| 摘要 |
<p>PURPOSE:To provide an optical gas sensor which can detect many kinds of gases with high sensitivity. CONSTITUTION:The optical gas sensor is provided with a plurality of light sources 1a to 1c which oscillate laser beams whose wavelength and intensity coincide with, absorption spectra of a plurality of detection gases according to a driving current and a temperature, ' a gas cell part 6 which is arranged so as,to obtain largest optical coupling at light wavelengths coinciding with the respective absorption spectra of the plurality of detection gases and in which a plurality of optical systems constituted of optical paths which are different from those in conventional cases have been built in and an optical transmission line 7 by which the light sources 1a to 1c are connected to the gas cell part 6 and by which the gas cell part 6 is connected to a photodetector 9. In addition, the optical gas sensor is provided with a plurality of light-uniting means 15 and one light-branching means 16 by which beams of light from different light sources are united to one optical transmission line and by which a beam of light from one optical transmission line is branched into a plurality of optical transmission lines and with the photodetector 9 and a detection device 11 at the end of the optical transmission line which connects the gas cell part 6 to the photodetector 9.</p> |
