holographic interferometry


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holographic interferometry

[‚häl·ə′graf·ik ‚in·tər·fə′räm·ə·trē]
(optics)
The study of the formation and interpretation of the fringe pattern which appears when a wave, generated at some earlier time and stored in a hologram, is later reconstructed and caused to interfere with a comparison wave.
References in periodicals archive ?
The hybrid segment is further sub-segmented into the types Embossed hologram, Integral holograms, Holographic interferometry, multichannel hologram and computer generated hologram.
His creative and innovative work included hologram interferometry the Holo-diagram, one of the first methods to make and to evaluate holographic interferometry fringes.
As a noninvasive and full-field measurement method, digital holographic interferometry (DHI) has been widely used in many measurements including deformation [20-22], contour [23, 24], the field of fluid [25, 26], vibration [27,28], and microscopy [29, 30].
If the optical path difference is less than the equivalent wavelength, the real phase distribution of object can be directly obtained without phase unwrapping by the dual-wavelength digital holographic interferometry. If the optical path difference is greater than the equivalent wavelength, the phase unwrapping process will be simplified by dual-wavelength digital holographic interferometry.
For the validation of simulation results the holographic interferometry setup was used.
The goal of the paper is to demonstrate the possibility of using the method of holographic interferometry to estimate the plastic deformation in the zone of contact interaction.
In particular, a large number of applications has been possible thanks to the development of holographic interferometry that enables the static and dynamic displacements of an optical rough surface to be measured (for a detailed treatment of the principles, techniques and application of optical holography see, (Hariharan, 2002; Jones & Wykes, 1989; Vikram, 1982; Johnston, 2006; Johnston, 2009) and references therein.
His major contributions were in soft x-ray measurements of million-degree electron temperatures (he made the first "two-foil" soft x-ray electron temperature measurements), including Bragg-crystal spectroscopy; optical and laser holographic interferometry for plasma densities and shapes; Riser scattering (for plasma electron temperature); Faraday rotation measurements of plasma magnetic fields, as well as external magnetic fields and currents using phase conjugation in single-mode optical fibers.
Holographic interferometry; a Mach-Zehnder approach.
On the other hand, digital holographic interferometry (DHI) has become a powerful technique in modern optics.
Visualisation of temperature fields in the vicinity of heated surfaces was carried out using the method of holographic interferometry. The obtained holographic interferogram images of temperature fields were used to determine the local values of heat transfer coefficients for a heat exchange area without protrusions and were compared with the results for a heat exchange area with triangular protrusions
His team also developed double-exposure holographic interferometry to accurately measure high-speed phenomena resulting from shockwaves at high resolutions.

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