| 摘要 |
<p>PROBLEM TO BE SOLVED: To easily manufacture a measurement cell having an optical path length suitable to the concentration range of a measuring gas at low cost. SOLUTION: Denoted at IA is a first cylinder, 1B is a second cylinder, and they have natural convection holes 9 on the respective circumferential walls. A light source part 11 is arranged on the left side of the cylinder 1A, and a detection part 12 on the right side of the cylinder 1B shown by a dashed line herein. The left circumferential part of the cylinder 1B is fitted to the right circumferential part of the cylinder 1A so as to be relatively movable in the axial direction. Thus, a measurement cell. formed by mutually fitting the cylinders 1A, 1B can be continuously changed to an optical path length suitable to the concentration range of a measuring gas. When the relative positioning of each cylinder 1A, 1B is ended, the light source part 11 and the detection part 12 are installed, respectively, and fixed to a base not shown by each fixing leg 14.</p> |
