SU1413438A1 - Meter of ultrasound velocity in fluctuating media - Google Patents

Abstract

The invention relates to a measurement technique and can be used for automated diagnosis of fluctuating media. The purpose of the invention is to expand the scope of application by providing possible-. registration of fast real-time ultrasound velocity fluctuations as well. The meter contains a generator of 1 pulses, radiating 2 and receiving 3 transducers, a receiver 4, an expander of 5 pulses, an electronic switch 6, an analog memory block 7, a recorder 8, a stable voltage source 9, a resistor 10. and a capacitor 11. The operating principle of the meter is as follows. In the ultrasound velocity measurement range C, fcc, the inverse dependence of the ultrasound velocity on the time f (t) of passage, c (t) (t) is replaced by an exponentially decreasing curve (L - t-1 uuH / C of the voltage U (t) "; 2 silt

Description

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The invention relates to a measurement technique and can be used in automated monitoring and diagnostic systems that fluctuate from media.

The purpose of the invention is the expansion of the field of application due to the possibility of recording the speed of ultrasound also and rapid fluctuations in real time.

Figure 1 shows the structural diagram of the meter; Fig. 2 shows the relationship between the ultrasound velocity and the transit time in the medium. 15

The ultrasound velocity meter in the fluctuating medium contains a pulse generator 1, a transmitter 2, a receiver 20 transmitter 3 and a receiver 4 connected in series to the autocirculation. The meter also contains a pulse converter 5 connected in series, an electronic switch 6, a memory block 7 and

Neither the extended pulse of the electronic switch 6 is closed and the capacitor 11 through the resistor 10 is gradually discharged exponentially.

At the same time, the ultrasound signal emitted by the transducer 2 propagates through the medium under study, is delayed in it by the time Ct) and received by the transducer 3. From the transducer 3 the signal is electrically fed to the receiver input in which it is amplified, filtered, and a short pulse is generated at its output corresponding to the time of reception of the ultrasound signal. This pulse triggers the pulse generator 1, and in memory block 7, the value of the voltage U (t) of the discharge of the capacitor 11 is fixed at a given time. The magnitude of the voltage U (t), directly proportional to the velocity of ultrasound in the medium, is fed to the recorder 8.

. recorder 8, as well as source 9 to 25. The value of U (t) in analog

voltage and a parallel connected resistor 10 and a capacitor 11. The second output of the pulse generator 1 is connected to the input of the expander 5 pulses, the output of the voltage source 9 is connected to the second input of the electronic switch 6, the output of which is connected to the first terminals of the resistor 10 and the capacitor 11. The second terminals of the resistor and capacitor are connected to the common wire, and the output of the receiver 4 is connected to the Record input of the memory unit 7.

The principle of operation of the ultrasound velocity meter is as follows.

In the required range of ultrasound velocity measurement, Cd, „c, the inverse dependence of the ultrasound velocity c on the transit time c (t) l / r (t) (curve 1, figure 2) is replaced by an exponentially decreasing

voltage curve and (t) 1 (curve 2, fig.2).

At the initial time t generator 1

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pulses excites the radiating transducer 2 and at the same time the zalus-. The expander 5 pulses, which expands the pulse by time. During the extended pulse, the electronic key j-r 6 is opened. At the same time, the capacitor 11 is charged to the voltage and so on. up to voltage source 7 voltage. After the end of the extended pulse, the electronic switch 6 is closed and the capacitor 11 through the resistor 10 is gradually discharged exponentially.

At the same time, the ultrasonic signal emitted by transducer 2 propagates through the medium under study, is delayed therein by Ct) and received by transducer 3. From transducer 3 an electrical signal is fed to the input of receiver 4, in which it is amplified, filtered, and a short pulse is generated at its output corresponding to the time of reception of the ultrasonic signal. This pulse starts the pulse generator 1, and in memory block 7, the voltage value U (t) of the discharge of the capacitor 11 is fixed at a given time. The magnitude of the voltage U (t), which is directly proportional to the magnitude of the ultrasound velocity in the medium, enters the recorder 8.

The value of U (t) in analog

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the memory is stored until the signal from receiver 4 arrives at the next measurement cycle. After restarting the pulse generator 1, the measurement process is repeated. Therefore, in the recorder 8, the values of the ultrasound velocity in the medium in each step, sounding are recorded.

Claims (1)

Invention Formula An ultrasound velocity meter in fluctuating media containing a series-connected pulse generator and an emitting electroacoustic converter, a series-connected acoustic-electric converter and receiver and recorder, the input of the pulse generator associated with the output of the receiver, characterized in that providing the possibility of measuring also the rapid fluctuations of the ultrasound velocity, it is equipped with a series-connected impander The input of which is connected to the second output of the pulse generator, the electronic key and the memory unit, the output of which is connected to the recorder by a voltage source and connected in parallel by a resistor and a capacitor, the output of the voltage source is connected to the second input of an elec. 1413438 The first key is resistively connected to the common wire, and the output of the primer and the capacitor are connected to the output of the receiver connected to the second input of the key, their second memory outputs. Sn UH 0 O.fi 0.6 0 0.2 02 0.36 D 5 0.52 OB8 0.8 "G" 1.0 FIG. 2