One of the main challenges in remote Fourier transform infrared (FT-IR) spectroscopy is the collection of a
reliable background spectrum. Although suggested as a method to address the problem in prior literature,
super clip apodization (SCA) has had little reported success for wide spectral features. SCA is a technique that
involves the manipulation of different parts of the interferogram to calculate an absorbance spectrum from a
single interferogram. A new method called complementary super clip apodization (CSCA) is developed here and
is successfully used in conjunction with SCA in an iterative optimization algorithm. The umbrella term of super
clip mathematics is also defined to encompass spectral calculation using SCA, CSCA or both in combination.
The validity of super clip mathematics is demonstrated in an experimental study of gas-phase nitromethane. In
an effort to mimic errors present in standoff detection, uniformly distributed noise and/or wavenumber shifting
is added to the interferometric sample data to test the robustness of the algorithm. It will be shown that the
implementation of SCA and CSCA in combination is more successful for concentration assessment than using
SCA or CSCA alone.
Peter Kuffner, Kathryn Conroy, Toby Boyson, Greg Milford, Mohamed Mabrok, Abhijit Kallapur, Ian Petersen, Maria Calzada, Thomas Spence, Kennith Kirkbride, Charles Harb
A consortium of researchers at University of New South Wales (UNSW@ADFA), and Loyola University New
Orleans (LU NO), together with Australian government security agencies (e.g., Australian Federal Police), are
working to develop highly sensitive laser-based forensic sensing strategies applicable to characteristic substances
that pose chemical, biological and explosives (CBE) threats. We aim to optimise the potential of these strategies
as high-throughput screening tools to detect prohibited and potentially hazardous substances such as those
associated with explosives, narcotics and bio-agents.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.