Method and device for processing wide-band signals having a...

Details Method and device for processing wide-band signals having a... Method and device for processing wide-band signals having a...

G - Physics

01

N

349/42

G01N 29/00 (2006.01) G01H 3/12 (2006.01) G01N 29/40 (2006.01) G04G 7/00 (2006.01) H04B 1/64 (2006.01) H04B 11/00 (2006.01)

Patent

CA 1161542

ABSTRACT OF THE DISCLOSURE In the processing of a wide-band, analog ultrasonic echo signals of a large dynamic range, and especially echo sig- nals generated in the ultrasonic testing of material, signal distortions must be avoided in order to enable an exact analy- sis of fault signals and a good reproducibility. To accomplish this object, the signals generated by an ultrasonic detector are supplied to a linear preamplifier generating analog output signals. The analog output signals are fed to an analog-to- digital converter, which converts them directly and in parallel way into logarithmically encoded digital signals. In these digital signals one bit is assigned to the polarity of the in- put signals while the other bits correspond to the respective level of the ultrasonic echo signal. The analog-to-digital con- verter is composed of a plurality of parallel-connected units, which together define a logarithmic characteristic curve for positive and negative output signals of the preamplifier. The digital signals are supplied to an evaluation unit connected to the analog-to-digital converter. In this manner, notwithstand- ing the wide-band ultrasonic echo signals of large dynamic range, substantially distortionless processing is achieved.

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