Interferometric Vibration Analysis by Wavefront Reconstruction

Powell, Robert L.; Stetson, Karl A.

doi:10.1364/josa.55.001593

Cited by 611 publications

(122 citation statements)

References 4 publications

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“…to get a filtered digital hologram h. Afterwards, the processed hologram is reconstructed using Fresnel transform (1) and the intensity distribution is calculated with use of formula (2). The interferogram reconstructed from the processed hologram h has a much higher signal to noise ratio and strongly suppressed DC term compared to the interferogram reconstructed from a single hologram.…”

Section: Data Evaluationmentioning

confidence: 99%

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Digital Holographic Method for Piezoelectric Transformers Vibration Analysis

Psota

Kopecký

Lédl

et al. 2013

EPJ Web of Conferences

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Abstract. The paper describes a holographic method for vibration analysis in nanometer range. The method was successfully applied on different types of piezoelectric transformers and the measurement results are introduced. To proof the reliability of the method it was done a comparing simultaneous measurement of a piezoelectric component by the holographic method and the well-established single-point interferometric method. Results showing the minimal deviation of both methods are presented in the final part of the paper.

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Section: Data Evaluationmentioning

confidence: 99%

“…Another physical principle suited for vibration analysis is digital holography (DH) [1,2]. The DH based methods are non-invasive, very precise and, in addition, DH enables displacement measurement over the whole-field.…”

Section: Introductionmentioning

confidence: 99%

Digital Holographic Method for Piezoelectric Transformers Vibration Analysis

Psota

Kopecký

Lédl

et al. 2013

EPJ Web of Conferences

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show abstract

“…Horman 1965;Powell & Stetson 1965;Haines & Hildebrand 1966;Heflinger, Wuerker & Brooks 1966). The particular technique used in our stressmeter is double-exposure holographic interferometry and may be understood as a direct extension of the holographic method so far discussed.…”

Section: H O L O G R a P H I C T H E O R Ymentioning

confidence: 99%

Holographic in situ stress measurements

1987

International Journal of Rock Mechanics and Mining Sciences &am

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Summary.A new instrument for measuring the in siru level of stress in boreholes has been developed. The instrument operates on the principle of locally relieving the stresses acting on a rock mass by drilling a small hole into the borehole surface and recording the resultant displacement field by holographic interferometry. Because the recording technique is optical, the entire displacement field due to stress relief is obtained. A description of the stressmeter, theory of the interferometric technique, data reduction methodology, and results of laboratory stress relief calibration tests are presented. In addition, we present results from a field deployment of the instrument in an underground shale mine in Garfield County, Colorado using a test borehole within a support pillar. Sufficient data were obtained to constrain five of six stress components at a shallow level of the test borehole, thereby demonstrating the viability of the holographic technique. The holographic stressrelief data yield an approximate EW maximum horizontal stress direction. By comparison with previous hydrofracture measurements of Bredehoeft et al., our results indicate substantial stress-relief near the pillar face, thus masking any relicts of the far-field tectonic stress.

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“…Holographic interferometry, computer-generated holography, and digital holography are major applications of holography [2,3]. The digital holography technique used in this study was first introduced into the literature by Schnars and Jüptner [4].…”

Section: Introductionmentioning

confidence: 99%

Comparing of phase shifting method and one-dimensional continuous wavelet transform method for reconstruction using phase-only information

Kaya¹,

Saraç²

2017

Turk J Elec Eng & Comp Sci

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Abstract:The one-dimensional continuous wavelet transform method has some advantages in hologram reconstruction, when used in the only phase, compared with the phase shifting method. This paper aims to discuss these advantages. One advantage is related to image quality. Another advantage is less power spent and saving time, because the one-dimensional continuous wavelet transform method uses only one hologram and the phase shifting method uses four holograms for recording and reconstruction processes. One final advantage is that the one-dimensional continuous wavelet transform method can also be used in real-time applications. Within the context of the ongoing optimization studies, this study will make a significant contribution to the literature because of these mentioned advantages.

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Interferometric Vibration Analysis by Wavefront Reconstruction

Cited by 611 publications

References 4 publications

Digital Holographic Method for Piezoelectric Transformers Vibration Analysis

Digital Holographic Method for Piezoelectric Transformers Vibration Analysis

Holographic in situ stress measurements

Comparing of phase shifting method and one-dimensional continuous wavelet transform method for reconstruction using phase-only information

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