Er hat eine etwa 100-fach größere Dynamik als herkömmliche Sensoren.
Signale im Bereich einiger Mikrovolt kann er in einem Rutsch mit Ausschlägen von einigen hundert Millivolt messen.
Bisher waren dazu mehrere Messungen nötig.
www.fraunhofer.deThe new photo-detector multiplies the dynamic range by 100, resulting in a much faster spectrometer.
It is capable of measuring signals in the microvolt range at the same time as signals measuring some 100 millivolts.
Until now, this required several measurement cycles.
www.fraunhofer.deGemessen wurde die Erregung in den Nervenbahnen der Antennen der Krebse durch einzelne Substanzen.
Die dabei erhaltenen „ Elektroantennogramme “ zeichnen winzige Spannungsänderungen an der Zellmembran im Mikrovolt-Bereich auf.
In anschließenden Verhaltensexperimenten stellte die Forscherin fest, dass die Tiere bei höherer Luftfeuchte deutlicher und schneller auf die Geruchssignale reagierten.
www.mpg.deShe measured the excitation in the neurons of the crabs ’ antennae in response to single substances.
The results were so-called “ electroantennograms ” ( EAGs ) which measured tiny voltage changes across the cell membranes in the microvolt range.
A striking feature of the subsequently performed bioassays was that the crabs ’ behavioural responses to odorants were more obvious and much faster at a significantly increased humidity, assumingly due to an enhanced electrical excitability of their antennal neurons.
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