TY - JOUR A1 - Maniyattu, Georgekutty Jose A1 - Geegy, Eldho A1 - Wohlschläger, Maximilian A1 - Leiter, Nina A1 - Versen, Martin A1 - Laforsch, Christian T1 - Multilayer Perceptron Development to Identify Plastics Using Fluorescence Lifetime Imaging Microscopy JF - EDFA Technical Articles N2 - Existing plastic analysis techniques such as Fourier transform infrared spectroscopy and Raman spectroscopy are problematic because samples must be anhydrous and identification can be hindered by additives. This article describes a new approach that has been successfully demonstrated in which plastics can be classified by neural networks that are trained, validated, and tested by frequency domain fluorescence lifetime imaging microscopy measurements. Y1 - 2023 U6 - https://doi.org/10.31399/asm.edfa.2023-3.p031 VL - 25 IS - 3 SP - 31 EP - 37 ER - TY - CHAP A1 - Schwarz, Jonas A1 - Wohlschläger, Maximilian A1 - Leiter, Nina A1 - Auer, Veronika A1 - Risse, Michael A1 - Versen, Martin T1 - Frequency Domain Fluorescence Lifetime Imaging Microscopy (FD-FLIM) analysis of Quercus robur samples for origin differentiation purposes T2 - Optica Sensing Congress 2023 (AIS, FTS, HISE, Sensors, ES) N2 - Increasing demand for wood products requires methods to determine its harvest origin and ensure sustainable and legal sourcing. In 15 out of 21 cases, the origin of Quercus robur was differentiable in FD-FLIM studies. KW - Fluorescence lifetime imaging KW - Phase shift KW - Phase modulation KW - Laser sources KW - Bandpass filters KW - Frequency modulation Y1 - 2023 U6 - https://doi.org/10.1364/AIS.2023.JTu4A.10 ER - TY - CHAP A1 - Versen, Martin A1 - Kipfelsberger, Stefan ED - Schäfle, Claudia ED - Stanzel, Silke ED - Junker, Elmar ED - Lux, Christine T1 - An Applied Examination Format for Measurement Technologies T2 - Proceedings of the 12th International Conference on Physics Teaching in Engineering Education PTEE 2024 N2 - A written exam in measurement technologies usually includes problems for operational amplifier circuits, error propagation, signal analysis and analog to digital conversion. During corona, teaching changed from presence lectures to remote lectures and examination formats changed, too. Instead of a written exam, student project exams were proposed. The projects included a computer aided temperature measurement with operational amplifier circuits, a calibration procedure, error propagation and a written report. The student project exams were successful and the students’ feedback was so positive that the student project exams are going to be continued. T3 - Proceedings of the 12th International Conference on Physics Teaching in Engineering Education PTEE 2024 - 1 KW - measurement technology KW - examination Y1 - 2024 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:861-opus4-25878 SP - 96 EP - 101 ER - TY - JOUR A1 - Versen, Martin A1 - Wohlschläger, Maximilian A1 - Langhals, Heinz A1 - Laforsch, Christian T1 - The detection of organic polymers as contaminants in foodstuffs by means of the fluorescence decay of their auto fluorescence JF - Food and Humanity N2 - Products such as food can become contaminated during their manufacture or afterwards. Depending on the type of substance causing the contamination, these contaminants can be harmful to health and difficult to detect by visible inspection. The suitability of fluorescence decay and FD-FLIM for the detection of plastics contamination in foodstuffs is demonstrated. Therefore, a procedure for the detection of contaminating organic polymers (plastics) in processed meat such as salami by means of the fluorescence decay time of auto fluorescence is described. The auto fluorescence of processed meat was found to decay according to first order with a typical time constant of about 2 ns, whereas the time constant of significant polymers for the processing of meat is generally appreciably higher (2.5 ns – 5.5 ns depending on the polymer). As a consequence, contaminating organic polymers can not only be globally detected by means of the fluorescence decay but also localised in two-dimensional imaging. The present study reports a high potential of FD-FLIM for rapidly identifying and differentiating different plastics on and in different foodstuffs. The method allows an improved quality control of foodstuffs. KW - Fluorescence KW - Decay constant KW - Foodstuff KW - Imaging KW - Quality control KW - Organic polymers Y1 - 2024 U6 - https://doi.org/10.1016/j.foohum.2024.100363 VL - 3 ER - TY - GEN A1 - Heitzmann, Sebastian A1 - Kallweit, Stephan A1 - Brunn, André A1 - Holst, Gerhard A1 - Leiter, Nina A1 - Wohlschläger, Maximilian A1 - Versen, Martin T1 - Erweiterung eines FD-FLIM Messsystems durch MQTT Anbindung eines Roboters zur automatischen Sortierung von Altholzklassen T2 - Tagungsband AALE 2025: Menschenzentrierte Automation im digitalen Zeitalter N2 - Ziel des Projektes Fluoreszenz ID von Altholz (FrIDAH)5 ist die Entwicklung eines Demonstrators gewesen, welcher die automatisierte Sortierung von Altholzproben gemäß der Altholzverordnung unter Verwendung der Messung von Fluoreszenzabklingzeiten ermöglicht. In diesem Beitrag werden der entwickelte Messaufbau, die Software, das Automatisierungssystem, sowie der Klassifikator vorgestellt. Die Ergebnisse zeigen, dass die verwendete Technologie zur zuverlässigen Klassifikation von Altholz geeignet ist und für die automatisierte Sortierung angewendet werden kann. Y1 - 2025 U6 - https://doi.org/10.33968/2025.16 SP - 147 EP - 156 ER - TY - GEN A1 - Stegemann, V. A1 - Morbitzer, A. A1 - Püschel, M. A1 - Heitzmann, S. A1 - Kipfelsberger, S. A1 - Versen, Martin T1 - Sensorfusion einer KI-gestützten Objekterkennung mit Positionsmessung T2 - Tagungsband AALE 2025: Menschzentrierte Automation im digitalen Zeitalter N2 - Für eine Automatisierungslösung wird ein von künstlicher Intelligenz gestütztes System zur Detektion von unterschiedlichen Objekten sowie deren Positionsmessung entwickelt. Die Objekterkennung erfolgt unter Verwendung eines Jetson Nano von Nvidia. Zur Positionsbestimmung auf einem Förderband wird ein Inkrementaldrehgeber ROD 420 eingesetzt. Der Positionswert wird mit einem selbst entwickelten Messsystem auf einem Arty A7 Field Programmable Gate Array (FPGA) errechnet und zur Sensorfusion an den Jetson Nano übertragen. Y1 - 2025 U6 - https://doi.org/10.33968/2025.42 SP - 395 EP - 404 ER -