27 August 2003 Development of a portable carbon monoxide optical sensor based on an extended cavity diode laser at 1564 nm
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Abstract
Carbon monoxide (CO) is a major trace gas pollutant with road traffic being responsible for most emissions. Tunable diode laser absorption spectroscopy will be used to measure CO in vehicle emissions, thereby identifying offenders. A portable device will be constructed, which is capable of measuring CO at concentrations of 10 ppm. Design emphasis is on using low cost commercial components. An extended cavity diode laser (ECDL) will be used offering a narrow line width (» 350 kHz) and operated at 1564 nm (near infrared) to allow detection of the CO line R(13). This wavelength has been selected primarily because commercial optics components designed for the telecommunications industry at 1550 nm are readily available and relatively inexpensive. A potential tuning range of 20 nm about the central wavelength for the ECDL also offers potential for detection of other combustion related, gas species in this spectral region using the same diode laser. Novel optical arrangements allowing longer absorption path lengths and hence increased sensitivity of the CO sensor will be investigated. In addition to road traffic pollution measurements, the device will be adapted for use with fibre optic technology, to facilitate air quality measurements in remote locations e.g. stack emissions.
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Eva S. Norris, Sile G. Nic Chormaic, "Development of a portable carbon monoxide optical sensor based on an extended cavity diode laser at 1564 nm", Proc. SPIE 4876, Opto-Ireland 2002: Optics and Photonics Technologies and Applications, (27 August 2003); doi: 10.1117/12.464002; https://doi.org/10.1117/12.464002
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