The development of wearable chemical sensors is of interest to obtain comprehensive information for health promotion. However, the development of wearable sensors faces many challenges for long-term use, easy handling, response time, accuracy, validity, and reliability. There are several imitations to produce simple wearable sensors, and above these, optical gas sensors are a promising tool. Monitoring of oxygenation by pulse oximeter and components of expired gas by capnometer is a successful technology. In this section, these two sensors are reviewed including sensor principle and limitation of use.
KeywordsPulse oximeter Oxygen saturation Optical density Red and infrared wavelengths Capnometer Carbon dioxide expired gas
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