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Sidelobe apodization in optical pulse compression reflectometry for fiber optic distributed acoustic sensing
We demonstrate a technique to reduce the sidelobes in optical pulse compression reflectometry for distributed acoustic sensing. The technique is based on using a Gaussian probe pulse with linear frequency modulation. This is shown to improve the sidelobe suppression by 13 dB compared to the use of square pulses without any significant penalty in terms of spatial resolution. In addition, a 2.25 dB enhancement in signal-to-noise ratio is calculated compared to the use of receiver-side windowing. The method is tested by measuring 700 Hz vibrations with a 140 nϵ amplitude at the end of a 50 km fiber sensing link with 34 cm spatial resolution, giving a record 147,058 spatially resolved points. ; European Commission ; Ministerio de Economía y Competitividad ; Comunidad de Madrid
Sidelobe apodization in optical pulse compression reflectometry for fiber optic distributed acoustic sensing
We demonstrate a technique to reduce the sidelobes in optical pulse compression reflectometry for distributed acoustic sensing. The technique is based on using a Gaussian probe pulse with linear frequency modulation. This is shown to improve the sidelobe suppression by 13 dB compared to the use of square pulses without any significant penalty in terms of spatial resolution. In addition, a 2.25 dB enhancement in signal-to-noise ratio is calculated compared to the use of receiver-side windowing. The method is tested by measuring 700 Hz vibrations with a 140 nϵ amplitude at the end of a 50 km fiber sensing link with 34 cm spatial resolution, giving a record 147,058 spatially resolved points. ; European Commission ; Ministerio de Economía y Competitividad ; Comunidad de Madrid
Sidelobe apodization in optical pulse compression reflectometry for fiber optic distributed acoustic sensing
Mompó, J.J. (author) / Martín López, Sonia (author) / González Herráez, Miguel (author) / Loayssa, A. (author) / Ingeniería Fotónica / Universidad de Alcalá. Departamento de Electrónica
2018-04-01
doi:10.1364/OL.43.001499
Article (Journal)
Electronic Resource
English
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