![]() As the penetration depth of the light depends on its wavelength, green and yellow LEDs are most suitable to take measurements in the superficial blood flow and are typically used in reflection mode. PPG sensors can be used either in reflection or in transmission mode. In this blog, we will explore how to implement a human skin tissue model in OpticStudio and how to simulate the measured signal of a PPG device over time using a ZOS-API application. Therefore, the pulsation of blood causes a variation of the opposite phase in the signal of the detector. Light is more strongly absorbed and scattered by blood than by the surrounding tissue. They provide a simple optical technique to detect blood volume changes in tissues. PPG devices consist of infrared or visible range light-emitting diodes (LEDs) and photodetectors. This blog post demonstrates how to model the human skin in OpticStudio for physiological measurements and illustrates a time-dependent simulation of PPG-based heart rate sensors using ZOS-API. ![]() One of its most widespread applications is the wearable heart rate sensor included in commercially available smartwatches and sports bracelets, that provides comfortable and continuous pulse monitoring during everyday tasks. Photoplethysmography (PPG) is a low-cost, non-invasive optical technology that takes physiological measurements on the surface of the skin. ![]()
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