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Vol. 193, Issue 10, October 2015, pp. 63-66




Cavity Enhanced Absorption Spectroscopy in Air Pollution Monitoring


Institute of Optoelectronics, Military University of Technology, 2 Kaliskiego Str., 00908Warsaw, Poland
Tel./fax.: 0048261837943

E-mail: zbigniew.bielecki@wat.edu.pl


Received: 31 August 2015 /Accepted: 5 October 2015 /Published: 30 October 2015

Digital Sensors and Sensor Sysstems


Abstract: The paper presents some practical aspects of cavity enhanced absorption spectroscopy application in detection of nitrogen dioxide (NO2), nitrous oxide (N2O), nitric oxide (NO) and carbon monoxide (CO). These gases are very important for monitoring of environment. There are shown results of lab-setups for N2O, NO, CO detection and portable sensor of NO2. The portable instrument operates in the UV spectral range and reaches a level of single ppb. The lab–devices use high precision mid-infrared spectroscopy and they was demonstrated during testing the laboratory air. These sensors are able to measure concentration at the ppb level using quantum cascade lasers, high quality optical cavities and modern MCT detection modules. It makes it possible to apply such sensors in monitoring the atmosphere quality.


Keywords: Laser absorption spectroscopy, Cavity enhanced spectroscopy, CEAS, Gas sensors, QCL.


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