Dual-modulation fiber mboxFabry-Perot interferometer with double reflection for slowly-varying displacements

by Han Cheng Seat, Patrick Chawah, Michel Cattoen, Anthony Sourice, Guy Plantier, Frédérick Boudin, Jean Chéry, Christophe Brunet, Pascal Bernard, M. Suleiman
Abstract:
This Letter describes a dual-amplitude modulation technique incorporated into a double reflection extrinsic-type fiber Fabry-Perot interferometer to measure periodic, nonperiodic as well as quasi-static displacements. The modulation scheme simultaneously maintains the interference signal pair in quadrature and provides a reference signal for displacements inferior to a quarter of the source wavelength. The control and phase demodulation of the interferometer carried out via software enable quasi-real-time measurement and facilitates sensor alignment. The sensor system can be exploited in the low frequency range from 10e-3Hz to 500Hz and has a resolution better than 2.2 nm, targeting applications in geophysics.
Reference:
Han Cheng Seat, Patrick Chawah, Michel Cattoen, Anthony Sourice, Guy Plantier, Frédérick Boudin, Jean Chéry, Christophe Brunet, Pascal Bernard, M. Suleiman, « Dual-modulation fiber mboxFabry-Perot interferometer with double reflection for slowly-varying displacements », In Optics Letters, vol. 37, no. 14, pp. 2886 – 2888, 2012.
Bibtex Entry:
@ARTICLE{OpticsLettersSeat2012,
  author = {Seat, Han Cheng and Patrick Chawah and Michel Cattoen and Anthony
	Sourice and Guy Plantier and Fr'ed'erick Boudin and Jean Ch'ery and
	Christophe Brunet and Pascal Bernard and M. Suleiman},
  title = {Dual-modulation fiber mbox{Fabry-Perot} interferometer with double
	reflection for slowly-varying displacements},
  journal = {Optics Letters},
  year = {2012},
  volume = {37},
  pages = {2886 -- 2888},
  number = {14},
  month = jul,
  abstract = {This Letter describes a dual-amplitude modulation technique incorporated
	into a double reflection extrinsic-type fiber Fabry-Perot interferometer
	to measure periodic, nonperiodic as well as quasi-static displacements.
	The modulation scheme simultaneously maintains the interference signal
	pair in quadrature and provides a reference signal for displacements
	inferior to a quarter of the source wavelength. The control and phase
	demodulation of the interferometer carried out via software enable
	quasi-real-time measurement and facilitates sensor alignment. The
	sensor system can be exploited in the low frequency range from 10e-3Hz
	to 500Hz and has a resolution better than 2.2 nm, targeting applications
	in geophysics.},
  owner = {gplantier},
  timestamp = {2012.11.11}
}