Abstract

The design and fabrication of a prototype optoacoustic signal processor are described. This system uses a fused silica, folded acoustic path, 340-μ sec. delay line, and operates at a 30-MHz center frequency. The light source is a 200-mW GaAs LED, which is located at the focus of a 15-cm diam, f/0.33 reflecting paraboloid. The modulated light is detected by a p-i-n diode at the focus of a matching paraboloid. The entire system is housed in a chassis whose dimensions are 30 × 20 × 18 cm3. The system performs autocorrelation of long coded sequences in which the reference is an active acoustic replica.

© 1973 Optical Society of America

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