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Ein Bewegungsmelder (auch: “BWM”) ist ein elektronischer Sensor, der Bewegungen in seiner näheren Umgebung erkennt und dadurch als elektrischer Schalter arbeiten kann.
Ein Bewegungsmelder kann aktiv mit: elektromagnetischen Wellen (HF, Mikrowellen oder Dopplerradar), mit Ultraschall (Ultraschall-Bewegungsmelder) oder, wie der PIR-Sensor, passiv anhand der Infrarotstrahlung
der bewegten Person und der Umgebung arbeiten. Er reagiert auf kleine Änderungen der Temperatur,
beispielsweise wenn eine Person am Sensor vorbeigeht. Bewegungsmelder mittels Mikrowellen reagieren optimal, wenn
sich der Abstand zum Sensor ändert. Ultraschall-Sensorik wird aufgrund der verhältnismäßig
aufwendigen Technik seltener eingesetzt. Gemäß Anwendungsgebiet werden verschiedene Sensortypen oder Kombinationen aus mehreren Sensoren eingesetzt.
Der pyroelektrische Sensor (PIR-Sensor, Pyroelectric Infrared Sensor) ist der am häufigsten eingesetzte
Typ von Bewegungsmeldern. Ein auf Infrarot basierender Bewegungsmelder auf Basis eines PIR-Sensors zur Bewegungserkennung hat in der Regel auch einen zusätzlich eingebauten Dämmerungsschalter, der dafür sorgt,
dass die Beleuchtung nur bei Dunkelheit vom eigentlichen Bewegungsmelder
eingeschaltet wird. Bewegt sich eine Wärmequelle vorm Melder, so schaltet er die Beleuchtung für
eine einstellbare Zeitspanne ein und nach Ablauf der eingestellten Leuchtzeit
wieder aus.
Endlich wieder gehen können – oder zumindest selbst
bewegen: Ein Traum von Hirnforschern ist es geraume Zeit, direkte Schnittstellen zum Gehirn möglich, mit denen es behinderten Menschen wieder
möglich werden könnten, Gliedmaßen zu bewegen, deren Nerven eigentlich durchtrennt sind und keine direkte Verbindung zu den grauen Zellen mehr haben. Am Berufsgenossenschaftlichen Universitätsklinikum
Bergmannsheil in Bochum hat nun ein Forschungsprojekt demonstriert, dass eine Hirn-Computer-Schnittstelle, auch Brain-Computer-Interface (BCI) genannt, zumindest einen Rollstuhl
kontrollieren kann. Dabei wurden elektrische Impulse des
Gehirns über eine EEG-Haube gemessen, es mussten also keine
direkt ins Gehirn gepflanzten Elektroden her, wie dies bei bisherigen Projekten üblich war.
Beim Projekt, beim Neurochirurgen und Informatiker kooperierten, lernten zehn Probanden in einer mehrwöchigen Trainingsphase, ihr Fortbewegungsmittel direkt mit Gedankenkraft zu steuern. Dank Algorithmen aus
dem Bereich des maschinellen Lernens wurde anschließend ermittelt, welche Gedanken welche EEG-Aktivitäten auslösen.
Damit konnten Steuersignale für den Rollstuhl
– etwa “fahr nach links” oder “fahr nach vorne” – direkt bestimmten Gedanken zugeordnet werden.
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