Fiber optic sensor with an optical modulator having a permanent

Details Fiber optic sensor with an optical modulator having a permanent Fiber optic sensor with an optical modulator having a permanent

1986-11-26

1988-05-24

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, 324174, 324208, G01D 534, G01P 348, G01P 354

Patent

active

047467916

ABSTRACT:
A fiber optic sensor for the detection of the position or movement of a component, for example the speed of rotation of a shaft, is described, which is particularly suitable for use in a coarse environment. The optical modulator of the sensor comprises a permanent magnet and a modulator part, the permanent magnet and/or the modulator part being mounted so as to be movable relative to a transmitting and receiving light guide. A change caused by a movement generator, for example the shaft, causes a change in the course of the field lines emanating from the permanent magnet which causes a corresponding movement of the modulator part, whereby a greater or lesser proportion of the light radiated out by the transmitting optical fiber is modulated by the modulator part and is transmitted into the receiving optical fiber. The corresponding modulation of the light according to the intensity, color or polarization is then utilized as a measure of the movement or position of the component, and appropriately analyzed.

REFERENCES:
patent: 3191440 (1965-06-01), Miller
patent: 3804522 (1974-04-01), Smith
patent: 4074128 (1978-02-01), Harris, Jr. et al.
patent: 4319188 (1982-03-01), Ito et al.
patent: 4345482 (1982-08-01), Adolfsson et al.
patent: 4506339 (1985-03-01), Kuhnlein
patent: 4536708 (1985-08-01), Schneider
patent: 4551715 (1985-11-01), Durbin
patent: 4626781 (1986-12-01), Forkel
VDI Report No. 515, 1984, pp. 31-37 by Dr. A. Wiesmeier & P. Schuerdt "Anwendung Faseroptischer Sensoren . . . ".

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