Investigation of noncontact fast-scanning internal-temperature measurement using a thermopile-infrared point detector

One of the important and vital parameters in clinical applications is the human body's core temperature. This study proposed a noncontact method using an infrared (IR) point detector to measure a thermal object's internal temperature. An IR point detector constructed using a pinhole and a thermopile detects IR light only at the point located in imaging relation within a thermal object. This study introduced the 2D fast-scanning system to reduce a thermal filament image's capturing time inside a miniature bulb. Although the thermopile's response time could not follow the high-speed changes in IR intensity, the filament's helical structure was disclosed in the condition of low background noise, resulting in decreased thermal images' contrast and positional shifts of the measured filament.