Life Sensing Technology in Helo
Principle of PPG Photoplethysmography (PPG) is an optical technique used to detect volumetric changes in blood in peripheral circulation. It is a non-invasive method that makes measurements at the surface of the skin. The technique provides valuable information related to our cardiovascular system.PPG makes uses of low-intensity infrared (IR) light. When light travels through biological tissues it is absorbed by bones, skin pigments and both venous and arterial blood. Since light is more strongly absorbed by blood than the surrounding tissues, the changes in blood flow can be detected by PPG sensors as changes in the intensity of light.The voltage signal from PPG is proportional to the quantity of blood flowing through the blood vessels. Even small changes in blood volume can be detected using this method, though it cannot be used to quantify the amount of blood.A PPG signal has several components including volumetric changes in arterial blood which is associated with cardiac activity, variations in venous blood volume which modulates the PPG signal, a DC component showing the tissues’ optical property and subtle energy changes in the body. The PPG technology is used for measuring oxygen saturation, blood pressure and cardiac output, assessing autonomic function and also detecting peripheral vascular disease.
The Internet of Things (IoT)The Internet of Things (IoT) is a system of interrelated computing devices, mechanical and digital machines, objects, animals or people that are provided with unique identifiers and the ability to transfer data over a network without requiring human-to-human or human-to-computer interaction.A thing, in the Internet of Things, can be a person with a heart monitor implant, a farm animal with a bio-chip transponder, an automobile that has built-in sensors to alert the driver when tire pressure is low — or any other natural or man-made object that can be assigned an IP address and provided with the ability to transfer data over a network. A full IoT device is a next-generation device capable of incorporate in itself all the elements needed for communication of data, media, and position through the Internet, like a screen, WiFi connection or GPS monitoring.