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Abstract
A Fabry–Perot based optical fiber sensor to measure the oxygen concentration through monitoring the change of refractive index in red blood cells is reported. The optical fiber sensor with a diameter of 220 μm is made entirely of fused silica glass fibers, which can be integrated within standard brachytherapy seed delivery needle to be used in vivo . Isopropanol solution and pig blood are prepared to produce refractive index in the range 1.344–1.365. Gold is coated to a thickness of 100 nm at the tip of the sensor to enhance the interaction between hemoglobin and light. A fast Fourier transform algorithm is used to analyze the phase angle from the reflected output spectrum. The gold-coated sensor has up to almost ten times higher sensitivity to hemoglobin concentration in blood solutions compared to isopropanol solutions. A sensitivity of 9.82 rad/RIU with a refractive index resolution of 2.09 × 10–3 RIU is achieved for the sensor with a 16 μm thickness diaphragm.
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