Space integrating sliding image optical correlator

摘要

An optical correlator includes at least one electrically addressable liquid crystal array (11), at least one LED array (10) for generating a reference image which is modulated by changing the transmissivity of the liquid crystals (4) in the liquid crystal array (11), and at least one two-dimensional large size photodiode (7), the photodiode receiving a modulated image from the liquid crystal array. The LED and liquid crystal arrays (10, 11) are stacked together with a photodiode (7) or an array of photodiodes (12) with no space between, for an exceptionally simple, compact and inexpensive optical correlator structure.