Application and Development of Photoelectric Sensor in Smart Wearable Devices

With the rapid development of technology, there has been an increasing number of smart devices in people's lives, such as smartphones, tablets, and smartwatches. Alongside the growing awareness of personal health, there is a greater demand for understanding one's own health status. However, specialized medical monitoring equipment is often bulky, limiting the mobility of the individuals being monitored. Additionally, the complexity of the data generated by such devices makes it difficult for non-medical professionals to interpret the information it reflects. In this context, smart wearable devices have emerged as a popular solution, with one of their main sensors being the photoplethysmography (PPG) sensor. This article will first introduce the detection principles of the PPG sensor and how to measure and analyze the data it provides. It will then discuss the current development status of PPG sensors in various industries. Finally, it will address the limitations of existing PPG sensors and propose future improvement directions. The research presented in this article contributes to the study and application of PPG sensors.