Optics: measuring and testing – By polarized light examination – With light attenuation
Patent
1995-04-25
1996-10-22
Rosenberger, Richard A.
Optics: measuring and testing
By polarized light examination
With light attenuation
356239, G01B 1124
Patent
active
055682588
ABSTRACT:
A method of measuring a distortion of a transmitting beam, characterized in that a transmitting beam is emitted from a beam generator and projected onto a screen as a bright spot, the bright spot is scanned over a surface of the screen, and a distortion of the transmitting beam is measured on the basis of a distance between a first location of the bright spot on the screen at a first time when the transmitting beam is incident on a beam receiving device in a specified incident direction upon transmitting through a measured body, and a second location of the bright spot on the screen at a second time when the transmitting beam is incident on the beam receiving device in the specified incident direction upon not transmitting through the measured body. A surface shape of a three-dimensional object may also be measured on the basis of a distance between a first location of the bright spot on the screen at a first time when the transmitting beam is incident on a beam receiving device in a specified incident direction upon being reflected from a surface of a three-dimensional measured body, and a second location of the bright spot on the screen at a second time when the transmitting beam is incident on the beam receiving device in the specified incident direction upon being reflected from a surface of a reference body. The present invention provides measurements having improved accuracy for objects of any size irrespective of the resolution of the beam receiving device.
REFERENCES:
patent: 4742237 (1988-05-01), Ozawa
patent: 4794262 (1988-12-01), Sato et al.
patent: 4847510 (1989-07-01), Douglas
patent: 4853777 (1989-08-01), Hupp
Kurita Takao
Miyake Tetsuo
Nagashima Yukiko
Saito Yasunari
Shimizu Kazuaki
Asahi Glass Company Ltd.
Rosenberger Richard A.
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