Abstract
Miniaturised MEMS-based Fabry-Pérot interferometer (FPI) spectral sensors allow the design of compact spectrometers in the near infrared (NIR) range. These small-size instruments can be used for quality control of alimentation products, sorting of plastics and fabrics in respect to the material composition or defining genuineness of goods. This article describes design details and achieved results in development of an inexpensive user friendly hand-held NIR spectrometer incorporating a MEMS-FPI sensor with the spectral range of 1550–1850 nm. Implemented electronic circuitry as well as the optical configuration of the device are discussed, used electronic components and the background for the choice of the light source are presented. Furthermore, the associated software for device operation and data visualisation is described. Achieved technical parameters of the device are discussed and illustrated by examples of acquired spectra. Shared experience in operating a MEMS-FPI sensor could be especially useful for designers targeting low-cost instruments for use by general public.
Zusammenfassung
Miniaturisierte MEMS basierte Spektralsensoren mit Fabry-Pérot Interferometer (FPI) erlauben die Entwicklung von kompakten Spektrometern im nahen Infrarotbereich (NIR). Beispielhafte Anwendungen finden sich im Bereich der Qualitätskontrolle von Lebensmitteln und dem Sortieren von Kunststoffen und Textilien. Dieser Artikel beschreibt die Entwicklungspunkte und -ergebnisse eines kostengünstigen NIR Spektrometer, welches als benutzerfreundliches Handgerät unter Verwendung eines MEMS-FPI Sensors in einem spektralen Wellenlängenbereich von 1550–1850 nm arbeitet. Dabei wird neben dem elektronischen Aufbau des Gerätes die optische Konfiguration um den Spektralsensor diskutiert. Weiterhin umfasst der Inhalt die Umsetzung der zugehörigen Softwareanwendungen für den Betrieb und die Datenvisualisierung von Messungen. Anhand einiger Beispiele von aufgenommenen spektralen Verteilungen wird final ein Vergleich zu weiteren Marktlösungen angestellt. Die geteilten Erfahrungen haben einen speziellen Nutzen für kommerzielle Entwickler mit Anforderung an niedrige Produktkosten.
About the authors
Artem Ivanov has been professor and head of the hybrid electronics lab at Landshut University of Applied Sciences since 2011. His current fields of teaching and research activity are electronics engineering, manufacturing and packaging technologies, printed electronics and embedded systems. He graduated in physics from the Novosibirsk State University and received his PhD from the University of Cologne. During his time in the industry Artem Ivanov worked on different sensor technologies ranging from long range capacitive detection to x-ray energy dispersive detectors, he holds more than forty international patents.
Arne Kulinna is a master’s degree student in Applied Research in Engineering Sciences at the University of Applied Sciences Landshut, Germany. Previously he graduated as a Bachelor of Science in Automotive Computer Science at the same University. In context of an exchange semester at the Clemson University, SC, USA he received a scholarship from the German Academic Exchange Service. Beginning his educational career with a professional training as mechatronics engineer at a global automobile manufacturer he gathered a broad range of experience in a variety of fields. However, currently his focus is on low-level software development in embedded systems.
Acknowledgment
Authors would like to acknowledge Landshut University of Applied Sciences for financial and technical support as well as Hamamatsu Photonics Deutschland GmbH for providing their C15713 spectral module for the reference measurements.
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