Space Acceleration Measurement System-II: microgravity instrumentation for the International Space Station research community

Sutliff, Thomas J.

doi:10.1109/imtc.1999.776756

Cited by 6 publications

(1 citation statement)

References 3 publications

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“…Accelerometers are in wide demand in many applications such as consumer electronics [1,2], automotive electronics [3,4], bio-applications [5,6], navigation and guidance systems [7,8], seismometry for oil exploration [9] and earthquake prediction [10,11], microgravity measurements [12][13][14][15], and platform stabilization in space [16]. The linearity in the response of the accelerometer between the input acceleration signal and the output electronic signal, usually a voltage output, is a performance parameter of much importance.…”

Section: Introductionmentioning

confidence: 99%

Linearity analysis of closed-loop capacitive accelerometer due to distance mismatch between plates and the influence of compensation capacitor array

Jingqing¹,

Zhao²,

Zhang³

et al. 2013

Sci. China Inf. Sci.

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This paper presents mathematical formulae showing that the distance mismatch for an uncentered proof mass in an accelerator sensor does not influence the linearity of the closed-loop accelerometer as a whole. This asymmetry in sensors only introduces an output voltage offset in the readout integrated circuit. Numerical simulation using Matlab/Simulink confirms the mathematical conclusion. The linear response after compensation with a conventional capacitor array is also simulated and analyzed. Results show that there is a loss in linearity. Similar results hold not only for the continuous-time architecture, but also for a time-divided architecture. A readout integrated circuit with a time-divided architecture is designed and fabricated using a 0.35 µm HV CMOS process. An accelerometer composed of a microelectromechanical system sensor with severe built-in distance mismatch and the designed readout integrated circuit is tested. Test results show that the nonlinearity of such accelerometer is within 0.3%.

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