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Injection volume control of carboxy-gun using a solenoid valve

Carboxy-guns are used for rapid and precise injection of CO2 gas to the target skin area using external power source. In the design of carboxy-gun, the most important thing is how to precisely control injection volume of CO2 gas. This paper deals with the control scheme of injection volume of carboxy-gun using solenoid valve. First the amount of volume that passes through the solenoid valve under on-off time ratio control is estimated based on the assumption of compressible gas flow. The flow rate of gas is experimentally measured under the varying pressure of the gas reservoir. Two results showed good correlation to each other, thus demonstrating the validity of the volume control strategy.