Accelerometers

Details Accelerometers Accelerometers

G - Physics

01

P

73/42

G01P 15/00 (2006.01) G01P 1/00 (2006.01) G01P 15/093 (2006.01)

Patent

CA 2025805

-11- ABSTRACT OF THE INVENTION An accelerometer includes a compliant cylinder supported midway along its length and has equal masses at opposite ends. Two birefringent optical fibres with elliptical cores are wound around the cylinder in opposite senses on opposite sides of the support. Radiation from a source is supplied to one end of both fibres and emerges from the opposite end where it is supplied to respective photodiodes via respective polarizers. Acceleration axially of the cylinder causes extensive strain in one fibre and compressive strain in the other which causes equal and opposite changes in birefringence. A processor subtracts the change in outputs of the photodiodes to provide an acceleration output that is independent of temperature. .

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