Optics: measuring and testing – By polarized light examination – With polariscopes
Patent
1990-05-29
1992-06-02
Rosenberger, Richard A.
Optics: measuring and testing
By polarized light examination
With polariscopes
180168, 250225, G05D 100
Patent
active
051181916
ABSTRACT:
A high contrast remotely switchable target discriminator, particularly suitable for use with automatic guided vehicles (AGVs), is disclosed. A laser light source directs light through a first polarizer to reflect off a beam splitter toward a target, which may be an AGV guidepath. The target comprises a reflecting material overlaid with a polarization rotator so that the light then reflected from the target has a polarization different from that from the original light source. The reflected light transmits back through the beam splitter to a second polarizer that transmits only light of the rotated polarization. Light that passes through the second polarizer then strikes a detector. A second polarizer-detector combination may be set to transmit and detect only light of the non-rotated polarization so that a sufficiently large ratio of the two different polarizations may be tested. The polarization rotator may be made of electro-optically birefringent material overlaying a reflector so that the polarization rotation may be switched either on and off, or proportionally, to turn a target either on or off or to identify a particular target. The polarization rotator may also be made of electro-optically birefringent material overlaying a dielectric stack.
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Guided Vehicles End Delivery Delays, Russ Gager, Jun. 1986, pp. 24-27.
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Rosenberger Richard A.
Sinder Fredric L.
Singer Donald J.
The United States of America as represented by the Secretary of
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