Patent ID: 7414738

Claim:
A measuring device for measuring at least one optical property of a coating of a substrate, comprising: a device for transporting the substrate in a first direction; at least one measuring instrument; a device for transporting the at least one measuring instrument in a second direction, said second direction being transverse with respect to said first direction; and a stationary support for said substrate having a continuous gap along the second direction; wherein the substrate is provided with a coating at one side thereof; the at least one measuring instrument includes at side of the substrate a light transmitter and at the other side of the substrate a light receiver, so that the light of the light transmitter impinges the light receiver through said gap; a resistance measuring instrument having a specific distance from the light transmitter is provided at the side of the substrate where the coating is provided; and wherein the device for transporting the measuring instrument synchronously transports said resistance measuring instrument in the second direction.