NASA NTRS · 19780000017
High-resolution gray-scale recorder
Abstract
Electronic circuit makes it possible to obtain gray-scale recordings with good contrast and linearity over entire recording density range for ultrasonic testing unit. Electronic circuit produces square wave of constant voltage but of varying width. Frequency of square-wave pulses can be adjusted to determine optimum pulse frequency.
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Moorhead, P. E., Davis, T. M., Sorg, R. L.. 1978-06-01. High-resolution gray-scale recorder. https://ntrs.nasa.gov/citations/19780000017
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