Abstract
Infrared active thermography for detecting residual water in steel pipes is evaluated. In the active thermography method, the pipes are heated by a heater, and the surface temperature after heating is observed using an infrared camera. The experimental results show that the observed surface temperature of the pipes is dependent on the height of the residual water; the water height can therefore be estimated from the surface temperature. A data processing procedure for the observed temperature–time data to estimate the water height is proposed, and its effectiveness is evaluated experimentally. In the proposed method, the water height is estimated by comparing the processed temperature with the reference data obtained from numerical calculations. The experimental results show that the estimation results agree well with the actual water heights.
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