| 摘要 |
<p>PURPOSE:To make possible measurement with high accuracy and high speed response by constituting a measuring cell of a cylindrical gas filter consisting essentially of a metallic fibrous material or sintered metallic body and allowing a measuring gas to intrude into said cell through a filter surface. CONSTITUTION:A measuring cell part consists essentially of IR transmission window parts 30, 31, the cylindrical gas filter 33 and an outside housing 34 of which the inside surface is cylindrical. The filter 33 consisting of the corrosion resistant metallic fibrous material is fixed to the housing 34 in such a manner that said filter can be attached to and detached from the housing and that the measuring gas enters the housing only through the filter part. On the other hand, the window parts 30, 31 consist of an IR transmittable window material and is fixed to the housing 34 by the gas sealable construction. The ray from the light source part is transmitted through the inside of the filter 33 and is detected by the detecting part. The concn. of the measuring gas is measured from the quantity of the ray absorbed by the measuring gas intruding into the cell. The dust contained in the measuring gas is thus effectively removed and the mist and moisture condensation in the cell are prevented, by which the substitution speed by the diffusion and convection of the gas in the measuring cell is increased and the high-speed response is made possible.</p> |
