Title :
A high-speed digital peak detector and averager for acoustic microscopy
Author :
Gopalan, K. ; Roberts, R.A. ; Markovich, J.G. ; Vaitekunas, J.J.
Author_Institution :
Dept. of Eng., Purdue Univ. Hammond, IN, USA
Abstract :
The authors describe a low-cost PC-based data-acquisition system for nondestructive evaluation of ceramics using acoustic microscopy. A flash digital peak-detector-encoder, an accumulator-shifter, and a buffer memory enable the system to use 50-100 MHz ultrasonic transducers for detecting surface nonuniformities on the order of a few tens of micrometers. The system can display an image having a variable number of rows and up to 4096 columns of pixels, each of which is obtained by averaging from 1 to 4096 peak data at the corresponding scan position. The total response time for the present choice of comparators and flip-flops is approximately 12 ns for detecting a peak analog voltage
Keywords :
acoustic microscopy; ceramics; computerised instrumentation; data acquisition; microcomputer applications; signal processing equipment; surface topography measurement; ultrasonic materials testing; 12 ns; 50 to 100 MHz; PC-based data-acquisition; accumulator-shifter; acoustic microscopy; averager; buffer memory; ceramics; comparators; flash digital peak-detector-encoder; flip-flops; high-speed digital peak detector; nondestructive evaluation; surface nonuniformities; ultrasonic transducers; Acoustic signal detection; Ceramics; Delay; Detectors; Displays; Flip-flops; Microscopy; Pixel; Ultrasonic transducers; Voltage;
Conference_Titel :
Instrumentation and Measurement Technology Conference, 1989. IMTC-89. Conference Record., 6th IEEE
Conference_Location :
Washington, DC
DOI :
10.1109/IMTC.1989.36819
