Then a different scanner takes a new measurement further down the line after the process or application has occurred. As an example, this can be used to measure the thickness of a coating applied to a wire. By measuring the wire before and after the coating has been applied, the two measurements can be correlated to obtain the thickness of the coating. This option requires the use of an encoder so that the same spot at which the line was measured the first time can be measured again. The second scanner looks at the encoder distance and the line speed to know when to take it's measurement.
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