R. Krishna Murthy

Rajpal Singh Sirohi

Mahendra Prasad Kothiyal

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Speckle shearing interferometry: a new method

Applied Optics

This paper presents a number of methods to obtain in-plane displacement, out of plane displacement and slope data using holographic optical elements. The results obtained with a hololens and a holoshear lens are as good as those obtained with conventional optical systems. © 1985 Optical Society of America.

Hololens in speckle and speckle shear interferometry

Holographie gratings in speckle shearing interferometry

Speckle and speckle-shearing interferometer geometries have been combined into a single setup by the use of a small ground glass reference diffuser on the lens pupil. Sheared fields are obtained with a split lens arrangement. Judicious aperturing results in separated diffraction halos at the FT plane. Fringe patterns corresponding to out-of-plane displacement and slope are obtained by filtering via the appropriate halos. A four-aperture arrangement coupled with shearing elements extends the method to obtain the moiré curva ture pattern. © 1985 Optical Society of America.

Speckle and speckle-shearing interferometers combined for the simultaneous determination of out-of-plane displacement and slope

Multiplexing in speckle shear interferometry: An optimal method

Fringe sharpening is required to obtain a higher accuracy of measurement. Nonlinear recording and consequently filtering at the higher-order halos for image formation give sharpened fringes in the image. Furthermore, if the apertures during recording are properly arranged, cross-frequency orders appear, which when used for filtering provide moiré fringes of higher contrast due to intercoupling. © 1984 Optical Society of America.

Fringe sharpening and information coupling in speckle shear interferometry

Image-shearing camera for direct measurement of surface strains

1st European Conf on Optics Applied to Metrology

<title>Speckle Photography For Strain Measurement - A Critical Assessment</title>

Speckle-Shearing Interferometric Technique: a Full-Field Strain Gauge

Experimental Mechanics

Measurement of slopes of structural deflections by speckle-shearing interferometry

Journal of Physics E: Scientific Instruments

An image-shearing speckle-pattern interferometer for measuring bending moments

Speckle shearing interferometry: A new method

Journal	Applied Optics
ISSN	1559128X
Open Access	No