| 摘要 |
PURPOSE:To construct an analyzer in a small size and have a high certainty and high sensitivity analysis by furnishing a super-small light source which emits infrared rays into each cell, and providing a light chopper which shuts off intermittently the infrared rays after passing the cells. CONSTITUTION:A beam of light emitted from a super-small lamp 41 passes through infrared penetration films 42, 43, and only infrared rays are incident on a standard cell 30 and a measuring cell 31. The infrared rays projected on these cells 30, 31 are reflected by mirrors 44, 45, passed through the standard gas and the gas to be measured, respectively, led to filters 46, 47 by the mirrors 44, 45, and shut off and allowed to proceed by a light chopper 48. The beam of light having passed this chopper 48 is sensed by an infrared sensor 49, and a signal processing circuit 50 calculates the concentration of the gas measured on the basis of the difference in the penetration photo amount between the standard cell 30 and measuring cell 31. Thus analyzer is constructed small, and high sensitivity and high certainty analyses are made practicable. |
