Optical lock-in vibration detection using photorefractive frequency domain processing

Hale, Thomas Chatters; Telschow, K. L.

doi:10.1063/1.117541

Cited by 12 publications

(7 citation statements)

References 2 publications

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“…[16][17][18][19] One of the successful approaches to detect SAWs with high sensitivity in harsh circumstances due to high sample surface roughness and high levels of environmental vibrations is photorefractive interferometry. This approach has been mainly implemented for detecting SAW [20][21][22][23][24] or acoustic vibration [25][26][27][28][29] induced displacements at one location on the surface of a sample. Moreover, full-field schemes have also been proposed.…”

Section: Introductionmentioning

confidence: 99%

Imaging of transient surface acoustic waves by full-field photorefractive interferometry

Xiong

Glorieux

et al. 2015

Review of Scientific Instruments

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A stroboscopic full-field imaging technique based on photorefractive interferometry for the visualization of rapidly changing surface displacement fields by using of a standard charge-coupled device (CCD) camera is presented. The photorefractive buildup of the space charge field during and after probe laser pulses is simulated numerically. The resulting anisotropic diffraction upon the refractive index grating and the interference between the polarization-rotated diffracted reference beam and the transmitted signal beam are modeled theoretically. The method is experimentally demonstrated by full-field imaging of the propagation of photoacoustically generated surface acoustic waves with a temporal resolution of nanoseconds. The surface acoustic wave propagation in a 23 mm × 17 mm area on an aluminum plate was visualized with 520 × 696 pixels of the CCD sensor, yielding a spatial resolution of 33 μm. The short pulse duration (8 ns) of the probe laser yields the capability of imaging SAWs with frequencies up to 60 MHz.

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Section: Introductionmentioning

confidence: 99%

Imaging of transient surface acoustic waves by full-field photorefractive interferometry

Xiong

Glorieux

et al. 2015

Review of Scientific Instruments

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“…Utilizing this approach, no post-processing is required to produce images of the surface vibration amplitude over large areas. The fundamental approach and application to standing wave imaging of resonant motion in plates have been previously described [7][8][9]. This paper describes the extension of this technique to non-stationary waveforms through imaging of traveling Lamb waves in plates.…”

Section: Introductionmentioning

confidence: 99%

“…A spatial and temporal charge distribution results that reflects the phase information impressed onto the optical signal beam by the vibrating surface. Several optical frequency domain measurement methods of vibration have been proposed using photorefractive two and fourwave mixing in select materials [7][8][9][10][11][12]. Some of these provide a time averaged response that is a nonlinear function of the specimen vibration displacement amplitude.…”

Section: Introductionmentioning

confidence: 99%

Imaging of Lamb Waves in Plates for Quantitative Determination of Anisotropy Using Photorefractive Dynamic Holography

Telschow

Deason

Schley

et al. 1999

Review of Progress in Quantitative Nondestructive Evaluation

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INTRODUCTIONAnisotropic properties of sheet materials can be determined by measuring the propagation of Lamb waves in different directions. Electromagnetic acoustic transduction and laser ultrasonic methods provide noncontacting approaches that are often desired for application to industrial and processing environments. This paper describes a laser imaging approach utilizing the adaptive property of photorefractive materials to produce a real-time measurement of the antisymmetric Lamb wave mode in all directions simultaneously. Continuous excitation is employed enabling the data to be recorded and displayed by a CCD camera. Analysis of the image produces a direct quantitative determination of the phase velocity in all directions showing plate anisotropy in the plane.Many optical techniques for measuring ultrasonic motion at surfaces have been developed for use in applications such as vibration measurement and laser ultrasonics. Most of these methods have similar sensitivities and are based on time domain processing using homodyne, Fabry-Perot [1], and, more recently, photorefractive interferometry [2]. Generally, the methods described above do not allow measurement at more than one surface point simultaneously, requiring multiple beam movements and scanning in order to produce images of surface ultrasonic motion over a large area. Electronic speckle interferometry, including shearography, does provide images directly of vibrations over large surface areas. This method has proven very durable in the field for large displacement amplitudes of several wavelengths. In addition, a sensitivity of /3000 has been demonstrated under laboratory conditions [3]. Full-field imaging of traveling ultrasonic waves using digital shearography has been recently reported with sensitivity in the nanometer range [4]. With this method, optical interference occurs at the photodetector

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“…[8][9][10][11][12][13][14][15] This approach is intended to lead to highly selective detection of weak acoustic components, while suppressing cross-talk from strong vibration components. We try to achieve this by phase modulating the reference beam, and mixing it in the photorefractive crystal with the light coming from the sample, to which we refer from here on as the "signal beam."…”

mentioning

confidence: 99%

“…[8][9][10][11][12][13]23 The key of such approach is to introduce an optical phase modulation with frequency f r in the reference beam and to mix this beam in the photorefractive material with the signal beam that originates from the same laser, and whose optical phase is modulated by an element in its path due to a vibration of interest at frequency f s . The resulting interference pattern in the photorefractive material then has a component that beats at the difference frequency Df ¼ f s À f r .…”

mentioning

confidence: 99%

Spectrally resolved detection of mixed acoustic vibrations by photorefractive interferometry

Xiong

Glorieux

2013

Journal of Applied Physics

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Optical lock-in vibration detection using photorefractive frequency domain processing

Abstract: Frequency domain fluorescence lifetime measurements using synchrotron radiation AIP Conf.

Cited by 12 publications

References 2 publications

Imaging of transient surface acoustic waves by full-field photorefractive interferometry

Imaging of transient surface acoustic waves by full-field photorefractive interferometry

Imaging of Lamb Waves in Plates for Quantitative Determination of Anisotropy Using Photorefractive Dynamic Holography

Spectrally resolved detection of mixed acoustic vibrations by photorefractive interferometry

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