US 4,290,146 AGranted

Measuring device for transmitting measuring signals via an optical link

AssigneeASEA Aktiebolag

InventorsMorgan Adolfsson, Torgny Brogardh

Life of this patent

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Abstract

A measuring device has a transmitter side that is connected to a receiver side over an optical transmission link. The transmitter side receives an input measurement signal from a transducer and applies the input signal to an adder that also receives a feedback signal from the receiver side. The adder generates a comparison signal that corresponds to the difference between the input signal and the feedback signal. The comparison signal is applied to a regulator on the receiver side. The regulator generates the feedback signal and an output signal having a magnitude corresponding to the magnitude of the input signal. Amplification of the feedback signal on the receiver side is controlled by time division or frequency division calibration signals, so that the total amplification of the feedback signal between the adder and the regulator is held constant.

Claims11

Dependent claims

In a measuring device of a type having a transmitter side and a receiver side, the transmitter side receiving at least one input measurement signal and transmitting the at least one input measurement signal over an optical link to the receiver side, the improvement comprising:

comparing means on said transmitter side for receiving the at least one measurement signal and a feedback signal from said receiver side and generating a corresponding comparison signal having an amplitude that is a function of the magnitude of the measurement signal and the received feedback signal;
first optical transmission link means for transmitting said comparison signal from the transmitter side to the receiver side;
regulator means with integrating characteristic on said receiver side for receiving the transmitted comparison signal and for generating a feedback signal having a magnitude corresponding to the magnitude of the measurement signal;
and
second optical transmission link means for transmitting the feedback signal from the receiver side to the transmitter side in the form of a light signal, the light intensity of which is a direct measure of said feedback signal.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 06/075,873Filed 17 Sep 1979
Priority: SE 780996122 Sep 1978
Granted: 15 Sep 1981
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

G01R 15/22
Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks: using light-emitting devices, e.g. LED,…
G08C 23/06
Non-electrical signal transmission systems, e.g. optical systems: through light guides, e.g. optical fibres
H03G 3/3084
In amplifiers having semiconductor devices: in receivers or transmitters for electromagnetic waves other than radiowaves, e.g. lightwaves
H04B 10/5057
Using external modulation: using a feedback signal generated by analysing the optical output