Method and system for sensing a physical quantity using analog optical signal transmission
US5453866A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 3, 1993 |
| Grant date | Sep 26, 1995 |
| Priority date | — |
| Expiry date | Dec 3, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08C23/06
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A measurement system uses optical of the energy for a sensor and analog optical transmission of the measuring signals of the sensor. A feedback control system sets the working point of the optical transmission system for the measuring signals. A zero measuring signal is provided to an electro-optical signal converter, which outputs a corresponding optical analog signal via a optical transmission line to an optoelectric signal converter. The optoelectric signal converter is adjusted to a predefined analysis signal setpoint when the electro-optical signal converter receives the zero measuring signal via a feedback control system. The manipulated variable of the feedback control system is the working-point current of the electro-optical signal converter, which converts the electrical measuring signals into optical signals. This feedback control system can be used to compensate for interference in the analog transmission. An additional feedback control system, which amplifies the analysis signals into output signals, is provided to correct the gain factor of an amplifier unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.