Abstract
A laser diode absorption method to measure CO2 gas temperature and concentration was developed using a 2.0 μm DFB (Distributed Feed Back) laser. Optimized two absorption lines for CO2 around 5000 cm-1(2.0 μm) were selected from HITRAN 98/HITEMP database. Two sets of 2.0 μm DFB laser were fabricated in a pigtail fashion and all components were contained in a box. Special optical isolator, a single mode fiber for 2.0 μm, a fiber ring interferometer and optical filter for wavelength separator were all developed for the system. The measurement sensitivity at different sweep frequencies from 100 Hz to 10 kHz was evaluated using heated gas cell which are contained CO2 gas. The results sbowed that the system has a small error under high concentration and low temperature. Accuracy, in low concentration and high temperature show some tolerance (3.64%) because of small absorption. The comparison between HITRAN 98/HITEMP database and our experimental data were performed to establish our data source for temperature/concentration measurement.
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