Method and system for fast determination of the wavelength of a light beam
US10281329B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 14, 2017 |
| Grant date | May 7, 2019 |
| Priority date | — |
| Expiry date | Jun 14, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J9/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Apparatus and associated methods relate to determining the wavelength of a narrow-band light beam. Two portions of the narrow-band light beam are projected onto two dissimilar photodetectors, respectively. The two dissimilar photodetectors have dissimilar spectral responses over a domain of wavelengths that includes the wavelength of the narrow-band light beam. Each of the two dissimilar photodetectors generates an output signal indicative of a photocurrent induced by the projection of the portion of the narrow-band light beam thereon. A ratio of the differences between the photocurrents to the sum of the photocurrents of the two dissimilar photodetectors is determined. The determined ratio is a monotonic function of wavelength over the domain wavelengths including the wavelength of the narrow-band light beam. The determined ratio is thereby indicative of the wavelength of the narrow-band light beam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.