Shifted excitation Raman difference spectroscopy: a potential tool for outdoor measurements in precision agriculture

Martin Maiwald; André Müller; Jörn Selbeck; Jana Käthner; Manuela Zude; Dominique Fleury; Bernd Sumpf; Götz Erbert; Günther Tränkle

doi:10.1117/12.2177789

3 June 2015 Shifted excitation Raman difference spectroscopy: a potential tool for outdoor measurements in precision agriculture

Martin Maiwald, André Müller, Jörn Selbeck, Jana Käthner, Manuela Zude, Dominique Fleury, Bernd Sumpf, Götz Erbert, Günther Tränkle

Author Affiliations +

Proceedings Volume 9488, Sensing for Agriculture and Food Quality and Safety VII; 94880G (2015) https://doi.org/10.1117/12.2177789
Event: SPIE Sensing Technology + Applications, 2015, Baltimore, MD, United States

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.

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Martin Maiwald, André Müller, Jörn Selbeck, Jana Käthner, Manuela Zude, Dominique Fleury, Bernd Sumpf, Götz Erbert, and Günther Tränkle "Shifted excitation Raman difference spectroscopy: a potential tool for outdoor measurements in precision agriculture", Proc. SPIE 9488, Sensing for Agriculture and Food Quality and Safety VII, 94880G (3 June 2015); https://doi.org/10.1117/12.2177789

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