Spectrophotometer with light source in the form of a light emitting diode array
US5477322A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 13, 1994 |
| Grant date | Dec 19, 1995 |
| Priority date | — |
| Expiry date | Oct 13, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J3/2846
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a spectrophotometer, a light source is provided in the form of a multiplicity of light emitting diodes which transmit light through an entrance slit to irradiate an oscillating grating. The light is dispersed by the grating toward an exit slit which transmits a narrow bandwidth of light to irradiate a sample. As the grating oscillates, the wavelength transmitted through the exit slit is scanned through a selected spectrum. The diodes in the array each emit light in a different wavelength band so that the diodes as a group emit light throughout the selected spectrum. As the grating oscillates, the diodes are energized and extinguished in sequence so that no more than two diodes will be energized at any given instant of time and the energized diode will be emitting light at the wavelength dispersed by the grating to the exit slit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.