Essay On Photoplethysmography

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Objectives and Motivations: Our objectives of the term paper projects are to explore a survey research on recent developments using photonic technology. Optical Heart rate monitoring (OHRM) was chosen to be our project topic. The application of Photoplethysmography (PPG) technology would be discussed. Introduction Heart Rate is determined by the number of times beats in one minute. It is difficult to measure accurately and the most important physiological parameters reflecting our body condition. Continuous or routine measurement of heart rate become essential once patients were suffering from any diseases. Analysis of heart rate would help to maintain and monitor health, diagnose and detect coronary diseases. Thus, heart rate becomes an important indicator for recognizing the functionality of heart, also be an indicator of health and disease. There widely use non-invasive methods for measuring heart rate: by the traditional method, is measured by doctor that feel and count the pulse of the pulsating arterial blood in suitable parts of our body such as wrist and …show more content…

The principle of PPG sensors is the optical detection of blood volume changes in the neurovascular bed of the tissue. It contains two main optical devices, such as a light source and an optical light detector. In the past, red and Infrared (IR) light-emitting diodes (LEDs) were commonly used as the light source. The main function of the PPG sensor was monitoring the changes in the light intensity via reflection from or transmission through our tissue. This changes in terms of light intensity are associated with small variations in blood perfusion of the tissue and provide information on the cardiovascular system, especially the pulse rate of our body. Light pass through the biological tissue, it can be absorbed by different substances, such as pigments in the skin, bone and venous

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