Method of and apparatus for determining glossiness of surface of a body
AssigneeKawasaki Steel Corporation
InventorsYuichiro Asano, Motoji Shiozumi, Hitoshi Aizawa, Yoshiaki Shibata
Life of this patent
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Abstract
A method and apparatus classifies and grades glossiness based on the visible feeling by the light reflection intensity distribution of a surface of a body, wherein specular reflection intensities and total reflection intensities are detected for two known light fluxes projected at predetermined incident angles. The specular reflection intensities and the total reflection intensities are processed, to thereby determine the glossiness of the work to be measured.
Claims11
A method of determining glossiness of a surface to be measured, wherein the glossiness based on visible feeling is classified and graded in accordance with a light reflection intensity distribution of said surface to be measured, comprising the steps of:
- (a) presetting wavelengths .lambda.1, .lambda.2 and incident angles .theta.1, .theta.2 of first and second light fluxes, respectively, such that .lambda.1, .lambda.2, .theta.1, .theta.2 and a standard deviation .sigma. of a height distribution of a profile of said surface satisfy the following relationships:
- (4.pi..sigma./.lambda.1.cos .theta.1).sup.2 .ltoreq.1
- (4.pi..sigma./.lambda.2.cos .theta.2).sup.2 .gtoreq.4
- (b) predetermining for a sample of representative surfaces of known varying glossiness specular reflection intensities I1, I2 and total reflection intensities S1, S2 from said first and second light fluxes, respectively;
- (c) plotting representative points corresponding to I1/S1 and I2/S2 on a two dimensional plane for said representative surfaces, smoothly fitting a curve 1 to such plotted points, and storing such curve in a processing section;
- (d) projecting said first and second light fluxes having wavelengths .lambda.1 and .lambda.2, respectively, upon said surface to be measured at said incident angles .theta.1 and .theta.2, respectively;
- (e) detecting, for said first and second light fluxes, respectively, specular reflection intensities I1 and I2 and total reflection intensities S1 and S2 of said surface to be measured;
- and
- (f) determining in said processing section the glossiness of the surface to be measured by plotting a point corresponding to I1/S1 and I2/S2 for said surface to be measured on said two dimensional plane and comparing said plotted point to at least one straight line m perpendicularly intersecting said curve 1.
A method of determining glossiness of a surface to be measured, wherein the glossiness based on visible feeling is classified and graded in accordance with a light reflection intensity distribution of said surface to be measured, comprising the steps of:
- (a) presetting wavelengths .lambda.1, .lambda.2 and incident angles .theta.1, .theta.2 of first and second light fluxes, respectively, such that .lambda.1, .lambda.2, .theta.1, .theta.2 and a standard deviation of a height distribution of a profile of said surface satisfy the following relationships:
- (4.pi..sigma./.lambda.1.cos .theta.1).sup.2 .ltoreq.1
- (4.pi..sigma./.lambda.2.cos .theta.2).sup.2 .gtoreq.4
- (b) predetermining for a sample of representative surfaces of known varying glossiness specular reflection intensities I1, I2 and total reflection intensities S1, S2 from said first and second light fluxes, respectively;
- (c) plotting representative points I1/S1 and I2/S2 on a two dimensional plane for said representative surfaces, smoothly fitting a curve 1 to such plotted points, and storing such curve in a processing section;
- (d) projecting said first and second light fluxes having wavelengths .lambda.1 and .lambda.2, respectively, upon said surface to be measured at said incident angles .theta.1 and .theta.2, respectively;
- (e) detecting, for said first and second light fluxes, respectively, specular reflection intensities I1 and I2 and total reflection intensities S1 and S2 of said surface to be measured;
- and
- (f) determining in said processing section the glossiness of the surface to be measured by plotting a point P corresponding to I1/S1 and I2/S2 for said surface to be measured on said two dimensional plane and determining a distance along said curve 1 from a reference point R on said curve 1 to a foot Q of a perpendicularly drawn line from said point P to said curve 1.
A method of determining glossiness of a surface to be measured, wherein the glossiness based on visible feeling is classified and graded in accordance with a light reflection intensity distribution of said surface to be measured, comprising the steps of:
- (a) presetting wavelengths .lambda.1, .lambda.2 and incident angles .theta.1, .theta.2 of first and second light fluxes, respectively, such that .lambda.1, .lambda.2, .theta.1, .theta.2 and a standard deviation .sigma. of a height distribution of a profile of said surface satisfy the following relationships:
- (4.pi..sigma./.lambda.1.cos .theta.1).sup.2 .ltoreq.1
- (4.pi..sigma./.lambda.2.cos .theta.2).sup.2 .gtoreq.4
- (b) predetermining for a sample of representative surfaces of known varying glossiness specular reflection intensities I1, I2 and total reflection intensities S1, S2 from said first and second light fluxes, respectively;
- (c) plotting representative points corresponding to I1/S1 and I2/S2 on a two dimensional plane for said representative surfaces, determining one or more glossiness boundary lines Z using a discriminant function whereby overlapping of representative points of adjoining groups of glossiness are minimized and storing said one or more boundary lines in a processing section;
- (d) projecting said first and second light fluxes having wavelengths .lambda.1 and .lambda.2, respectively, upon said surface to be measured at said incident angles .theta.1 and .theta.2, respectively;
- (e) detecting, for said first and second light fluxes, respectively, specular reflection intensities I1 and I2 and total reflection intensities S1 and S2 of said surface to be measured;
- and
- (f) determining in said processing section the glossiness of the surface to be measured by plotting a point corresponding to I1/S1 and I2/S2 for said surface to be measured on said two dimensional plane and determining where said point is located with respect to said one or more boundaries Z.
An apparatus for determining glossiness of a surface to be measured, wherein the glossiness based on visible feeling is classified and graded in accordance with a light reflection intensity distribution of said surface to be measured, said apparatus comprising:
- first and second light sources having wavelengths .lambda.1 and .lambda.2, positioned to project light fluxes upon said surface to be measured at incident angles .theta.1 and .theta.2, respectively, such that a standard deviation .sigma. of a height distribution of a profile of said surface to be measured and .lambda.1, .lambda.2, .theta.1 and .theta.2 satisfy the following relationship:
- (4.pi..sigma./.lambda.1.cos .theta.1).sup.2 .ltoreq.1
- (4.pi..sigma./.lambda.2.cos .theta.2).sup.2 .gtoreq.4
- two light receivers for detecting respective specular reflection intensities I1 and I2 and respective total reflection intensities S1 and S2 of said surface to be measured projected by said first and second light sources, respectively;
- and
- processing means for evaluating the glossiness of said surface to be measured based on said detected specular reflection intensities I1 and I2 and said detected total reflection intensities S1 and S2, and utilizing a relationship between the glossiness and ratios of said intensities I1/S1 and I2/S2.
Dependencies are inferred from the claim text.