Patent ID: 8729455
Filing Date: 2014-05-20
Classification: G01J,G01V

Abstract:
1. An apparatus for the detection of objects, comprising: an illumination device emitting polychromatic infrared light to implement a light curtain, the light curtain extending along an optical (X) axis and along a slot (Z) axis; an aperture-imaging optics on the optical (X) axis; an aperture on the optical (X) axis, behind the aperture-imaging optics, wherein the aperture comprises an elongated opening extending lengthwise along the slot (Z) axis, wherein the aperture-imaging optics images light curtain light and object light to the aperture; a wavelength-dispersive device that wavelength-dispersively disperses the light passing through aperture in a dispersion (Y) direction; an image sensor for detecting the wavelength-dispersed light, wherein the image sensor transmits image signals corresponding to the detected wavelength-dispersed light; and means for analyzing the image signals and identify materials comprising an object.