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Because NDT does not permanently alter the article being inspected, it is a highly valuable technique that can save both money and time in product evaluation, troubleshooting, and research. The six most frequently used NDT methods are eddy-current , magnetic-particle , liquid penetrant , radiographic , ultrasonic , and visual testing . [ 3 ]
XRay, Optical, and THz image of a packaged IC. [2]Terahertz imaging is an emerging and significant nondestructive evaluation (NDE) technique used for dielectric (nonconducting, i.e., an insulator) materials analysis and quality control in the pharmaceutical, biomedical, security, materials characterization, and aerospace industries.
The technique is very sensitive and can detect tight cracks. Surface inspection can be performed both on ferromagnetic and non-ferromagnetic materials. [8] [9] Tubing inspection is generally limited to non-ferromagnetic tubing and is known as conventional eddy current testing.
A lot of methods were developed for active thermography for the nondestructive testing measurement evaluation. The evaluation methods selection depends on application, used excitation source and excitation type (pulse, periodic, continuous). In the simplest case, the response is evident from a thermogram directly.
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Microwave testing is one of the methods of non-destructive testing (NDT). It is restricted to tests of dielectric, i. e. non-conducting material. This includes glass-fibre reinforced plastic (GRP, GFRP). [5] Microwave testing can be used to inspect components also in a built-in state, e. g. built-in non-visible gaskets in plastic valves.
The "Laser Ultrasonic" technique is part of those measurement techniques known as "non-destructive techniques or NDT", that is, methods which do not change the state of measurand itself. Laser ultrasonics is a contactless ultrasonic inspection technique based on excitation and ultrasound measurement using two lasers.
The Conference Department of ASNT regularly organizes two (ASNT Research Symposium, and ASNT Annual Conference) major scientific and technical conferences around March and October each year. ASNT publishes the journals Materials Evaluation (ME), Research in Nondestructive Evaluation (RNDE) , and The NDT Technician (TNT) and multiple books on NDT.