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Title: Impurity-doped optical shock, detonation and damage location sensor

A shock, detonation, and damage location sensor providing continuous fiber-optic means of measuring shock speed and damage location, and could be designed through proper cabling to have virtually any desired crush pressure. The sensor has one or a plurality of parallel multimode optical fibers, or a singlemode fiber core, surrounded by an elongated cladding, doped along their entire length with impurities to fluoresce in response to light at a different wavelength entering one end of the fiber(s). The length of a fiber would be continuously shorted as it is progressively destroyed by a shock wave traveling parallel to its axis. The resulting backscattered and shifted light would eventually enter a detector and be converted into a proportional electrical signals which would be evaluated to determine shock velocity and damage location. The corresponding reduction in output, because of the shortening of the optical fibers, is used as it is received to determine the velocity and position of the shock front as a function of time. As a damage location sensor the sensor fiber cracks along with the structure to which it is mounted. The size of the resulting drop in detector output is indicative of the location of the crack.
Inventors:
 [1]
  1. (Albuquerque, NM)
Issue Date:
OSTI Identifier:
869741
Assignee:
United States of America as represented by United States (Washington, DC) SNL
Patent Number(s):
US 5387791
Contract Number:
AC04-76DP00789
Research Org:
Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA
Country of Publication:
United States
Language:
English
Subject:
impurity-doped; optical; shock; detonation; damage; location; sensor; providing; continuous; fiber-optic; means; measuring; speed; designed; proper; cabling; virtually; desired; crush; pressure; plurality; parallel; multimode; fibers; singlemode; fiber; core; surrounded; elongated; cladding; doped; entire; length; impurities; fluoresce; response; light; wavelength; entering; continuously; shorted; progressively; destroyed; wave; traveling; axis; resulting; backscattered; shifted; eventually; enter; detector; converted; proportional; electrical; signals; evaluated; determine; velocity; corresponding; reduction; output; shortening; received; position; front; function; time; cracks; structure; mounted; size; drop; indicative; crack; mode fiber; detector output; entire length; electrical signals; shock wave; optical fibers; electrical signal; optical fiber; damage location; mode optical; shock front; shock velocity; wave traveling; continuous fiber; location sensor; sensor providing; providing continuous; shock speed; measuring shock; /250/385/

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