Development of an Ultra-Low Concentration N2O Analyzer Using Quantum Cascade Laser (QCL)

2010-01-1291

04/12/2010

Event
SAE 2010 World Congress & Exhibition
Authors Abstract
Content
Green House Gas (GHGs) emission reduction has gained large prominence globally due to the climate change. Nitrous Oxide (N₂O) emission from transportation has significant share on global warming. Therefore, an instrument for sensing ultra-low level of N₂O is a key global demand. In this study, development of an instrument based on the Quantum Cascade Laser (QCL) has been attempted for measuring ultra-low level N₂O in automobile exhaust gas sampled in a sample storage bag. The QCL can emit coherent lights in a mid-infrared (Mid-IR) region where N₂O shows strong absorption peak. This absorption peak can be detected by an MCT (Mercury Cadmium Tellurium) type photovoltaic detector. The optics configuration used in this study can give a superfine resolution of the Mid-IR spectrum such as 0.002 cm-₁ in the target wavelength band. Therefore, utilizing this spectrometer, measurement of ultra-low level N₂O is possible without interference of co-existing gases. The instrument developed has been evaluated using actual engine exhaust to confirm the interference of co-existing gases, measurement accuracy and repeatability. Very low detection limit (less than 5 ppb) has been achieved. The instrument exhibits excellent linearity, therefore can be calibrated easily with standard gas. The rise time (T₁₀-T₉₀) is shorter than 5 seconds.
Meta TagsDetails
DOI
https://doi.org/10.4271/2010-01-1291
Pages
11
Citation
Montajir, R., "Development of an Ultra-Low Concentration N2O Analyzer Using Quantum Cascade Laser (QCL)," SAE Technical Paper 2010-01-1291, 2010, https://doi.org/10.4271/2010-01-1291.
Additional Details
Publisher
Published
Apr 12, 2010
Product Code
2010-01-1291
Content Type
Technical Paper
Language
English