Calibration details

For calibration, the surface plate mounted with the LC sheet is heated under no flow conditions to a temperature just above its active range. Here, the color of the LC sheet will appear to be uniformly blue (Figure 6.4(a)).

Figure 6.4(a) Test surface heated to the clearing point temperature of the LCT sheet

The heater is turned off and the surface is allowed to cool slowly by natural convection. Several K-type thermocouples can be embedded inside the aluminum plate from underneath. One of these pre-calibrated thermocouples can be utilized for the calibration purpose.