Patent ID: 9651367
Date: 2017-05-16
CPC Classifications: G01B,H01L

Claim:
1. A substrate processing apparatus, comprising: a process chamber into which a substrate to be processed is loaded; a long-shaped window provided on the process chamber; an irradiator provided outside the process chamber and the irradiator being configured to irradiate a first laser beam and a second laser beam to the substrate in the process chamber via the long-shaped window in a manner that an incident point of the first laser beam and an incident point of the second laser beam with respect to the window are aligned substantially along a long side direction of the window; a detector configured to have a light reception surface receiving the first laser beam and the second laser beam which are reflected by the substrate and passing through the window, the detector being configured to detect incident positions of the first laser beam and the second laser beam on the light reception surface; and a calculator configured to calculate a curvature of the substrate by using a relative position of the first laser beam and the second laser beam which are detected by the detector.