Photothermocapillary Method for the Nondestructive Testing of Solid Materials and Thin Coatings; Sensors; Vol. 21, iss. 19

Bibliographic Details
Parent link:	Sensors Vol. 21, iss. 19.— 2021.— [6671, 14 p.]
Main Author:	Zykov A. Yu. Aleksandr Yurjevich
Corporate Authors:	Национальный исследовательский Томский политехнический университет Инженерная школа неразрушающего контроля и безопасности Центр промышленной томографии Научно-производственная лаборатория "Тепловой контроль", Национальный исследовательский Томский политехнический университет Школа базовой инженерной подготовки Отделение иностранных языков
Other Authors:	Vavilov V. P. Vladimir Platonovich, Kuimova M. V. Marina Valerievna
Summary:	Title screen The photothermocapillary (PTC) effect is a deformation of the free surface of a thin liquid layer on a solid material that is caused by the dependence of the coefficient of surface tension on temperature. The PTC effect is highly sensitive to variations in the thermal conductivity of solids, and this is the basis for PTC techniques in the non-destructive testing of solid non-porous materials. These techniques analyze thermal conductivity and detect subsurface defects, evaluate the thickness of thin varnish-and-paint coatings (VPC), and detect air-filled voids between coatings and metal substrates. In this study, the PTC effect was excited by a “pumped” Helium-Neon laser, which provided the monochromatic light source that is required to produce optical interference patterns. The light of a small-diameter laser beam was reflected from a liquid surface, which was contoured by liquid capillary action and variations in the surface tension. A typical contour produces an interference pattern of concentric rings with a bright and wide outer ring. The minimal or maximal diameter of this pattern was designated as the PTC response. The PTC technique was evaluated to monitor the thickness of VPCs on thermally conductive solid materials. The same PTC technique has been used to measure the thickness of air-filled delaminations between a metal substrate and a coating.
Language:	English
Published:	2021
Subjects:	электронный ресурс труды учёных ТПУ photothermocapillary effect nondestructive testing defect varnish-paint coating delamination surface tension фототермокапиллярный эффект неразрушающий контроль дефекты лакокрасочные покрытия расслоение поверхностное натяжение
Online Access:	http://earchive.tpu.ru/handle/11683/71098 https://doi.org/10.3390/s21196671
Format:	Electronic Book Chapter
KOHA link:	https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=666090