The article proposes a segmentation method based on the construction of a binary mask that hides the glare of reflectors.
The use of TOFD technology in the development of the ECHOPLUS. Overview of the capabilities of the equipment and software developed by the ECHOPLUS in order to implement the TOFD technology.
In this article you will learn what a nuclear power plant is and how it is used. Advantages and features of nuclear power plants. Areas of application.
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.
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.
There is a concept of technology maturity levels (technology readiness level — TRL), which describes the technology transition from the TRL 1 level. “The fundamental concept of technology has been formulated” to the TRL 9 level. “The product meets all requirements: engineering, production, operational, quality and reliability.” So the Total Focusing Method technology, aka digital antenna focusing (CFA), aka combinational SAFT, aka IWEX, aka Sampled Phased Arrays (SPA) has turned from an exotic and contested algorithm into a standardized one.
In the first part of the article, it is shown that in order to restore a high-quality image of reflectors in a welded joint of a pipeline of the Du800 type, it is not enough to use the CFA method in a variant designed for the propagation of ultrasound in a homogeneous isotropic medium. To further improve the image quality in the CFA method, it is necessary to: determine the elastic properties of the surfacing of the Dn800 pipeline and take into account its anisotropy during ultrasound propagation, as well as the surface profile. To increase the resolution and reduce the noise level, the CFR-H and maximum entropy (ME) methods were applied. Comparison of the results of ultrasound and X-ray controls allowed us to conclude that the first of them is more informative for detecting crack-like reflectors.
The application of the digital image focusing (DFA) method to determine the type of detected reflectors is considered. To do this, two antenna arrays are used, located on opposite sides of the reflector, with the help of which echo signals are recorded through three acoustic channels in the double scanning mode.
The Plane Wave Imaging (PHI) method allows you to combine the advantages of phased array antenna technology (FAR) and CFA technology. In PWI mode, when emitting a plane wave, all elements of the antenna array (AR) work (as in the HEADLIGHT mode), which allows you to increase the energy entered into the control object, and echo signals are recorded by all elements of the AR (as in the CFA mode).