異なる光強度の連続2パルス光を光源とする光吸収法による低濃度有機ガス濃度測定

概要

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We propose a measuring method for low-concentration gas using two different power pulses for deducing of the noise level derived from spectroscopic systems including a light-emitting diode (LED) and an amplifier. After two-different pulse currents were applied to a LED, and the pulsed light beams emitted by the LED were passed through to a long-path gas cell with a multi-reflectional mirror, (path length, 105 cm). The pulse was divided into reference and sample beams. Each reference beam (I_<01>, I_<02>) and sample beam (I_1, I_2) obtained from two different power pulses were subtracted as (I_<01>-I_<02>) and (I_1-I_2), respectively. By using these two values, the sample concentration was estimated by using the Lambert-Beer law. Acetone gas was used as a test sample gas. Acetone gases of 0∿90, 60∿900 ppm concentration were measured with the present method. By calculating these signals differece, the electric noise in this apparatus was canceled, and we could measure low-concentration gas. The proposed method gave good calibration curves.
社団法人日本分析化学会の論文
2005-05-05