Photorefractive Laser Ultrasound Spectroscopy for Materials Characterization

  • K. L. Telschow
  • V. A. Deason
  • K. L. Ricks
  • R. S. Schley

Abstract

Ultrasonic elastic wave motion is often used to measure or characterize material properties. Through the years, many optical techniques have been developed for applications requiring noncontacting ultrasonic measurement. Most of these methods have similar sensitivities and are based on time domain processing using interferometry1. Wide bandwidth is typically employed to obtain real-time surface motion under transient conditions. However, some applications, such as structural analysis, are well served by measurements in the frequency domain that record the randomly or continuously excited vibrational resonant spectrum. A significant signal-to-noise ratio improvement is achieved by the reduced bandwidth of the measurement at the expense of measurement speed compared to the time domain methods. Complications often arise due to diffuse surfaces producing speckle that introduces an arbitrary phase component onto the optical wavefront to be recorded. Methods that correct for this effect are actively being investigated today.

Keywords

Migration Expense Sine Bismuth Refraction 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Reference

  1. 1.
    J. W. Wagner, “Optical Detection of Ultrasound,” Physical Acoustics, Vol. XIX, Eds. Thurston, R.N., and Pierce, A.D., (Academic Press, New York, 1990) Chp. 5.Google Scholar
  2. 2.
    P. Yeh, Introduction to Photorefractive Nonlinear Optics, (John Wiley, New York, 1993).Google Scholar
  3. 3.
    S. I. Stepanov, International Trends in Optics, (Academic Press, New York, 1991) Chp. 9Google Scholar
  4. 4.
    J. P. Huignard and A. Marrakchi, “Two-wave mixing and energy transfer in Bi12SiO20 crystals: application to image amplification and vibration analysis,” Opt. Lett., 6, (12), 622 (1981).CrossRefGoogle Scholar
  5. 5.
    H. R. Hofmeister and A. Yariv, “Vibration detection using dynamic photorefractive gratings in KTN/KLTN crystals,” Appl. Phys. Lett., 61(20), 2395 (1992).CrossRefGoogle Scholar
  6. 6.
    H. Rohleder, P. M. Petersen and A. Marrakchi, “Quantitative measurement of the vibrational amplitude and phase in photorefractive time-average interferometry: A comparison with electronic speckle pattern interferometry,” J. Appl. Phys., 76(1), 81 (1994).CrossRefGoogle Scholar
  7. 7.
    T.C. Hale and K. Telschow, “Optical lock-in vibration detection using photorefractive frequency domain processing,” Appl. Phys. Lett. 69, 2632 (1996).CrossRefGoogle Scholar
  8. 8.
    T.C. Hale and K.L. Telschow, “Vibration modal analysis using all-optical photorefractive processing,” Proc. SPIE Vol. 2849, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications II, Francis T. Yu; Shizhuo Yin; Eds., p. 300 (1996).CrossRefGoogle Scholar
  9. 9.
    J. Khoury, V. Ryan, C. Woods and M. Cronin-Golomb, “Photorefractive optical lock-in detector,” Opt. Lett., 16, 1442 (1991).CrossRefGoogle Scholar
  10. 10.
    R.C. Troth and J.C. Dainty, “Holographic interferometry using anisotropic self-diffraction in Bi12SiO20,” Opt. Lett, 16(1), 53 (1991).CrossRefGoogle Scholar
  11. 11.
    T.C. Hale, K.L. Telschow and V.A. Deason, “Photorefractive optical lock-in vibration spectral measurement,” submitted for publication to Applied Optics.Google Scholar

Copyright information

© Springer Science+Business Media New York 1998

Authors and Affiliations

  • K. L. Telschow
    • 1
  • V. A. Deason
    • 1
  • K. L. Ricks
    • 1
  • R. S. Schley
    • 1
  1. 1.Idaho National Engineering and Environmental LaboratoryLockheed Martin Idaho Technologies CompanyIdaho FallsUSA

Personalised recommendations