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Title: Imaging photorefractive optical vibration measurement method and device

Patent ·
OSTI ID:873321
 [1];  [1];  [2]
  1. Idaho Falls, ID
  2. Los Alamos, NM
+ Show Author Affiliations

A method and apparatus are disclosed for characterizing a vibrating image of an object of interest. The method includes providing a sensing media having a detection resolution within a limited bandwidth and providing an object of interest having a vibrating medium. Two or more wavefronts are provided, with at least one of the wavefronts being modulated by interacting the one wavefront with the vibrating medium of the object of interest. The another wavefront is modulated such that the difference frequency between the one wavefront and the another wavefront is within a response range of the sensing media. The modulated one wavefront and another wavefront are combined in association with the sensing media to interfere and produce simultaneous vibration measurements that are distributed over the object so as to provide an image of the vibrating medium. The image has an output intensity that is substantially linear with small physical variations within the vibrating medium. Furthermore, the method includes detecting the image. In one implementation, the apparatus comprises a vibration spectrum analyzer having an emitter, a modulator, sensing media and a detector configured so as to realize such method. According to another implementation, the apparatus comprises a vibration imaging device.

Research Organization:
Idaho National Laboratory (INL), Idaho Falls, ID (United States)
DOE Contract Number:
AC07-94ID13223
Assignee:
Becthel BWXT Idaho, LLC (Idaho Falls, ID)
Patent Number(s):
US 6134006
OSTI ID:
873321
Country of Publication:
United States
Language:
English

References (10)

Photorefractive optical lock-in detector journal January 1991
Quantitative measurement of the vibrational amplitude and phase in photorefractive time‐average interferometry: A comparison with electronic speckle pattern interferometry journal July 1994
Vibration modal analysis using all-optical photorefractive processing
  • Hale, Thomas C.; Telschow, Kenneth L.
  • SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, SPIE Proceedings https://doi.org/10.1117/12.255496
conference October 1996
Holographic interferometry using anisotropic self-diffraction in Bi_12SiO_20 journal January 1991
Optical lock‐in vibration detection using photorefractive frequency domain processing journal October 1996
Two-wave mixing and energy transfer in Bi_12SiO_20 crystals: application to image amplification and vibration analysis journal January 1981
Optical Detection of Ultrasound book January 1990
Optical Lock-in Vibration Detection Using Photorefractive Four-Wave Mixing book January 1989
Adaptive Interferometry: A New Area of Applications of Photorefractive Crystals book January 1991
Vibration detection using dynamic photorefractive gratings in KTN/KLTN crystals journal November 1992

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imaging
photorefractive
optical
vibration
measurement
method
device
apparatus
disclosed
characterizing
vibrating
image
providing
sensing
media
detection
resolution
limited
bandwidth
medium
wavefronts
provided
modulated
interacting
wavefront
difference
frequency
response
range
combined
association
interfere
produce
simultaneous
measurements
distributed
provide
output
intensity
substantially
linear
physical
variations
furthermore
detecting
implementation
comprises
spectrum
analyzer
emitter
modulator
detector
configured
realize
according
substantially linear
spectrum analyzer
imaging device
apparatus comprises
difference frequency
sensing media
response range
apparatus comprise
limited bandwidth
output intensity
measurement method
optical vibration
detector configured
refractive optical
detection resolution
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