Laser radiometer
US4417822A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 9, 1981 |
| Grant date | Nov 29, 1983 |
| Priority date | — |
| Expiry date | Nov 9, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J2005/583
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention teaches a unique laser radiometer capable of accurately measuring the radiation temperature of a radiant surface and independently measuring the surface's emissivity. A narrow-band radiometer is combined with a laser reflectometer to measure concurrently radiance and emissivity of a remote, hot surface. Together, radiance and emissivity yield the true surface temperature of the remote target. A narrow receiver bandwidth is attained by one of two methods; (a) heterodyne detection or (b) optical filtering. A direct measurement of emissivity is used to adjust the value obtained for the thermal radiation signal to substantially enhance the accuracy of the temperature measurement for a given subject surface. The technique provides substantially high detection sensitivity over a very narrow spectral bandwidth.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.