| 摘要 |
The present invention provides an apparatus and method for detecting components of a mixed gas which increases the detection efficiency using a sensor array in which various types of nanomaterials such as carbon nanotubes (CNT), zinc oxide (ZnO), titanium dioxide (TiO2), and tin dioxide (SnO2) which are sensitive to environment, so as to detect various components of a mixed gas using the characteristics that the effective refractive index change of the sensors induced by the gas adsorption depends on the apecies of nanomaterials and a concentration change in detected materials, thus effectively detecting the components of a mixed gas by the single detection without an inefficient education process required for conventional pattern recognition. For this purpose, the present invention provides an apparatus for detecting components of a mixed gas, in which a plurality of optical fiber sensors such as D-shaped optical fiber Bragg grating sensors, long period grating sensors, and Fabry-Perot optical fiber sensors in which nanomaterials are patterned or coated on an side or end of each optical fiber are used. In the case of the D-shaped optical fiber sensor, nanomaterials such as carbon nanotubes (CNT), zinc oxide (ZnO), titanium dioxide (TiO2), and tin dioxide (SnO2) are coated on a flat surface of a core region, thus forming an optical fiber sensor array including a plurality of optical fiber sensors formed with different nanomaterials such that the cross-section of the D-shaped optical fiber senor is oriented outwardly to be exposed to a detected material. In the case of the Fabry-Perot optical fiber sensor, nanomaterials are coated on an end of each optical fiber, thus forming an optical fiber sensor array. Moreover, the present invention provides a method for detecting components of a mixed gas, which can qualitatively and quantitatively measure a mixed gases by calculating the characteristics of a optical waveform, i.e., a wavelength shift and a change in intensity of the waveform, reflected or transmitted by a change in refractive index caused a detected material is adsorbed by the coated nanomaterials while an optical signal from a pulse laser passes through an optical fiber.
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