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DESCRIPTION JPS51128288

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DESCRIPTION JPS51128288
71 Title of the Invention
Method and apparatus for reducing echo in echo sounding process
3. Detailed description of the invention EndPage: The present invention is a method for reducing
the echo outside the focal line from the reflector in the echo sounding process using the
ultrasonic field focusing on the focal line, and the method The invention relates to an apparatus
for performing the method. The term "cross-sectional area of the ultrasound field" as used herein
means the surface of the intersection between the ultrasound field and a plane perpendicular to
the direction of propagation of the ultrasound field. Echo sounding processing with a focused
ultrasound field having a substantially annular cross-sectional area is effective to focus the
ultrasound field over a large depth. However, it has been found that relatively large side maxima
can occur if the ultrasound used is of the same phase and of constant amplitude over the entire
cross-sectional area. That is, it has been found that the unwanted echo on the focal line side from
the reflector has a relatively large amplitude. In order to reduce the echoes outside the focal line
from the reflector, a first pulse which is in phase over the entire cross-sectional area, at least a
second pulse which is not in phase over the entire cross-sectional area after transmitting the
pulse-like limited ultrasound. It has already been proposed to transmit pulsed limited pulse
ultrasound. From this echo an electrical signal with a weighting factor is obtained, and an echo
with the same transit time is added. For this, Swiss Patent No. 1! Reference may be made to '19
.220 and U.S. Pat. No. 3, g3A, qlig. Pulsed limited ultrasound waves are transmitted one after
another and echoes with the same transit time after the echoes within and outside the focal line
from the reflector are added. The West German parliament number 2.3 for this! Specification
352 and British Patent No. 1; The specification of lI / 3.7 Hiro can be referred to. Although these
two known methods can largely or almost completely eliminate echoes outside the focal line
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from the reflector, devices for implementing these known methods require relatively expensive
circuitry, This is not necessarily valid given the circumstances in which such a device is used.
Accordingly, it is an object of the present invention to provide a method which can reduce side
maxima in the echo sounding process and which can be implemented with less expensive
circuitry than the previously known methods, and an apparatus for carrying out the method. It is.
According to the present invention, there is provided a method of reducing echoes outside the
focal line from the reflector in an echo sounding process using an ultrasonic field focused on the
focal line, wherein the total azimuth angle of 3600 or less is obtained. Transmitting a pulsed
ultrasound wave having a cross-sectional area corresponding to the seven or more first annular
segments possessed; and a first annular segment complementary to the first annular segment to
form a complete ring Receiving echoes from a spatial region corresponding at least in part.
According to the invention, there is also provided an apparatus for reducing echoes outside the
focal line from the reflector in an echo sounding process using an ultrasound field focusing on
the focal line, the annular segment forming a ring. An ultrasonic transducer device having at least
seven transmitting transducers and receiving transducers, each of which is formed on the surface
of the transducers are inclined with respect to the axis of the ring, and operating the transmitting
transducers there And a circuit for transmitting pulsed ultrasound. Corresponding to the annular
quadrants, the cross-sectional area of the received ultrasound pulse corresponds to λ four
annular quadrants of the remainder. The method has members which are separated from the
separate transducer segments forming a total of seven rings, some of these segments being
connected to the transmitter circuit and driven simultaneously by the transmitter circuit and the
other segments being received It can be implemented using an annular ultrasonic transducer
connected to a circuit. The advantage of the method according to the invention is that it is not
necessary to send seven or more EndPages: two or more additional pulses or to store echo
signals. For this purpose, the circuit of the device for carrying out the method according to the
invention is considerably simplified. The invention will now be described with reference to the
accompanying drawings. FIG. 1 shows an annular ultrasonic transducer with an annular housing
5 of substantially U-shaped cross section. The axis of symmetry of the cross-sectional area of the
annular housing 5 is at an angle with the ring axis and intersects the ring axis at a predetermined
distance along the ring axis. The open side of the U-shaped cross section faces the intersection, ie
faces the ring axis. The q equally sized segmented transducer elements 1 to 4 together form a
ring and are arranged in the annular recess of the housing 5. These transducer elements consist
of a piezoelectric layer deposited on epoxy resin / tungsten damping zone 6. The transducer
element comprises a deposited metal layer connected to the housing 5 on the front face of the
transducer element, and individual connection lines (shown in the figure) extending through the
holes provided in the housing 5 and the damping block 6 to the back of the piezoelectric layer.
Power) and through. An epoxy layer 7 is provided to match the acoustic impedance to water and
to mechanically protect the piezoelectric vibrator. Two oppositely disposed piezoelectric
vibrators 1.3 are used for transmission, and two piezoelectric vibrators 2.4 of the remaining part
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are used for reception.
The ultrasound waves transmitted by the vibrating body 1.3 are focused to a focal line along the
ring axis at a predetermined distance from the transducer. The length of the focal line determines
the depth at which good side resolution is obtained. The distance between the focal line and the
transducer substantially depends on the tilt of the piezoelectric oscillator with respect to the ring
axis. The length of the focal line is mainly determined by the width of the piezoelectric vibrator.
The shape of the ultrasound field transmitted by the two vibrators intersects a given surface
perpendicular to the axis, eg a given surface lying between the transducer and the focal line
(ultrasound transmitted from here on) It can be characterized by the cross-sectional area of the
field). The shape of the ultrasound field corresponds to λ oppositely disposed annular
quadrants, and the monkey diameter decreases with the distance from the transducer to the focal
line. An electrical signal for operating the transducer element is obtained by the generator 8. The
generator 8 may be a timing circuit or may be connected / connected to the timing circuit. The
generator 8 is connected to an amplifier 9 whose output is connected to a transducer element
1.3. A transducer element 2.4 for receiving ultrasound echoes is connected to the input of the
amplifier 10, the output of the amplifier 10 being connected to the cathode ray oscilloscope 12
via the rectifier circuit 11. In operation, the generator 8 generates a pulsed limited signal which
is amplified by the amplifier 9 and applied to the λ segments 1.3 and excites them. The element
1.3 transmits an ultrasound field with a cross-sectional area corresponding to two oppositely
arranged annular quadrants. The echo returning from the reflector in and outside the focal line is
received by the segment 2.4 where it is converted into an electrical echo signal. These signals are
sent to the amplifier 10 and the output of the amplifier 10 is rectified and then displayed on the
negative-ray on-scope 12. Although it is preferable to divide the annular ultrasonic transducer
into q segments, specifically specifically t segments of equal size, as in the preferred embodiment,
another division may be performed, for example, transmission and It is also possible to provide
the receiving transducer with only one or more segments each. Also, the receiving transducer
may have a different size than the transmitting transducer, for example, in the case of a quadrant
transducer device, the transmitting transducer may be larger than the annular quadrant to
accommodate the receiving transducer. Can be made smaller or vice versa.
The cathode ray oscilloscope in the above embodiments can be replaced with a recording device
and / or a storage device. In principle, the ultrasound fields required for the method according to
the invention can also be generated by suitably operating the transducer elements arranged in a
matrix at EndPage: 3 using an annular transducer device. it can.
1. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an annular transducer consisting of two
segments, and FIG. 2 shows a block diagram of a circuit for carrying out the method of the
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invention. 1.3 ・ ・ ・ Transducer for transmission 2.4 ・ ・ ・ Receiver agent for reception
Atsushi Asamura 3 persons EndPage: 46, List of attached documents (1) Request-1 J Splint (4)
Committee 1r letter and J (translations of 1 each -7, Inventors other than the above, Inventors
other than the above, Mr. Kikuho [large or agent (1) Inventor's name Ayer, Andre, Grand Shanzo's
name Hyphen, Hoffman's gate + Line 7- ) Agent residence 〒 100 Tokyo Otemachi, Chiyoda-ku,
2nd No. 1 New Otemachi Building 33), ',' whereabout 'name (7046) Patent attorney village
January Shiro procedure correction book (spontaneous) Showa 37 Year! January J1 Patent Office
Secretary 1 Showcase of the Case Showa S / Year Patent Application No. 2 2/2 2 · Title of the
invention,-, y y, ia / '% ji Ic, 0. Method and equipment for reducing-3, place to make corrections
Whereabouts 100 Tokyo, Otemachi 2-chome, Chiyoda-ku, Tokyo No. 2 New Otemachi Building
33), ',' 'Whereabouts Name (7046) Patent Attorney Village January Shiro procedure correction
book (spontaneous) 1954! January J1 Patent Office Secretary 1 Showcase of the Case Showa S /
Year Patent Application No. 2 2/2 2 · Title of the invention,-, y y, ia / '% ji Ic, 0. -Methods and
devices for reducing 3-Relationships with the case to make corrections Patent applicants address
names F, Hoffmann, Roche, Rant, (Company), Akternagell shaft 4, Agent 5, correction order The
date of Showa Date 6, the number of inventions to be increased by correction 7, the target
specification of correction * ff,! Field of request range
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