Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1987-11-02
1990-02-13
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250231R, H01J 516
Patent
active
049009206
ABSTRACT:
A device for measuring minute elongations of a light wave conductor is constructed as a light wave conductor-type sensing unit assembled of a series connection of a polarizer, a light coupler, a single polarization preserving, doubly refracting monomode light wave conductor enclosed in an elliptical sheathing and an analyzer. A light beam emitted from a laser diode is coupled via a light wave conducting correction cable to the polarizer and upon passage through the sensing unit is coupled via the light wave conducting connection cable to an optoelectric receiver and the electrical signals are evaluated in an electronic circuit. Changes in phase difference of the exiting light wave resulting from the minute changes in length of the light wave conductor are evaluated and scaled as geometric length units.
REFERENCES:
patent: 4269506 (1981-05-01), Johnson et al.
patent: 4495411 (1985-01-01), Rashleigh
patent: 4659923 (1987-04-01), Hicks, Jr.
patent: 4671659 (1987-06-01), Rempt et al.
Federmann Helmut
Kraus Anton
Levacher Friedrich K.
Noack Georg
Felten & Guilleaume Energietechnik Aktiengesellschaft
Nelms David C.
Striker Michael J.
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