Scientific Results

Optical fiber three-axis accelerometer based on lasers locked to pi phase-shifted Bragg gratings

Year: 2010

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

Autors Affiliation: Centre for Gravitational Physics, ANU, Canberra (AU); CNR – Istituto Nazionale di Ottica, UOS di Napoli, via Campi Flegrei 34, 80078 Pozzuoli Napoli, Italy; CNR – Istituto Nazionale di Ottica, Largo E. Fermi 6, 50125 Firenze, Italy; AMRA (Analysis and Monitoring of Environmental Risk) Scarl. via Nuova Agnano 11, 80125 Naples, Italy

Abstract: We report on a high-bandwidth, three-axis accelerometer developed with pi phase-shifted fiber Bragg gratings. The gratings are inserted into a cantilever system and interrogated by three separate telecom distributed-feedback diode lasers. The lasers are frequency locked to the sensors using a radio-frequency Pound-Drever-Hall technique. This scheme reduces the effect of laser amplitude noise and allows for real-time measurements with a dynamic range greater than 50 g. An operation bandwidth of about 1000 Hz is demonstrated with minimum detectable accelerations in the order of 10 mu g(rms) Hz (1/2) for frequencies above 10 Hz, only limited by the interrogating lasers frequency noise.


Volume: 21 (9)      Pages from: 094010  to: 094010

More Information: This work was done at INO with funding and support from Consiglio Nazionale delle Ricerche (CNR) by the RSTL-project. TT-YL would like to acknowledge the visiting scholarship provided by INO to make this research possible. The authors thank Stefano Carlino (Osservatorio Vesuviano-INGV, Naples) for helpful and stimulating discussions.
KeyWords: Accelerometers; Bandwidth; Bragg gratings; Distributed feedback lasers; Fiber Bragg gratings; Fibers; Locks (fasteners); Nanocantilevers; Optical fibers; Semiconductor lasers, Cantilever; Distributed feedback diode laser; Frequency locking; Phase shifted fiber bragg grating (PSFBG); Phase-shifted gratings; Pound-Drever-Hall technique; Real time measurements; Three axis accelerometers, Phase shift
DOI: 10.1088/0957-0233/21/9/094010

Citations: 22
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