Journal of Sensors / 2009 / Article / Fig 7

Research Article

Remote System for Detection of Low-Levels of Methane Based on Photonic Crystal Fibres and Wavelength Modulation Spectroscopy

Figure 7

Absorption line of an acetylene gas cell (a) and amplitude of the output signals at the dithering frequency (b) and at double of this frequency (c).
398403.fig.007

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