We present 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. 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 the difference 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 sapphire was chosen because of its outstanding mechanical and dielectric properties. Key words: accelerometer, gradiometry, dielectric shielded resonator.

A sapphire differential accelerometer as sensor for a gravity gradiometer

BERTOLINI, ALESSANDRO;BEVERINI, NICOLO';DE MICHELE, ANDREA;FIDECARO, FRANCESCO;MANGO, FRANCESCO
2005

Abstract

We present 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. 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 the difference 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 sapphire was chosen because of its outstanding mechanical and dielectric properties. Key words: accelerometer, gradiometry, dielectric shielded resonator.
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/97227
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
social impact