Ozone Detection via Deep-Ultraviolet Cavity-Enhanced Absorption Spectroscopy with a Laser Driven Light Source

We present a novel sensing approach for ambient ozone detection based on deep-ultraviolet (DUV) cavity-enhanced absorption spectroscopy (CEAS) using a laser driven light source (LDLS). The LDLS has broadband spectral output which, with filtering, provides illumination between ~230-280 nm. The lamp l...

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Bibliographic Details
Published inSensors (Basel, Switzerland) Vol. 23; no. 11; p. 4989
Main Authors Puga, Anthony, Yalin, Azer
Format Journal Article
LanguageEnglish
Published Switzerland MDPI AG 23.05.2023
MDPI
Subjects
Absorption spectroscopy
Air pollution
Broadband
cavity-enhanced spectroscopy
deep ultraviolet
Emissions
Gas industry
Gases
Laboratories
Lasers
Light emitting diodes
Light sources
Ozone
Pollutants
Response time
Sampling
Sensors
Spectrum analysis
Ultraviolet spectroscopy
VOCs
Volatile organic compounds
Colorado
United States > US
cavity-enhanced spectroscopy
ultraviolet spectroscopy
deep ultraviolet
ozone
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Summary:We present a novel sensing approach for ambient ozone detection based on deep-ultraviolet (DUV) cavity-enhanced absorption spectroscopy (CEAS) using a laser driven light source (LDLS). The LDLS has broadband spectral output which, with filtering, provides illumination between ~230-280 nm. The lamp light is coupled to an optical cavity formed from a pair of high-reflectivity (R~0.99) mirrors to yield an effective path length of ~58 m. The CEAS signal is detected with a UV spectrometer at the cavity output and spectra are fitted to yield the ozone concentration. We find a good sensor accuracy of <~2% error and sensor precision of ~0.3 ppb (for measurement times of ~5 s). The small-volume (<~0.1 L) optical cavity is amenable to a fast response with a sensor (10-90%) response time of ~0.5 s. Demonstrative sampling of outdoor air is also shown with favorable agreement against a reference analyzer. The DUV-CEAS sensor compares favorably against other ozone detection instruments and may be particularly useful for ground-level sampling including that from mobile platforms. The sensor development work presented here can also inform of the possibilities of DUV-CEAS with LDLSs for the detection of other ambient species including volatile organic compounds.
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ISSN:1424-8220
1424-8220
DOI:10.3390/s23114989