Method and system for positioning by using optical speckle
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United States of America Patent
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Mar 27, 2012
Grant Date -
Jun 9, 2011
app pub date -
Dec 10, 2009
filing date -
Dec 3, 2009
priority date (Note) -
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Abstract
A method and system for positioning by using optical speckle are disclosed in this invention. A highly coherent laser light irradiates a positioning template in advance to record optical speckles caused by interference by scattered light beams from the positioning template for establishing a speckle database. Furthermore, a reference point is defined to position each recorded speckle. Therefore, a coordinate with respect to the reference point corresponding to a specified speckle can be used to position a target or applied to distance measurement by the speckle database. The precision of the speckles according to the present invention is within several micrometers. Hence, it can provide high precision positioning.
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