Spectrophotometer and method
US8279441B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 3, 2008 |
| Grant date | Oct 2, 2012 |
| Priority date | — |
| Expiry date | Aug 8, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J2003/104
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A spectrophotometer includes a plurality of LEDs arranged in a circular array, each having a calibrated power input determined by the use of pulse width modulation and each having a unique wavelength band determined by the utilization of a unique fluorescent phosphor coating or lens. At least one of the LEDs comprising a phosphor-free high energy UV LED. Light reflected to the spectrophotometer is divided into predetermined wavelength ranges through the utilization of a linear variable filter and photo detectors wherein the analog signal from a photo detector is converted to a digital value through the use of auto-ranging gain technique.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.