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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an example of an ultrasonic flowmeter to
which the present invention can be applied, and FIG. 2 shows an example of a wharf proximity
meter to which the present invention can be applied. Figs. 3, 4 and 5 are views showing the state
of the ultrasonic waveform by the conventional ultrasonic wave emitting device, Fig. 5 is a view
showing an attachment example of the wave transmitting element according to this invention,
and Fig. 6 is this invention FIG. 7A to FIG. 7C are waveform diagrams showing an operation
example thereof. 20 ...... mounting plate, 21, 22 ...... wave transmitting device, 23 ...... signal
oscillator, 24 ...... frequency converter.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultrasound
emitting device for emitting pulsed ultrasound. Ultrasonic launchers are widely used in ultrasonic
flowmeters as shown in FIG. 1 and quay approach meters as shown in FIG. The wave transmitting
element λ and the wave receiving element 3 are provided so that the phase can be held, and the
ultrasonic wave (1) / Liy / ····, which is generated when the electric balusda is applied to the wave
transmitting element. The displacement of the time until it reaches the wave receiving element 3
measures the flow rate of the fluid flowing in the flow rate pipe /. In addition, the approach to
quay access is provided with the ultrasonic wave transmitting / receiving element 2 at the tip of
the ship, and the time from when the ultrasonic wave is emitted toward the quay from here is
measured from the ship 6 to the quay. ? It is a gain that can be compensated up to In this case,
conventionally, as shown in FIG. 3, a pulse signal ps is applied to the transmitting element lc to
obtain an ultrasonic wave / l of an attenuation waveform, which is applied to the receiving
element / J or shown in FIG. As described above, by applying an AC burst wave BS to the
transmitting element / 3, an ultrasonic wave / & of the burst wave is obtained, and this is applied
to the receiving element / j. As described above, since the conventional ultrasonic wave emitting
apparatus uses the ultrasonic wave of the attenuation waveform or the burst wave, when the
ultrasonic wave is absorbed by the air bubble or the like in the propagation meridian, a
difference is generated in a certain manner. become. -In the past, it was impossible to form
pulsed ultrasound. Therefore, an object of the present invention is to provide an ultrasonic wave
emitting apparatus capable of emitting a pulse-shaped ultra-fine wave without the abovementioned drawbacks (2). This invention will be described below. This invention relates to
ultrasonic emission, and is provided with a plurality of transmission elements generating ultrathin waves, and an estrus device for forming electric signals of different frequencies and applying
them to each transmission element. The ultrasonic waves output from the wave transmitting
element are synthesized to obtain pulsed ultrasonic waves. That is, as shown in FIG. 51, the
transmission element mounting plate 20Vc is mounted with two sets of forceps and / or two and
oscillation of a predetermined frequency from the signal generator as shown in FIG. S / is applied
to one of the transmission couplers, frequency conversion is performed by the frequency
converter た, and the No. 42 S2 is applied to the other transmission element U. The appearance
of the waveform at this time is shown in FIG. 7 (Al, (B1. However, the frequency of the ultrasonic
wave output from the wave transmitting element 2 / and n also corresponds to the frequency of
the application E. Are also different. Thus, combining two such different ultrasound signals is the
It is possible to obtain an ultrasonic signal that periodically generates a pulse-like waveform as
shown in ff1 (C). (3) Note that although in the above description, signals of λ different
frequencies are applied to two transmission elements, the number of transmission elements is