Patent ID: 8123403

Claim:
A temperature sensor probe for measuring temperature using a fluorescent substance that changes fluorescence characteristics based on temperature, comprising: a fluorescent material that mixes a fluorescent substance with a transparent material, a thermosensitive part comprising a concave part in which said fluorescent material is arranged, a waveguide route member that propagates excitation light, which is irradiated on said fluorescent material, and fluorescent light, which is generated by said fluorescent material, and a protective tube that covers the side surface of said waveguide route member having an open end and a closed end, wherein said fluorescent material is affixed to the tip of said waveguide route member by said transparent material, and said waveguide route member bites into said fluorescent member, and wherein a gap is formed between the waveguide route member and the protective tube and the gap extends from the open end to the closed end of the protective tube.