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2 results about "Cavity ring-down spectroscopy" patented technology
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Cavity ring-down spectroscopy (CRDS) is a highly sensitive optical spectroscopic technique that enables measurement of absolute optical extinction by samples that scatter and absorb light. It has been widely used to study gaseous samples which absorb light at specific wavelengths, and in turn to determine mole fractions down to the parts per trillion level. The technique is also known as cavity ring-down laser absorption spectroscopy (CRLAS).
Method for on-line monitoring of multi-component gas concentration by optical cavity ring-down spectroscopy
The application discloses a cavity ring-down spectroscopy multi-component gas concentration online monitoring method, and belongs to the technical field of gas monitoring; based on the light path propagation direction, a target optical cavity is divided into a front end layer, a core layer and a tail end layer, and a plurality of cavity ring-down spectrometers synchronously collect decay signals of each layer at a unified data collection time point to construct a hierarchical cavity ring-down matrix; a standard gas with a preset concentration is introduced at a calibration time point, initial values of gas concentrations of each layer are calculated, and a hierarchical concentration error matrix is constructed; envelope fusion processing is performed on the decay signals of each layer to obtain fused decay signals, and the fused decay signals are uniformly corrected based on a hierarchical error offset result; hierarchical equivalent gas concentrations of each layer are calculated, and a comprehensive concentration of multi-component gas is obtained through hierarchical collaborative weighting as an online monitoring result output, which can effectively suppress the influence of systematic errors on the monitoring result, and improve the stability, consistency and engineering applicability of multi-component gas online monitoring.
Owner:NANJING XINHUAN OPTOELECTRONIC TECH CO LTD