Gravimeters are devices which measure changes in the value of the gravitational acceleration, g. This information is used to infer changes in density under the ground allowing the detection of subsurface voids; mineral, oil and gas reserves; and even the detection of the precursors of volcanic eruptions. A micro-electro mechanical system (MEMS) gravimeter has been fabricated completely in silicon allowing the possibility of cost eeffective, lightweight and small gravimeters. To obtain a measurement of gravity, a highly stable displacement measurement of the MEMS is required. This requires the development of a portable electronics system that has a displacement sensitivity of ≤ 2.5 nm over a period of a day or more. The portable electronics system presented here has a displacement sensitivity ≤ 10 nm/ √ Hz (≤ 0.6 nm at 1000 s). The battery power system used a modulated LED for measurements and required temperature control of the system to ± 2 mK, monitoring of the tilt to ± 2 µradians, the storage of measured data and the transmission of the data to an external server.
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