Linearization and the PosiTector RTR Replica Tape Reader
Few methods of measurement are perfectly proportional in their response to changes in the property they measure. This is true of replica tape. An averaging procedure applied to the "overlap region" between Coarse and X-Coarse grades of tape is used to compensate for this phenomenon when inspectors use a spring micrometer.
An alternative to spring micrometer measurement of replica tape thickness is use of an instrument like the PosiTector RTR (Replica Tape Reader) which combines height measurement with "linearization" to improve the accuracy and ease of use of the replica method.
Linearization is a technique used to insure uniform accuracy of measurement in many types of advanced sensors. Its use in connection with replica tape is described here.