The overall objective of this project is to design, build and deploy in the field an intrinsic fiber optic sensor system for subsurface CO₂ plume migration monitoring and above-zone leak detection. Intelligent Optical Systems will develop field-deployable intrinsic optic sensors with wireless communication capability, conduct sensor evaluation and demonstration in simulated subsurface conditions, and demonstrate subsurface sensor deployment and operation. Intelligent Optical Systems plans to deploy and demonstrate the sensor system in a 5,200 ft. deep well and demonstrate the feasibility of using the system to detect actual injection of CO₂ at hydrostatic pressures up to 2,000 psi. It is anticipated that the system will be mature enough at the end of the project to be incorporated in monitoring wells in the injection projects planned for Phase III of the DOE Carbon Sequestration Program.