NASA NTRS · 19780000016
Calibration method for an ultrasonic gray-scale recorder
Abstract
Calibrated method for ultrasonic C-scanning is based on direct correlation of gray-scale response to electronic signal used. In procedure, optical density of reference recording is measured to generate curve of reflective intensity versus transmission.
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Moorhead, P. E.. 1978-06-01. Calibration method for an ultrasonic gray-scale recorder. https://ntrs.nasa.gov/citations/19780000016
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