Optical lock-in vibration detecting using photorefractive four-wave mixing

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Many important applications for photorefractive crystals (PRCs) have been found recently by various investigators. These applications range from volumetric information storage in optical computing to adaptive, remote detection of ultrasonic vibration in optical nondestructive evaluation. In this paper, we propose the use of PRCs for lock-in detection of continuously vibrating structures. A method for achieving lock-in detection using the photorefractive effect was presented by Khoury et al of Rome Laboratory in 1991. They described a technique for the purpose of extracting a small signal phase modulation embedded in a large noise environment. This was carried out by mixing two optical ... continued below

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7 p.

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Chatters, T. & Telschow, K. December 1, 1995.

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  • EG & G, Inc.
    Publisher Info: EG and G Idaho, Inc., Idaho Falls, ID (United States)
    Place of Publication: Idaho Falls, Idaho

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Description

Many important applications for photorefractive crystals (PRCs) have been found recently by various investigators. These applications range from volumetric information storage in optical computing to adaptive, remote detection of ultrasonic vibration in optical nondestructive evaluation. In this paper, we propose the use of PRCs for lock-in detection of continuously vibrating structures. A method for achieving lock-in detection using the photorefractive effect was presented by Khoury et al of Rome Laboratory in 1991. They described a technique for the purpose of extracting a small signal phase modulation embedded in a large noise environment. This was carried out by mixing two optical beams, a signal and a reference, with different phase modulation in a photorefractive medium. They presented a first-step analytical model that described the temporal behavior of a photorefractive lock-in device, along with experimental verification of this behavior. The effects of varying different mixing parameters were described qualitatively. Here, we explore the optical lock-in technique for application in vibration detection and, in particular, its potential for narrowband vibration mode spectral analysis. In addition, we have performed a shot-noise limited signal-to-noise ratio analysis of this device to determine its minimum detectable displacement sensitivity, and simulated the lock-in spectrum analysis method.

Physical Description

7 p.

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OSTI as DE96002511

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  • 22. annual review of progress in quantitative nondestructive evaluation conference, Seattle, WA (United States), 30 Jul - 4 Aug 1995

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  • Other: DE96002511
  • Report No.: INEL--95/00069
  • Report No.: CONF-950785--5
  • Grant Number: AC07-94ID13223
  • Office of Scientific & Technical Information Report Number: 135049
  • Archival Resource Key: ark:/67531/metadc626210

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  • December 1, 1995

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  • June 16, 2015, 7:43 a.m.

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  • April 26, 2016, 6:05 p.m.

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Chatters, T. & Telschow, K. Optical lock-in vibration detecting using photorefractive four-wave mixing, article, December 1, 1995; Idaho Falls, Idaho. (digital.library.unt.edu/ark:/67531/metadc626210/: accessed September 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.