Patent ID: 8508750
Filing Date: 2013-08-13
Classification: G01N

Abstract:
1. A friction-coefficient estimating device comprising: an irradiating unit that includes a specularly-reflected light receiving unit that includes a diffusely-reflected light receiving unit that receives a diffusely-reflected light component of a reflected light obtained when the light irradiated from the irradiating unit is reflected at the surface and that detects a diffusely-reflected light intensity that is an intensity of the diffusely-reflected light component; and a control unit that estimates a friction coefficient of the surface based on a first reflected-light intensity coefficient and a second reflected-light intensity coefficient, wherein the first reflected-light intensity coefficient is a ratio of the diffusely-reflected light intensity and the first specularly-reflected light intensity when the first irradiating unit irradiates the light on the surface, and the second reflected-light intensity coefficient is a ratio of the diffusely-reflected light intensity and the second specularly-reflected light intensity when the second irradiating unit irradiates the light on the surface.