Patent Number: 6,167,758

Title: Method and apparatus for generating ultrasonic pulses with a specified waveform shape

Abstract: A method and an apparatus for generating ultrasonic pulses of a specified waveform shape w(t) using an ultrasonic transducer (2) includes a power amplifier (6), a memory (9) for storing a signal for excitation of the ultrasonic transducer (2) and a control logic (4). The stored excitation signal is supplied to the transducer (2) via a digital-to-analog converter (5). Repeated adjustment of the stored excitation signal can be effected by supplying, via an analog-to-digital converter (8), the echo pulse signals from the ultrasonic transducer (2) or the output voltage of the power amplifier (6) to the control logic (4) for analysis. The stored excitation signal is substantially an optimal lag filter f.sub.L (t) proper to the transducer and the desired output waveform w(t). The optimal lag filter f.sub.L (t) is calculated as follows: for all reasonable values of lag l a lag filter f.sub.l (t) is calculated for the delayed desired output waveform w(t).fwdarw.w(t-1); lag filter quality P(f.sub.l (t)) is evaluated; and the optimal lag filter f.sub.L (t) is selected corresponding to the value of lag L yielding the best filter quality.

Inventors: Fomitchev; Max I. (Tulsa, OK)

Assignee:

International Classification: B06B 1/02 (20060101); G01N 29/22 (20060101); G01N 29/36 (20060101); G01N 029/04 ()

Expiration Date: 01/02/2018