Patent ID: 6649896
Filing Date: 2003-11-18
Classification: G01J

Abstract:
A device for measuring a spatially averaged intensity of a light beam, comprising(a) an electrically non-conducting support which has a surface, and (b) a photoelectric element comprising an array of spatially distributed photoelectric members which are electrically connected with each other, said array being applied to that surface of said support, said array of photoelectric members being adapted to receive and measure the intensity of a light beam directed towards that surface of said support, each of said photoelectric members of said array having a surface adapted to receive, but not to transmit light, said surface of said support comprising a first set of areas each of which is covered by one of said photoelectric members and which thereby does not allow light transmission, and a second set of areas none of which is covered by any one of said photoelectric members and each of which allows light transmission, each of the areas of said second set of areas being located between two or more of said areas of said first set of areas.