Composite Gas Measurement System using NDIR Method

서지정보

· 발행기관 : 한국산학기술학회
· 수록지 정보 : 한국산학기술학회논문지 / 19권 / 3호 / 624 ~ 629페이지
· 저자명 : 어익수

초록

The current study was conducted to develop a portable composite gas detector allowing the detection of both CO2 and CH4 gases by means of the Non Dispersive Infra-Red (NDIR) method. The gas detector is configured to radiate infrared waves using infrared lamps, where the wavelength of the infrared light is reduced due to absorption throughout the chamber, and this reduction (absorption) is detected by the absorption detector, before being converted and amplified to a 3.5V～6V electrical signal, providing as accurate a measurement as possible. The conventional singe sensor method measures the relative measurement by absorbing only specified wavelengths of infrared radiation, which in the case of gas detection leads to problems with accuracy due to the lack of a reference sensor when detecting light with a wavelength of only 4.26㎛. The dual sensor employed in this study provides a comparative measurement between the reference value derived from the wavelength of 3.91㎛, which is not influenced by other gas sources, and the measurement value derived from the wavelength of 4.26㎛, in order to reduce the errors and enhance the reliability, thereby allowing low power consumption for portable devices and multi-gas detection for both CO2 and CH4 gases. The portable composite gas detector developed herein provides a measurement rage of 0ppm～5,000ppm for CO2 gas, and 0.5%vol for CH4, which allows the determination of whether the CO2 and CH4 contents in indoor air are less than 1,000ppm or not. The current study established that the composite gas detector can be interlinked with firefighting appliances through portable devices or home automation, and is anticipated to be very effective in fire prevention.

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