Photoplethysmography uses which type of light to measure heart rate on a wearable device?
Recent technological advances have made it possible to build wearable products that can capture and process bio-signals generated by the human body. When it comes to heart rate monitoring, two primary technologies are available to device manufacturers: ECG and PPG. Show If you’re deciding whether ECG or PPG could help you create the next big wearable device, to help you assess which technology is best for your application, this post defines each type of sensor and offers an overview of their respective capabilities. ECG & PPG Sensors Defined
Comparison Questions: ECG vs PPG Sensors
When it comes to key considerations like size, power consumption, accuracy, ease of integration and richness of data, ECG biosensors present a clear advantage over their PPG counterparts for heart rate monitoring. ECG biosensors are capable of delivering the widest range of heart health metrics because they are able to capture more comprehensive signals of overall heart performance, including both Heart Rate (HR) and Heart Rate Variability (HRV). In contrast, PPG sensors are capable only of measuring HR, and less reliably than with ECG biosensors. The key challenges with PPG technology are cancelling the effects of ambient light, accommodating different skin conditions and colors, and dealing with physical motion artifacts. Additionally, PPG can only be used on parts of the body that have a high concentration of blood vessels (for example, it can be difficult to get a good PPG signal from the wrist). To learn more about how ECG and PPG sensors compare for heart rate monitoring, download the free Comparison Chart: Electrical (ECG) vs. Light-based (PPG)Biosensors in Wearable Devices now. How does Photoplethysmography measure heart rate?Photoplethysmography (PPG) is an uncomplicated and inexpensive optical measurement method that is often used for heart rate monitoring purposes. PPG is a non-invasive technology that uses a light source and a photodetector at the surface of skin to measure the volumetric variations of blood circulation.
How does a Photoplethysmography pulse oximeter device work?The PPG sensor optically detects changes in the pulsatile blood-flow volume (i. e., changes in the detected light intensity) in the microvascular tissue bed based on the intensity of reflected and transmitted light.
How does a PPG signal measure heart rate?Heart rate is calculated by counting the number of systolic peaks per minute. Figure 6 shows the systolic peaks and peak-to-peak interval of a PPG signal measured by the NeXus-10 MKII device in the dry environment.
What is the difference between pulse oximetry and Photoplethysmography?A photoplethysmograph (PPG) is a plethysmograph that uses optical techniques. A pulse oximeter measures oxygen saturation level (SpO2) and is also a PPG. It can measure the change in the volume of arterial blood with each pulse beat.
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