Title :
Detection of ammonia in near infrared region considering the effect of cross sensitivity
Author :
Hussin, Nabihah ; Idrus, Sevia Mahdaliza ; Ibrahim, Mohd Haniff ; Supa´at, Abu Sahmah
Author_Institution :
Lightwave Commun. Res. Group, Univ. Teknol. Malaysia, Skudai, Malaysia
Abstract :
Most people are exposed to ammonia from inhalation of the gas or vapours. Since ammonia exists naturally and is also present in cleaning products, exposure may occur from these sources. The widespread use of ammonia on farms and in industrial and commercial locations also means that exposure can occur from an accidental release or from a deliberate terrorist attack. UV or broadband IR absorption, and Photothermal Deflection avoid the species-conversion, time delay, and adsorption problems associated with traditional sampling systems, but often use expensive, bulky or delicate radiation sources that are not suitable for commercialization. Many optical techniques also employ derivative or FM spectroscopy to increase sensitivity, but require calibration gases to provide reference signals and have complicated lineshapes due to the overlapping of multiple NH3 absorption lines in. This is a strong indication that cross sensitivity for ammonia emission monitoring must be model.
Keywords :
ammonia; calibration; gas sensors; infrared spectra; photothermal effects; ultraviolet spectra; FM spectroscopy; NH3; UV absorption; accidental release; ammonia detection; ammonia emission monitoring; broadband IR absorption; calibration gases; commercial locations; complicated lineshapes; cross sensitivity effect; deliberate terrorist attack; industrial locations; near infrared region; photothermal deflection; reference signals; sampling systems; Absorption; Atmospheric measurements; Atmospheric modeling; Gases; Optical sensors; Pollution measurement; Sensitivity; IR absorption; ammonia; lineshapes; optical technique; overlapping;
Conference_Titel :
Communications (APCC), 2012 18th Asia-Pacific Conference on
Conference_Location :
Jeju Island
Print_ISBN :
978-1-4673-4726-6
Electronic_ISBN :
978-1-4673-4727-3
DOI :
10.1109/APCC.2012.6388237