Patent ID: 7463994
Filing Date: 2008-12-09
Classification: G01B,G01K,G01N

Abstract:
1. A method for detecting surface state of a work piece wherein: first and second measuring thermocouples in contact with a surface to be measured of the work piece are caused to perform movements with relation to the surface to be measured so that generated thermoelectromotive forces of the measuring thermocouples are measured, and a surface roughness, of the surface to be measured Ry=(α where: ΔE is the thermoelectromotive force, ΔT is the surface temperature variation, Ry is the surface roughness, α β β the surface roughness and/or surface temperature variations are previously obtained by bringing first and second data collecting thermocouples, respectively, the same as or the same kind as the first and second measuring thermocouples, respectively, into contact with a standard surface whose surface roughness and/or surface temperature has been known and by causing the data collecting thermocouples to perform a relative movement with respect to the standard surface under the same contact condition and the same relative movement conditions as those of the first and second measuring thermocouples with respect to the surface to be measured.