G - Physics – 01 – B
Patent
G - Physics
01
B
33/139
G01B 13/00 (2006.01) G01B 13/06 (2006.01) G01B 21/00 (2006.01)
Patent
CA 1172846
ABSTRACT An apparatus such as a caliper gauge can be utilized in performing a measurement, such as a thickness measure- ment, of a traveling sheet or the like. The apparatus comprises a surface follower body (18, 72, 74) adapted to be constrained during the measurement for movement along a surface follower path intersecting the path of the sheet (10, 80) and urged by a force toward one surface of the sheet. The body has a gas confining wall (aye, 90, 104) bounded by uniformly distributed pressurized gas supply means (46, 92, 106) for pressurizing a gas bearing region (48, 108, 110) contiguous to the sheet surface with sufficient pressure against the sheet and the wall to levi- tate the body against the urging force. The pressuriza- tion is effected without producing substantial amounts of high velocity gas flow over the surface of the sheet within the gas bearing region. The body is maintained at a distance from the sheet surface that is substantially constant and relatively unaffected by variations in the roughness of the surface.
396029
Accuray Corporation
Macrae & Co.
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