Optical measuring device having d.c. component elimination
US6922577B2 · kind B2 · utility
16Cited by
9References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 10, 2003 |
| Grant date | Jul 26, 2005 |
| Priority date | — |
| Expiry date | May 4, 2023 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/0059
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An optical measuring device includes a sensor which emits light flashes toward a subject of detection with a light emitting element which is supplied with electric power from a rechargeable battery for a certain duration at certain intervals and receives reflected light from the subject with a light sensitive element. A subtractor subtracts a d.c. component from a sensed signal provided by the light sensitive element, thereby extracting a variation component. The subtractor has its output signal amplified with an amplifier, with the output thereof being A/D-converted with an A/D converter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.