Influencing Factors Analysis on Infrared Detection of Pressure Vessels Defect with External Thermal Excitation
The hidden defects of pressure vessel could be inspected using the non-destructive detection technique of infrared thermography, however, the detection precision would be significantly affected by environmental conditions. Using thermal excitation to artificially create reasonable temperature distribution plays an important role in improving the detection precision. The heat transfer model of defects in insulating pressure vessel under externel thermal excitation was established with infrared detection, and influencing factors on infrared detection of pressure vessel defect were analyzed. The infrared detection effect of environmental factors, thermal excitation intensity and thermal excitation time were simulated. The results show that: 1) increasing thermal excitation intensity, the comparison temperature of detection surface decreases with the infrared radiation temperature of thermal excitation intensity below 300℃, but with the thermal excitation intensity above 300℃, the comparison temperature of detection surface increases with increasing thermal excitation intensity; 2) with increasing excitation time, the comparison temperature emergences a maximal inflexion, and finally decreases to the comparison temperature at steady state; 3) infrared detection precision was significantly affected by the wind velocity and surface absorption coefficient of pressure vessel in environmental conditions, but the effect of environmental temperature can be ignored when infrared detection of pressure vessels defect is carried out in atmospheric environment.
pressure vessel defect infrared thermography thermal excitation influence factors
LI Dong XING Chang SONG Fenfen WU Guozhong
College of Architecture and Civil Engineering, Daqing Petroleum Institute, Daqing 163318, Heilongjiang, China
国际会议
The 2010 International Symposium on Safety Science and Technology(2010 安全科学与技术国际会议)
杭州
英文
1290-1295
2010-10-26（万方平台首次上网日期，不代表论文的发表时间）