2007•Journal of Hubei Institute for NationalitiesRequires access

Detection of Indoor Air Quality Based on DOAS Technique

Yang Chun-yong

Abstract

Based on the principle of differential optical absorption spectrometry(DOAS),a set of detecting instrument for indoor air quality is proposed.In the system,a tunable dioxide laser is used as a sensor source,and the method of wavelength modulated is adopted,then concentration of gas is determined through detecting the generated second harmonic by opto-electronics converter.An optical transmission system including several concave mirrors is designed to improve the sensitivity of measurement by extending the optical path for measurement.

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Key concepts: Differential optical absorption spectroscopy, Sensitivity (control systems), Optical path, Transmission (telecommunications), Optics, Wavelength, Absorption (acoustics), Materials science