A novel trace gas detection scheme based upon the photothermal effect following light absorption is described. The resulting index change, which is proportional to the trace species absorption and concentration, is measured interferometrically in a stabilized Fabry–Perot cavity. An experimental noise limit corresponding to an absorption coefficient of 4×10−8 cm−1/( √Hz) was observed. We discuss possible improvements and estimate the ultimate sensitivities achievable with this technique.
No takes yet. Share an insight, caveat, or question.
Campillo et al. (1982) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: