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SoundSpeed_2025

July 17, 2024, 5:32 p.m. Likes: 0

The objective of this project is to design an app in App Inventor 2 that allows the identification of refrigerant gases by making measurements of the speed of sound of these gases.

For this purpose, a 3D-printed resonance cell was built, equipped with a proximity sensor controlled with an Arduino microprocessor.

The device thus constituted allows field measurements to be made without the need for a computer

Credit: 

- Icon designed by Freepik; downloaded from www.flaticon.

More Info: 

The speed of sound in a ideal gas is related to two characteristics of the gaseous substance, its molecular mass in kg/mol and its adiabatic constant (heat capacity ratio), or its average values in case of being a mixture of gases.

It is for this reason that the measurement of the speed of sound can be used as a preliminary way to identify a pure gas or mixture of gaseous substances.

The measurement can be performed using an ultrasonic proximity sensor, to measure the round trip time ( t/2 ) of a sonic pulse in a tube of known length ( x ) (echo method ), filled with the gas under study ( v = 2x/t ).

References:

Measuring Refrigerant Gases Sound Speed Using Arduino and App Inventor 2

Resonance Cell for Measuring the Speed of Sound in Gaseous Substances by Aewolframio - Thingiverse

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