Vibration modal analysis using all-optical photorefractive processing

Title: Vibration modal analysis using all-optical photorefractive processing

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Abstract

A new experimental method for vibration modal analysis based on all- optical photorefractive processing is presented. The method utilizes an optical lock-in approach to measure phase variations in light scattered from optically rough, continuously vibrating surfaces. In this four-wave mixing technique, all-optical processing refers to mixing the object beam containing the frequency modulation due to vibration with a single frequency modulated pump beam in the photorefractive medium that processes the modulated signals. This allows for simple detection of the conjugate wavefront image at a CCD. The conjugate intensity is shown to be a function of the first-order ordinary Bessel function and linearly dependent on the vibration displacement induced phase. Furthermore, the results demonstrate the unique capabilities of the optical lock-in vibration detection technique to measure vibration signals with very narrow bandwidth (< 1 Hz) and high displacement sensitivity (sub-Angstrom). This narrow bandwidth detection can be achieved over a wide frequency range from the photorefractive response limit to the reciprocal of the photoinduced carrier recombination time. The technique is applied to determine the modal characteristics of a rigidly clamped circular disc from 10 kHz to 100 kHz.

Authors:: Hale, T; Telschow, K

Publication Date:: 1996-12-31

Research Org.:: Lockheed Martin Idaho Technologies Co., Idaho Falls, ID (United States)

Sponsoring Org.:: USDOE Assistant Secretary for Human Resources and Administration, Washington, DC (United States)

OSTI Identifier:: 439001

Report Number(s):: INEL-96/00140; CONF-960848-38
ON: DE97050834

DOE Contract Number:: AC07-94ID13223

Resource Type:: Conference

Resource Relation:: Conference: Denver `96: 1. conference on space processing of materials, at SPIE International Society for Optical Engineering (SPIE) annual international symposium on optical science, engineering, and instrumentation, Denver, CO (United States), 4-9 Aug 1996; Other Information: PBD: [1996]

Country of Publication:: United States

Language:: English

Subject:: 44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; MECHANICAL VIBRATIONS; MEASURING METHODS; SURFACES; LIGHT SCATTERING; REFRACTION; OSCILLATION MODES; PHASE OSCILLATIONS; AMPLITUDES; FREQUENCY MODULATION; LASER RADIATION; WAVE PROPAGATION; FREQUENCY RESPONSE TESTING; OPTICAL SYSTEMS; SENSITIVITY

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                    Hale, T, and Telschow, K. Vibration modal analysis using all-optical photorefractive processing.  United States: N. p., 1996. 
        Web.

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                    Hale, T, & Telschow, K. Vibration modal analysis using all-optical photorefractive processing.  United States.

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                    Hale, T, and Telschow, K. Tue .  
        "Vibration modal analysis using all-optical photorefractive processing".  United States.  https://www.osti.gov/servlets/purl/439001.

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@article{osti_439001,

  title        = {Vibration modal analysis using all-optical photorefractive processing},

  author       = {Hale, T and Telschow, K},

  abstractNote = {A new experimental method for vibration modal analysis based on all- optical photorefractive processing is presented. The method utilizes an optical lock-in approach to measure phase variations in light scattered from optically rough, continuously vibrating surfaces. In this four-wave mixing technique, all-optical processing refers to mixing the object beam containing the frequency modulation due to vibration with a single frequency modulated pump beam in the photorefractive medium that processes the modulated signals. This allows for simple detection of the conjugate wavefront image at a CCD. The conjugate intensity is shown to be a function of the first-order ordinary Bessel function and linearly dependent on the vibration displacement induced phase. Furthermore, the results demonstrate the unique capabilities of the optical lock-in vibration detection technique to measure vibration signals with very narrow bandwidth (< 1 Hz) and high displacement sensitivity (sub-Angstrom). This narrow bandwidth detection can be achieved over a wide frequency range from the photorefractive response limit to the reciprocal of the photoinduced carrier recombination time. The technique is applied to determine the modal characteristics of a rigidly clamped circular disc from 10 kHz to 100 kHz.},

  doi          = {},

  url          = {https://www.osti.gov/biblio/439001},
  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {1996},

  month        = {12}

}

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