Abstract
This paper describes the temperature measurement method using thermo-chromic liquid crystal. We investigated experimentally on the relationship between various wavelength spectrum of the scattered light and temperatures. It is found that the white LED light is better than halogen light. The intensity of scattered light is obtained using CMOS monochrome camera. The wavelength of scattered light is separated using band-pass filter. Results show that the measurable temperature range became wider with shorter wavelength, and its range width approached to more than 20℃. In addition, this range is become wider with resolution of temperature decreasing. However, the short wavelength of scattered light, 405 and 420nm, is not enough resolution of temperature at temperature measurement.
