| 摘要 |
<p>An apparatus measures the concentrations of gases within a high temperature gas composition. The apparatus includes an athermal optical multipass cell (e.g., a Herriot cell), an optical device and a detector. The cell, which receives a high temperature gas composition, includes a mounting structure that supports a pair of concave mirrors oppositely disposed along a common axis and separated by a selected distance. One mirror includes an orifice through which an input beam of light from a light source enters the cell. The beam is repeatedly reflected between the mirrors before exiting the cell through the orifice as an output beam. The mounting structure supports the mirrors at the selected distance. The optical device is positioned to receive the output beam exiting the cell. The detector is optically coupled to the imaging device for receiving the output beam in order to measure concentrations of gases within the high temperature gas composition. The light source, the optical device and the detector can be thermally isolated from the high temperature gas composition disposed in the cell.</p> |
