A new technique for the measurement of the concentration of gas species is presented. The method is based on absorption spectroscopy in the infrared region utilizing a high-power broad band amplified spontaneous emission source from an optical fibre. Vibrational bands of CO2 gas in the range 1.9-2.1 μm were measured and the relative intensities of bands were calibrated in terms of concentration. The amplified spontaneous emission from a Tm+3/Ho+3 co-doped silica fibre pumped near 800 nm was used as a light source that consisted of the 3H4 → 3H6 transition of the Tm+3 ion and the 5I7 → 5I8 transition of the Ho+3 ion with a full width at half maximum of 225 nm and total output power over 1 mW. The technique has potential for the simultaneous detection of multiple gas species due to its high spectral energy density over a wide wavelength band in the infrared where the vibrational overtones of gas molecules are located.
All Science Journal Classification (ASJC) codes
- Engineering (miscellaneous)
- Applied Mathematics