Data transmission system

Details Data transmission system Data transmission system

1991-12-11

1994-07-26

Pascal, Leslie

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359124, 359158, 359167, H04J 1402, H04B 1012

Patent

active

053330889

ABSTRACT:
The system enables data from analogue state sensors S1 to S16, four of which may be direct frequency sensors, located in a ZONE 0 (1) environment, to be transmitted by a master transmitter 10 via a fibre optic data link 16 to a master receiver 14. The master receiver is located in a safe environment. The master transmitter comprises a power restrictor unit 18 which has for each data channel a power supply and also a power supply for the printed circuit-board (pcb) of the master transmitter. The master transmitter is located in a ZONE 1 environment. The analogue or state data are voltages which are converted by voltage-to-frequency converters mounted on the pcb and passed to the multiplexer of the master transmitter. The multiplexer feeds the fibre optic link and a demultiplexer at the master receiver reproduces the frequencies. The master receiver re-converts the frequencies to voltage signals.

REFERENCES:
patent: 4142137 (1979-02-01), Umpleby
patent: 4293823 (1981-10-01), Hochberg
patent: 4420840 (1983-12-01), Livermore
patent: 4434510 (1984-02-01), Lemelson
patent: 4707823 (1987-11-01), Holdren et al.
patent: 4710977 (1987-12-01), Lemelson
patent: 4722081 (1988-01-01), Fujito

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