SU1307324A1 - Method of determining component concentration of binary gas mixtures - Google Patents

Abstract

The invention relates to the field of determining the composition of substances by acoustic methods. The aim of the invention is to expand the field of application and improve accuracy by reducing the duration of the test and using the dependence of the velocity of ultrasonic vibrations of the mixture components on pressure and temperature. In order to maximize the sensitivity of the method for determining the concentration of components of binary gas mixtures, the test gas mixture placed in the test chamber 1 with the source 2 and the receiver 3 of the ultrasonic oscillations placed in it is adiabatically compressed by the piston 6. In the process of adiabatic compression, the temperature varies throughout the volume of the test mixture gases uniquely associated with pressure. According to the measured parameters: ultrasound velocity (UST) under normal, external conditions, and pressure and velocity of UST during adiabatic compression, taking into account calibration dependences, determine the temperature and concentration of the components of binary gas mixtures. 1 il. (L

Description

The invention relates to the study of materials by determining their chemical and physical properties, in particular using ultrasonic vibrations, and can be used in determining the concentration of the components of a binary gas mixture. The purpose of the invention is to expand the field of application and improve accuracy by reducing the duration of the tests and using the dependence of the velocity of ultrasonic vibrations of the mixture components on pressure and temperature.

The drawing shows a block diagram of a device that implements the proposed method for determining the concentration of binary components: x gas mixtures.

The device contains a test chamber 1 and emitter 2 and 3 of ultrasonic vibrations placed in it. The emitter 2 is connected to the output of the ultrasonic oscillator 4, and the receiver is the 3rd input of the speed measurement unit 5, the second input of which is connected to the output of the generator 4. In the test chamber 1, the piston 6 moves. The pressure meter 7 is connected to the test chamber 1.

The method for determining the concentration of components of binary gas mixtures is carried out as follows.

In the test chamber 1, the test gas mixture is placed under normal external conditions. With the help of a generator. 4 excite radiator 2, the signals of which, after passing through the test gas mixture, are received by receiver 3. Unit 5, measured by velocity, measures the velocity of ultrasonic vibrations in the gas mixture. When the piston 6 is moved in the test chamber 1, the pressure in the gas mixture increases, which is measured by the pressure gauge 7. Together with the change in pressure during the adiabatic compression of the mixture under study, the temperature increases, the rate of change of which is unambiguously related to pressure. For gases, this relationship is expressed by the equation. Van der Waals

R

RT and V-b V

vshish

Order 1624/42

Production.-polygraph, pre-e, Uzhgorod, st. Design, 4 where P - pressure;

T is the temperature; V is the volume; a, b- van der Waals constants,

determined experimentally.

The temperature, the same at all points, changes following the pressure change with the speed of sound, i.e. The output to the operating mode of measurement is in the order of 1.6-10 ° C for the dimensions of the measuring chamber I in the order of 0.5 m. The measured parameters of pressure and velocity of ultrasonic vibrations determine the temperature and concentration of the components of the gas mixture using the calibration dependencies. The final amount of pressure change is preselected.

on the basis of the conditions of necessary accuracy, the requirements of the safety technique and the conditions of existence of the mixture itself, which is caused by the possibility of undesirable chemical reactions leading to decomposition or combination of the components of the mixture, i.e. change the object itself.

. The invention improves the accuracy and performance of the determined concentration of the components of binary gas mixtures.

Claims (1)

Formulaisobase reteni The method for determining the concentration of components of binary gas mixtures, that is, ultrasound vibrations are excited in the gas mixture under study, the gas mixture is heated, and the ultrasonic vibration velocity is measured, which determines the concentration of the components of the binary gas mixture, which, in order to broaden the field of application and increase the accuracy, the heating of the binary the mixture is produced by its adiabatic compression, the pressure of the mixture is measured, and the temperature and concentration are determined by the measured parameters taking into account the calibration dependence components of the binary mixture of gases.  Circulation 777 Subscription