Abstract
Although GC/MS(Gas Chromatograph/Mass Spectrum) method is often used to analyze gases, a rapid and low-cost method is required. Since a gas detector tube is well known as a simple measurement method, we focused on it to perform bad-smell sensing for monitoring living environment. We developed a simple system for automatically and continuously measuring color change of the gas detector tube. It is originally a disposable one for manually measuring the gas concentration only once at a certain time. The developed system enables the real-time measurement of the gas concentration change and the reduction of the read-out error. In the present study, we proposed the method for eliminating the influence of the noise to determine the boundary of the color-change region. The measurements of methyl mercaptan and hydrogen sulfide were reproducibly performed under the humidity-rich environment using the proposed method.
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