Hannover 2013 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 35: Poster I
Q 35.81: Poster
Dienstag, 19. März 2013, 16:00–18:30, Empore Lichthof
The mobile atom interferometer GAIN: towards low noise absolute gravity measurements — •Christian Freier, Matthias Hauth, Vladimir Schkolnik, Alexander Senger, Malte Schmidt, and Achim Peters — Humboldt-Universität zu Berlin, Institut für Physik, AG Optische Metrologie, Newtonstr. 15, 12489 Berlin
GAIN (Gravimetric Atom Interferometer) is a mobile atom gravimeter, based on interfering ensembles of laser cooled 87Rb atoms in an atomic fountain configuration. It is specifically designed to show the potential of atom interferometry for mobile gravity measurements in the context of geodesy and geophysics.
In order to compete or surpass current state-of-the-art absolute gravimeters, measurement noise caused by environmental vibrations has to be carefully removed. Furthermore, various systematic effects have to be taken into account to come to a reliable absolute value for g.
This contribution will focus on an active vibration isolation which increased the sensitivity of the atom gravimeter to about 2×10−8 g/√Hz, and the implementation of a tip/tilt mirror system to eliminate Coriolis effect offsets and actively stabilize the measurement axis of the instrument within a few µ rad.