I4.1 - Compact Multi Reflection Cells for Optical Gas Sensor Applications
- SENSOR+TEST Conferences 2009
2009-05-26 - 2009-05-28
Congress Center Nürnberg
- Proceedings OPTO 2009 & IRS² 2009
- IRS² 4 - Gas Analysis
- J. Herbst, B. Scherer, M. Steffen, B. Halford, A. Lambrecht - Fraunhofer IPM, Freiburg, Germany
- 255 - 256
Measuring low gas concentrations with absorption spectroscopy requires long optical paths in order to obtain sufficient detection limits. For low quantities of gas or a high temporal resolution the volume of the measurement cell should be as small as possible. This is the only way to guarantee an efficient, rapid gas exchange. A gas cell setup with a mirror configuration for multiple reflection allows keeping the dimensions of the cell low and, at the same time, ensures a long optical path.
Fraunhofer IPM develops compact and robust multi reflection gas measurement cells with optical path lengths between 1.6 -15 m for scientific and industrial applications. There are two cell types with different mirror configurations. First the Herriott cell consist of two opposed spherical mirrors, the White cell of three.