METHOD AND DEVICE FOR MEASURING CONCENTRATION OF GAS, CAPABLE OF INDICATING LOW RELATIVE STANDARD DEVIATION EVEN IF CONCENTRATION AND THE NUMBER OF REPEATING INCREASE

摘要

PURPOSE: Method and device for measuring concentration of gas are provided to remove gas from a sensor by first injecting scentless air before injecting gas to be measured.;CONSTITUTION: A method of measuring concentration of gas comprises next steps. Gas to be measured is injected into a gas sensor(130). Scentless air is injected before injecting the gas to be measured. Time to inject the scentless air is longer than that to inject the gas to be measured. While the gas to be measured is injected, output voltages of both ends of a load resistor or the inner resistance of the gas sensor is measured to obtain an output graph over time. The load resistor is serially connected to the gas sensor. The adsorption of the gas is calculated from the output graph. The concentration of the gas is extracted using the calculated adsorption.;COPYRIGHT KIPO 2011