Detecting disturbance using optical gap sensing

Details Detecting disturbance using optical gap sensing Detecting disturbance using optical gap sensing

1989-05-11

1991-10-29

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250225, 25023119, H01J 516

Patent

active

050618466

ABSTRACT:
Apparatus for detecting minute disturbance such as seismic vibrations or the like which utilizes an optically clear gap material as the primary sensing element. The gap material is subjected to the disturbance and any reactive change in width or index is sensed optically by monitoring the light transmission properties of the gap material. A particular type of sensor is disclosed consisting of a length of optic fiber having the tip end covered by the gap material with the distal surface bearing a reflective coating.

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