Accession Number : ADD012737

Title :   Remote Optical Crack Sensing System Including Fiberoptics.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Huang,Shib L ; Scotese,Arthur ; Libeskind,Mark ; Gause,Lee W

Report Date : 13 Jan 1987

Pagination or Media Count : 6

Abstract : An apparatus is disclosed for remotely detecting cracks of sub-critical length which originate from stress raisers in structural materials, wherein the apparatus typically comprises a source of light, strain responsive devices coupled to the fiber and bonded to the structural member in close proximity to the stress raisers, and a light responsive detector which is optically coupled to the fiber and bonded to the structural member in close proximity to the stress raisers, and a light responsive detector which optically coupled to the fiber in order to detect breaks in the fiber induced by either tensile or shear forces eminating from cracks around the stress raisers. (PATENT).

Descriptors :   *PATENTS, *CRACKS, *SOURCES, *STRUCTURAL MEMBERS, *FIBER OPTICS, *CONSTRUCTION MATERIALS, LIGHT, TENSILE PROPERTIES, LENGTH, SUBCRITICAL ASSEMBLIES

Subject Categories : Test Facilities, Equipment and Methods
      Fiber Optics and Integrated Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE