Technical implementation and metrological characteristics of the ultrasonic express gas analyzer

Purpose of the work. To evaluate the influence of the shape of a complex electrical signal at the input of a piezoelectric transducer on the duration of the acoustic signal emitted by it. Materials and methods. Theoretical modeling using the d'Alembert method for a one-sided loaded piezoelectric plate was used. Results. The paper shows the relevance of the task of controlling the composition of the gas medium. The possibility of using ultrasound to monitor changes in the composition of the air environment is analyzed. The necessary accuracy of measuring the velocity of ultrasonic waves has been estimated. It is shown that in order to identify the maximum permissible concentrations of most dangerous gases, it is necessary to measure the ultrasound velocity with an error of at least 0.1 %. The influence of ambient temperature is estimated and the need for temperature correction is shown. A method is proposed to ensure the necessary accuracy and speed. A working layout has been developed and manufactured. The above experiments confirmed the possibility of constructing an ultrasound gas analyzer. Conclusion. Studies have been conducted that have shown the possibility of using such a parameter as changing the speed of ultrasound to determine dangerous concentrations of harmful substances in the air. This possibility was confirmed by the test results of the developed and manufactured ultrasonic gas analyzer sample.

Authors: D. A. Ottych, M. M. Shevelko

Direction: Physics

Keywords: gas analyzer, speed of sound, ultrasonic method, development of a gas analyzer, influence of temperature

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