Method and system for sensing a physical quantity using analog o

Details Method and system for sensing a physical quantity using analog o Method and system for sensing a physical quantity using analog o

1993-12-03

1995-09-26

Boudreau, Leo H.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359161, 359168, 250551, H04B 1000

Patent

active

054538661

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.

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