SU629490A1

SU629490A1 - Media physical parameter checking method

Info

Publication number: SU629490A1
Application number: SU721828072A
Authority: SU
Inventors: Николай Иванович Бражников; Элеонора Дмитриевна Крылова
Original assignee: Предприятие П/Я М-5671
Priority date: 1972-09-15
Filing date: 1972-09-15
Publication date: 1978-10-25

Description

Изобретение относитс к приборастроению и может примен тьс , например , в- ультразвуковых расходомерах. Известен способ контрол физических параметров сред, основанный на измерении времени прохождени через среду, например жидкость, ультразвуковых колебаний, вводимых по звукопроводу наклонно через стенку трубопровода . По известному способу выбор часто ты ультразвуковых колебаний и угла ввода осуществл етс без учета параметров стенки трубопровода, вследствие чего по вл ютс дополнительные фазовые сдвиги при вводе колебаний, снижающие точность измерений.The invention relates to instrumentation and can be applied, for example, in ultrasonic flow meters. A known method of controlling the physical parameters of media, based on measuring the time of passage through a medium, such as a liquid, of ultrasonic vibrations introduced obliquely through a conduit through a conduit. According to a known method, the frequency of ultrasonic oscillations and the angle of entry are chosen without taking into account the parameters of the pipeline wall, as a result of which additional phase shifts occur during the introduction of oscillations, which reduce the accuracy of measurements.

Цель изобретени - повышение точности измерени .The purpose of the invention is to improve the measurement accuracy.

Дл этого по предлагаемому способу угол ввода устанавливают равным arCsm(Co/VrC t),a частоту -itCil/VzEFor this, according to the proposed method, the input angle is set equal to arCsm (Co / VrC t), and the frequency is -itCil / VzE

где CQ - скорость ультразвука в звукопроводе;where CQ is the speed of ultrasound in the core;

Claims

Invention Formula

A method of controlling the physical parameters of the media, based on measuring the passage time through the medium, for example, fluid, ultrasonic vibrations, is inserted obliquely through the conduit through the pipeline wall, characterized in that, in order to improve the measurement accuracy. H - wall thickness 17 - integer (1,

2 ...). At the same time, the choice of the input angle and frequency, the phase shift introduced by the pipeline walls does not depend on the modified ultrasound velocity in the liquid. The implementation of this method consists of the fact that the slope of the sound duct and the frequency of emitting ultrasonic vibrations are set in accordance with the indicated correlations. The time offset is measured, for example, by a phase device, and its value determines the value of the monitored parameter, for example, the flow rate.

i € 294904

color angle set CJt propagation speed

(Cp / VzCii), a frequency -; transverse oscillations in the material tfC "t / VTKj of the pipeline wall;

where GO is the ultrasound velocity bs - wall thickness

(Soundtrap tt is an integer (1,2 ...).