G - Physics
08
C
325/1
G08C 23/06 (2006.01) G01D 4/00 (2006.01) G01D 5/39 (2006.01) G01F 15/06 (2006.01)
Patent
CA 1261394
ABSTRACT OF THE DISCLOSURE REMOTE METERING A system for the remote reading of a gas meter includes an interface unit within a domestic residence but situated such that an input/output terminal for the interface unit is accessable from the exterior of the residence, and a hand-held meter reading unit for connection to the terminal in order to read and record the value of the gas consumption indicated by the meter. The meter reading unit has two LED sources, whose outputs are combined at Y-coupler, for passage into the interface unit when an optical fibre is connected thereto. At a multiplexer, the combined beam is dispersed according to wavelength and separately passes along a fibre array to respective roller digits of the tumbler for reflection or not according to the displayed reading. Reflected light passes back through the system, is divided at a Y-coupler and passes to a de-multiplexer such that the light returning in respect of the roller digits can be measured and displayed at a light detector and liquid crystal display.
540137
Ridout & Maybee Llp
Thorn Emi Plc
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