Polymer based distributive waveguide sensor for pressure and shear measurement
US7295724B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 28, 2005 |
| Grant date | Nov 13, 2007 |
| Priority date | — |
| Expiry date | Mar 21, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2006/12176
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
According to embodiments of the present invention, a distributed pressure and shear stress sensor includes a flexible substrate, such as PDMS, with a waveguide formed thereon. Along the waveguide path are several Bragg gratings. Each Bragg grating has a characteristic Bragg wavelength that shifts in response to an applied load due to elongation/compression of the grating. The wavelength shifts are monitored using a single input and a single output for the waveguide to determine the amount of applied pressure on the gratings. To measure shear stress, two flexible substrates with the waveguide and Bragg gratings are placed on top of each other such that the waveguides and gratings are perpendicular to each other. To fabricate the distributive pressure and shear sensor, a unique micro-molding technique is used wherein gratings are stamped into PDMS, for example.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.