Application of Fiber Bragg Grating Sensor System for Simulation Detection of the Heart Rate

Abstract

Fiber Bragg grating (FBG) is also widely used to detect the heart because it can be received in the form of pressure that results in changes in strain. FBG was chosen because it has a high sensitivity to strain. Heart rate detection can be done in several ways such as using a telescope, but using FBG has a high degree of accuracy and is sensitive to strain. Heart detection is still developing because of the serious problem with human life behavior so that efforts are needed to find other ways to more easily detect the heart. Currently, heart detection can be done without having to go to the hospital, such as by using a cellphone, watch, and others. This study aims to design and measure changes in the output power of FBG and to analyze the effect of strain change on FBG by loudspeaker vibration. The Bragg wavelengths used are 1310 nm and 1550 nm with a power of 1 mW as a diode laser source and the output is measured by an optical power meter. The highest change in output power at a wavelength of 1310 nm Bragg is equal to 0.471 μW, while at a wavelength of 1550 nm it is equal to 0.032 μW. The highest shift of the Bragg wavelength is at the Bragg 1310 nm wavelength, which is 0.598 nm, while the Bragg wavelength of 1550 nm is 0.552 nm. The highest change in strain was at 1310 nm Bragg wavelength valued at 576.186 με, while at 1550 nm Bragg wavelength was 432.113 με. This shows that the response at the Bragg wavelength of 1310 nm is more sensitive than the Bragg wavelength of 1550 nm.