METHODS AND SYSTEMS FOR MEASURING SPECKLE TRANSLATION WITH SPATIAL FILTERS

摘要

Two or more spatial filters (302) are used in determining velocity based on speckle translation. A light source (102) may be turned on, turned off, or both for a variable amount of time during operation. The velocity may then be determined with trend identification, correlation, recursive frequency estimation, or measurement bandwidth variation. A confidence level may also be calculated for the measured velocity, and the measured velocity reported or used only when the calculated confidence level meets or exceeds a given value.