Holographic | Holographic

Key Words: interference, metrology, Eclipse, Holographic interferometry, double exposure interferometry, interferometry, hologram

Definition:Like interference methods, holographic interferometry is a non-contact optical technique used to measure surface microstructures as well as static and dynamic displacements

TECHNOLOGY:

The standard technique for holographic interferometry is performed by splitting coherent light (e.g. a monochromatic laser) into two beams: an object beam and a reference beam. The object beam is used to illuminate a subject of interest producing a reflected wave form that is collected by a photosensitive recording device (CCD camera) or material, while the reference beam is shone directly incident to the recording instrument. The interference fringes (see double beam interference) recorded allow for the production of a hologram, a three-dimensional reconstruction of the subject, which can be viewed passing a beam of the same wavelength over the recording material. The advantages of holographic interferometry is that it allows for the accurate capture of surface information with a microscope resolution down to the size of the source wavelength.

APPLICATIONS:

Computer based analysis of holographic interferograms is ideally suited to applications requiring an exceptional level of sensitivity and precision for the analysis of non-reflective surfaces. The technique enables the creation of very accurate target reconstructions, possessing rich information on surface characteristics including roughness, shape and waviness.

Holographic interferometry is also commonly used for the examination of refractive index distributions and various forms of non-destructive testing, component inspection and for the visualization of fluid flow.

MICROSCOPE CONFIGURATION:

Nikon Eclipse LV150 series

Nikon Eclipse 100D

NIS Elements software

RECOMMENDED SYSTEM:

Please consult your local Nikon representative

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