Effects of Thermal Gradients in High-Temperature Ultrasonic Non-Destructive Tests

被引:11
|
作者
Slongo, Juliano Scholz [1 ]
Gund, Jefferson [1 ]
Rigo Passarin, Thiago Alberto [1 ]
Pipa, Daniel Rodrigues [1 ]
Ramos, Julio Endress [2 ]
Arruda, Lucia Valeria [1 ]
Neves Junior, Flavio [1 ]
机构
[1] Univ Tecnol Fed Parana, Grad Sch Elect Engn & Appl Comp Sci, BR-80230901 Curitiba, Parana, Brazil
[2] Ctr Pesquisas Desenvolvimento & Inovacao Leopoldo, BR-21941915 Rio De Janeiro, Brazil
关键词
ultrasonic NDT; phased array; high temperature; thermal gradients; STEEL; TRANSDUCERS;
D O I
10.3390/s22072799
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
Ultrasonic inspection techniques and non-destructive tests are widely applied in evaluating products and equipment in the oil, petrochemical, steel, naval, and energy industries. These methods are well established and efficient for inspection procedures at room temperature. However, errors can be observed in the positioning and sizing of the flaws when such techniques are used during inspection procedures under high working temperatures. In such situations, the temperature gradients generate acoustic anisotropy and consequently distortion of the ultrasonic beams. Failure to consider such distortions in ultrasonic signals can result, in extreme situations, in mistaken decision making by inspectors and professionals responsible for guaranteeing product quality or the integrity of the evaluated equipment. In this scenario, this work presents a mathematical tool capable of mitigating positioning errors through the correction of focal laws. For the development of the tool, ray tracing concepts are used, as well as a model of heat propagation in solids and an experimentally defined linear approximation of dependence between sound speed and temperature. Using the focal law correction tool, the relative firing delays of the active elements are calculated considering the temperature gradients along the sonic path, and the results demonstrate a reduction of more than 68% in the error of flaw positioning.
引用
收藏
页数:16
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