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Issue 15, 2014
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A formaldehyde trace gas sensor based on a thermoelectrically cooled CW-DFB quantum cascade laser

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Abstract

We report the development of a trace gas sensor for the detection of atmospheric formaldehyde utilizing a thermoelectrically cooled distributed-feedback quantum cascade laser operating in continuous-wave mode at 5.68 μm. Wavelength modulation spectroscopy was combined with second harmonic detection and zero air based background subtraction techniques to enhance both detection sensitivity and precision to ∼2.5 ppbv for H2CO measurement with an integration time of less than 1 second and a 36 m optical path length. A novel analysis technique based on wavelet transform for noise reduction was successfully applied to improve the sensor performance, yielding sub-ppb measurement precision without reducing the fast temporal response.

Graphical abstract: A formaldehyde trace gas sensor based on a thermoelectrically cooled CW-DFB quantum cascade laser

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Publication details

The article was received on 06 Nov 2013, accepted on 02 Apr 2014 and first published on 03 Apr 2014


Article type: Paper
DOI: 10.1039/C3AY41964A
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Anal. Methods, 2014,6, 5483-5488
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    A formaldehyde trace gas sensor based on a thermoelectrically cooled CW-DFB quantum cascade laser

    J. Li, U. Parchatka and H. Fischer, Anal. Methods, 2014, 6, 5483
    DOI: 10.1039/C3AY41964A

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