A spatial light modulator using BSO crystals

The combined use of the photoelectric and electro-optic properties of the Bi12SiO20 (BSO)-crystal leads to a new possibility of realizing a spatial light modulator. Under certain geometrical conditions, which will be discussed, it is possible to realize, that the BSO-crystal becomes birefringent depending on the local illuminance; the physical connection between the distributions of birefringence and illuminance will be shown. The BSO-crystal combined with a polarizer setup works as a spatial light modulator or as an incoherent to coherent converter

New light valve based in photoinduced space charge fields in BSO-crystals

The combined photoelectric and electrooptic properties of the BSO-crystal lead to a new possibility of realizing a real time spatial light modulator. Under certain geometrical conditions the crystal becomes birefringent in dependence on the local illuminance. Together with a suitable polarizer setup the crystal works as well as an incoherent to coherent converter as for contrast inversion

Grundlagenuntersuchung, Entwicklung und Erprobung optischer Sensoren für die Qualitätssicherung und zum Einsatz an Montagerobotern in der flexiblen Montage : Teilprojekt A4

Die dreidimensionale berührungslose Objektvermessung ist eine zentrale Sensoraufgabe in der industriellen Montage und Qualitätssicherung. Hierfür geeignet sind optische Triangulationsverfahren, die sich im Vergleich zu anderen Verfahren durch hohe relative Distanz- und Lateralauflösung sowie geringen apparativen Aufwand auszeichnen

Progress in understanding of weather systems in West Africa

International audienceThe major advances achieved during African monsoon multidisciplinary analysis in our physical understanding of the West African monsoon (WAM) system are reviewed. Recent research provides an advanced understanding of key WAM features. The Saharan heat low, the interactions of the monsoon flow with the surface and the reversed flow on top of it, all play a more important role than previously assumed, and interact according to the phase of the diurnal cycle of convection. Recent studies also emphasise the significance of upstream conditions in Central and East Africa, as well as strong interactions between midlatitudes and the WAM