Electronic Speckle Pattern Interferometry

Electronic speckle pattern interferometry (ESPI), also known as TV Holography, is a technique which uses laser light, together with video detection, recording and processing to visualise static and dynamic displacements of components with optically rough surfaces. The visualisation is in the form of fringes on the image where each fringe normally represents a displacement of half a wavelength of the light used (i.e. quarter of a micrometre or so).

ESPI can be used for stress and strain measurement, vibration mode analysis and nondestructive testing.

ESPI is similar to holographic interferometry in many ways, but there are also significant differences between the two techniques.

Read more about Electronic Speckle Pattern InterferometryHow ESPI Works

Other articles related to "electronic speckle pattern interferometry":

Electronic Speckle Pattern Interferometry - ESPI Configurations - In-plane Displacement Gradient Measurement
... Holographic interferometry has no equivalent to in-plane measuring ESPI. ...

Famous quotes containing the words pattern, electronic and/or speckle:

    In almost every marriage there is a selfish and an unselfish partner. A pattern is set up and soon becomes inflexible, of one person always making the demands and one person always giving way.
    Iris Murdoch (b. 1919)

    Ideally, advertising aims at the goal of a programmed harmony among all human impulses and aspirations and endeavors. Using handicraft methods, it stretches out toward the ultimate electronic goal of a collective consciousness.
    Marshall McLuhan (1911–1980)

    Leaves chase warm buses, speckle statued air,
    Pile up in corners, fetch out vague broomed men
    Through mists at morning.
    Philip Larkin (1922–1986)