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Title: Vibration modal analysis using all-optical photorefractive processing

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:
;
Publication Date:
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

Citation Formats

Hale, T, and Telschow, K. Vibration modal analysis using all-optical photorefractive processing. United States: N. p., 1996. Web.
Hale, T, & Telschow, K. Vibration modal analysis using all-optical photorefractive processing. United States.
Hale, T, and Telschow, K. Tue . "Vibration modal analysis using all-optical photorefractive processing". United States. https://www.osti.gov/servlets/purl/439001.
@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}
}

Conference:
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