Optics: measuring and testing – Angle measuring or angular axial alignment – With photodetection remote from measured angle
Patent
1994-09-07
1997-03-18
Hellner, Mark
Optics: measuring and testing
Angle measuring or angular axial alignment
With photodetection remote from measured angle
3561523, 356 401, 356 501, G01B 1126, G01C 308
Patent
active
056127812
ABSTRACT:
The present invention provides an object reflector detection system, in which laser beam is emitted toward an object reflector and reflection light beam is received to detect presence or absence and position of the object reflector, whereby there are provided a laser beam emitter and a reflection light beam detector, and further a laser beam emitter for emitting polarized irradiation light beam toward the object reflector, and a reflection light beam detector for detecting polarized reflection light beam from the object reflector, and the reflection light beam detector having a first detection means for detecting polarized reflection light beam from the object reflector, a second detection means for detecting polarized light beam different from the polarized reflection light beam from the object reflector and a reflection light beam detection circuit for identifying the object reflector based on comparison between output of the first detection means and output of the second detection means.
REFERENCES:
patent: 3612694 (1971-10-01), Mottier
patent: 3773421 (1973-11-01), Gievers
patent: 4830489 (1989-05-01), Cain et al.
patent: 4874238 (1989-10-01), Ochi et al.
patent: 5267014 (1993-11-01), Prenninger
U.S. Serial No. 08/141,047 specification and drawings "Laser Rotative Irradiation Apparatus Having Reciprocating Laser Scanning System" corresponds to Japanese Laid-Open Publication No. 6-137870.
Hayashi Kunihiro
Hirano Satoshi
Kodaira Jun-ichi
Nishizawa Hiroyuki
Ogawa Yohei
Hellner Mark
Kabushiki Kaisha Topcon
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