| Summary: | 碩士 === 國立中興大學 === 機械工程學系所 === 100 === This study develops a non-invasive infrared optical blood glucose sensor. The advantages of the sensor are against painless, fast response and low cost. The infrared optical blood glucose sensor consists of infrared light diodes, a finger hold, a photodetector and an amplifier circuit. The working principle of the sensor describes as follows. A human puts a finger into the finger hold, and the infrared diodes provide an infrared light into the finger skin. The glucose in the human blood absorbs a specific infrared wavelength, and irradiated an infrared power to the photodetector. Then, the photodetector transfers the infrared power into a current. The amplifier circuit is utilized to converts the output current of photodetector into an output voltage. In order to increase the testing stability, the finger hold was fabricated to avoid ambient light interference, and it was made from the polymer. The infrared diodes supplied an infrared light of 970 nm, and the responsivity of the photodetector was about 0.58 A/W at 970 nm. The simulated results showed that the output voltage of the sensor changed from 1.42 to 1.52 V as the blood glucose increased from 90 to 180 mg/dL. The work has completely assembled the infrared optical blood glucose sensor. The experimental results depicted that the output voltage of the sensor varied from 1.43 to 1.54 as the blood glucose increased from 90 to 180 mg/dL, and the results was approached the simulated results.
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