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Open Path CEM Systems
Opsis Open Path Continuous Emission Monitoring System
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Opsis systems utilise optical measurements because the technique is flexible and provides rapid measurements that allow the quantification of several gases simultaneously with great reliability. Opsis products uses the DOAS (Differential Optical Absorption Spectroscopy) technique.
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DOAS Technique
In a DOAS system, an emitter projects a beam of light to a receiver. In an industrial application the light beam crosses a stack or duct. The light is transferred to the Opsis analyser through a fibre optic cable. Here, specific gases will absorb light from known parts of the spectrum, both in the UV, visible and IR wavelength ranges. The absorption is recorded by using a computer-controlled spectrometer. The computer also registers results for immediate display or future analysis.
The Opsis data, together with other information, is stored in the analyser and is available for rapid processing, analysis and presentation through the user-friendly Opsis software packages.