Aplikasi Sistem Sensor Fiber Bragg Grating Untuk Pendeteksian Simulasi Denyut Jantung

Abstract

Heart rate detection still widely develops one to human behavior, so that efforts are regnired to investigrate other ways to more easily detect it. Currently, heart detection can be done without medical ceek up, such as using cellphones, watches, and others. Fiber Bragg Grating (FBG) can be used to detect the heart rate, in the form of pressure which causes a change in strain. FBG also has high sensitivity to strain. Heart rate detection can be measured in several ways such as using a telescope, but FBG has a high level of accuracy. This study aims to design and measure changes in the output power of the FBG and analyze the effect of strain changes on the FBG by loudspeaker vibration. 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 output power change at 1310 nm Bragg wavelength is 0.736 µW, while at 1550 nm wavelength it is 0.009 µW. The highest Bragg wavelength shift is at the Bragg 1310 nm wavelength of 0.598 nm, while at the Bragg 1550 nm wavelength it is 0.552 nm. The highest strain change at the Bragg 1310 nm wavelength is 576,186 µε, while at the Bragg 1550 nm wavelength it is 432,113 µε. This shows that the response at the Bragg 1310 nm wavelength is more sensitive than the Bragg 1550 nm wavelength.