カラー画像処理を援用した感温液晶シートによる非定常温度計測

抄録

Thermo-sensitive liquid-crystal sheets are a useful means to measure thermal fields under steady and/or unsteady operating conditions of heat exchangers. With application of a color image processing technique to an image of the thermal field visualized, quantitative data of the temperature can be obtained. When such liquid-crystal sheet is adopted to measure unsteady temperature, it is necessary to take into account the frequency response, i.e., the phase shift and gain. This paper describes an experimental investigation and simplified formulation of the temperature response of the sheet, and a Bode diagram of the temperature response is presented. It is confirmed that the liquid-crystal sheet is applicable to the measurement of the temperature fluctuation up to 0.2Hz.