| 摘要 |
PURPOSE:To make it possible to accurately measure temp. by receiving only infrared rays emitted from an object to be detected, by providing a second filter position between a first filter and an infrared detection element to permit the transmission of desired infrared rays. CONSTITUTION:A first filter 2 is engaged with the leading end opening part of the detection head part 1 of a radiation thermometer and a lens 3 comprising barium fluoride is provided inside the first filter 2 and a case 4 is provided to the terminal part of the detection head part 1 inside the lens 3. A second filter 5 comprising calcium fluoride is engaged with the case 4 and a thermal infrared detection element 6 is provided inside said filter 5. Only infrared rays with a desired wavelength range are selectively transmitted by the second filter 5. Because the thermal infrared detection element 6 generates a detection signal, temp. can be measured in an extremely accurate manner. |
