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Authors: Bertolini, A.* 
Beverini, N.* 
De Michele, A.* 
Fidecaro, F.* 
Mango, F.* 
Title: A sapphire monolithic differential accelerometer as core sensor for gravity gradiometric geophysical instrumentation
Issue Date: Aug-2006
Series/Report no.: 4-5/49 (2006)
Keywords: gradiometric gravimeter
Whispering gallery cavity
Subject Classification04. Solid Earth::04.02. Exploration geophysics::04.02.02. Gravity methods 
Abstract: Gradiometric gravimetry is a survey technique widely used in geological structure investigation. This work demonstrates the feasibility of a new class of low frequency accelerometers for geodynamics studies and space applications. We present the design features of a new low noise single-axis differential accelerometer; the sensor is suitable to be used in a Gravity Gradiometer (GG) system for land geophysical survey and gravity gradient measurements. A resolution of 1 Eötvös (1 Eö=10−9s−2) at one sample per second is achievable in a compact, lightweight (less than 2 kg) portable instrument, operating at room temperature. The basic components of the sensor are two identical rigidly connected accelerometers separated by a 15-cm baseline vector and the useful signal is extracted as the subtraction of the two outputs, by means of an interferometric microwave readout system. The structure will be engraved in a monocrystal of sapphire by means of Computer-Numerically-Controlled (CNC) ultrasonic machining: the material was chosen because of its unique mix of outstanding mechanical and dielectric properties.
Appears in Collections:Annals of Geophysics

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