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Energy Express

  • Editor: Bernard Kippelen
  • Vol. 19, Iss. S4 — Jul. 4, 2011
  • pp: A725–A732

Phase-sensitive method for background-compensated photoacoustic detection of NO2 using high-power LEDs

Jaakko Saarela, Tapio Sorvajärvi, Toni Laurila, and Juha Toivonen  »View Author Affiliations

Optics Express, Vol. 19, Issue S4, pp. A725-A732 (2011)

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A photoacoustic (PA) sensor has been developed for the detection of nitrogen dioxide (NO2). Ten amplitude-modulated high-power light emitting diodes (LEDs), emitting a total optical power of 9 W at 453 nm, are used to excite the photoacoustic signal in NO2. The LEDs are attached to the circumference of a cylindrical PA cell. The induced longitudinal acoustics waves are detected using two electromechanical film stacks, located at the ends of the cell. Background signal cancelation is achieved by using phase-sensitive detection of the difference signal of the two pressure transducers. The phase-sensitive approach allows for improved dynamic range and sensitivity. A detection limit of 10 parts per billion by volume was achieved for flowing NO2 gas sample in an acquisition time of 2.1 s, corresponding to a minimum detectable absorption coefficient of 1.6 × 10−7 cm−1 Hz−1/2. The developed sensor has potential for compact, light-weight, and low-cost measurement of NO2.

© 2011 OSA

OCIS Codes
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(230.3670) Optical devices : Light-emitting diodes
(300.6380) Spectroscopy : Spectroscopy, modulation
(300.6430) Spectroscopy : Spectroscopy, photothermal
(120.5475) Instrumentation, measurement, and metrology : Pressure measurement

ToC Category:
Remote Sensing and Sensors

Original Manuscript: April 14, 2011
Revised Manuscript: May 18, 2011
Manuscript Accepted: May 19, 2011
Published: May 26, 2011

Virtual Issues
Vol. 6, Iss. 8 Virtual Journal for Biomedical Optics

Jaakko Saarela, Tapio Sorvajärvi, Toni Laurila, and Juha Toivonen, "Phase-sensitive method for background-compensated photoacoustic detection of NO2 using high-power LEDs," Opt. Express 19, A725-A732 (2011)

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