Advanced Temperature Distribution Measurement using Thermosensitive Liquid Crystal

Certain liquid crystal polymers exhibit wavelength selectivity when scattering and reflecting irradiated visible light due to changes in their internal structure caused by temperature, and their color changes with temperature. This type of liquid crystal is called a thermosensitive liquid crystal, and by wrapping it in a thin film, microcapsules with a diameter of about 20 to 30 microns can be obtained. By applying this to the surface of the object to be measured for temperature, it is possible to display the surface temperature distribution in color. Using this method, it is possible to remotely measure the temperature distribution on the surface of a rotating or moving object.

Direct Measurement of Heat Transfer Coefficient on the Surface of a Thin Plate using an Infrared Camera

Infrared cameras are often used to remotely measure the temperature distribution on an object's surface. However, if we want to know the amount of heat radiated from the object's surface, we need to measure the heat transfer coefficient distribution in addition to the surface temperature distribution. If the measurement target is a thin plate that generates heat internally, it is possible to estimate the amount of heat radiated from the object's surface from temperature measurements taken with an infrared camera, assuming that the heat moving inside the object due to thermal conduction and the heat dissipated from the object's surface due to convection and radiation are balanced overall.