Dual wavelength detector
US7329895B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 22, 2002 |
| Grant date | Feb 12, 2008 |
| Priority date | — |
| Expiry date | Dec 25, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10F77/1248
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A sensor comprises two photodiodes sensitive to different wavelengths. The photodiodes or detectors are stacked in a vertical relationship to each other. A bandpass filter is provided to limit the wavelengths of light reaching the detectors. The photodiodes are formed of various combinations of materials such as AlGaN or InGaN, or different compositions of the same material. Charge detectors are coupled to each detector to provide a signal representative of the amount of radiation detected in their corresponding bandwidths. A biological sample is provided proximate the filter. A laser is used to illuminate the biological sample to create biofluorescence corresponding to intrinsic tryptophan of bacteria.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.