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DESCRIPTION JPS53137126

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DESCRIPTION JPS53137126
Description 1 Title of Invention
Ultrasonic transmitter braking method
3. Detailed Description of the Invention The present invention relates to a method of braking an
ultrasonic transducer of a transmitter for ultrasonic measurement. When an ultrasonic vibration
element (hereinafter simply referred to as a vibrator) is driven by an electric force, particularly
when it is driven in a pulse manner for measurement etc., the response is that the Q of the
vibrator is high, the presence of the same braking impedance, etc. And the response
characteristic of the acoustic characteristic becomes a problem. In order to improve the response
characteristic of the ultrasonic output, a method by mechanical braking is mainly implemented.
This method is relatively effective in the region where the frequency band used is several
hundred KH7 or more, but less effective when it is less than 100 KH7. An object of the present
invention is to provide an ultrasonic braking method having good vibration response without
mechanical braking when driving an ultrasonic measurement transmitter. According to another
aspect of the present invention, there is provided an ultrasonic transmitter braking method
comprising: inserting a negative immittance transducer between an ultrasonic vibration element
and an amplifier for driving the element; An impedance of the element between the vibration
element and the amplifier excluding the impedance due to the converter is canceled out by the
negative impedance generated by the converter. EndPage: According to the above configuration,
the object of the present invention can be completely achieved. Hereinafter, the braking method
according to the present invention will be described in more detail in comparison with the
conventional driving method. FIG. 1 is a block diagram for explaining the conventional vibrator
driving method. In the figure, 1 is a signal oscillator, 2 is a drive amplifier, and 3 is an ultrasonic
wave transmitter. FIG. 2 is a block diagram for explaining the vibrator damping method
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according to the present invention. In the figure, 1 is a signal oscillator, 2 is a drive amplifier, 3 is
an ultrasonic transmitter, and 4 is a negative immittance converter. FIG. 3 shows an equivalent
circuit of the electrostrictive vibrator. Od is a damping capacitance, Lm is an equivalent
inductance, Cm is an equivalent capacitance, and rm is an equivalent resistance. Assuming that
the equivalent mass of the oscillator is M1, the equivalent stiffness is S, the equivalent
mechanical resistance of the oscillator including the acoustic radiation resistance is RM, and the
force coefficient of the oscillator is A, Lm and 0 m% rm are respectively given by the following
equations. ???????????????? FIG. 4 is a circuit diagram showing an example of
the configuration of a negative impedance converter. Assuming that the input impedance seen
from the terminal a-a 'is ZNi and the impedance connected to the terminal b-b' is ZI, the following
relationship is established. Zui = -KZL ................................................ (1) where K is negative immittance
It is a positive constant determined by the circuit constant of the converter.
Negative immittance converters are roughly classified into two types of open stable negative
immittance converters and short-circuit stable stationary immittance converters in terms of
circuit configuration. The transducer shown in FIG. 4 belongs to the former. Next, the braking
effect by the method of the present invention will be described. FIG. 5 shows a model during
ultrasonic driving according to the present invention. The following basic equation of electromechanical conversion is established with this model. In the model of FIG. 5, 1 represents a
signal oscillator, 42 represents a drive amplifier, ? represents an output voltage of the amplifier,
? represents an output current of the amplifier, and rO represents an output impedance of the
amplifier. -N and -rN are negative immittance components generated by the negative immittance
converter as shown in the above-mentioned equation (1). It (t) is a current flowing in the dynamic
impedance of the oscillator. In equation (2), r is an external force acting on the transmitter, Ym =
1 / Zm is a vibration pre-excitation admittance, and э is a vibration velocity of the vibrator. Y'o
is the admittance when looking from the terminal C-C 'in FIG. 5 to the left, and Yd is the oscillator
damping admittance. From the equation (2), V is obtained as 1 + '= o, and the equation (3) is
obtained. V (t) = (1 / A) 4. m / (Ym + Yd + Y ? (1) и I = 0 / A) и it (t) иииииииииииииииииииииии (3) 11 (1) In order
to investigate the response of the above, if It (s) obtained by Laplace-transforming 1 (t) t is
obtained according to FIG. 5, the following equation (4) is obtained. It (s) = (V (s) 10d8 nobow /
((rorN + 110dS-110118)) (rm + Lm8 '+ 1 / (! ?????????????? d ? 82)... (4)
Assuming that the negative impedance ZNi (refer to the first equation) of the negative immittance
converter shown in FIG. 2 can be expressed by the following equation (5), the equation (4)
Among them, ZL in FIG. 4 is set so as to satisfy? in which the following equations (6) and (7) are
satisfied. That is, if the combined impedance of the oscillator damping impedance and the output
impedance of the drive amplifier is made equal to the input negative immittance of the negative
immittance converter, the equation (4) becomes the following equation (8). ZNi = -110N8-rN ........
(5) Cd = CH ........ иииииииииииииииииииииииииииииииииииииииииииииииииииииииии ... (7) It (s) =-V (s) OdS ... (8) FIG. 6 shows a drive
amplifier output V of a pulse width modulated sine wave.
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FIG. 7 shows a vibration velocity waveform when the vibrator 3 of the oscillator according to the
conventional method shown in FIG. 1 is driven by the output V. иииииииииииииииииииииииииииииииии (9) EndPage: 2 V
(s) = ? и [.Omega ./ (S2 + .omega.)-(1-e "")-41.phi. Is a drive signal amplitude, .omega. Is an
angular frequency, .tau.0 is a pulse width, and h (t-.tau.0) is a time transition function. From the
equations (2) and (8), rt (s) is the following equation a, and the vibration velocity ?? ? (8) of
the oscillator is the following equation (6), and this equation (6) When the axis is returned to the
time axis, equation (3) is obtained. It (S) =-Good и ? [S / (S 2 + ? one, l и (1-e-T 08)-ииииииииииииииииииииииии
? иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии ииииииииииииииииииииииииииииииииииииииииии ииииииииииииииииииииииии (2) v (t) =-(lJ'c + d
(? / A) и [cos ?t-cos? (-?o) h (t-?0 8) shows a vibration velocity waveform in the case of the
method of the present invention. It can be seen from FIG. 8 that complete braking has been
performed. FIG. 9 is a circuit diagram showing an embodiment of a transmitter using the method
of the present invention. In the figure, 1 is a signal oscillator, 2 is a drive amplifier, 3 'is a
vibrator, and ZL is a load of a negative inductance converter. As described above, according to
the method of the present invention, it is ideal over a wide ultrasonic frequency band by
generating more negative impedance than the negative immittance converter which cancels the
output impedance of the drive amplifier and the damping impedance of the oscillator. Braking is
possible, and the characteristics of the transmitter can be significantly improved. Therefore,
when applied to ultrasonic measurement, the effect is remarkable.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of an ultrasonic transmitter
constructed by the conventional ultrasonic transmitter driving method, FIG. 2 is a block diagram
of an ultrasonic transmitter according to the method of the present invention, and FIG. Fig. 4 is a
circuit diagram showing an example of the circuit of the negative immittance converter, Fig. 5 is
a diagram showing the operation of the oscillator according to the method of the present
invention, Fig. 6 is a drive amplifier Fig. 7 is a graph showing the output voltage waveform of Fig.
7, a graph showing the vibration velocity waveform in the case of the conventional method, Fig. 8
a graph showing the vibration velocity waveform in the case of the present invention, FIG. 6 is a
circuit diagram showing an embodiment of the controller. 1 ... signal oscillator 2 ... drive amplifier
3 ... ultrasonic transmitter 4 ... negative immittance converter patent applicant Hideyuki Suzuki
agent barrister Inoroz EndPage: 3 years 41! 1Procedure Amendment June 3, 1977 No.3 Patent
Secretary General Katayama Ishibe, Display of case No. 51850 patent application No. 51850 No.
2, title of invention 2, title of invention Ultrasonic transmitter braking method 36 Related patent
applicant with case of person making correction
EndPage: 4 procedural corrections Showa 384 + l'u Patent Office President Tomi Kumagaya
Zenjion 1811 indications nr ++ t + Is I: r) 1 patent IA fi F, l 51 B 60 No. 2, invention ultrasonic
transmitter braking method 3, correct The number 7 of the invention, the name of the subject
invention of the correction, and the content of the correction of the specification 8 of the
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invention are added separately, and the content of the correction (Japanese Patent Application
No. 52-51850) is corrected.
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