Detection of propane using tunable diode laser spectroscopy at 3.37 μm
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We report Tunable Diode Laser Spectroscopy measurements of propane using a recently developed 3.37 μm GaInAsSb/AlGaInAsSb DFB laser. We have demonstrated that Wavelength Modulation Spectroscopy can be utilized to enhance a sharp feature in the broader propane spectrum around 3370.4 nm. A minimum detectable concentration of 30 ppb×m was obtained at a response time of 0.5 s. This corresponded to a minimum detectable absorption of 8 × 10−5 which is why an improvement of the sensitivity by an order of magnitude is possible using this laser and a more optimized optical setup.
KeywordsGaSb Minimum Detectable Concentration Wavelength Modulation Spectroscopy Tunable Diode Laser Spectroscopy Wavelength Modulation Spectroscopy Signal
This work has been funded by the European Commission in the frame of the FP7 project SensHy (grant No. 223998).
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