A multi-orientation low-frequency rotational accelerometer

J. J. McCann, J. Winterflood, L. Ju, C. Zhao

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


We present a low frequency rotational accelerometer coined ALFRA with a few nrad/Hz readout sensitivity above 20 mHz and 0.1 nrad/Hz above 50 mHz. The ALFRA is a beam-balance style rotation sensor, which pivots about a cross flexure designed to allow mounting with any orientation, the axis of the pivot determining which rotational component is measured. The high sensitivity is achieved through the use of a walk-off sensor readout used in a feedback loop with an electromagnetic coil to keep the beam dynamically locked. The ALFRA is relatively compact for a ground rotation sensor, measuring at 780 × 240 × 55 mm3.

Original languageEnglish
Article number064503
JournalReview of Scientific Instruments
Issue number6
Publication statusPublished - 1 Jun 2021


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