P47 - Portable Raman sensor systems for life sciences and agri-photonics – from light sources to field measurements –
- Event
- SMSI 2023
2023-05-08 - 2023-05-11
Nürnberg - Band
- Poster
- Chapter
- Poster
- Author(s)
- B. Sumpf, M. Braune, J. Gleim, A. Müller, K. Sowoidnich, M. Vastag, L. Wittenbecher, T. Filler, N. Lobo-Ploch, M. Maiwald - Ferdinand-Braun-Institut, Berlin (Germany)
- Pages
- 370 - 371
- DOI
- 10.5162/SMSI2023/P47
- ISBN
- 978-3-9819376-8-8
- Price
- free
Abstract
Raman spectroscopy is a well-established non-invasive label-free optical measurement technique for the analysis of numerous substances in various application fields, e.g., process control, food safety and quality control, the detection of hazardous compounds, e.g., explosives, and narcotics, and the analysis of minerals. Finally, also the application in medicine, e.g., for point-of-care diagnostics, is promising. Nevertheless, in several fields, when disturbing signals like fluorescence from the sample itself occurs or background light from the sun or artificial light sources cannot be avoided, the weak Raman signals are obscured. Beside mathematical techniques to simulate the disturbing signals and subtract the obtained background spectra from the measured signals, physical approaches have the advantage of a direct separation of desired and interfering spectral contributions. Here, beside the selection of the excitation wavelength or the utilization of the different temporal behavior of fluorescence and Raman signals, several methods using multiple laser wavelengths within a narrow spectral range for the excitation of the Raman effect can be implemented. The underlying effect in this case is that the Raman signals follow the change in the excitation wavelength whereas the background signals remain mainly constant.