Abstract
Tools to measure pulse and blood SpO2 have been made using thin-film barium strontium titanate (BST) as the sensor. There are three phases in designing a prototype for measuring the pulse and SpO2. The first is constructing and profiling the optical and electrical characteristics of thin-film BST. From the optical characteristic profiling, it was discovered that there are three wave peaks that are absorbed the most by the film: 450, 600–640, and 900 nm. From the electrical characteristic profiling, it was discovered that the film produced is classified as a photodiode with two sensitivities: exp(–0.0018)/lux when illuminated by white light and exp(–0.0429)/lux when illuminated by infrared light. The second is designing the electronic circuit which consists of an amplifier circuit, filter, and a minimum Atmega328P-PU microcontroller system. From the tests that had been conducted, each circuit succeeded in processing the signal as expected. The third, testing the SpO2 on 20 patients using the prototype and a standard model Elitech Fox-1 oximeter as the reference tool. The results that were recorded demonstrated that the accuracy of the prototype in measuring the SpO2 reached 98% in comparison to the reference tool.
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