Novel utilisation of a circular multi-reflection cell applied to materials ageing experiments
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We report on the novel utilisation of a circular multi-reflection (CMR) cell applied to materials ageing experiments. This enabled trace gas detection within a narrow interfacial region located between two sample materials and remotely interrogated with near-infrared sources combined with fibre-optic coupling. Tunable diode laser absorption spectroscopy was used to detect water vapour and carbon dioxide at wavelengths near 1,358 and 2,004 nm, respectively, with corresponding detection limits of 7 and 1,139 ppm m Hz−0.5. The minimum detectable absorption was estimated to be 2.82 × 10−3 over a 1-s average. In addition, broadband absorption spectroscopy was carried out for the detection of acetic acid, using a super-luminescent light emitting diode centred around 1,430 nm. The 69 cm measurement pathlength was limited by poor manufacturing tolerances of the spherical CMR mirrors and the consequent difficulty of collecting all the cell output light.
KeywordsAtmospheric Water Vapour Platinum Resistance Thermometer Optical Spectrum Analyser Tunable Diode Laser Absorption Spectroscopy Noise Equivalent Concentration
Dr Albert Manninen (Empa, Switzerland) for his discussions regard CMR optics design, and Dr Paul Wynn (AWE plc) for his assistance and input into the CMR mirror holder design.
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