@misc{Vollmer2013, author = {Vollmer, Michael}, title = {Brilliant colors from a white snow cover}, year = {2013}, language = {en} } @misc{Vollmer2013, author = {Vollmer, Michael}, title = {Visible and invisible mirages: comparing inferior mirages in the visible and thermal infrared spectral range}, 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} } @misc{Vollmer2001, author = {Vollmer, Michael}, title = {A random walk through the cultural history of the rainbow}, year = {2001}, language = {en} } @misc{Vollmer2009, author = {Vollmer, Michael}, title = {IR imaging of gases: potential applications for CO2 cameras}, year = {2009}, language = {en} } @misc{Vollmer2009, author = {Vollmer, Michael}, title = {IR feedback loops to spotlights: thermography and contemporary dancing}, year = {2009}, language = {en} } @misc{Vollmer2010, author = {Vollmer, Michael}, title = {High speed - slow motion I: new insights for hands on experiments in mechanics}, year = {2010}, language = {en} } @misc{Vollmer2010, author = {Vollmer, Michael}, title = {High speed - slow motion II : more experiments using gases, fluids, heat and electromagnetism}, year = {2010}, language = {en} } @misc{Vollmer2010, author = {Vollmer, Michael}, title = {Measurements of sky, clouds and moon with IR cameras: effects of air mass}, year = {2010}, language = {en} } @misc{VollmerMoellmann2011, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter}, title = {High speed - slow motion: fascinating phenomena observed in hands-on experiments}, year = {2011}, language = {en} } @misc{Vollmer2011, author = {Vollmer, Michael}, title = {IR imaging of CO2: basics, experiments, and potential industrial applications}, year = {2011}, language = {en} } @misc{Vollmer2011, author = {Vollmer, Michael}, title = {Low cost hands-on experiments for physics teaching}, year = {2011}, language = {en} } @misc{Vollmer2011, author = {Vollmer, Michael}, title = {Optics of glass fronts of buildings: the science of skyscraper death rays}, year = {2011}, language = {en} } @misc{Vollmer2001, author = {Vollmer, Michael}, title = {More laboratory experiments in atmospheric optics}, year = {2001}, language = {en} } @misc{Vollmer2001, author = {Vollmer, Michael}, title = {Visualization of physical phenomena involving energy transfer}, year = {2001}, language = {en} } @misc{Vollmer2002, author = {Vollmer, Michael}, title = {Red sky, green sun, black clouds: light scattering phenomena in the atmosphere!}, year = {2002}, language = {en} } @misc{Vollmer2002, author = {Vollmer, Michael}, title = {Hands on experiments in physics education}, year = {2002}, language = {en} } @misc{Vollmer2002, author = {Vollmer, Michael}, title = {There is more to see than eyes can detect}, year = {2002}, language = {en} } @misc{Vollmer2002, author = {Vollmer, Michael}, title = {Physics teacher training and research in physics education in Europe}, year = {2002}, language = {en} } @misc{Vollmer2003, author = {Vollmer, Michael}, title = {Optical Phenomena of Aerosols}, year = {2003}, language = {en} } @misc{Vollmer2004, author = {Vollmer, Michael}, title = {Effects of absorbing particles on coronas and glories}, year = {2004}, language = {en} } @misc{Vollmer2004, author = {Vollmer, Michael}, title = {Experiments and simulations for teaching coronas, glories and supernumerary rainbows}, year = {2004}, language = {en} } @misc{Vollmer2004, author = {Vollmer, Michael}, title = {Identification and suppression of Thermal Reflections in Infrared Thermal Imaging}, year = {2004}, language = {en} } @misc{Vollmer2005, author = {Vollmer, Michael}, title = {Coronas and glories}, year = {2005}, language = {en} } @misc{Vollmer2005, author = {Vollmer, Michael}, title = {Hands on experiments in physics education}, year = {2005}, language = {en} } @misc{Vollmer2005, author = {Vollmer, Michael}, title = {Locomotion by blowing into the sail of your own sailboat: Muenchhausen story or real physics?}, year = {2005}, language = {en} } @misc{Vollmer2005, author = {Vollmer, Michael}, title = {Thermography of microwave ovens}, year = {2005}, language = {en} } @misc{Vollmer2006, author = {Vollmer, Michael}, title = {Influence of gaseous species on thermal infrared imaging}, year = {2006}, language = {en} } @misc{Vollmer2007, author = {Vollmer, Michael}, title = {Demonstration of Quetelet fringes}, year = {2007}, language = {en} } @misc{Vollmer2007, author = {Vollmer, Michael}, title = {Illuminance during a solar eclipse}, year = {2007}, language = {en} } @misc{Vollmer2007, author = {Vollmer, Michael}, title = {Luminance during a total lunar eclipse}, year = {2007}, language = {en} } @misc{Vollmer2007, author = {Vollmer, Michael}, title = {Looking through matter: quantitative IR imaging when observing through IR windows}, year = {2007}, language = {en} } @misc{Vollmer2008, author = {Vollmer, Michael}, title = {Cheese cubes, light bulbs, soft drinks: An unusual approach to study convection, radiation and size dependent heating and cooling}, year = {2008}, language = {en} } @article{ShawNugentVollmer2015, author = {Shaw, Joseph A. and Nugent, Paul W. and Vollmer, Michael}, title = {Infrared Moon imaging for remote sensing of atmospheric smoke layers}, series = {Applied Optics 54 (2015) 4, B64-B75}, journal = {Applied Optics 54 (2015) 4, B64-B75}, doi = {10.1364/AO.54.000B64}, pages = {B64 -- B75}, year = {2015}, abstract = {Abstract Simultaneous visible and long-wave infrared (IR) images of the Moon were used with a simple energy-balance model to study the spatial pattern of lunar surface temperatures. The thermal images were obtained with a radiometrically calibrated, compact, low-cost, commercial IR camera mounted on a small telescope. Differences between the predicted and measured maximum Moon temperatures were used to determine the infrared optical depth (OD), which represents the path-integrated extinction of an elevated layer of wildfire smoke in the atmosphere. The OD values retrieved from the IR Moon images were combined with simultaneous OD measurements from a ground-based, zenith-pointing lidar operating at a wavelength of 532 nm to determine an IR-to-visible OD ratio of 0.50±0.18 for moderately aged wildfire smoke aerosol. © 2014 Optical Society of America}, language = {en} } @article{VollmerShawNugent2015, author = {Vollmer, Michael and Shaw, Joseph A. and Nugent, Paul W.}, title = {Visible and invisible mirages: comparing inferior mirages in the visible and thermal infrared}, series = {Applied Optics 54 (2015) 4, B76-B84}, journal = {Applied Optics 54 (2015) 4, B76-B84}, doi = {10.1364/AO.54.000B76}, pages = {B76 -- B84}, year = {2015}, abstract = {Abstract Visible (VIS)-light and thermal infrared (IR) inferior mirages in the 8-14 μm waveband have been observed simultaneously for the takeoff and landing of various airplanes at distances of several kilometers. Similarities as well as differences between the VIS and IR mirages are discussed. © 2014 Optical Society of America}, 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{ShawNugentVollmer2015, author = {Shaw, Joseph A. and Nugent, Paul and Vollmer, Michael}, title = {Colors of the Yellowstone thermal pools for teaching optics}, series = {Proceedings of SPIE 9793, Education and Training in Optics and Photonics: ETOP 2015, 97931S (October 8, 2015)}, journal = {Proceedings of SPIE 9793, Education and Training in Optics and Photonics: ETOP 2015, 97931S (October 8, 2015)}, doi = {10.1117/12.2223177}, year = {2015}, abstract = {abstract Nature provides many beautiful optical phenomena that can be used to teach optical principles. Here we describe an interdisciplinary education project based on a simple computer model of the colors observed in the famous thermal pools of Yellowstone National Park in the northwestern United States. The primary wavelength-dependent parameters that determine the widely varying pool colors are the reflectance of the rocks or the microbial mats growing on the rocks beneath the water (the microbial mat color depends on water temperature) and optical absorption and scattering in the water. This paper introduces a teaching module based on a one-dimensional computer model that starts with measured reflectance spectra of the microbial mats and modifies the spectra with depth-dependent absorption and scattering in the water. This module is designed to be incorporated into a graduate course on remote sensing systems, in a section covering the propagation of light through air and water, although it could be adapted to a general university optics course. The module presents the basic 1-D radiative transfer equation relevant to this problem, and allows them to build their own simple model. Students can then simulate the colors that would be observed for different variations of the microbial mat reflectance spectrum, skylight spectrum, and water depth. © (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.}, language = {en} } @article{VollmerMoellmann2015, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter}, title = {Bouncing Poppers}, series = {The Physics Teacher 53 (2015) 8, 489.493}, journal = {The Physics Teacher 53 (2015) 8, 489.493}, doi = {10.1119/1.4933153}, year = {2015}, abstract = {Abstract Toys are known to attract interest in physics and they are therefore often used in physics teaching of various topics. The present paper deals with a simple toy, the so-called "hopper popper," which, similar to superballs, can be used when teaching mechanics. We suggest some experiments and describe the basic physics of this toy, also providing background information for teachers.}, 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} } @article{VollmerMoellmann2015, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter}, title = {Flickering lamps}, series = {European Journal of Physics 36 (2015) 3}, journal = {European Journal of Physics 36 (2015) 3}, doi = {10.1088/0143-0807/36/3/035027}, pages = {035027}, year = {2015}, abstract = {Abstract Many processes in electromagnetism vary with time. Some of them are well known, in particular those related to line frequencies of 50 Hz or 60 Hz such as fluctuating light output of discharge and incandescent lamps. The flickers of discharge and incandescent lamps have quite different physical principles involved, which are investigated experimentally using high-speed cameras and theoretically using simplified models. The topic is related to other phenomena such as the transient behaviour of phosphor layers covering the screen of oscilloscopes and the time-varying Lorentz force acting on the filament of light bulbs. All studies are well suited for teaching selected aspects of electromagnetism and light at undergraduate level at university.}, language = {en} } @article{VollmerMoellmann2015, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter}, title = {Light-emitting pickles}, series = {Physics Education 50 (2015) 1}, journal = {Physics Education 50 (2015) 1}, pages = {94 -- 104}, year = {2015}, abstract = {Abstract We present experiments giving new insights into the classical light-emitting pickle experiment. In particular, measurements of the spectra and temperatures, as well as high-speed recordings, reveal that light emission is connected to the polarity of the electrodes and the presence of hydrogen.}, language = {en} } @article{VollmerMoellmann2015, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter}, title = {Krach-bumm-peng - B{\"o}ller und Tischfeuerwerke}, series = {Physik in unserer Zeit 46 (2015) 6, 305-306}, journal = {Physik in unserer Zeit 46 (2015) 6, 305-306}, doi = {10.1002/piuz.201590105}, pages = {305 -- 306}, year = {2015}, abstract = {Abstract Zu Silvester wird es wieder krachen und knallen, draußen oder drinnen. Hochgeschwindigkeits-Videos von Chinakrachern offenbaren deren dynamische Explosionsphase. Auch die weniger spektakul{\"a}ren Tischfeuerwerke zeigen noch so manches interessante Detail.}, language = {de} } @article{VollmerMoellmann2015, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter}, title = {Flimmernde Luft und funkelnde Sterne}, series = {Physik in unserer Zeit 46 (2015) 5, 254-255}, journal = {Physik in unserer Zeit 46 (2015) 5, 254-255}, doi = {10.1002/piuz.201590087}, pages = {254 -- 255}, year = {2015}, abstract = {Abstract Das Flimmern der Sterne, von manchen als romantisch empfunden, ist f{\"u}r Astronomen ein {\"A}rgernis. Selbst bei klarer Luft scheinen die Sterne herumzuh{\"u}pfen und in st{\"a}ndiger Bewegung zu sein. Das Maß des Seeings, wie die Wissenschaftler sagen, beschr{\"a}nkt das r{\"a}umliche Aufl{\"o}sungsverm{\"o}gen von Teleskopen. Mit einer einfachen Versuchsanordnung und einer Hochgeschwindigkeits-Kamera l{\"a}sst sich dieses Ph{\"a}nomen im Labor nachstellen und analysieren.}, language = {de} } @article{VollmerMoellmann2015, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter}, title = {Der Trick mit der Tischdecke}, series = {Physik in unserer Zeit 46 (2015) 4, 199-201}, journal = {Physik in unserer Zeit 46 (2015) 4, 199-201}, doi = {10.1002/piuz.201590067}, pages = {199 -- 201}, year = {2015}, abstract = {Abstract Eine Tischdecke unter einem Service feinsten Porzellans wegzuziehen ohne dass etwas vom Tisch f{\"a}llt und zerbricht ist sicher eine Herausforderung. Aber viele Vorf{\"u}hrungen, auch in Experimentalphysik-Vorlesungen beweisen: es funktioniert. Hochgeschwindigkeits-Videos k{\"o}nnen diesen heiklen Experimenten physikalische Details entlocken.}, language = {de} } @article{VollmerMoellmann2015, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter}, title = {Springende H{\"u}pfgummis}, series = {Physik in unserer Zeit 46 (2015) 3, 149-150}, journal = {Physik in unserer Zeit 46 (2015) 3, 149-150}, doi = {10.1002/piuz.201590049}, pages = {149 -- 150}, year = {2015}, abstract = {Abstract H{\"u}pfgummis sind einfache, preiswerte Spielzeuge, die in Spielwarenl{\"a}den oder Science Centern erh{\"a}ltlich sind. Sie erm{\"o}glichen interessante Einblicke in physikalische Ph{\"a}nomene der Mechanik - insbesondere mit Hochgeschwindigkeits-Videos.}, language = {de} } @article{VollmerMoellmann2015, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter}, title = {Die Gurke leuchtet komplex}, series = {Physik in unserer Zeit 46 (2015) 2, 78-83}, journal = {Physik in unserer Zeit 46 (2015) 2, 78-83}, doi = {10.1002/piuz.201401388}, pages = {78 -- 83}, year = {2015}, abstract = {Abstract Das Experiment, bei dem eine Essiggurke elektrisch stimuliert leuchtet, geh{\"o}rt zum Standardrepertoire vieler Schulen und Hochschulen. Meist wird es zur Elektrizit{\"a}tslehre oder zur Atomphysik vorgef{\"u}hrt, inklusive vordergr{\"u}ndig einleuchtender Erkl{\"a}rung. Eine genauere Untersuchung zeigt jedoch, dass der Mechanismus komplexer als gedacht ist. Die Lichtemission entsteht in einem Zusammenspiel von Elektrolyse und hohen Elektrodentemperaturen. Dabei regen wahrscheinlich vor allem exotherme Wasserstoff- oder Knallgasreaktionen das Natriumlicht an.}, language = {de} } @article{MangoldShawVollmer2015, author = {Mangold, Klaus and Shaw, Joseph A. and Vollmer, Michael}, title = {Rotwein zu Wasser}, series = {Physik in unserer zeit 46 (2015) 1, 12-16}, journal = {Physik in unserer zeit 46 (2015) 1, 12-16}, doi = {10.1002/piuz.201401375}, pages = {12 -- 16}, year = {2015}, abstract = {Abstract Die Sensoren von Digitalkameras sind f{\"a}hig, Licht im Nahinfraroten (NIR) bis hin zu Wellenl{\"a}ngen von 1100 nm aufzunehmen. Infrarotfilter blockieren diesen f{\"u}r den Menschen nicht sichtbaren Spektralbereich, um irritierende Falschfarbeneffekte in den Aufnahmen zu verhindern. Diese Filter sind aber entfernbar, und derart umger{\"u}stete Kameras erschließen eine verbl{\"u}ffende Welt. Beim {\"U}bergang zum NIR {\"a}ndern sich die optischen Eigenschaften vieler Objekte. In Landschaftsaufnahmen werden Bl{\"a}tter zu den hellsten Objekten. Rotwein, Cola oder Kaffee werden scheinbar zu Wasser. Man kann zudem unter die Oberfl{\"a}che von Farben, Stoffen, Lacken und sogar der Haut schauen.}, language = {de} } @article{VollmerMoellmann2014, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter}, title = {Flackernde Entladungslampen unter der (Zeit-)lupe}, series = {Physik in unserer Zeit 45 (2014) 4, 199-200}, journal = {Physik in unserer Zeit 45 (2014) 4, 199-200}, doi = {10.1002/piuz.201490064}, pages = {199 -- 200}, year = {2014}, abstract = {Abstract Wer kennt es nicht, das Flackern von Lampen, das bei empfindlichen Menschen Kopfschmerzen verursachen kann? So etwas kann bei Entladungsr{\"o}hren mit ung{\"u}nstigen Eigenschaften der phosphorisierenden Beschichtung auftreten. Mit moderner Technik l{\"a}sst sich dieses Problem l{\"o}sen. Hochgeschwindigkeits-Videos zeigen verschiedene Ph{\"a}nomene, die beim Betrieb von Entladungsr{\"o}hren auftreten.}, language = {de} } @article{VollmerMoellmann2016, author = {Vollmer, Michael and M{\"o}llmann, Klaus-Peter}, title = {Stehaufkreisel - a never ending story}, series = {Physik in unserer Zeit}, volume = {47}, journal = {Physik in unserer Zeit}, number = {2}, doi = {10.1002/piuz.201601435}, pages = {96 -- 97}, year = {2016}, abstract = {Abstract Stehaufkreisel sind faszinierende physikalische Spielzeuge, die scheinbar die Schwerkraft auszutricksen verm{\"o}gen: Nach anf{\"a}nglicher Rotation drehen sie sich so um, dass sie schließlich auf der fr{\"u}heren Spitze rotieren. Hochgeschwindigkeits-Videos erm{\"o}glichen es, die komplizierten mathematischen L{\"o}sungen ihrer Bewegung experimentell zu {\"u}berpr{\"u}fen.}, language = {de} } @article{Vollmer2016, author = {Vollmer, Michael}, title = {Cooked to perfection: microwave ovens}, series = {Physics Education}, volume = {51}, journal = {Physics Education}, number = {3}, doi = {10.1088/0031-9120/51/3/030102}, year = {2016}, language = {en} } @misc{MoellmannVollmer2014, author = {M{\"o}llmann, Klaus-Peter and Vollmer, Michael}, title = {Experimente mit IR- Kameras}, year = {2014}, language = {de} }