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Title: Non-linear optical crystal vibration sensing device

Abstract

A non-linear optical crystal vibration sensing device (10) including a photorefractive crystal (26) and a laser (12). The laser (12 ) produces a coherent light beam (14) which is split by a beam splitter (18) into a first laser beam (20) and a second laser beam (22). After passing through the crystal (26) the first laser beam (20) is counter-propagated back upon itself by a retro-mirror (32), creating a third laser beam (30). The laser beams (20, 22, 30) are modulated, due to the mixing effect within the crystal (26) by vibration of the crystal (30). In the third laser beam (30), modulation is stable and such modulation is converted by a photodetector (34) into a usable electrical output, intensity modulated in accordance with vibration applied to the crystal (26).

Inventors:
 [1]
  1. (Livermore, CA)
Publication Date:
Research Org.:
University of California; Michael J Hughes
Sponsoring Org.:
USDOE
OSTI Identifier:
869431
Patent Number(s):
US 5335548
Assignee:
United States of America as represented by Department of Energy (Washington, DC) OAK
DOE Contract Number:
AC03-89SF18433
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
non-linear; optical; crystal; vibration; sensing; device; 10; including; photorefractive; 26; laser; 12; produces; coherent; light; beam; 14; split; splitter; 18; 20; 22; passing; counter-propagated; retro-mirror; 32; creating; third; 30; beams; modulated; due; mixing; effect; modulation; stable; converted; photodetector; 34; usable; electrical; output; intensity; accordance; applied; non-linear optical; intensity modulated; laser beams; beam splitter; laser beam; light beam; sensing device; electrical output; coherent light; vibration sensing; optical crystal; photorefractive crystal; crystal vibration; /73/356/359/

Citation Formats

Kalibjian, Ralph. Non-linear optical crystal vibration sensing device. United States: N. p., 1994. Web.
Kalibjian, Ralph. Non-linear optical crystal vibration sensing device. United States.
Kalibjian, Ralph. Tue . "Non-linear optical crystal vibration sensing device". United States. doi:. https://www.osti.gov/servlets/purl/869431.
@article{osti_869431,
title = {Non-linear optical crystal vibration sensing device},
author = {Kalibjian, Ralph},
abstractNote = {A non-linear optical crystal vibration sensing device (10) including a photorefractive crystal (26) and a laser (12). The laser (12 ) produces a coherent light beam (14) which is split by a beam splitter (18) into a first laser beam (20) and a second laser beam (22). After passing through the crystal (26) the first laser beam (20) is counter-propagated back upon itself by a retro-mirror (32), creating a third laser beam (30). The laser beams (20, 22, 30) are modulated, due to the mixing effect within the crystal (26) by vibration of the crystal (30). In the third laser beam (30), modulation is stable and such modulation is converted by a photodetector (34) into a usable electrical output, intensity modulated in accordance with vibration applied to the crystal (26).},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jan 11 00:00:00 EST 1994},
month = {Tue Jan 11 00:00:00 EST 1994}
}

Patent:

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  • A non-linear optical crystal vibration sensing device including a photorefractive crystal and a laser is disclosed. The laser produces a coherent light beam which is split by a beam splitter into a first laser beam and a second laser beam. After passing through the crystal the first laser beam is counter-propagated back upon itself by a retro-mirror, creating a third laser beam. The laser beams are modulated, due to the mixing effect within the crystal by vibration of the crystal. In the third laser beam, modulation is stable and such modulation is converted by a photodetector into a usable electricalmore » output, intensity modulated in accordance with vibration applied to the crystal. 3 figs.« less
  • The report describes a non-linear optical crystal vibration sensing device including a photorefractive crystal and a laser. The laser produces a coherent light beam which is split by a beam splitter into a first laser beam and a second laser beam. After passing through the crystal the first laser beam is counter-propagated back upon itself by a retro-mirror, creating a third laser beam . The laser beams are modulated, due to the mixing effect within the crystal by vibration of the crystal. In the third laser beam modulation is stable and such modulation is converted by a photodetector into amore » usable electrical output, intensity modulated in accordance with vibration applied to the crystal.« less
  • A device for determining the stuck point of a drill pipe in a borehole consisting of two relatively movable sections, anchoring means for each section, a sensing means for detecting relative movement of the two sections and producing an inductance representative of the movement. The inductance is transformed into a frequency modulated signal which is transmitted to the surface and converted from a non-linear direct current voltage representation of relative movement to a linear direct current voltage.
  • The body of the device, consisting of 2 relatively movable sections, is lowered into a well at the end of a cable. A bow spring anchor assembly is mounted upon each of the sections in a manner that allows the sections to rotate freely and move axially relative to the bow springs until a measurement is to be made. The sections are locked to the anchor assemblies upon command from the surface and a stuck point measurement is made. A sensing means in the body of the device detects relative movement of the 2 sections and produces a linear signalmore » representing such movement. The sensing means includes a movable spiral wedge-shaped element. (7 claims)« less
  • 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 onemore » 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.« less