SENSOR DEVELOPMENT FOR HEMOGLOBIN CONCENTRATION MEASUREMENT BASED ON PHOLOPLETHYSMOGRAPHY

• Main Author: DEWANTORO (NIM: 13214065), PUTUT
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/30054
• Institution: Institut Teknologi Bandung

Anemia is a condition when the number of red blood cells in the body is not enough <br /> <br /> to meet the needs of the body. In general, measurement of hemoglobin in the blood <br /> <br /> is done by taking blood samples invasively. In this final project, a device called <br /> <br /> Hemocare was created. Hemocare was a non-invasive device for measuring the <br /> <br /> hemoglobin concentration as a main component of red blood cell in the body. This <br /> <br /> device used photoplethysmography (PPG) method. The method was used to obtain <br /> <br /> the difference in the volume of blood that flows by using optical sensors. The <br /> <br /> acquired PPG raw signal required a signal conditioning circuit to obtain a good <br /> <br /> quality signal. In this final project, a signal conditioner in the form of filter and <br /> <br /> amplifier for the PPG signal was designed and tested. After initial conditioning the <br /> <br /> signal went through an ADC on microcontroller, which also made the calculation <br /> <br /> to get hemoglobin concentration. The calculation results were displayed through <br /> <br /> the display screen and sent to a smartphone via bluetooth. The implementation of <br /> <br /> the sensor used 4 lights with different wavelengths to obtain the PPG signal. This <br /> <br /> final project used wavelengths of 450nm, 515nm, 620nm and 940nm as a sensor. <br /> <br /> Based on the testing process, the filter circuit worked on a range from 0.6 to 4.8nm, <br /> <br /> while the gain of the amplifier worked on a range between 0 to 2000 times, which <br /> <br /> can be adjusted by potentiometer. The PPG signal can be acquired well by using a <br /> <br /> sampling frequency of 50Hz for each wavelength.