What is it about?
Non-Dispersive Infrared Spectroscopy (NDIR) is proposed for monitoring of air pollutants emitted by ship engines.
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Why is it important?
Careful optical filtering overcomes the challenge of optical detection of NO2 in humid exhaust gas, despite spectroscopic overlap with the water vapour band.
Perspectives
This paper presents an analysis of a special filter arrangement that targets this issue for NO2 by balancing out the water vapour signal in two simultaneous measurements with two accurately designed and manufactured optical filters.
Dr Gary J Hawkins
University of Reading
Read the Original
This page is a summary of: In Optics Humidity Compensation in NDIR Exhaust Gas Measurements of NO2, January 2014, Optical Society of America (OSA),
DOI: 10.1364/sensors.2014.seth1c.3.
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