Cart (Loading....) | Create Account
Close category search window
 

Trace detection of C2H4 by photoacoustic spectroscopy with a compact pulsed optical parametric oscillator

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

3 Author(s)
Tse-Luen Wee ; Inst. of Atomic & Molecular Sci., Acad. Sinica, Taipei, Taiwan ; Ng, J. ; Kung, A.H.

A periodically poled lithium niobate (PPLN) optical parametric oscillator using a simple grazing-incidence grating cavity configuration (GIOPO) for broad and fast wavelength tuning has been developed for the mid-infrared region. The GIOPO is capable of producing ∼100 mW of infrared power with a bandwidth of 0.2 cm-1 at 3000 nm. Since pressure-broadened linewidths are in the range of a few tenths of a wavenumber, the GIOPO output bandwidth is suitable for exciting single well-separated rotational lines of many gases under typical atmospheric conditions. We have used the highly sensitive technique of photoacoustic detection coupled with this compact all solid-state GIOPO developed in our laboratory to achieve ppb level detection and analysis of gaseous molecules. Result shows a photoacoustic spectrum taken with 1 ppmV of C2H4 in comparison with a FTIR spectrum. The PA spectrum has a resolution of 0.2 cm-1, clearly distinguishing the rotational structure of the molecule. A plot of the PA signal as a function of C2H4 gas concentration is also obtained. A linear relationship between the C2H4 concentration and the PA signal is established over at least two decades of gas concentration. A minimum sensitivity of 10 parts in 109 by volume (10 ppbV) C2H4 in nitrogen was obtained in the direct measurement. The current limit on the detection sensitivity is determined by the background, noise and the accuracy is mainly determined by calibration errors involved in the gas mixing procedure. In order to improve on the sensitivity, a multipass cell arrangement is being designed.

Published in:

Lasers and Electro-Optics, 2003. CLEO/Pacific Rim 2003. The 5th Pacific Rim Conference on  (Volume:2 )

Date of Conference:

15-19 Dec. 2003

Need Help?


IEEE Advancing Technology for Humanity About IEEE Xplore | Contact | Help | Terms of Use | Nondiscrimination Policy | Site Map | Privacy & Opting Out of Cookies

A not-for-profit organization, IEEE is the world's largest professional association for the advancement of technology.
© Copyright 2014 IEEE - All rights reserved. Use of this web site signifies your agreement to the terms and conditions.