The sound wave displacement-based ultrasonic meter dependence on various atmospheric factors

The dependence of speed of ultrasound in air on various climatic factors operating in the atmosphere has a significant impact on the accuracy of the ultrasonic flow measurement method. The article examines how to analyse, calculate and form mathematical formulas for air speed dependencies on all foreseen atmospheric factors that can affect the accuracy and results of measurements. The results obtained will be used for creating a mathematical model in MATLAB environment. The examination of a great number of sources suggests that a mathematical model of the speed of sound evaluating various influencing factors in a wide range has not been created until now. The article provides a partial analysis on this issue that would be applicable only for a partial application of the model used for an acoustic impulse mete

The sound wave displacement-based ultrasonic meter dependence on various atmospheric factors

The dependence of speed of ultrasound in air on various climatic factors operating in the atmosphere has a significant impact on the accuracy of the ultrasonic flow measurement method. The article examines how to analyse, calculate and form mathematical formulas for air speed dependencies on all foreseen atmospheric factors that can affect the accuracy and results of measurements. The results obtained will be used for creating a mathematical model in MATLAB environment. The examination of a great number of sources suggests that a mathematical model of the speed of sound evaluating various influencing factors in a wide range has not been created until now. The article provides a partial analysis on this issue that would be applicable only for a partial application of the model used for an acoustic impulse mete

Flow meters review and analysis / Srauto greičių matuoklių apžvalgos analizė

In the article dealt the speed-flow meters, they are classified according to the working of the principle, discussed the advantages, disadvantages, a comparative review. The examination of all possible flow measurement methods, they can be sort into five major groups. The aim was to review the different approaches used to measure the voltage amplitude value of a signal and to describe the capabilities of a projected instrument system. The most modern technological processes take measurement of flowing gas flow rate and flow. For this purpose, ultrasound, especially pulsed time are widely stared to apply. The most pulsed temporal method for measuring disadvantage is that a signal amplitude can vary only in strictly defined limits. Othewise, the signals may not be given or taken in wrong moment. Santrauka Kuriant naują srauto greičio matavimo metodą, pirmiausia ištiriame alternatyvių matavimo būdų privalumus, trūkumus ir veikimo principus. Straipsnyje nagrinėjami srautų greičio matuokliai. Jie klasifikuojami pagal veikimo principą, aptariami privalumai, trūkumai, atlikta palyginamoji apžvalga. Išnagrinėjus visus galimus srauto matavimo metodus, juos galima skirstyti į penkias stambias grupes. Raktiniai žodžiai: matavimų inžinerija, srauto matuoklis, greičio matuoklis, ultragarsinis matuoklis, tūrinis matuoklis, Doplerio matuokli