Radiant energy – Photocells; circuits and apparatus – With circuit for evaluating a web – strand – strip – or sheet
Reexamination Certificate
2008-12-16
2011-11-15
Le, Que T (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
With circuit for evaluating a web, strand, strip, or sheet
C250S221000
Reexamination Certificate
active
08058634
ABSTRACT:
A method for determining a position of a selected area of a sheet of material relative to a reference plane includes launching a first incident light beam at the selected area of the sheet of material such that the first incident light beam strikes the selected area at a first position and a first angle, thereby producing a first reflected light beam. A second incident light beam is launched at the selected area of the sheet of material such that the second incident light beam strikes the selected area at a second position and a second angle, thereby producing a second reflected light beam. The second position and second angle are different from the first position and first angle, respectively. The first reflected light beam and the second reflected light beam are intercepted at the reference plane. Information related to positions at which the reflected light beams were intercepted and angles at which the incident light beams were launched were received and correlated to the position of the selected area relative to the reference plane.
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Corning Incorporated U.S. Appl. No. 11/983,464, filed Nov. 11, 2007.
Microtrack II™ Instruments product brochure.
Chen Xin
Liu Anping
Zhou Naiyue
Bennett Jennifer
Corning Incorporated
Le Que T
Watson Bruce P.
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