Patent ID: 9395251
Filing Date: 2016-07-19
CPC Classification: G01K

Claim Text:
1. An optical temperature sensor, comprising: an outer shell member formed of a light-transmissive substance; an inclusion enclosed within the outer shell member, wherein the inclusion is made of a temperature sensitive fluorescent material and emits a fluorescence depending upon a temperature of the inclusion; an incoming light guide path connected with the outer shell member; and an outgoing light guide path connected with the outer shell member, wherein the outer shell member transmits a light entered from the incoming light guide path such that the light irradiates the inclusion, the outer shell member transmits the light emitted from the inclusion such that the light enters the outgoing light guide path, a thermal expansion coefficient of the outer shell member is less than a thermal expansion coefficient of the inclusion, and a phase transition temperature from solid phase to liquid phase of the outer shell member is higher than a phase transition temperature from solid phase to liquid phase of the inclusion.