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

fYear

1989

fDate

25-27 Apr 1989

Firstpage

54

Lastpage

56

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Instrumentation and Measurement Technology Conference, 1989. IMTC-89. Conference Record., 6th IEEE

Conference_Location

Washington, DC

Type

conf

DOI

10.1109/IMTC.1989.36819

Filename

36819