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Multipass optical cell based upon two cylindrical mirrors for tunable diode laser absorption spectroscopy |
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| Authors: | V.L. Kasyutich P.A. Martin |
| Affiliation: | (1) TDL Sensors Ltd, School of Chemical Engineering and Analytical Science, University of Manchester, PO Box 88, Manchester, M60 1QD, UK;(2) School of Chemical Engineering and Analytical Science, University of Manchester, PO Box 88, Manchester, M60 1QD, UK |
| Abstract: | A compact multipass optical cell based upon a front cylindrical mirror with a central input/output hole and a rear cylindrical mirror is described for application to tunable diode laser absorption spectroscopy. Rotation of the rear cylindrical mirror and small variations of the cell base length (∼110 mm) have been used to achieve different spot patterns and path lengths. CO2 and CH4 direct absorption measurements using the developed cell with a fibre-coupled distributed-feedback laser at 1605.5 nm have been performed. A noise-equivalent absorption sensitivity of 2.5×10-8 cm-1 Hz-1/2 has been determined for 138 passes in the cell and averaging of 2000 consecutive scans within 1.93 s. PACS 42.55.Px; 39.30.+w; 42.62.Fi; 42.60.-v |
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