SU970222A1 - Device for measuring flow speed - Google Patents

Description

/. ;: .I --.....; ;;:;: The invention relates to a measurement technique, namely to measuring components of a vortex.

A device for measuring the flow rate is known, comprising electroacoustic transducers, a generator, amplifiers, time interval meters and a recording device 1.

A disadvantage of the known device is that it allows TontjKo to determine the velocity vector modulus without regard to the vortex component.

The closest in technical essence to the proposed invention is a flow velocity meter containing a generator, first and second mode and tori, first and second electroacoustic transducers, a switching unit, phase-measuring devices, an adjustable phase shifter, a difference element, a calculator and 20 control unit 2.

A disadvantage of the known device is the impossibility of measuring the vortex component of the flow velocity.

The purpose of the invention is to extend the functionality of the device due to and, and the flow velocity vortex component.

The goal is achieved by the fact that a device for measuring the flow rate, containing two reversible electroacoustic transducers connected to amplifiers, a generator, a control unit connected in parallel to a first adder and a difference unit, is equipped with p-reflectors, two normalizers, two integrators, a second adder , two rectifiers and a voltage converter - a code, the generator output being connected to reversible electroacoustic converters, the outputs of the amplifiers are connected via normalizers The k inputs of the first adder and difference unit, their outputs through rectifiers and integrators are connected to the inputs of the second adder, the output of which is connected to the input of the converter & time code, while the outputs of the control unit are connected to the second inputs of the integrators and voltage converter - code, FIG. 1 is a block diagram of the device; in fig. 2 - time diagrams illustrating his work. The device consists of n reflectors 1, reversible electroacoustic transducers 2 and 3, generator 4, amplifiers 5 and 6, normalizers 7 and 8 levels, first adder 9, difference unit 10, rectifiers 11 and 12, jpoB 13 and 14 integrato adder 15, control block 16, voltage converter - code 17. The device operates as follows. The generator 4 generates pulses of a predetermined duration and frequency, which are fed to electroacoustic transducers 2 and 3. Electroacoustic transducers 2 and 3, located at the same vertex of the polygon, emit two acoustic pulses in opposite directions along its sides, formed by n reflectors, successively all its sides and returning to the same vertex, having reflected from reflectors 1 located in the other vertices, are received by electroacoustic transducers 2 and 3, amplified amplifiers 5 and 6. The input signals are U (t). i and s ncotH 0 () - U sln uot-i M) in a mixture with Additive interference (-fc) and 1, () are shown in FIG. 2 a. . The output signals of amplifiers 5 and 6 are fed to the normalizers 7 and 8 levels. After performing the normalization operation, the input signals have the same amplitude and o (Fig. 25). The normalization signals U Ct) and U (i) are fed to the inputs of summing 9 and subtracting 10 devices. The sum (J (Fig. 2b) and the difference Up (Fig. 2 g) of the normalized signals are determined: and, respectively, by the expressions i (uot + y) U. LUpSin (LOt +) (t) f1i () i Up 2UpCOs ( wt + Y)) - 42 (t). Total (J to the difference Up signals are fed to the rectifiers 11 and 1.2, respectively. The above signals (FIG. 2e, g.), Th | yygrir | cosiness by integrators 13 and 14 for some interval T, (FIG 2E), a multiple of the carrier frequency period (Fig. 2, 3, and). As a result of integration, the voltages are obtained, which are described by the following expressions:,) .W-1 (t) dl, o) where fc. P, is the conversion factor of the integrators; n is the number of carrier frequency iroids. The output signals of the integrators 13 and 14 are fed to the second adder 15, the output voltage and (fig. 2 k) of which is converted by means of the converter 17. and the digital code N (fig. 2 l, m, n). In the absence of interference, the average value of the normal component of the velocity vortex of a fluid is associated with the following dependence of Un: .1 The effect of interference reduces to the appearance of absolute obstruction - 01 01 / /, KO-I ora will be equal to TTCT, (tk 2W c3t -j l (tb, 0о (i) 6 (With increasing time: integration: interference, caused by interference, decreases significantly. To obtain maximum accuracy, the integration interval must be chosen equal to the maximum possible duration of the emitted signal for this data) circuit, i.e. , Ji T. pt g i mo (n p., - long the emitted signal. Thus, the device allows to measure with a high accuracy the vortex component of the flow velocity. The formula for measuring the flow velocity contains two reversible electroacoustic transducers connected to the transducers, a generator, a control unit and the first adder connected in parallel and a difference unit, characterized in that, in order to expand the functional capabilities of the device by measuring the vortex component of the flow velocity, it is provided with n reflectors, two m normalizers, two integrats Zami, a second adder, the two E rectifier and inverter voltage code, the generator output is connected to the reversible electroacoustic transducer m, amplifier outputs through a normalizer connected to the inputs

The first adder and difference unit, their outputs are connected to the second adder and the integrators to the second adder, the output of which is connected to the input of the voltage source - the code, while the outputs of the control unit are connected to the second inputs of the integrators and the voltage converter is the code.

Sources of information taken into account in the examination

1. Brazhnikov N. I. Ultrasonic phase meter. M., Energie, 1968,

with. 181.

2. USSR Author's Certificate No. 7О8228, cl. G 01 P 5 / OO, 1977 (prototype).

-

Fm: /

one

 -vVWVW

-wVYWWVWWvw

f / "J

"-. UuChLLLLLL / U

F

Xx

f // (l

BUT/

n

iiiilliniUlll J

Claims (1)

Claim A device for measuring flow velocity, comprising two reversible electro970222 electroacoustic transducers connected to amplifiers, a generator, a control unit and a first adder and a difference unit connected in parallel, characterized in that, in order to expand the functionality of the device by measuring the vortex component of the flow velocity , it ^ is equipped with 'η reflectors, two normalizers, two integrators, a second adder, two rectifiers and a voltage code converter, and the generator output is sub it is connected to reversible electro-acoustic transducers, the outputs of the amplifiers through 5 5 normalizers are connected to the inputs of the first adder and the difference unit, their outputs through rectifiers and integrators are connected to the inputs of the second adder, the output of which is connected to the input of the 5 5 voltage isolator — code, and the unit outputs control are connected to the second inputs of the integrators and the voltage-to-code converter.