Patent ID: 9678006
Date: 2017-06-13
CPC Classifications: G01B,G01N,G03G

Claim:
1. An optical sensor, comprising: a light emission system configured to emit an irradiated light of a linear polarization in a first polarization direction toward a surface of a target object from an incident direction which is inclined with respect to a normal direction of the surface of the target object; a light detection system configured to include a light detector arranged on a light path of a diffuse reflected light which is diffusely reflected from an incident plane on the target object, the light detector receiving light passed by an optical element which passes a linear polarization component of a second polarization direction perpendicular to the first polarization direction; and an additional detection system configured to include an additional light detector arranged on a light path of a different diffuse reflected light which is diffusely reflected from the incident plane on the target object without passing the optical element, wherein the light detection system and the additional detection system are arranged on paths different from a light path of a specular reflected light which is emitted from the light emission system and is specularly reflected from the target object.