Optics: measuring and testing – By polarized light examination – With light attenuation
Patent
1998-07-15
2000-03-28
Pham, Hoa Q.
Optics: measuring and testing
By polarized light examination
With light attenuation
356138, 356153, 3561413, 33287, G01B 1126
Patent
active
060438894
ABSTRACT:
A rail misalignment detection system for use in verifying whether fixed span and moveable span rails on a fixed span and a moveable span of a rail bridge, extend within an acceptable range of misalignment when the moveable span is positioned in a closed alignment with respect to the fixed span of the bridge, comprises an optical beam transmitter and a receiver, one mounted on the fixed span and the other mounted on the moveable span, such that the transmitter directs a beam of collimated light to a photocell in the transmitter. The transmitter and receiver are mounted on the respective spans of the bridge such that their position relative to one another corresponds to the relative position or alignment of one set of the rails on the moveable span and fixed span of the bridge. The transmitter and receiver are further positioned relative to one another such that when the rails on the fixed and moveable spans extend within the acceptable range of misalignment the beam from the transmitter strikes the photocell to a sufficient degree to activate the photocell, and when the rails extend beyond the acceptable range of misalignment the beam does not strike the photocell to a sufficient degree to activate the photocell.
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