Sensitive detection of methane at 3.3 µm using an integrating sphere and interband cascade laser

N. M. Davis; J. Hodgkinson; D. Francis; R. P. Tatam

doi:10.1117/12.2227131

29 April 2016 Sensitive detection of methane at 3.3 μm using an integrating sphere and interband cascade laser

N. M. Davis, J. Hodgkinson, D. Francis, R. P. Tatam

Proceedings Volume 9899, Optical Sensing and Detection IV; 98990M (2016) https://doi.org/10.1117/12.2227131
Event: SPIE Photonics Europe, 2016, Brussels, Belgium

Abstract

Detection of methane at 3.3μm using a DFB Interband Cascade Laser and gold coated integrating sphere is performed. A 10cm diameter sphere with effective path length of 54.5cm was adapted for use as a gas cell. A comparison between this system and one using a 25cm path length single-pass gas cell is made using direct TDLS and methane concentrations between 0 and 1000 ppm. Initial investigations suggest a limit of detection of 1.0ppm for the integrating sphere and 2.2ppm for the single pass gas cell. The system has potential applications in challenging or industrial environments subject to high levels of vibration.

Citation Download Citation

N. M. Davis, J. Hodgkinson, D. Francis, and R. P. Tatam "Sensitive detection of methane at 3.3 μm using an integrating sphere and interband cascade laser", Proc. SPIE 9899, Optical Sensing and Detection IV, 98990M (29 April 2016); https://doi.org/10.1117/12.2227131

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