| 摘要 |
PURPOSE: To require no complex control by heating a blackbody panel up to a specified temperature so as to make a specified band of wavelength components of a radiated infrared ray transmit. CONSTITUTION: An infrared ray transmitting glass 2 is fitted on the front face of a box case 1 made of stainless, an infrared ray transmitting glass 3, a blackbody panel 4 for infrared ray radiation, and an electrical heater 5 are fitted thereafter, and the periphery of the panel 4 and the heater 5 and surrounded by adiabatic material 6 so as to constitute an infrared ray radiation panel assembly. The infrared ray transmitting glasses 2, 3 constitute the 3.3mm band infrared ray radiation panel assembly. When the heater 5 is energized so as to heat the panel 4 up to 440 through 450K (about 170 deg.C), only about 3.0 through 3.8μm components out of radiated ray from the panel 4 transmit the glass 3. Next, only about 3.0 through 3.6μm wavelength components transmit the glass 2, and other wavelength components are sharply cut off. The 3.3μm band infrared ray has quite a large absorption coefficient against a CH radical, and can be used for detecting hydrocarbon gas containing the CH group. |
