NDLI: Offline estimation of ring-down time for an experimental Fabry-Perot optical cavity

Content Provider	IEEE Xplore Digital Library
Author	Kallapur, A.G. Boyson, T.K. Petersen, I.R. Harb, C.C.
Copyright Year	2011
Description	Author affiliation: School of Engineering and Information Technology, University of New South Wales at the Australian Defence Force Academy, Canberra ACT 2600, Australia (Kallapur, A.G.; Boyson, T.K.; Petersen, I.R.; Harb, C.C.)
Abstract	This paper presents an application of the discrete-time extended Kalman filter (EKF) for offline estimation of the ring-down time constant of an experimental Fabry-Perot optical cavity for the purpose of cavity ring-down spectroscopy (CRDS). The ring-down time corresponds to the time taken by the light inside an optical cavity to decay to 1/e of its initial intensity. The estimation of ring-down time (or decay time) for a cavity is a direct indication of the absorbing species contained in it and can be used to detect improvised explosive devices and concealed explosives. The data for the estimation process is obtained in the form of light intensity at the output of the optical cavity from a CRDS experimental setup. During the process of data collection, the resonant frequency of the optical cavity is held in lock with the input laser frequency with the aid of a proportional-integral (PI) controller in order to allow for maximum constructive interference of light within the cavity.
Starting Page	556
Ending Page	560
File Size	1792389
Page Count	5
File Format	PDF
ISBN	9781457710629
ISSN	10851992
e-ISBN	9781457710636
e-ISBN	9781457710612
DOI	10.1109/CCA.2011.6044462
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-09-28
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Cavity resonators Estimation Fabry-Perot Optical scattering Resonant frequency Mirrors Optical recording
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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