| Abstract | The performance of two laser-based instruments for carbon dioxide (CO2) monitoring was tested during
a controlled release experiment performed at the zero emissions research and technology (ZERT) controlled
release facility. The first instrument measures path-integrated CO2 concentrations above ground
in two orthogonal directions using a continuous-wave, temperature-tunable, distributed feedback (DFB)
diode laser with a center wavelength of 2.003m. The second instrument also uses a continuous-wave
temperature-tunable DFB laser to deliver light via fiber optics to three underground sensors. Two underground
sensors utilize absorption cells of 0.3 and 1m lengths that are buried 1m apart approximate
0.75m above the underground release pipe. The third underground sensor utilizes a photonic bandgap
(PBG) fiber as part of a fiber optic sensor. A 0.3 tCO2/day controlled release was conducted from July 9 to
August 7, 2008. The two instruments were able to distinguish the elevated CO2concentration associated
with the CO2injection.
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