Patent ID: 9134109
Filing Date: 2015-09-15
Classification: G01B,G01N,G02B,G03H

Abstract:
1. A phase image acquisition device comprising: a light source configured to emit light to irradiate a moving object; a first optical system configured to split the emitted light in two behind the object so as to yield first light and second light, and modulate the second light with a modulator; a second optical system configured to cause a heterodyne interference between the first light and the modulated second light; a detection unit comprising a light-receiving surface that has pixels arrayed in a first direction and configured to receive light being heterodyne interfered on the light-receiving surface, and output data representing a sum in a second direction of light having reached each pixel on the light-receiving surface, at each position in the first direction at each time, wherein the first direction is a direction on the light-receiving surface yielding a fixed Doppler shift effect caused by a movement of the object and perpendicular to a moving direction of the object, and the second direction is a direction orthogonal to the first direction and parallel to the moving direction of the object; and an arithmetic unit comprising a calculator and configured to perform a one-dimensional Fourier transform of data employing the position in the first direction on the light-receiving surface and time as variables with respect to a time variable and a two-dimensional Fourier transform of the Fourier-transformed data, so as to yield data obtained by the two-dimensional Fourier transform as an image of the object.