Non-linear ranging to control linear ranging measurement device
US6784987B2 · kind B2 · utility
1Cited by
10References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 21, 2002 |
| Grant date | Aug 31, 2004 |
| Priority date | — |
| Expiry date | Apr 11, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J1/18
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A range selection circuit (13), including a logarithmic amplifier (23) and output circuitry (25) associated therewith, is configured to directly drive linear ranging circuitry for measurement circuitry (12) in an optical power meter (10) to measure signals that vary over a wide range of, for example, from about −7 dB to about −45 dB. This allows the optical power meter to change ranges as fast as one (1) times the hardware settling time. The range selection circuitry is in parallel with the measurement circuitry, which allows ranging to happen in real time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.