Shchelkanova Evgeniia, Shchelkanov Alexander, Shchapova Liia, Shibata Tomohiro
Annu Int Conf IEEE Eng Med Biol Soc. 2020 Jul;2020:4414-4420. doi: 10.1109/EMBC44109.2020.9175745.
Reflectance photoplethysmography is a widely employed method in personal health assessment devices. We developed a remote PPG system for obtaining the signal from palm skin. For the handle-mounted design, it is crucial to ensure accurate measurements under a range of skin temperatures. Under lower temperatures, green PPG was proven to provide superior signal quality in comparison to infrared PPG. However, since hemoglobin has maximum absorption in both green and blue parts of the spectrum, to ensure a stable performance of handle-mounted PPG system under different temperature conditions, it is worth exploring the PPG signal in both wavelengths. In our PPG system, TCS3472 Color Sensor was chosen as a photodetector. In distinction from video cameras with Bayer pattern, the TCS3472 has an equal number of R, G, and B sensing elements, thereby allowing the comparison of these wavelengths performance. Using the developed system, we compared green and blue PPG signals from six subjects in terms of amplitude and accuracy of heartbeat intervals estimation under two temperature conditions. According to our preliminary results, the performance of blue PPG was comparable to green PPG under both temperature conditions, suggesting further investigation with our system is worth conducting.
反射式光电容积脉搏波描记法是个人健康评估设备中广泛采用的一种方法。我们开发了一种用于从手掌皮肤获取信号的远程光电容积脉搏波（PPG）系统。对于手柄式设计，确保在一系列皮肤温度下进行准确测量至关重要。在较低温度下，与红外PPG相比，绿色PPG被证明能提供更好的信号质量。然而，由于血红蛋白在光谱的绿色和蓝色部分都有最大吸收，为了确保手柄式PPG系统在不同温度条件下的稳定性能，探索两种波长下的PPG信号是值得的。在我们的PPG系统中，选择了TCS3472颜色传感器作为光电探测器。与具有拜耳图案的摄像机不同，TCS3472具有相等数量的红、绿和蓝传感元件，从而可以比较这些波长的性能。使用所开发的系统，我们比较了六个受试者在两种温度条件下绿色和蓝色PPG信号在心跳间隔估计的幅度和准确性方面的情况。根据我们的初步结果，在两种温度条件下蓝色PPG的性能与绿色PPG相当，这表明值得用我们的系统进行进一步研究。
