HEATABLE GLAZING INSPECTION
First Claim
1. A method of inspecting a heatable glazing, the heatable glazing comprising a heater array comprising a heater wire, the method comprising the steps(i) illuminating the heatable glazing with a light source to produce a shadowgraph image of the heatable glazing;
- (ii) passing a sufficiently high electrical current through the heater array such that the heater wire is observable in the shadowgraph image of the heatable glazing, such a shadowgraph image of the heatable glazing being referred to as an active shadowgraph image of the heatable glazing; and
(iii) capturing the active shadowgraph image of the heatable glazing with an imaging sensor.
1 Assignment
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Accused Products
Abstract
A method of inspecting a heatable glazing is disclosed. A heatable glazing comprises a heater array having at least one heater wire. The method comprises the steps of (i) illuminating the heatable glazing with a light source to produce a shadowgraph image of the heatable glazing; (ii) passing a sufficiently high electrical current through the heater array such that the heater wire is observable in the shadowgraph image of the heatable glazing, such a shadowgraph image of the heatable glazing being referred to as an active shadowgraph image of the heatable glazing; and (iii) capturing the active shadowgraph image of the heatable glazing with an imaging sensor. Apparatus for carrying out the method is also disclosed.
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Citations
14 Claims
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1. A method of inspecting a heatable glazing, the heatable glazing comprising a heater array comprising a heater wire, the method comprising the steps
(i) illuminating the heatable glazing with a light source to produce a shadowgraph image of the heatable glazing; -
(ii) passing a sufficiently high electrical current through the heater array such that the heater wire is observable in the shadowgraph image of the heatable glazing, such a shadowgraph image of the heatable glazing being referred to as an active shadowgraph image of the heatable glazing; and (iii) capturing the active shadowgraph image of the heatable glazing with an imaging sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An apparatus for inspecting a heater wire laminated within a heatable glazing, the apparatus comprising a light source for illuminating the heatable glazing to produce a shadowgraph image of the glazing, an imaging sensor to acquire the shadowgraph image and a power supply for applying sufficient electrical current to the heater wire such that the heater wire is observable in the shadowgraph image of the glazing.
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14. Use of a shadowgraph image for inspecting a heatable glazing comprising a heater array having at least one a heater wire.
Specification