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An optical device has been developed for recording and processing of biomedical signal using transmission mode of optical plethysmography technique. The data aquisition process is carried out based on detection of the near-infrared light absorbance in blood vessels of fingertip due to heart’s pump activity. The microcontroller was used as main component to provide the operation of electronics module and communication to personal computer through Universial Serial Bus (USB) system. In addition, the USB port was also used as part of power supply device, so that requiring no the external power adaptor. The analogue signal of photosensor (photodiode) was fed to microcontroller for digitalization process and then was transferred to a software for storage, processing and display of the biomedical signal on the personel computer. Performance of the developed device was tested to record the biomedical signal data of three fingertips of healthly volunteers. The testing results have shown that the developed device could successfully perform recording, analysis, and storage of biomedical data. Further, the recorded biomedical signals were processed by the software for filtering (removal noise) and extraction of spectrum signal using Fast Fourier Transform (FFT) function in the developed software. The results of FFT spectrum have shown that the dominan peaks in range 1 1.5 Hz according to the normal frequency of human heartbeat. Therefore, this device can potentially be developed as a simple, low power, computerized and portable device for importance of biomedical research and clinical practices. Keywords— Computerized, Optical Plethysmography, Processing and Recording Data, Biomedical Signal

Computerized Optical Plethysmography for Data Recording and Processing of Biomedical Signal