Detection and measurement of small vibrations using electronic speckle pattern interferometry

Høgmoen, Kåre; Løkberg, Ole J.

doi:10.1364/ao.16.001869

Cited by 86 publications

(12 citation statements)

References 8 publications

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“…This may be nonphysiologic, however, since tympanic membrane displacements secondary to acoustic inputs would be much less than this. Nevertheless, this still represents an advance over previously reported patterns with ESPI where visual observation was difficult to detect 14 …”

Section: Discussionmentioning

confidence: 54%

Advances in the Development of the Interferometric Otoscope

et al. 1996

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Present measurement techniques for middle ear function have inherent limitations because they are either spatially insensitive (acoustic immittance) or descriptive and qualitative in nature (otoscopy). By integrating advances in electrooptic technology (fiber optics, miniature diode lasers, solid-state detector arrays) and digital processing, further advances are possible. On the basis of measurements taken with electronic speckle-pattern interferometry on human temporal bones and models, we demonstrate quantitative static and dynamic vibration/displacement characteristics of the tympanic membrane with high spatial resolution. Our presentation emphasizes advantages of optically based methods and demonstrates computerized signal processing capable of fringe localization, enhancement, and counting. Miniaturization and real-time digital image processing in the clinical setting is the goal of this research.

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Section: Discussionmentioning

confidence: 54%

Advances in the Development of the Interferometric Otoscope

et al. 1996

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“…This allows a direct comparison of the expressions obtained for stroboscopic (with the pulses matched to the extremes of the oscillation) and time-averaging techniques, as all of them are now expressed as functions of the same magnitude. The maximum sensitivity for timeaveraging is obtained by setting ∆φ rA =π and choosing conveniently the amplitude of the phase modulation (φ rm ) [1]. When single-exposure stroboscopic is used it is achieved without phase modulation between frames for FW rectification, and with ∆φ r =-π/2 for SL demodulation.…”

Section: Other High-sensitivity Techniquesmentioning

confidence: 99%

“…The detection and measurement of vibrations of very small amplitude can be successfully implemented by means of time-averaging techniques with sinusoidal modulation of the phase of the reference beam [1]. Generally, these techniques do not provide temporal resolution, though it is possible to get it to some degree for sinusoidal vibrations of very small amplitude [2].…”

Section: Introductionmentioning

confidence: 99%

Real-Time Double-Exposure Stroboscopic TV Holography for the Detection of Very Small Vibrations. A Comparison With Other TVH Techniques

Trillo

Doval

Cernadas

et al. 2000

Interferometry in Speckle Light

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We present a novel technique for the enhancement of the sensitivity to small vibrations in double-exposure TVH. It is based in the modulation of the phase of the reference beam with a rectangular waveform in synchronism with the stroboscopic illumination whilst the secondary fringes are generated in real-time by sequential subtraction. Several variants are defined attending to the demodulation process. Their performance is compared to well-established techniques as homodyne time-averaging and single-exposure stroboscopic TVH. The theoretical model of the new technique, its experimental implementation and some demonstrative practical results are reported.

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“…a r is chosen so that we work on the linear part of the first lobe of the Bessel function, 5 and provided a Ӷa r we may do the approximation:…”

Section: ͑5͒mentioning

confidence: 99%

Investigation of the near field of a loudspeaker using tomographic reconstruction from TV-holography measurements

Rustad

Morset

1998

The Journal of the Acoustical Society of America

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It has previously been shown that a three-dimensional mapping of an acoustic field's amplitude and phase may be calculated from a set of TV-holography measurements by use of tomographic techniques. In this paper a thorough mathematical description of this measuring technique is given. An increased number of measured projections improves the tomographic reconstructions significantly. Techniques for obtaining quantitative data for the pressure amplitude of the acoustic field are implemented. The technique is demonstrated by measurements of the near field of a loudspeaker and these measurements are shown to agree well with measurements obtained with a microphone.

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Detection and measurement of small vibrations using electronic speckle pattern interferometry

Cited by 86 publications

References 8 publications

Advances in the Development of the Interferometric Otoscope

Advances in the Development of the Interferometric Otoscope

Real-Time Double-Exposure Stroboscopic TV Holography for the Detection of Very Small Vibrations. A Comparison With Other TVH Techniques

Investigation of the near field of a loudspeaker using tomographic reconstruction from TV-holography measurements

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