@misc{MoellmannVollmer2014, author = {M{\"o}llmann, Klaus-Peter and Vollmer, Michael}, title = {The Basics Science and History of Thermal Imaging}, year = {2014}, language = {en} } @article{WangHarthPuzyrevetal.2022, author = {Wang, Jing and Harth, Kirsten and Puzyrev, Dmitry and Stannarius, Ralf}, title = {The effect of obstacles near a silo outlet on the discharge of soft spheres}, series = {New Journal of Physics}, volume = {24}, journal = {New Journal of Physics}, publisher = {IOP}, doi = {10.1088/1367-2630/ac8bea}, year = {2022}, language = {en} } @article{Vollmer2022, author = {Vollmer, Michael}, title = {The evolution of IR imaging: What's next?}, series = {Laser Focus World Magazine}, journal = {Laser Focus World Magazine}, publisher = {endeavor business media}, pages = {23 -- 26}, year = {2022}, abstract = {The vast majority of all human sensory inputs occur through our eyes. Light from direct sources or scattered light from objects enters our eyes and is focused onto the retina. The resulting signals are interpreted by the brain, which leads to the perception of the image of the observed objects. Although quite efficient for our daily life, many technological applications require sensor properties beyond the characteristics of our eyes. A major limitation regarding microscopic objects is spatial resolution, which is overcome by microscopes. Time resolution can be dealt with using either time-lapse or high-speed cameras. Finally, eyes only detect visible radiation within the wavelength range from about 380 nm to 780 nm. Changing the detected spectral range of electromagnetic radiation can dramatically enhance our vision. Shorter wavelengths such as x-rays are valuable tools for medical imaging, while ultraviolet (UV) imaging is used for forensics. Longer-wavelength thermal radiation used for imaging is often defined within spectral ranges, characterized by the photoelectric detector materials used and the respective atmospheric windows.}, language = {de} } @article{AmanAmanHintzetal.2017, author = {Aman, Sergej and Aman, Alexander and Hintz, Werner and Tr{\"u}e, Michael and Veit, Peter and Hirsch, S{\"o}ren}, title = {The Exfoliation of Graphite Particles in the Vibratory Disk Mill}, series = {Chemie Ingenieur Technik}, volume = {89}, journal = {Chemie Ingenieur Technik}, number = {9}, doi = {10.1002/cite.201600124}, pages = {1185 -- 1191}, year = {2017}, language = {en} } @article{Vollmer2019, author = {Vollmer, Michael}, title = {The freezing of lakes in winter}, series = {European Journal of Physics}, journal = {European Journal of Physics}, number = {Ausgabe: 3/ Band: 40}, publisher = {IOP Publishing}, issn = {1367-2630}, doi = {10.1088/1361-6404/ab07f8}, year = {2019}, abstract = {Freezing of lakes is described using a simplified one-dimensional model, which gives ice thickness, ice growth rates, and ice surface temperature as a function of time. Model data for a specific lake with known meteorological conditions are compared to estimated ice thickness using a simple optical method. Finally, more advanced potential students projects are briefly discussed and results of a numerical solution are compared to the simplified model.}, language = {en} } @inproceedings{VollmerMoellmann2013, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter}, title = {The magic of the invisible: using IR imaging in physics education}, series = {In: InfraMation proceedings / Infrared Training Center. - Vol. 14 (2013)}, booktitle = {In: InfraMation proceedings / Infrared Training Center. - Vol. 14 (2013)}, year = {2013}, language = {en} } @misc{Vollmer2013, author = {Vollmer, Michael}, title = {The magic of the invisible: using IR imaging in physics education}, year = {2013}, language = {en} } @article{VollmerMoellmannShaw2015, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter and Shaw, Joseph A.}, title = {The optics and physics of near infrared imaging}, series = {Proceedings of SPIE 9793, Education and Training in Optics and Photonics: ETOP 2015, 97930Z (October 8, 2015)}, journal = {Proceedings of SPIE 9793, Education and Training in Optics and Photonics: ETOP 2015, 97930Z (October 8, 2015)}, doi = {10.1117/12.2223094}, year = {2015}, abstract = {abstract A large part of photonics research and development, as well as commercial applications such as optical data transmission or infrared thermal imaging, occurs in the infrared spectral range between 0.8 μm and 15 μm. However, relatively little material is so far available for experimentally teaching the physics and optics of this spectral range. We report a respective new approach in the near infrared (NIR) range between 0.8 μm and 1.7 μm that allows visualization of a number of fascinating physics phenomena. First, we use the near-infrared sensitivity of silicon-based detectors in rather inexpensive video cameras and digital single-lens reflex cameras by removing the infrared-blocking filter and replacing it with a visible-radiation blocking filter. Second, we utilize modern NIR cameras based on InGaAs detectors. With both camera types we illustrate and explain a number of physics concepts that are especially suitable for curricula in optics and photonics. Examples include the strangely bright appearance of vegetation, contrast enhancement between clouds and sky, the initially surprising differences of optical material properties between the VIS and NIR range, the possibilities of visualizing buried hidden structures and texts, and recent medical applications to locate blood vessels below the skin. © (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.}, language = {en} } @article{LachowskiHammermeisterHalenzetal.2023, author = {Lachowski, Krzysztof and Hammermeister, Florian and Halenz, Bastian and Lieckefett, Florian and G{\"o}tze, Thomas and Prill, Robert and Becker, Roland}, title = {The Patellostabilometer: A New Device for Quantification of Mediolateral Patella Displacement}, series = {Sensors}, journal = {Sensors}, number = {23 (3)}, publisher = {MDPI}, doi = {https://doi.org/10.3390/s23031274}, year = {2023}, abstract = {Mediolateral patella displacement is of interest for diagnostics and clinically relevant research questions. Apart from manual testing, no standardized method is currently available. Proper quantification of patella mobility is necessary to better understand pathologies at the patellofemoral joint. Patella mobility was assessed in 25 healthy individuals using a Patellostabilometer, a new prototype instrument for quantification of the mediolateral patella displacement. The participants underwent measurements of the mediolateral displacement three times using the Patellostabilome- ter. A maximal force of 10 N was applied for patella movement. Additionally, leg length and circumference of the knee, upper- and lower-leg were measured. Lateral patella displacement of 18.27 ± 3.76 mm (range 15.85-20.64 mm, interquartile range (IQR) of 4.79) was measured. The medial patella displacement showed 24.47 ± 6.59 mm (range 19.29-29.76 mm, IQR of 10.47). The test-retest measurement error was 2.32 ± 1.76 mm (IQR of 2.38 mm), with five outliers. There was greater test-retest variability between the measurements of the medial displacement compared to the lateral one. The test-retest variability reached 7\% of the patella displacement. Other parameters provided no significant correlations. Based on the natural patellofemoral mobility, a precise and clinically relevant quantification of patella mobility is allowed.}, language = {en} } @article{MangoldShawVollmer2013, author = {Mangold, Klaus and Shaw, Joseph A. and Vollmer, Michael}, title = {The physics of near-infrared photography}, series = {In: European journal of physics 34 (2013) 6, S51-S71}, journal = {In: European journal of physics 34 (2013) 6, S51-S71}, doi = {doi:10.1088/0143-0807/34/6/S51}, pages = {S51 -- S71}, year = {2013}, abstract = {The physics behind the sometimes strange effects and 'unnatural' appearance of near-infrared (NIR) photographs is discussed in terms of reflection, absorption and transmission of NIR radiation with the respective objects. Besides discussing how NIR cameras work, several visible and NIR photograph pairs are presented, which include vegetation, natural water, clouds, the sky, and humans. In addition, some physics-oriented experimental NIR images are presented which clearly demonstrate some of the basic physics behind some of these awesome sights.}, language = {en} } @article{StannariusHarth2023, author = {Stannarius, Ralf and Harth, Kirsten}, title = {The structure of disintegrating defect clusters in smectic C freely suspended films}, series = {Soft Matter}, journal = {Soft Matter}, number = {19}, publisher = {Royal Society of Chemistry}, doi = {https://doi.org/10.1039/d3sm00808h}, pages = {6109 -- 6115}, year = {2023}, abstract = {Disclinations or disclination clusters in smectic C freely suspended films with topological charges larger than one are unstable. They disintegrate, preferably in a spatially symmetric fashion, into single defects with individual charges of +1, which is the smallest positive topological charge allowed in polar vector fields. While the opposite process of defect annihilation is well-defined by the initial defect positions, disintegration starts from a singular state and the following scenario including the emerging regular defect patterns must be selected by specific mechanisms. We analyze experimental data and compare them with a simple model where the defect clusters adiabatically pass quasi-equilibrium solutions in one-constant approximation. It is found that the defects arrange in geometrical patterns that correspond very closely to superimposed singular defect solutions, without additional director distortions. The patterns expand by affine transformations where all distances between individual defects scale with the same time-dependent scaling factor proportional to the square-root of time.}, language = {en} } @article{PlaninsicVollmer2008, author = {Planinsic, G. and Vollmer, Michael}, title = {The surface to volume ratio in thermal physics: from cheese cube physics to animal metabolism}, series = {In: European Journal of Physics 29 (2008), 369-384}, journal = {In: European Journal of Physics 29 (2008), 369-384}, issn = {0143-0807}, pages = {369 -- 384}, year = {2008}, language = {en} } @article{VollmerMoellmann2015, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter}, title = {The tablecloth pull revisited}, series = {Physics Education 50 (2015) 3}, journal = {Physics Education 50 (2015) 3}, pages = {324 -- 328}, year = {2015}, abstract = {Abstract A very old and well-known magical trick is the so-called tablecloth pull. A table is covered with a tablecloth, on top of which are certain objects. The task is to remove the tablecloth while the objects—which must not be touched—stay on top of the table. This article describes the physics behind the experiment, and presents examples recorded with high-speed cameras.}, language = {en} } @misc{Moellmann2013, author = {M{\"o}llmann, Klaus-Peter}, title = {Theorie und Praxis der Strahlungsthermometrie}, year = {2013}, language = {de} } @misc{Vollmer2002, author = {Vollmer, Michael}, title = {There is more to see than eyes can detect}, year = {2002}, language = {en} } @article{KarstaedtMoellmannPinnoetal.2001, author = {Karst{\"a}dt, Detlef and M{\"o}llmann, Klaus-Peter and Pinno, Frank and Vollmer, Michael}, title = {There is more to see than eyes can detect : visualization of energy transfer processes and the laws of radiation for physics education}, series = {In: The Physics Teacher 39 (2001), 371-376}, journal = {In: The Physics Teacher 39 (2001), 371-376}, pages = {371 -- 376}, year = {2001}, language = {en} } @article{KarstaedtMoellmannPinnoetal.2001, author = {Karst{\"a}dt, Detlef and M{\"o}llmann, Klaus-Peter and Pinno, Frank and Vollmer, Michael}, title = {There is more to see than eyes can detect: visualization of energy transfer processes and the laws of radiation for physics education}, series = {In: The Physics Teacher 39 (2001), 371-376}, journal = {In: The Physics Teacher 39 (2001), 371-376}, pages = {371 -- 376}, year = {2001}, language = {en} } @inproceedings{MoellmannVollmer2012, author = {M{\"o}llmann, Klaus-Peter and Vollmer, Michael}, title = {Thermal effects due to focused light from glass fronts}, series = {InfraMation proceedings. - Vol. 13 (2012)}, booktitle = {InfraMation proceedings. - Vol. 13 (2012)}, year = {2012}, language = {de} } @inproceedings{MoellmannKarstaedtPinnoetal.2006, author = {M{\"o}llmann, Klaus-Peter and Karst{\"a}dt, Detlef and Pinno, Frank and Vollmer, Michael}, title = {Thermal image quality - Visualization of spatial and thermal resolution in thermal imaging}, series = {In: InfraMation proceedings Vol. 7 (2006), 79-92}, booktitle = {In: InfraMation proceedings Vol. 7 (2006), 79-92}, pages = {79 -- 92}, year = {2006}, language = {en} } @techreport{KueglerMoellerGoeckeetal.2015, author = {K{\"u}gler, H. and M{\"o}ller, F. and Goecke, Sven-Frithjof and Vollertsen, F.}, title = {Thermisches F{\"u}gen h{\"o}chstfester St{\"a}hle}, series = {Schweissen und Schneiden}, volume = {67}, journal = {Schweissen und Schneiden}, number = {12}, issn = {0036-7184}, pages = {744}, year = {2015}, language = {de} }