Abstract
A catheter-mounted fiber optic pressure sensor is described. The sensor consists of a looped fiber; light is coupled into one leg and detected at the other. When the loop bends, microbending in the neck of the loop couples light out of the fiber, resulting in a detectable signal. The catheter was placed in a closed-circuit pumping station in parallel with a strain gauge pressure transducer; the fiber sensor simulated the transducer's output with good fidelity. Aging tests indicate remarkably good reproducibility and stability.
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