Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Using radiant energy
Patent
1979-04-30
1982-03-09
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Using radiant energy
73657, 332 751, 350 9629, 455610, 455615, G01R 3100, H01S 300, H04B 900
Patent
active
043191860
ABSTRACT:
The presence of a signal is sensed by a signal transducer around which an optical fibre is wrapped so that the length of the fibre is modulated by any signal present. A laser supplies coherent light to one end of the fibre and a homodyne detector is provided at the other end. Discontinuities at both ends of the fibre cause multiple reflections which produce differential phase modulations of the signal. The detected signal contains a large number of frequency components and the peak frequency is related to the amplitude of the original signal. The peak frequency is indicated by a suitable filter arrangement.
REFERENCES:
patent: 4002896 (1977-01-01), Davies et al.
Karlsen Ernest F.
National Research Development Corporation
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