3-Axis accelerometer based on lasers locked to π-shifted fibre Bragg gratings

Year: 2009

Authors: Gagliardi G., Salza M., Lam T.T., Chow J.H., De Natale P.,

Autors Affiliation: Consiglio Nazionale Delle Ricerche-Istituto Nazionale di Ottica Applicata (INOA), Compl. A. Olivetti, via Campi Flegrei, 34, Pozzuoli (Naples), 80078, Italy; Centre for Gravitational Physics, Research School of Physics and Engineering, Australian National University, Canberra, ACT 0200, Australia

Abstract: We report on the development of a high-bandwidth, 3-axis accelerometer using π-shifted fibre Bragg gratings. The gratings are inserted into a cantilever system and interrogated by three separate telecom-grade distributed-feedback diode lasers. These lasers are frequency locked to the sensors using a radio-frequency Pound-Drever-Hall technique. This scheme reduced the effect of laser’s amplitude noise and allowed for an acceleration dynamic range of at least 20 g. An operation bandwidth of 500 Hz is demonstrated so far with sensitivities between 20 and 50 μg/√Hz. © 2009 SPIE.


Volume: 7503      Pages from: 75033X  to: 75033X

More Information: ISSN: 0277786X
ISBN: 978-081947814-6
DOI: 10.1117/12.835163
KeyWords: 3-axis accelerometer; Amplitude noise; Cantilever; Cantilever systems; Diode laser, frequency locking