Application of thin film barium strontium titanate (BST) in a microcontroller based tool to measure oxygen saturation in blood. (2nd January 2020)

• Record Type: Journal Article
• Authors: Iskandar, Johan; Jenie, Renan Prasta; Siregar, Ulfah Juniarti; Yuliarto, Brian; Irzaman,
• Is Part Of: Ferroelectrics. Volume 554(2020)
• Page Start: 134
• Page End: 143
• Publication Date: 2020-01-02
• Subjects: Barium strontium titanate -- microcontroller -- optical properties -- oxygen saturation -- photodiode; Ferroelectricity -- Periodicals; Ferroelectric crystals -- Periodicals; 537
• DOI: 10.1080/00150193.2019.1684755
• Languages: English
• ISSNs: 0015-0193

Abstract

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.