Patent ID: 9239229
Filing Date: 2016-01-19
CPC Classification: G01B,G01M,G01N,G02B,G03F,G05B,Y10S

Claim Text:
1. A system, the system comprising: a plurality of individually drivable elements configured to variably illuminate a pupil surface of the system, each element configured to deviate an incident light beam based on a control signal applied to the element; a measurement illumination instrument having a plurality of light sources each being configured to emit a light beam, wherein the measurement illumination system is configured to emit a plurality of light beams simultaneously; a modulation system configured to modulate a property of each of the plurality of light beams with an individual modulation frequency; a position sensor configured to measure positions of the plurality of light beams after they have interacted with the plurality of individually drivable elements, and to separate the light beams based on their modulation frequencies; and a control system configured to apply control signals to the plurality of individually drivable elements based on the positions measured by the position sensor, wherein the system is a microlithographic illumination system.