PULSE COMPRESSOR FOR ULTRASONIC DIAGNOSIS

• Main Author: ISHIMURA TOSHIAKI
• Format: Patent
• Language: English
• Published: 06.11.1990
• Subjects: ANALOGOUS ARRANGEMENTS USING OTHER WAVES; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; DIAGNOSIS; HUMAN NECESSITIES; HYGIENE; IDENTIFICATION; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES; MEASURING; MEDICAL OR VETERINARY SCIENCE; PHYSICS; RADIO DIRECTION-FINDING; RADIO NAVIGATION; SURGERY; TESTING

PURPOSE:To execute the pulse compression of an echo signal with high accuracy by providing a first delay line to receive the echo signal, a second delay line to receive the output of each tap, referring wave resistor train to receive the output of each tap and adder circuit to add currents. CONSTITUTION:The chirp wave echo signal is received with an ultrasonic vibrator 1 and amplification processing such as STC is executed to this signal by a pre-amplifier 2. Then, the signal is supplied to a first delay line 11. The outputs of respective taps T1-T4 in the first delay line 11 are respectively supplied to second delay lines (12-1)-(12-4). Then, the currents, which flow to referring wave resistor trains (13-1)-(13-4) by the instantaneous voltage of the echo signal to appear in the respective taps of the second delay lines (12-1)-(12-4) are added by a current adder 14 and the pulse compression of the chirp wave echo signal is executed. Thus, delay quantity among the respective taps T1-T4 in the first delay line 11 is set to be 1/4 of pulse width (t) in the chirp wave echo signal to be outputted from the pre-amplifier 2, for example.