Double-pulsed holography, a technique for the analysis of large surface areas of vibrating components, requires no contact with the vibrating object. The technique solves a classical problem in the area of both acoustic and vibration analysis. The surface of a vibrating object is represented by a series of fringes which connect points with equal displacement amplitudes. Since holography is based on interferometry, accuracy is within a fraction of light's wavelength. Since the laser is pulsed at a relatively rapid repetition rate, the time period between the two pulses is sufficiently fast so that the holographic system does not have to be isolated from the laboratory's background vibration. The recent development of pulsed ruby lasers with large energy outputs and long temporal coherence lengths has made the holographic analysis of large vehicle structures feasible and within the state of the art. A detailed analysis of three holograms is provided.

  • Availability:
  • Supplemental Notes:
    • Presented at SAE Congress and Exposition, Detroit, 26 February-2 March 1979.
  • Corporate Authors:

    Society of Automotive Engineers (SAE)

    400 Commonwealth Drive
    Warrendale, PA  United States  15096
  • Authors:
    • Gerhart, G R
    • Arutunian, G
  • Publication Date: 1979

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00386856
  • Record Type: Publication
  • Source Agency: National Highway Traffic Safety Administration
  • Report/Paper Numbers: SAE 790413, HS-029 240U
  • Files: HSL, USDOT
  • Created Date: Jul 30 1984 12:00AM