Patent ID: 7911585
Filing Date: 2011-03-22
Classification: G03F

Abstract:
1. A measurement apparatus configured to measure a light intensity distribution in a plane to be measured, comprising: a mask including a light-shielding portion and an opening, the light-shielding portion configured to shield a large portion of light for forming the light intensity distribution, the opening having a dimension smaller than a wavelength of the light and transmitting a smaller portion of the light therethrough; a first photoelectric conversion element configured to receive light transmitted through the opening and output a light intensity signal; and a second photoelectric conversion element arranged at a position apart from the first photoelectric conversion element, the second photoelectric conversion element configured to receive light transmitted through the light-shielding portion and output a light intensity signal; wherein the mask, the first photoelectric conversion element, and the second photoelectric conversion element are moved along the plane to be measured; and wherein the light intensity distribution is calculated based on the light intensity signal output from the first photoelectric conversion element and the light intensity signal output from the second photoelectric conversion element.