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The angle of fiber optic bending has been optimized to obtain the highest sensitivity and accuracy of blood glucose level sensor. The bending angle was varied between 0 ∘ (straight sensor) and 180∘ (u-shaped sensor) with a step of 30∘ . The fiber optic was used to guide light from red diode laser source (λ=650 nm) to a photodiode detector. Interactions of evanescent wave and glucose molecules in urine were enhanced by partial removing of fiber optic cladding. The length of fiber optic cladding removal was varied between 1 – 5 cm with a step of 1 cm. The difference in evanescent wave penetration depth as bending angle and cladding removal influences the sensitivity and the accuracy of the designed sensor. The highest sensitivity of 0,37 mV/(mg/dL) was obtained for sensor bending angle of 180∘ and the length of cladding removal of 3 cm. The sensitivity increases with the fiber optic bending angle. The designed sensors show measurement accuracy well above 90%. Clarke error grid analysis indicates that all of the measured data lie within the area of small error meaning that the developed blood glucose sensor is accurate and reliable.     Keywords: blood glucose sensor, bending angle, evanescent wave, sensitivity, accuracy

Optimization of Bending Angle of Fiber Optic Sensor for Non-Invasive Blood Glucose Measurement