Method for inspecting hollow glass products of glass product material
AssigneeCentrum voor Technische Informatica B.V.
InventorJoop Dalstra
Life of this patent
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Abstract
Method and system for inspecting hollow glass products of glass product material, wherein the glass products are manufactured by: a. heating the glass product material; b. forming the heated glass product material into a glass product; c. cooling the formed glass product; wherein inspecting the glass products comprises the following steps: d. making a plurality of images of the glass product under a plurality of mutually different viewing directions relative to the product with the aid of a plurality of infrared light sensitive sensors, wherein step d. is carried out between steps b. and c.; e. processing in combination of the plurality of images for obtaining at least one parameter that depends on a wall thickness of the glass product.
Claims34
A method for inspecting hollow glass products of glass product material, wherein the glass products are manufactured by:
- a. heating the glass product material;
- b. forming the heated glass product material into a glass product in a production flow;
- c. cooling the formed glass product;
- wherein inspecting the glass products comprises the following steps:
- d. making a plurality of images of the glass product under a plurality of mutually different viewing directions relative to the product using a plurality of infrared light sensitive sensors, wherein step d. is carried out between steps b. and c.;
- e. processing in combination of the plurality of images of the glass product for obtaining at least one parameter that depends on a wall thickness of the glass product, wherein the sensors used in step d. are sensitive to infrared light having at least one frequency where the glass product is transparent to the infrared light so that an image of the plurality of images both shows a side of the glass product that faces the sensor with which the image has been made and shows a side of the glass product, located opposite said side, that faces away from the sensor with which the image has been made, wherein the plurality of images in combination cover at least a first area of the glass product that extends around an axial axis of the product, wherein the images seen in a tangential direction of the product overlap each other so that different images show a same part of the glass product, and wherein in step e. the plurality of images are processed in combination according to a principle of tomography for obtaining a lateral glass thickness distribution of the glass that is at least in the first area.
A method for producing and inspecting hollow glass products of glass product material, the method comprising:
- a. heating the glass product material;
- b. forming the heated glass product material into a glass product in a production flow;
- c. cooling the formed glass product;
- wherein inspecting the glass products comprises the following steps:
- d. making a plurality of images of the glass product under a plurality of mutually different viewing directions relative to the product using a plurality of infrared light sensitive sensors, wherein step d. is carried out between steps b. and c.;
- e. processing in combination of the plurality of images for obtaining at least one parameter which depends on a wall thickness of the glass product, wherein the sensors used in step d. are sensitive to infrared light having at least one frequency where the glass product is transparent to the infrared light so that an image of the plurality of images both shows a side of the glass product that faces the sensor with which the image has been made and shows a side of the glass product, located opposite said side, that faces away from the sensor with which the image has been made, wherein the plurality of images in combination cover at least a first area of the glass product that extends around an axial axis of the product, wherein the images seen in a tangential direction of the product overlap each other so that different images show a same part of the glass product, and wherein in step e. the plurality of images are processed in combination according to a principle of tomography for obtaining a lateral glass thickness distribution of the glass that is at least in the first area.
Dependencies are inferred from the claim text.