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Mango, F.
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Mango, F.
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- PublicationOpen AccessA sapphire monolithic differential accelerometer as core sensor for gravity gradiometric geophysical instrumentation(2006-08)
; ; ; ; ; ;Bertolini, A.; Dipartimento di Fisica «E. Fermi», Università degli Studi di Pisa, and Istituto Nazionale di Fisica della Materia (INFM), CNR, Pisa, Italy ;Beverini, N.; Dipartimento di Fisica «E. Fermi», Università degli Studi di Pisa, and Istituto Nazionale di Fisica della Materia (INFM), CNR, Pisa, Italy ;De Michele, A.; Dipartimento di Fisica «E. Fermi», Università degli Studi di Pisa, and Istituto Nazionale di Fisica della Materia (INFM), CNR, Pisa, Italy ;Fidecaro, F.; Dipartimento di Fisica «E. Fermi», Università degli Studi di Pisa, and Istituto Nazionale di Fisica della Materia (INFM), CNR, Pisa, Italy ;Mango, F.; Dipartimento di Fisica «E. Fermi», Università degli Studi di Pisa, and Istituto Nazionale di Fisica della Materia (INFM), CNR, Pisa, Italy; ; ; ; 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.220 312