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.
High-resolution gray-scale recorder
NASA Tech Briefs ; 3 , 1
1978-06-01
Miscellaneous
No indication
English
Calibration method for an ultrasonic gray-scale recorder
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