Measuring and testing – Vibration – By mechanical waves
Patent
1997-05-02
1999-11-02
Williams, Hezron
Measuring and testing
Vibration
By mechanical waves
600447, G01N 2400, A61B 800
Patent
active
059748915
ABSTRACT:
A simple, compact and inexpensive ultrasonic wave diagnostic apparatus of electronic focus type in which the delay amount for controlling the phase of a transmission signal for each piezoelectric element is stored in a delay amount storage unit, the pulse width for controlling the frequency of the transmission signal for each piezoelectric element is stored in a pulse width storage unit, the time elapsed from a reference time point is counted by a counter, a change point of the transmission signal from the reference time point is calculated by a processor, the output of the processor is compared with the output of the counter by a comparator, a plurality of clock signals having different phases are generated by a multiphase clock generator, a clock generated by the multiphase clock signal generator is selected by a selective controller, and a pulse of the transmission signal is generated on the basis of the selected clock by a toggle circuit. The delay amount, the duty factor and the frequency of the transmission signal are controlled for each piezoelectric element to converge the ultrasonic wave beam, thereby making possible a highly accurate diagnosis with high image quality.
REFERENCES:
patent: 4611494 (1986-09-01), Uchiyama
patent: 4841492 (1989-06-01), Russell
patent: 4870971 (1989-10-01), Russell
patent: 5415172 (1995-05-01), Tannaka
Akiyama Hisashi
Uchikawa Akiko
Kwok Helen C.
Matsushita Electric - Industrial Co., Ltd.
Williams Hezron
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