A CMOS Wearable Infrared Light Intensity Digital Converter for Monitoring Unplanned Self-Extubation of Patients

TLDR: In this paper, a complementary metal oxide semiconductor wearable infrared (IR) light intensity digital converter was proposed for monitoring the unplanned self-extubation of patients. But the proposed converter could process the IR light intensity without limitations of the field of view and is immune to ambient optical noise.

Abstract: This paper proposes a complementary metal oxide semiconductor wearable infrared (IR) light intensity digital converter for monitoring the unplanned self-extubation of patients. The proposed converter could process the IR light intensity without limitations of the field-of-view and is immune to ambient optical noise. Furthermore, the output of the proposed converter can be easily transmitted to Internet of things devices. The sensing area of a monolithic photodiode was $120 \times 120\,\,\mu \text{m}^{2}$ , and the complete size of the chip was $1.21 \times 2.04\,\,\text {mm}^{2}$ . The measured distance between an IR light source and the proposed converter was 15–29 cm, and the measured signal-to-noise-distortion ratio was corresponding to 80.9–74.9 dB. Finally, an experiment was conducted for monitoring the unplanned self-extubation of patients. The results indicate that the proposed chip is suitable for usage in medical institutions.