Patent ID: 6967718
Filing Date: 2005-11-22
Classification: G01J,G02B

Abstract:
1. An apparatus for measuring wavelength composition of a dispersed spectrum of light comprising: a diffractive light modulator comprising an array of light modulating pixels operable in a first mode and a second mode such that in operation the dispersed spectrum of light illuminates the diffractive light modulator along the array of light modulating pixels and further such that in operation the diffractive light modulator selectively directs a subset of the dispersed spectrum of light into the first mode while directing a remainder of the dispersed spectrum of light into the second mode; a detector coupled to the diffractive light modulator such that in operation the detector detects the subset of the dispersed spectrum of light while not detecting the remainder of the dispersed spectrum of light, wherein the detector comprises an array of detecting elements; an imaging lens, the imaging lens optically coupling the diffractive light modulator to the detector; and an aperture stop located between the imaging lens and the array of detecting elements such that in operation the aperture stop allows the first mode to pass the aperture stop while not allowing the second mode to pass the aperture stop.