Optics: measuring and testing – By light interference – For dimensional measurement
Reexamination Certificate
2011-01-11
2011-01-11
Connolly, Patrick J (Department: 2877)
Optics: measuring and testing
By light interference
For dimensional measurement
C356S493000
Reexamination Certificate
active
07869056
ABSTRACT:
A tilting angle measuring device includes an optical device, a four-quadrant optical detector and a computing unit. By the optical device, a light beam emitted by the coherent light source is processed into a reference beam and a test beam. The four-quadrant optical detector has four photoelectric converting units arranged in an array for respectively receiving the reference and test beams. The computing unit is electrically connected to the four-quadrant optical detector for computing a tilting angle of the object with respect to a predetermined position according to four intensity values of the test beam.
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Bursanescu, L., and Vasiliu, V., “Laser System for High Accuracy Alignment and Positioning,” American Institute of Physics, Rev. Sci. Instrum. 65 (5), pp. 1686-1690, May 1994.
Connolly Patrick J
Kirton & McConkie
National Central University
Witt Even R.
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