G - Physics – 01 – D
Patent
G - Physics
01
D
340/161, 354/21
G01D 5/26 (2006.01) G01D 5/248 (2006.01) G01L 9/12 (2006.01) G01R 19/252 (2006.01) G01R 19/255 (2006.01) G06F 11/16 (2006.01) H03M 1/00 (2006.01) H04B 10/152 (2006.01)
Patent
CA 1220835
A B S T R A C T Disclosed is a measurement apparatus for measuring physical quantity, such as temperature, pressure etc., and providing corresponding measurement data suitable for trans- mission to a remote central location. The physical quantity being measured is first converted to a frequency signal, either directly by an appropriate transducer or by a com- bination of an appropriate transducer and appropriate converter. Counters are then used to convert the frequency signal to a corresponding digital quantity. An appropri- ately programmed digital processor is then used to perform processing operations on the digital quantity to derive the measurement data. In one embodiment, the apparatus includes an optical transceiver for converting the measurement data into corresponding optical signals for transmission via an optical fiber to a central processor. The optical trans- mission system between the measurement apparatus and the central processor includes provisions for facilitating the detection and diagnosis of failures in the optical compo- nents of the system. In another embodiment the measurement data is converted to corresponding current signals for transmission via a conducter to a remote central location. -57-
408285
Nabeta Eiichi
Yasuhara Takeshi
Fuji Electric Co. Ltd.
Kirby Eades Gale Baker
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