Results 161 to 170 of about 6,641 (217)

Electronic Speckle Pattern Interferometry

Topical Meeting on Holography, 1986
Holographic workstations are now enabling the advantages of Holographic Interferometry (HI) to be taken outside research laboratories and placed alongside manufacturing equipment. Most rigidization problems have been overcome but two handicaps still limit its widespread application.
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Electronic speckle pattern interferometry

Physics in Technology, 1980
Historically, the concept of replacing the photographic emulsion by video recording and display occured to several independent groups almost simultanously. Macovsky(1) in USA, Schwomma(2) in Austria and Kopf(3) in West-Germany considered the technique to be based on pure holography.
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Dynamic Holographic-Electronic Speckle-Pattern Interferometry

Journal of Applied Mechanics, 1993
The development of a nondestructive, full-field, quantitative optical technique, and its feasibility to study dynamic deformations of opaque and diffusively reflecting solids under transient loads, are discussed. The technique involves recording a sequence of dynamically changing two-beam speckle interference patterns (also called holographic speckle ...
M. A. Ahmadshahi, Sridhar Krishnaswamy, S. Nemat-Nasser   +2 more
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Long-Distance Electronic Speckle Pattern Interferometry

Optical Engineering, 1988
Electronic speckle pattern interferometry has been used to measure the vibrations and deformations of objects located far from the optical head. Vibration recordings were made for a total path-length difference of up to 200 m with the object outdoors in bright sunshine. This limit was determined by practical considerations.
Ole J. Lokberg, Jan T. Malmo
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Electronic Speckle Pattern Interferometry

SPIE Proceedings, 1987
AbstractThe basic principles of electronic speckle pattern interferometry (ESPI) are described, stressing its close similarity to hologram interferometry. The technique's applications for vibration anddeformation testing within industrial and medical research are outlined. Future developments are discussed.
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Electronic speckle pattern interferometry (ESPI)

Optics and Lasers in Engineering, 1989
Abstract Electronic Speckle Pattern Interferometry (ESPI) is becoming a very common test and measurement tool among industrial users. In its present form it rivals any current techniques for speed and ease of use. With improvements in image quality it has the potential to become the definitive tool for non-destructive testing.
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Electronic Speckle Pattern Interferometry of the Vibrating Larynx

Annals of Otology, Rhinology & Laryngology, 1995
Laser holography is a technique that creates a three-dimensional image of a static object. This technique can be applied to the analysis of vibrating structures. Electronic speckle pattern interferometry uses a laser for illumination of the vibrating object and solid state detectors and digital hardware technology for capturing and processing the ...
G M, Gardner, J, Castracane, M, Conerty, S M, Parnes   +3 more
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Infrared Electronic speckle pattern interferometry at 10 μm

SPIE Proceedings, 2007
Demonstration of electronic speckle pattern interferometry of opaque scattering objects at 10 mm wavelength using a commercial thermal-camera is presented for the first time to our knowledge. The idea of using a wavelength longer than the usual visible ones is to render such holographic displacement measurement techniques less sensitive to external ...
Vandenrijt, Jean-François, Georges, Marc   +1 more
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Flow visualizations using electronic speckle pattern interferometry

The Journal of the Acoustical Society of America, 2017
Imaging air flow in and around a musical instrument is a difficult task, but it can be important for understanding the physics associated with sound production as well as verifying the accuracy of computer simulations. Particle image velocimetry (PIV) has been successfully used to image air flow, but it requires expensive equipment, extensive technical
Whitney L. Coyle, Thomas Moore
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Pulsed lasers in electronic speckle pattern interferometry

Optics & Laser Technology, 1978
Abstract This paper describes the incorporation of a pulsed ruby laser into an electronic speckle pattern interferometer. A technique is described for observing vibrational and transient events with a double pulsed laser and some typical results are given. Results of the application of the interferometer to non-destructive testing are included.
T.J. Cookson, J.N. Butters, H.C. Pollard
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