Pulse oximeters, a type of photoplethysmography (PPG) sensor, are electronic devices that measure a person’s blood-oxygen saturation (SpO 2) and heart-rate (HR) levels. Since their inception in the ...

Despite its widespread use, PPG accuracy can vary significantly across individuals, particularly by skin tone. Darker skin contains more melanin, which absorbs and scatters light, often leading to ...

Optical sensors represent the most common type of biosensor. This two-part series provides a technical background on how optical techniques are used for bioanalytical applications. This article ...

Photoplethysmography (PPG) is an optical sensing technique that measures blood volume changes and underpins devices ranging from hospital-grade pulse ...

Watches that provide heart-rate monitoring look similar look to their analog or mechanical counterparts. All of these devices have familiar watch faces and wrist bands. However, inside the digital ...

Researchers at Brown University have developed a wearable sensor that uses polarized light to improve the accuracy of ...