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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 50, Iss. 25 — Sep. 1, 2011
  • pp: 4936–4941

Performance of the photoacoustic resonant cell remodified from Helmholtz cavity

Junjuan Zhao, Zhan Zhao, Lidong Du, and Shaohua Wu  »View Author Affiliations


Applied Optics, Vol. 50, Issue 25, pp. 4936-4941 (2011)
http://dx.doi.org/10.1364/AO.50.004936


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Abstract

This paper presents the method and performance of the photoacoustic resonant cell remodified from a Helmholtz cavity that can be used to improve excitation of acoustical signal of the photoacoustic cell by photoacoustic effect. The other advantages of this method are that it can be used to detect flowing trace gases and it has small volume. In our experiments, the conventional nonresonant cell, the original Helmholtz resonant cell, and the remodified Helmholtz resonant cell were designed and tested respectively, based on the measurement of the CO 2 contribution of the photoacoustic signal. The nonresonance test of the trace gas analyte CO 2 conducted at 125 Hz demonstrated signal about 4 mV for CO 2 concentrations at 300 ppm and signal-to-noise (S/N) value ( 32 1 ). The original Helmholtz resonant test of the same analyte gas conducted at its resonant frequency demonstrated signal about 43 mV and S/N value ( 340 1 ). The remodified Helmholtz resonant test of the same analyte gas conducted at its resonant frequency demonstrated large signal about 67 mV and high S/N value ( 536 1 ). The test results show that the remodified Helmholtz photoacoustic resonant cell has a more outstanding measuring performance and more sensitivity compared to the two others.

© 2011 Optical Society of America

OCIS Codes
(040.0040) Detectors : Detectors
(140.0140) Lasers and laser optics : Lasers and laser optics
(300.0300) Spectroscopy : Spectroscopy

ToC Category:
Spectroscopy

History
Original Manuscript: April 29, 2011
Revised Manuscript: June 28, 2011
Manuscript Accepted: July 5, 2011
Published: August 24, 2011

Citation
Junjuan Zhao, Zhan Zhao, Lidong Du, and Shaohua Wu, "Performance of the photoacoustic resonant cell remodified from Helmholtz cavity," Appl. Opt. 50, 4936-4941 (2011)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-50-25-4936

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