SHIPS STRAIN MEASURING SYSTEM

A device for determining the flexing stress of a structure at sea, comprising: a source of AC voltage; strain gage means, in contact with said structure and electrically connected to said source of AC voltage, for modulating said AC voltage directly in proportion to the stressing of said structure; amplifier means, electrically connected to said strain gage means, for amplifying said modulated AC voltage; demodulating means, electrically connected to said amplifying means, for converting said modulated AC voltage to a DC voltage which is a proportional and continuously valued representation of said stressing of said structure; first display means, electrically connected to said demodulating means, for indicating the magnitude of said DC voltage; squaring means, electrically connected to said demodulating means, for squaring said DC voltage; averaging means, electrically connected to said squaring means, for providing a voltage output that is the mean value of said squared DC voltage; square root determining means, electrically connected to said averaging means, for providing a voltage output that is the RMS of said DC voltage; and second display means, electrically connected to said square root determining means, for indicating the magnitude of said RMS voltage.

  • Supplemental Notes:
    • This Government-owned invention available for U.S. licensing and, possibly, for foreign licensing.
  • Corporate Authors:

    Department of the Navy

    Washington, DC  USA 
  • Authors:
    • Russell Jr, R B
    • Bates, M R
  • Publication Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 00146572
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: PAT-APPL-291 212 Patent
  • Files: TRIS
  • Created Date: Feb 16 1977 12:00AM