| 摘要 |
A thermometer (100) comprises an emitting unit (1), a light receiving unit (3), a lens unit (5), and a calculation unit (773). The emitting unit (1) is configured to emit a measurement light (L m ) into a flue (50), wherethrough a gas (S) that contains light dispersing particles (P) flows. The light receiving unit (3) is configured to receive, of the measurement light (L m ), dispersed measurement light (L d ) dispersed by the light dispersing particles (P). The lens unit (5) is configured to set its focal point (F) at a prescribed position inside the flue (50) and along the light receiving axis (A r ). The calculation unit (773) is configured to calculate the temperature inside the flue (50) based on an intensity ratio of absorption spectra at a plurality of wavelengths. |
