenna arrays with high frequency.
Conducting ultrasonic inspection (ultrasound) of two samples of thick-walled pipes made of high-pressure polyethylene using Plane Wave Imaging (PWI) technology and combining partial images using coherent factor (CF) technology in order to increase the signal-to-noise ratio.
In welded joints made by contact butt welding by reflow (CSF), the most dangerous and difficult to detect defects are vertical non-melts that do not have access to any of the pipeline surfaces.
To increase the speed of recording echo signals and increase the speed of image recovery of reflectors, it is proposed to use a thinned switching matrix (SMC). To obtain a switching matrix that allows to obtain images minimally different from the image obtained by the full switching matrix (FMC), it is proposed to use a genetic algorithm. Two variants of optimization of the switching matrix are considered: element-wise thinning and column thinning. Numerical and model experiments have shown that a thinned switching matrix determined using a genetic algorithm, filled by 25%, allows the formation of images that differ from the image obtained by FMC, with an error of about 3%. Working with the switching matrix by columns allows you to increase the speed of recording echo signals by 4 times. The speed of image recovery increases by the same number of times.
An effective method of replacing zonal focusing with an antenna array is proposed, which is traditionally used in automated ultrasonic inspection of welded joints with narrow cutting to detect defects at the fusion boundary. This method, based on the use of multi-circuit digital focusing antenna technology (CFA), allows you to obtain and analyze high-quality images of reflectors. The proposed method, compared with zonal focusing made using phased array technology (HEADLIGHTS), is less sensitive to the accuracy of positioning the antenna array relative to the seam axis and to changes in the thickness of the control object, makes it possible to estimate the height of defects not by amplitude, but by the size of the glare reflectors.
Currently, in order to increase the speed of preparation of the ultrasound control protocol and reduce the influence of the human factor, reflector recognition (classification) systems based on artificial neural networks are being actively developed. For their more efficient operation, the images of the reflectors must be processed in order to increase the signal-to-noise ratio of the image and its segmentation (clustering). One of the segmentation methods consists in image processing with an adaptive anisotropic diffuse filter, which is used for processing optical images. In model experiments, the effectiveness of using this texture filter for segmentation of images of reflectors reconstructed from echo signals measured using antenna arrays has been demonstrated.