SU1035505A2 - Ultrasound speed meter - Google Patents

Abstract

ULTRASONIC SPEED METER on author. St. No. 58О498, 1 distinguished by the fact that, in order to determine the scale of turbulence of the UST1 / moving medium, it is equipped with a serially connected calculator, blocks of the first and second buffer memory, a first code-analogue converter, a subtractive unit, and a mechanism for moving the ultrasonic devices and amps. a base meter, a clock generator, the output of which is connected to the Reset input of the calculator and the input of the Record of the block with the back-end buffer memory and the second converter code-analog, the input of which is connected to the output of the block of the first buffer memory, the output is with the second input of the subtracting unit, and the output of the base meter is connected to the third input of the adaptive delay device. Od cd sd o (U1

Description

The invention relates to a measuring technique and can be used in any branch of engineering.

According to the main author. St. No. 58О498 a ultrasound velocity meter is known that contains two ultrasonic transducers with acoustic waveguides, one of which is connected to a generator, the other is a receiving device, devices of adjustable and adaptive delays and a pulse c & speaker, the first input of the adaptive delay is connected to the output of the receiving device , the second input through the adjustable delay device and the pulse selector - with the generator output, and the output is connected to the generator input Cll

A disadvantage of the known meter is the impossibility of determining the scale of turbulence of a moving medium, since the measurement result is integrated over time and there is no possibility of changing the base distance.

The purpose of the invention is to provide the possibility of determining the scale of the turbulence of a moving medium. This goal is achieved by the fact that the ultrasound velocity meter, contains. two ultrasonic transforms: bodies with acoustic waveguides, one of which is connected to a generator, the other to a receiving device, devices of adjustable and adaptive delays, and a pulse selector, the first input of the adaptive delay is connected to the output of the receiving device, the second input through an adjustable device delays and pulse selector - with the generator output, and the output is connected to the generator input, equipped with ovally connected downconverter, blocks of the first and second buffer memory, Perv will convert Lemma code-analog vychitakh-. unit, the movement mechanism of the ultrasonic transducers and the meter. base, clock generator, the output of which is connected to the input. Reset calculator and input. Record of the second buffer block, the naMsiTH and the second transducer, the analogue code, the input of which is connected to the output of the first buffer memory, output. the second input of the subtracting unit, and the output of the base meter is connected to the third input of the adaptive delay device.

The drawing shows a structural diagram of an ultrasound velocity meter.

 The ultrasound velocity meter contains a generator D., the output is connected to one ultrasonic transducer 2 with an acoustic conduit 3, the second ultrasonic transducer 4 with an acoustic waveguide 5 is connected to the input of the receiving device 6. The output of the generator 1 is connected to the input of the pulse selector 7, the output

which is connected to the input of the device 8 adjustable delay. The output of the receiving device 6 is connected to the first input 9 of the device 1O adaptive delay, and the output of the device 8 is adjustable

delays - with the second input 11 mouth

Oy adaptive delay U, the output of which is connected to the input of the generator 1 excitation pulses and serially connected by the transmitter 12,

the first 13 and second 14 buffer memory, the first code-to-analog converter 15, the subtractive block 16, the ultrasound transducer 17 and the meter 18

the bases between the ultrasonic transducers 2 and 4. The clock hegger 19 is connected to the input Reset of the calculator 12 and the input of Record 14 of the second buffer memory. Second

The transducer 20 code analogue input is connected to the output of block 14 of the first buffer memory, and the output is connected to the second input of detracting block 16. Output I of the base meter 18 is connected to the third

input device 1O adaptive delay.

The meter works as follows ..

At some point in time, the clock generator 19 generates a pulse, the leading edge of the catfighter resets drive 12 to the initial (zero) state, and unit 14 of the second memory switches to write mode. At the same time, the codes are equal at the inputs of blocks 13 and 14 of the buffer memory, which corresponds to the equality of the potentials at the outputs of the converters 15 and 2O of the code-analogue. Therefore, at the output of the subtracting unit 16, the voltage is zero and the 2-to-4 converters are in the fixed position, this displays a digit on the indicator of the base meter 18 corresponding to the distance between the ultra-.

audio converters 2 and 4, the code from the output of the meter 18 of the base is supplied to the third input of the adaptive delay device Yu, which is implemented, and we’ve built a time expander circuit with a controlled (by the third input) expansion coefficient. The coefficient of expansion K is chosen inversely proportional to the distance between the ultrasonic transducers: 1 / and g e KQ - a constant value with the dimension 8.J - the initial base (the distance between 11 transducers). Thus, the frequency F of the pulse repetition in the syn: focolon does not depend on the base distance F –K C. –ItjjV-, which is the speed of the ultrasound in the controlled environment. The numerical value of the coefficient KQ is selected {faeTs equal to one by selecting the discretization step of the base meter 18. At the first input of the charger 12, the time interval t is extended by It, in which the measured value of the ultrasound velocity dispersion is calculated according to the following dependence) IL & L expectation. After the termination of sy.1 calculating the variance, a command from the second output of the calculator 12 KOI from its output records in the cell of the buffer memory block 13 and is fed simultaneously to the inputs of the block 14 of the second buffer memory and the second code converter 2O. At the output of block 14 of the second buffer memory clock, the code does not change, therefore, at the output of the first converter 15, the code-analog potential does not change either. At the output of the second converter 2O, the code-analogue potential corresponds to the code that has changed at its input, therefore, at the output of the subtractive unit 16 there is a voltage, such as a positive one, that controls the mixing mechanism of the ultrasonic converters 2 and 4 so that the distance between them for example, decreased. Further, the process is repeated as described above until from one measurement cycle to another a change in the speed of ultrasound is observed. Since the maximum dispersion of the ultrasound velocity is obtained at a base distance equal to the diameter of the formations of the moving medium, the scale of the turbulence of the medium is determined from the indications of the base meter 18. The introduction of additional units to the meter allows you to create a closure. This automatic chain is controlled by the maximum of the dispersion of the velocity of the sound of the sound, and it is possible to measure the temporal change of the turbulence scale of the moving medium. The use of the meter allows determining the scale of turbulence of the moving medium, which contributes to more reliable diagnostics of the studied media and wider introduction of ultrasonic measuring instruments.

Claims (1)

ULTRASONIC SPEED METER by ed. St. No. 580498, so that in order to determine the scale of the Hocrrf turbulent moving medium, it is equipped with series-connected calculator, blocks of the first and second buffer memory, the first code-to-analog converter, subtracting block, mechanism movement of ultrasonic transducers and a base meter, a clock generator, the output of which is connected to the Reset * input of the calculator and the input Write block of the second buffer memory and the second code-analog converter, the input of which is connected to the output of the first buffer memory and output - with a second input of the subtractor 'block, and an output meter base is connected to the third input of the adaptive delay unit. q s and „1035505>