Patent ID: 8632662

Claim:
A method, comprising: receiving a sheet of material at a sensor assembly, the sensor assembly including a sensor operable to measure a property of the sheet; and generating an air flow that is substantially tangential to the sheet in order to at least partially control a position of the sheet relative to the sensor assembly; wherein the sensor assembly comprises: a first slot in a first surface of the sensor assembly, the first slot receiving at least a portion of air from a first boundary layer of air associated with the sheet, the first boundary layer upstream from the sensor assembly; a second slot in a second surface of the sensor assembly, the second slot providing at least a portion of air in a second boundary layer of air associated with the sheet, the second boundary layer downstream from the sensor assembly, the second surface on an opposite side of the sensor assembly than the first surface; and a third slot in a third surface of the sensor assembly, the third slot providing the air flow that is substantially tangential to the sheet; and wherein the first and second slots are fluidly coupled to a chamber within the sensor assembly, the chamber adjacent to an area of travel of the sheet.