Optical apparatus and method for high speed measurement of temporally-resolved transient pressures
US6660994B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 26, 2001 |
| Grant date | Dec 9, 2003 |
| Priority date | — |
| Expiry date | Apr 23, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L11/02
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for measuring pressure in a medium includes a laser for emitting linearly polarized light; a polarizing beam splitter that reflects the linearly polarized light from the laser; a first lens that receives and focuses the linearly polarized light from the polarizing beam splitter; an optical fiber having first and second ends, the first end for receiving the linearly polarized light from the first lens, the second end comprising a tip disposed in the medium, the tip receiving reflected light from the medium, the reflected light being transmitted back through the optical fiber and the first lens to the polarizing beam splitter; the polarizing beam splitter transmitting the reflected light that has polarization orthogonal to the linearly polarized light emitted by the laser but not transmitting the reflected light that has polarization substantially parallel to the linearly polarized light emitted by the laser; a second lens for receiving the reflected light that has polarization orthogonal to the linearly polarized light emitted by the laser; a photodiode for receiving the orthogonal reflected light from the second lens; an oscilloscope connected to the photodiode; and a …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.