Investigations of the Photoconductor-Thermoplastic Image Transducer.
Final scientific rept. 1 Jan-31 Dec 77,
ENVIRONMENTAL RESEARCH INST OF MICHIGAN ANN ARBOR
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A basic research effort was performed to investigate the use of the photoconductor-thermoplastic PTP recording medium as an incoherent-to-coherent transducer that serves as a real-time input device for an optical data processor. The principle of operation of the PTP recording medium is reviewed with a brief discussion of nonlinearities. We describe experimental investigations of the write-time, repetitive writing, resolution, response to a CRT input, and addition of an integral grating. Using parallel plane charging we were able to carry out write cycles charge, expose, and develop in less than 10 msec. With the thermoplastic biased at an elevate temperature, repetitive recording was demonstrated at a rate of 2.5 cyclessec. We incorporated the PTP transducer into an advanced optical processor that used holographic optics to form a lightweight real-time optical data processor. The photoplastic transducer is characterized by good exposure sensitivity, high resolution, and simple construction. Because development and erasure occur only upon deliberate application of heat, the transducer is well suited to applications that require image retention before and during readout. Regardless of the spectral sensitivity of the photoconductor, readout can be at any wavelength. Author
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