Simulation and measurement of carbon dioxide exhaust emissions using an optical-fibre-based mid-infrared point sensor

• Published in: Journal of optics. A, Pure and applied optics Pure and applied optics, 2009-05, Vol.11 (5), p.054013-054013 (7)
• Main Authors: Muda, Razali, Dooly, Gerard, Clifford, John, Mulrooney, Jim, Flavia, Gili, Merlone-Borla, Edoardo, Chambers, Paul, Fitzpatrick, Colin, Lewis, Elfed
• Format: Article
• Language: English
• Subjects: Bolometer; infrared, submillimeter wave, microwave and radiowave receivers and detectors; Exact sciences and technology; Fiber optics; Fundamental areas of phenomenology (including applications); General equipment and techniques; Infrared, submillimeter wave, microwave and radiowave instruments, equipment and techniques; Instruments, apparatus, components and techniques common to several branches of physics and astronomy; Optics; Physics; Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing; Sensors, gyros
• ISSN: 1464-4258; 1741-3567
• DOI: 10.1088/1464-4258/11/5/054013

A novel optical-fibre-based sensor for measurement of CO2 gas emission concentrations in exhaust systems of a motor vehicle is reported. The sensing principle is based on open-path direct absorption spectroscopy in the mid-infrared range. The sensor system comprises of low cost and compact mid-infrared components, which make it suitable for insertion into the exhaust system of automotive vehicles. The sensor utilizes a calcium fluoride CaF2 narrow band pass (NBP) filter for detection of CO2 gas without cross-sensitivity to other gases present in the exhaust system. Furthermore, it can be integrated into the mechanical and electronic interface systems of existing vehicles without any problems.