SU954873A1 - Meter of ultrasound speed in liquid - Google Patents

Description

one

The image is related to devices for acoustic measurements and can be used in physicochemical analysis in industry.

A device for measuring the speed of ultrasound is known, comprising a probe pulse generator, a transducer, a delay line, an amplifier, and a trigger l.

A disadvantage of the known device is the low sensitivity due to the small output frequency.

The closest to the invention in technical essence and the achieved result is an ultrasound velocity meter in a liquid containing a series-connected probe pulse generator, a radiating converter, a receiving converter, a selector, the second input of which is connected to the output of the probe pulse generator, an amplifier and an integrator, a controlled generator whose input is connected to the integrator's output, the frequency divider, whose input is connected to the output of the controlled oscillator, and the recorder, input d which is connected to the output of the controlled generator 2.

A disadvantage of the known meter is the low sensitivity to speed change in a liquid due to the low output frequency.

The purpose of the invention is to increase the sensitivity of measurements.

The goal is achieved by the fact that the meter is equipped with a series-connected first trigger, the first input of which is connected to the output

15, a second trigger and a switch, the second input of which is connected to the output of the first trigger, and the output is connected to the integrator's input, and a pulse distributor, the first input of which

20 is connected to the output of the frequency divider, the first output is connected to the second input of the first trigger, and the third is connected to the input of the probe pulse generator.

FIG. 1 is a block diagram of a meter; in fig. 2 - time diagrams showing the work of the scheme.

The ultrasound velocity meter in a fluid contains, in series, a probe generator impulse 1, an emitting transducer 2, a receiving transducer 3 / second input of which is connected to the generator output 1 of probe pulses, a collector whose second input is connected to the output of the probe 1 generator pulses, amplifier 5 and integrator 6, frequency divider 7, the input of which is connected to the output of a control generator 8, whose input is connected to the integrator output 6, the recorder 9, whose input is connected to the output control generator 8, connected in series the first trigger 10, the first input of which is connected to the output of the amplifier 5, the second trigger 11 and switch 12, the second input of which is connected to the output of the first, trigger 10, and the output to the input of the integrator 6, and the distributor 13 pulses, The first input of which is connected to the output of the frequency divider 7, the first input to the second input of the first trigger 10, the second output to the second input of the second trigger 1 1, and the third to the input of the probe 1 generator. The meter works as follows. The control (the generator generates a continuous sequence of pulses, And (Fig. 2). These pulses arrive at a divider of -7 M with a factor of; division of frequency frequency divider 7 C, pulses 15 are fed to a distributor of 13 pulses, by 1.2.,. k, n at the outputs of which pulses are formed that are offset in time by the period of the frequency formed at the output of the pulse divider 7. On the leading edge of the pulse 16 from the first output of the distributor 13, the generator 1 of the probe pulses produces a short video pulse 17 to the radiating converter 2 and to the selector at emulating signals, which opens it only at the time of arrival of the useful ultrasonic pulse. The rest of the time, the selector j is closed, which allows the proposed device to get rid of multiply reflected signals. Formed by amplifier 5, the useful electric pulse 18

Claims (2)

from the receiving converter 3 is fed to the S input of the RS trigger 10, the latter generates an output signal, the temporary location of the leading edge of which corresponds to the time of registration of the useful signal. The falling edge of the output signal RS of the trigger 10 is formed on the leading edge of the pulse at the K-th output of the distributor 13, the second is fed to the R input of the RS of the trigger 10. The pulse 19 formed by the trigger 10 is fed to the control input of the switch 12 and to the D input of the 0-flip-flop 11, the synchronization input of which receives a pulse from the second output of the distributor 13 If the pulse period from divider 7 is longer than the propagation time of the ultrasonic pulse in the medium, then the output of the 0-flip-flop 11 generates a signal 20 of the logical unit, the output signal RS t rigger 10 arrives at the control input of switch 12, opens it, connects the output of D-flip-flop 11 to the input of integrator 6, and at the output of integrator 6, voltage 21 increases, which, entering the control input of generator 8, increases its frequency, and, therefore, reduces the period of the pulse following the output of the frequency divider 7. The voltage increase at the output of the integrator 6 occurs only during the pulse at the output of the trigger 10. Assuming that the period of the pulses from the divider 7 is shorter than the propagation time of the ultrasonic pulse in the medium, the operation of the device is similar, with the difference that at the output of the O-flip-flop 11 the logical zero signal will act,. The input of the integrator 6 through the switch 12 will be grounded, the voltage at the output of the integrator 6 will decrease, which will reduce the frequency of the generator 8, and, consequently, increase the period. Thus, in the steady state, the period of the pulse sequence from the divider 7 and the time of propagation of the ultrasonic pulse in the medium are equal, and the signals of the logical zero and units at the input of the integrator 6 alternate. The output frequency of the generator 8 is fed to the recorder 9, where it is measured. The present invention makes it possible to increase the measurement sensitivity, since the output frequency of the controlled oscillator 8 is higher than that of the frequency divider 7, as well as the noise immunity in the absence of a received signal. The invention The ultrasound velocity meter in a fluid, comprising a series-connected probe pulse generator, a radiating transducer, a receiving transducer, a selector, the second input of which is connected to the output of the probe pulse generator, an amplifier and an integrator, / a controlled oscillator whose input is connected to the integrator output, a frequency divider whose input is connected to the output of the controlled generator (Torah), and a recorder whose input 73 is connected to the output of the controlled generator, which distinguishes so that, in order to increase sensitivity, it is equipped with series-connected first trigger, the first input of which is connected to the amplifier output, second trigger, and a switch, the second input of which is connected to the output of the first trigger, and the output to the integrator's input, and distributor. pulses, the first input of which is connected to the output of the frequency divider, the second output to the second input of the first trigger, the second output to the second input of the second trigger, and the third to the input of the probe pulse generator. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 593135, cl. G 01 N 29 / OD, 1976. 2. USSR author's certificate number 356559, cl. G 01 P 3/0, 1970 latype). (pus.2