Abstract
An incoherent imaging system based on frequency multiplexing is presented. The concept was realized by using piezoelectric-elastoopticspace to frequency converter. By modulating each image pixel at a different temporal frequency, the entire image is converted into,an electrical signal by using a single detector. The spatial information of the original image is thus mapped into the frequency domain of an electrical signal. A one to one relation exists between the spatial frequency domain and the time domain, as well as between the spatial domain and the temporal frequency domains. This mapping allows one to perform spatial frequency manipulations in real time by processing the electrical signal. This multiplexing is obtained by using a two-dimensional array of piezoelectric-elastooptic light modulators. By using these two physical effects jointly, one gains the resonance characteristics of the piezoelectric crystal oscillator, together with the modulating properties of the elastooptic effect. Two schemes were studied and presented. The first is composed of two one-dimensional arrays, each composed of discrete crystals. The second one is based on a monolithic one-dimensional array, where a monolithic array is a piezoelectric wafer in which localized resonant domains are constructed.
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