Patent ID: 9574967
Date: 2017-02-21
CPC Classifications: G01J,G01M

Claim:
1. A wavefront measurement method comprising steps of: causing object light to be incident on a Shack-Hartmann sensor, which includes an image sensor and a microlens array including a plurality of microlenses, and capturing a first spot image under image pickup conditions; calculating, based on the first spot image, data of first spot positions that correspond to the first spot image; simulating a second spot image based on the image pickup conditions and information of a travelling direction of diffracted light generated when the object light passes through the microlenses; calculating second spot positions that correspond to the second spot image; and correcting the data of the first spot positions based on data of the second spot positions including data of a detection error due to the diffracted light, and calculating data of a wavefront of the object light.