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Proceedings Paper

Shifted excitation Raman difference spectroscopy: a potential tool for outdoor measurements in precision agriculture
Author(s): Martin Maiwald; André Müller; Jörn Selbeck; Jana Käthner; Manuela Zude; Dominique Fleury; Bernd Sumpf; Götz Erbert; Günther Tränkle
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Paper Abstract

In this work we present Shifted Excitation Raman Difference Spectroscopy (SERDS) as a potential spectroscopic tool for outdoor measurements in precision agriculture. A dual-wavelength diode laser at 785 nm is used as an excitation light source which provides an optical power up to 100 mW in cw-operation. Both emission lines for SERDS show single mode operation with a spectral width of ≤ 11 pm and a spectral distance of about 10 cm-1 over the whole power range. Raman experiments on apples are carried out and show Raman signals from wax layer and β-carotene. Raman investigations under daylight conditions are performed to simulate outdoor measurements. Here, polystyrene (PS) is used as test sample. A broadband signal together with narrow absorption lines of water vapor and Fraunhofer lines of singly ionized calcium (Ca II) mask the Raman lines of PS. Only the strong Raman signal at 999 cm-1 is visible. SERDS efficiently separates the Raman signals of PS from the background signals and a 14-fold improvement of the signal-tobackground noise ratio is achieved.

Paper Details

Date Published: 3 June 2015
PDF: 7 pages
Proc. SPIE 9488, Sensing for Agriculture and Food Quality and Safety VII, 94880G (3 June 2015); doi: 10.1117/12.2177789
Show Author Affiliations
Martin Maiwald, Ferdinand-Braun-Institut (Germany)
André Müller, Ferdinand-Braun-Institut (Germany)
Jörn Selbeck, Leibniz-Institut für Agrartechnik Potsdam-Bornim e.V. (Germany)
Jana Käthner, Leibniz-Institut für Agrartechnik Potsdam-Bornim e.V. (Germany)
Manuela Zude, Leibniz-Institut für Agrartechnik Potsdam-Bornim e.V. (Germany)
Dominique Fleury, Ecole d'Ingeniuers de Changins (Switzerland)
Bernd Sumpf, Ferdinand-Braun-Institut (Germany)
Götz Erbert, Ferdinand-Braun-Institut (Germany)
Günther Tränkle, Ferdinand-Braun-Institut (Germany)

Published in SPIE Proceedings Vol. 9488:
Sensing for Agriculture and Food Quality and Safety VII
Moon S. Kim; Kuanglin Chao; Bryan A. Chin, Editor(s)

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