Methods and sensor for measuring strain
US11965732B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 17, 2021 |
| Grant date | Apr 23, 2024 |
| Priority date | — |
| Expiry date | Jul 26, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2006/12138
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method of measuring strain includes providing laminated material having ply layers, and a thickness along a direction orthogonal to the ply layers, and a strain sensor embedded between adjacent ply layers, wherein: the strain sensor includes first and second planar optical waveguide, each of the waveguides having a waveguiding core defining an optical propagation direction parallel to the laminated material and a Bragg grating in the waveguiding core, the optical propagation directions of the optical waveguides being non-parallel; interrogating the first optical waveguide Bragg grating with transverse electric (TE) and transverse magnetic (TM) polarized light, to obtain a TE spectral response and a TM spectral response; interrogating the second optical waveguide Bragg grating with TE and TM polarized light to obtain a TE spectral response and a TM spectral response; and processing the TE spectral responses and the TM spectral responses to extract a through-thickness component of strain.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.