@inproceedings{WohlschlaegerVersenLaforsch2021, author = {Wohlschl{\"a}ger, Maximilian and Versen, Martin and Laforsch, Christian}, title = {Non-destructive evaluation of treated polyethylene terephthalate films by fluorescence lifetime imaging}, series = {2021 IEEE Sensors Applications Symposium (SAS)}, booktitle = {2021 IEEE Sensors Applications Symposium (SAS)}, doi = {10.1109/SAS51076.2021.9530008}, pages = {1 -- 5}, year = {2021}, abstract = {The fluorescence decay time allows to identify and distinguish polymers from each other. Three differently treated biaxially-oriented polyethylene terephthalate films are examined with two excitation wavelengths of 445 and 488nm. The fluorescence decay time is dependent of the treatment method of the films and is a means for identification.}, language = {en} } @inproceedings{WohlschlaegerVersenHolstetal.2019, author = {Wohlschl{\"a}ger, Maximilian and Versen, Martin and Holst, Gerhard and Franke, Robert}, title = {An Approach of Identifying Polymers With Fluorescence Lifetime Imaging}, series = {2019 IEEE International Conference on Electrical Engineering and Photonics (EExPolytech)}, booktitle = {2019 IEEE International Conference on Electrical Engineering and Photonics (EExPolytech)}, pages = {186 -- 189}, year = {2019}, abstract = {Nowadays, fluorescence lifetime measurements and the method of fluorescence lifetime imaging are already state of the art in biomedical research. Also first investigations show that polymers could be identified due to their endogenous fluorescent lifetime. Thus an approach of identifying polymers with fluorescence lifetime imaging is done in this contribution. Therefore, four different polymers are examined and evaluated with statistical methods in order to determine their specific fluorescence lifetimes.}, language = {en} } @inproceedings{WohlschlaegerVersenLanghals2019, author = {Wohlschl{\"a}ger, Maximilian and Versen, Martin and Langhals, H.}, title = {A method for sorting of plastics with an apparatus specific quantum efficiency approach}, series = {2019 IEEE Sensors Applications Symposium (SAS)}, booktitle = {2019 IEEE Sensors Applications Symposium (SAS)}, year = {2019}, abstract = {Today, the automatic separation of polymers from each other in an industrial scale is an unsolved problem. In laboratory environments, two methods are known whereby plastic is sorted either by color or by fluorescence decay time measurements that require fast synchronization and thus expensive equipment. A simple and pragmatic process is proposed to separate plastics from each other: all fluorescent photons are counted in relation to the absorbed photons. A theoretical model and an experimental setup are built in order to determine an apparatus specific quantum efficiency.}, language = {en} }