Investigating Design Considerations and Offsets in Body Infrared Thermometer Accuracy

Abstract

During the COVID-19 pandemic, body infrared thermometers have gained global popularity for their non-invasive, rapid temperature readings. Operating like industrial counterparts, they sense emitted radiation using optical and electrical components. Yet, their accuracy varies due to design and component quality. Many fall short of claimed precision and lack effective calibration options. Recognizing this issue, the National Metrology Institute of South Africa (NMISA) has taken the proactive step of assembling its own body infrared thermometer to investigate design factors that could impact accuracy and traceability. The initiative involves controlling the entire design process, starting from characterizing the thermopile and thermistor, determining instrument factors, and establishing accurate lookup tables for body temperature determination. This initiative aims to ensure accuracy and traceability to international standards. The research underscores the need to consider design factors and offsets, striving for a final design that allows easy recalibration, ensuring sustained accuracy and alignment with metrological standards.