| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a small infrared ray gas analyzer which detects an analyzes component gas to be analyzed of low concentration while coping with explosion-proof environment. SOLUTION: A cylindrical rotary chopper 20 wherein a part of the cylinder enclosing a light-emitting body 31 of an infrared ray light source 30 comprising a ceramic light emitting body used at high temperature is provided. The intermittent infrared ray light flux projected here is reflected and condensed with a concave condensing mirror 33 bonded to a case 34 of a condensing optical system, and then it is focused as an incident image at an incident window 71 of a white cell 70. The incident infrared ray light flux to the white cell 70 is multiple-reflected in the white cell 70 and then after passing a required light path, ejected to a detector 60. The detector 60 detects the absorption amount of infrared ray in the white cell 70, and measures the concentration of component gas to-be-analyzed in the gas to be measured. The condensing optical system, the white cell 70, and the detector 60 are positioned accurately at a coupling part and tightly combined with no free-flowing air layer is between, thus smaller size, constant temperature, and high sensitivity are realized.</p> |
