Patent ID: 9091614
Filing Date: 2015-07-28
Classification: G01M

Abstract:
1. An apparatus for measuring a wavefront of light traveling through test optics, comprising: a light source configured to irradiate test optics with light; a lenslet array including a plurality of lenslets, the lenslet array configured to divide light from the light source that travels through the test optics into a plurality beamlets; a detector array configured to acquire light intensity distribution based on the plurality of beamlets incident on the detector array; and a processing unit configured to execute data processing with the acquired light intensity distribution, the data processing comprising a wavefront estimation process using a ray-based forward propagation model and/or a beamlet-based forward propagation model, wherein, in the ray-based forward propagation model, the processing unit calculates a position of each beamlet incident on the detector array, and wherein, in the beamlet-based forward propagation model, the processing unit calculates an amount of light intensity of each beamlet incident on the detector array.