Tunable mid-infrared laser absorption spectroscopy

Tittel, Frank K.; Lewicki, R.

doi:10.1533/9780857096401.3.579

Cited by 14 publications

(8 citation statements)

References 171 publications

(232 reference statements)

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“…The ratio between two reference spectra is a good comparison and as we are interested in the absorbance we can use directly Eq. (2). From this result the noise level is established by taking the absorbance root mean square (rms) value.…”

Section: Noise Determination and Sensitivity Analysismentioning

confidence: 99%

“…Many systems are based in the near to mid-infrared region of the electromagnetic spectrum. This is mainly because the fundamental rovibrational absorption modes of the molecules produce strong spectroscopic fingerprints in this region [2]. In the near infrared region of the spectrum a host of sources of varying complexity, size and price exist because of the needs of the telecommunication industry for which this is the favored wavelength.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Multicomponent gas analysis using broadband quantum cascade laser spectroscopy

Reyes-Reyes¹,

Hou²,

Mastrigt³

et al. 2014

Opt. Express

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Abstract:We present a broadband quantum cascade laser-based spectroscopic system covering the region between 850 and 1250 cm −1 . Its robust multipass cavity ensures a constant interaction length over the entire spectral region. The device enables the detection and identification of numerous molecules present in a complex gas mixture without any pre-treatment in two minutes. We demonstrate that we can detect sub-ppmv concentration of acetone in presence of 2% of water at the same wavenumber region.

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Section: Noise Determination and Sensitivity Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multicomponent gas analysis using broadband quantum cascade laser spectroscopy

Reyes-Reyes¹,

Hou²,

Mastrigt³

et al. 2014

Opt. Express

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show abstract

“…Nevertheless, the above derivation clearly indicates that the increase in path length due to increased optical power of QC lasers is attenuated by the logarithmic behavior of a transmission measurement. This is in contrast to other techniques, such as photoacoustic spectroscopy where the signal is proportional to source intensity, 6 thus leading to much higher signal enhancement.…”

Section: Analyte Signal In Transmission Spectroscopymentioning

confidence: 75%

Measures for optimizing pulsed EC-QC laser spectroscopy of liquids and application to multi-analyte blood analysis

et al. 2013

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We employed a broadly tunable pulsed external cavity (EC)-QC laser with a spectral tuning range from 1030 cm -1 to 1230 cm -1 and a tuning speed of 166 cm -1 /s for direct absorption spectroscopy of aqueous solutions. The laser offered spectral power densities of up to four orders of magnitude higher than available with a conventional FTIR spectrometer. Therefore, a portable demonstration system with a large optical path length transmission flow cell (165 µm) could be realized preventing clogging of the flow cell. In pulsed mode an EC-QC laser provides significantly higher peak power levels than in continuous-wave mode, but pulse-to-pulse intensity variations, intra-pulse mode hops and mechanical imperfections of the scanning mechanism significantly impair the quality of resulting absorbance spectra. This article reports on measures which we found appropriate to reduce the initially high noise level of EC-QC laser absorbance spectra. These measures include a spectral self-referencing algorithm that makes use of the inherent structure of the EC-QC laser's gain curve to correct laser instabilities, as well as Fourier filtering, among others. This enabled us to derive infrared spectra which were finally useful for quantitative analysis in blood plasma samples. Finally, with the appropriate measures in place and using partial least squares regression analysis it was possible to simultaneously quantify 6 blood analytes from a single physical measurement of a 200 µL blood sample. This proves the potential of EC-QC lasers for practical application in clinical point of care analysis.

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“…This is especially the case when trace compounds have to be detected, which only show up in tiny spectral signatures in the spectra. In addition, thanks to the use of laser source, LAS-based standoff technology has good features of improved spectral selectivity or resolution, high selectivity, good spatial resolution and high spatial coherence [14], which help it meet the aforementioned requirements of remote detections to the greatest extent and make it one of the most promising solutions for highly efficient and sensitive standoff chemical detection.…”

Section: Introductionmentioning

confidence: 99%

Standoff Chemical Detection Using Laser Absorption Spectroscopy: A Review

et al. 2020

Remote Sensing

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Remote chemical detection in the atmosphere or some specific space has always been of great interest in many applications for environmental protection and safety. Laser absorption spectroscopy (LAS) is a highly desirable technology, benefiting from high measurement sensitivity, improved spectral selectivity or resolution, fast response and capability of good spatial resolution, multi-species and standoff detection with a non-cooperative target. Numerous LAS-based standoff detection techniques have seen rapid development recently and are reviewed herein, including differential absorption LiDAR, tunable laser absorption spectroscopy, laser photoacoustic spectroscopy, dual comb spectroscopy, laser heterodyne radiometry and active coherent laser absorption spectroscopy. An update of the current status of these various methods is presented, covering their principles, system compositions, features, developments and applications for standoff chemical detection over the last decade. In addition, a performance comparison together with the challenges and opportunities analysis is presented that describes the broad LAS-based techniques within the framework of remote sensing research and their directions of development for meeting potential practical use.

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Tunable mid-infrared laser absorption spectroscopy

Cited by 14 publications

References 171 publications

Multicomponent gas analysis using broadband quantum cascade laser spectroscopy

Multicomponent gas analysis using broadband quantum cascade laser spectroscopy

Measures for optimizing pulsed EC-QC laser spectroscopy of liquids and application to multi-analyte blood analysis

Standoff Chemical Detection Using Laser Absorption Spectroscopy: A Review

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