| 摘要 |
PURPOSE:To improve the analyzing accuracy by arranging a compact, inverted three-face mirror in a right triangular pyramid shape at the vertex of the retroreflector of an infrared gas analyzer, and increasing the intensity of the sensed light. CONSTITUTION:On the optical axis passing the vertex of the retroreflector 95, the compact, inverted three-face mirror 90, comprising three reflecting surfaces 104- 106 which cross at a right angle one another, is arranged so that said surface 104- 106 are aligned at a right angle with or in parallel with the three surfaces 101-103 of the reflector 95. The beam is outputted from the window W of a beam splitter BS with some width provided, reflected by the reflector 95 or by the inverted three- face mirror 96, and inputted to reflecting surfaces BSa and BSb of the beam splitter. Therefore, no light is inputted to the window W. Thus, the intensity of the light reflected by the beam splitter BS and inputted to a light receiving device is increased, and the measuring accuracy is heightened. |
