This paper demonstrates the results of measuring the concentration of methane in atmospheric air using the developed laser Raman spectrometer. The integrated intensity method is used to determine concentrations from experimental spectra. Two methods of background correction near the methane peak are considered. It was found that the sensitivity limit of the spectrometer is less than 100 ppb. A comparison between measurements obtained using the presented setup and the CRDS gas analyzer showed sufficient agreement.
Surface-enhanced Raman spectroscopy is a promising method for analysis of gas media composition. In this work we present an analysis of resonant metal-dielectric holographic gratings providing an essential local field enhancement due to excitation of the surface plasmon-polaritons. It is shown that structure parameters yielding an optimum far-field resonance excitation are not necessarily correspond to optimum local field maximum.
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.