Apparatus and method for measuring residual stress and photoelastic effect of optical fiber
US6813959B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 8, 2003 |
| Grant date | Nov 9, 2004 |
| Priority date | — |
| Expiry date | May 8, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L5/0047
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Disclosed is an apparatus for measuring a residual stress and a photoelastic effect of an optical fiber, which includes: a light source; a rotary type optical diffuser distanced from the light source in a predetermined distance for suppressing the spatial coherence of a light radiated in the light source; an optical condenser for condensing the radiated light passed through the optical diffuser into a spot where the optical fiber is located; a polarizer for polarizing the light passed through the optical condenser into a 45° linear polarized light from an axis of the optical fiber; a polarization analyzer, installed at 90° angle with respect to the polariscope and attached closely with the optical fiber, to prevent the penetration by the background image of the optical fiber; an optical fiber strain unit including a strain sensor for straining the optical fiber on the polarization analyzer toward a longitudinal direction and measuring the strain on the optical fiber; an object lens for magnifying the image of the light penetrated through the optical fiber; and a charge coupled device(CCD) array for measuring the penetration variation of the optical fiber caused from the str…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.