Patent ID: 11938718
Assignee: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
Field: Textile and paper machines (Mechanical engineering)
Classification: CPC B | IPC B

Claim 9:
10. A system for detecting a web media height non-uniformity, comprising:
a roller to apply a wrapping tension to a web media;
a first optical transmitter and first optical receiver pair, wherein the first optical transmitter is adjacent to an end of the roller and is to cause a first light beam to shine along a first path towards an opposite end of the roller, the first light beam to encounter wrapped media along the first path, wherein the first optical receiver is to measure intensity of the first light beam;
a second optical transmitter and first optical receiver pair, wherein the second optical transmitter is adjacent to an end of the roller and is to cause a second light beam to shine along a second path towards an opposite end of the roller, wherein the second optical transmitter and the second optical receiver pair is positioned such that the second light beam will not encounter wrapped media along the second path, wherein the second optical receiver is to measure intensity of the second light beam;
a first intensity measurement engine, to receive data indicative of a measurement of intensity of the first light beam:
a second intensity measurement engine, to receive data indicative of a measurement of intensity of the second light beam; and
an identification engine, to identify a media height non-uniformity based upon the measured intensities of the first and second light beams.