A compact real-time acousto-optic image correlator
The design and development of a compact acousto-optic image correlator capable of performing real-time correlations on grayscale imagery will be described. The system utilizes one-dimensional optical devices to perform the desired two-dimensional correlation. The two-dimensional correlation is performed as a series of multichannel time-integrating correlations between each input image line and a reference template that is stored in an electronic memory. The rows of the reference template are introduced into the processor in parallel using a one-dimensional laser diode array. The correlation in the vertical direction is performed using a modified charge-coupled device (CCD) operating in the shift-and-add mode. A laser diode array, as opposed to an LED array used in previous systems, provides more power so that full use can be made of the dynamic range capabilities of the acoustoptic device and CCD. Key features of the system will be presented, including the random access template memory, the custom laser diode array consisting of 64 individually addressed laser diodes, and the custom optical design to achieve nearly diffraction-limited image quality and compactness. 7 refs., 7 figs.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- Sponsoring Organization:
- DOE/DP
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 6658149
- Report Number(s):
- SAND-89-3009C; CONF-900756--24; ON: DE90015564
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
47 OTHER INSTRUMENTATION
ACOUSTIC DETECTION
ACOUSTIC MEASUREMENTS
CHARGE-COUPLED DEVICES
CHARGED PARTICLE DETECTION
CORRELATIONS
DESIGN
DETECTION
IMAGE PROCESSING
LIGHT EMITTING DIODES
OPTICAL SYSTEMS
PROCESSING
RADIATION DETECTION
REAL TIME SYSTEMS
SEMICONDUCTOR DEVICES
SEMICONDUCTOR DIODES