Alan Lim
University of Alberta
12 Papers
76 Citations
Alan Lim is an academic researcher from University of Alberta. The author has contributed to research in topics: Laser & Quantum cascade laser. The author has an hindex of 5, co-authored 11 publications.
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Papers
Real-time monitoring of benzene, toluene, and p-xylene in a photoreaction chamber with a tunable mid-infrared laser and ultraviolet differential optical absorption spectroscopy
Matthew T. Parsons,Ihor Sydoryk,Alan Lim,Thomas J. McIntyre,John Tulip,Wolfgang Jäger,Karen McDonald +6 more
TL;DR: The EC-QCL based system provides quantitation limits of approximately 200, 200, and 600 parts in 10(9) (ppb) for benzene, toluene, and p-xylene, respectively, which represents a significant improvement over the previous work with this laser system.
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Detection of benzene and toluene gases using a midinfrared continuous-wave external cavity quantum cascade laser at atmospheric pressure
TL;DR: The application of a commercially available widely tunable continuous-wave external cavity quantum cascade laser as a spectroscopic source for the simultaneous detection of multiple gases is demonstrated.
33
Off-axis cavity enhanced spectroscopy based on a pulsed quantum cascade laser for sensitive detection of ammonia and ethylene
TL;DR: A pulsed, distributed feedback (DFB) quantum cascade (QC) laser was used in combination with an off-axis cavity enhanced absorption (CEA) spectroscopic technique for the detection of ammonia and ethylene, demonstrating detection limits of ~15 ppb and ∼20 ppb for ammonia and Ethylene, respectively, with less than 5 s averaging time.
14
Range-resolved gas concentration measurements using tunable semiconductor lasers
TL;DR: In this article, a method for range-resolved gas sensing using pathintegrated optical systems is presented, which involves dividing an absorption path into several measurement segments and extracting the gas concentration in each segment from two path-integrated measurements.
9
Wavelength modulation spectroscopy with a pulsed quantum cascade laser for the sensitive detection of acrylonitrile
TL;DR: In this paper, a pulsed, distributed feedback (DFB) quantum cascade laser centered at 957 cm−1 was used in combination with a wavelength modulation spectroscopic technique for the detection of acrylonitrile.
8