title: Optical method of determination of stress at a point.
abstract: A method of determining stress at a point is suggested here. The effect of bending of a wave front that is due to variations of the refractive index is used to measure different aspects of stresses. A Fourier lens with a cross slit at its front focal plane is used to form interference fringes at planes near its back focal plane. The sample, illuminated by a plane-parallel coherent beam of light, is placed close to a cross slit, and the change in fringe pattern due to axial shift of the spectrum planes of the slits is measured to relate it to the state of stress.
authors.forename: R N
authors.initials: RN
authors.lastname: Chakraborty
authors.forename: S K
authors.initials: SK
authors.lastname: Sarkar
authors.forename: A
authors.initials: A
authors.lastname: Basuray