摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a gas sensor for measuring the concentration of the gas to be sensed in a gaseous atmosphere on the basis of a change in the intensity of infrared rays transmitted through the gaseous atmosphere being a measuring target by constituting a small-sized precise optical system. <P>SOLUTION: The gas sensor includes a cylindrical gas introducing part 1 having a plurality of holes 5, in which a gas to be measured flows, provided to its side surface, the mirror 2 provided to one end part of the gas introducing part 1 and held so as to be brought into contact with the inner wall of the gas introducing part 1 and a lens unit 3 wherein two optical fibers 4, which are composed of the floodlight projection pipe 4a provided to the other end part of the gas introducing part 1, held to the inner wall of the gas introducing part 1 in a contact state and projecting infrared rays into the cylinder of the gas introducing part 1 and the light receiving pipe 4b for receiving the infrared rays reflected by the mirror 2 to be emitted outside from the gas introducing part 1, is joined to a single lens 30. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |