Measurement of brightness, flow velocity and temperature of radiant media
US6462826B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 6, 2000 |
| Grant date | Oct 8, 2002 |
| Priority date | — |
| Expiry date | Mar 6, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J2005/583
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus for measurement of at least one of brightness, flow velocity and temperature of radiant media are provided. A substantially collimated beam of light having a selected frequency is directed to a linear polariser. The linearly polarised output is directed to an electro-optically active birefringent crystal to separate the output into two characteristic waves and to introduce a first fixed phase delay between the characteristic waves. The birefringent crystal is selectively electro-optically modulated to introduce a second variable phase delay between the characteristic waves and the characteristic waves are combined to interfere prior to detection.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.