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Continuous cable fiber optical pressure sensor

  • US 4,990,769 A
  • Filed: 09/21/1989
  • Issued: 02/05/1991
  • Est. Priority Date: 09/27/1988
  • Status: Expired due to Fees
First Claim
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1. A fiber-optical rigid or semi-rigid pressure sensor, comprising a pressure member which encloses the optical fiber in a sandwich-like fashion in order to modify its optical properties as a function of a pressure applied to the sensor, wherein the pressure sensor is formed by a continuous cable which can be buried and which comprises at least one optical fiber which, when buried, is capable of detecting, along its entire length, components of a pressure applied to a surface zone of the ground, the pressure member having a repetitive structure in a longitudinal direction which is formed by an upstream structure and a downstream structure which are situated in front of and behind the optical fiber, viewed in the direction from the zone of the ground surface where the pressure is applied towards the optical fiber, the width of the upstream structure being at least approximately 1 cm, the pressure member being such that it enables the cable to be wound upon itself in a longitudinal direction and, when unwound, to be bent in a direction transverse to the longitudinal direction.

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