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  • Title: Near-infrared broad-band cavity enhanced absorption spectroscopy using a superluminescent light emitting diode.
    Author: Denzer W, Hamilton ML, Hancock G, Islam M, Langley CE, Peverall R, Ritchie GA.
    Journal: Analyst; 2009 Nov; 134(11):2220-3. PubMed ID: 19838407.
    Abstract:
    A fibre coupled near-infrared superluminescent light emitting diode that emits approximately 10 mW of radiation between 1.62 and 1.7 microm is employed in combination with a broad-band cavity enhanced spectrometer consisting of a linear optical cavity with mirrors of reflectivity approximately 99.98% and either a dispersive near-infrared spectrometer or a Fourier transform interferometer. Results are presented on the absorption of 1,3-butadiene, and sensitivities are achieved of 6.1 x 10(-8) cm(-1) using the dispersive spectrometer in combination with phase-sensitive detection, and 1.5 x 10(-8) cm(-1) using the Fourier transform interferometer (expressed as a minimum detectable absorption coefficient) over several minutes of acquisition time.
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