Influence of birefringence dispersion on a distributed stress sensor using birefringent optical fiber

Abstract

Copies of full items can be used for personal research or study, educational, or not-for-profit purposes without prior permission or charge. Provided that the authors, title and full bibliographic details are credited, a hyperlink and/or URL is given for the original metadata page and the content is not changed in any way. A note on versions:The version presented here may differ from the published version or, version of record, if you wish to cite this item you are advised to consult the publisher's version. Please see the 'permanent WRAP URL' above for details on accessing the published version and note that access may require a subscription. ABSTRACTDistributed stress sensor with a scanning Michelson white light interferometer can be used to detect stress distribution and its value by analyzing polarization mode coupling caused by stress field in PMFs (polarization maintaining fibers).In the measurement of polarization coupling, the birefringence in sensing fiber is usually considered to be wavelength-independent. The spatial resolution of the distributed stress sensor is invariable, when the optical source spectrum is given. In practical measurement, however, the birefringence in PMF is related with optical wavelength, the birefringence dispersion exists in PMF. Due to the birefringence dispersion, the spatial resolution of the distributed stress sensor descends obviously with the fiber length increasing. In this paper, the influence of external force position and optical source spectrum on spatial resolution in the distributed stress sensor is analyzed, while the birefringence dispersion is considered.

Directional Force Measurement Using Specialized Single-Mode Polarization-Maintaining Fibers

“…For both types of fibers, a maximum sensitivity can be achieved when the force is applied at 90 in relation to the fiber slow axis. The experiments have also confirmed that the sensitivity of these specialized pressure sensors is independent of the fiber length and of the axial location of the force along the fiber length compared to the other sensors [11]. This makes the sensors more suitable for distributed force measurement.…”

“…This paper has been focused on the discussions of the phase-based pressure sensor technique. There have been some other reports showing intensity-based technique, such as [11], which reported that the lateral pressure sensitivity of PM fibers is dependent on the magnitude and angle of external transverse forces theoretically and supported by one directional measurement data. Regarding the cross sensitivity to the other parameters, such as temperature, [12] has shown that such a sensor is not dependent on temperature variation and this conclusion was further confirmed by Wierza et al [13] after the transverse force was applied, respectively, in the direction of fast and slow axis of a two-hole fiber.…”

Investigation of single mode polarization-maintaining fibres for directional transverse force measurement

“…It has been reported that the lateral pressure sensitivity of PM fibres is dependent on magnitude and angle of external transverse forces with reference to fast or slow axis of the fibre [9], which was further confirmed by Wierza et al after the transverse force was applied respectively in the direction of fast and slow axis of a two-hole fibre [10]. This work, however, is aimed to undertake a more thorough investigation to evaluate the lateral pressure sensitivity of both sidehole(s) fibres, shown in Figure 1, as a function of the angle and magnitude of the external transverse force applied and thus to cross-compare the results obtained from these two different structured side-hole fibres.…”

Polarisation mode dispersion in transverse strain sensor based on optical fibre Solc filter

“…A novel transverse strain sensor based on the Solc filter is reported in [4] which also uses birefringent fibres. It has been reported that the polarisation mode dispersion (PMD) influences the performance of sensors using Hi-Bi fibres [5,6]. This Letter aims to reveal the impact of PMD on the sensitivity of the transverse strain sensor based on the Solc filter.…”