Physics Lecturer Develops Heart Rate Detector from Fiber Optic Sensor Thursday, 09 March 2017 03:05

Prof. Dr. M. Yasin, M.Si., in his laboratory. (Photo: Faridah Hari)

UNAIR NEWS – His interest to mechanics, quantum and light was started when he was in senior high school. With his attention directed to Physics, he became a professor acknowledged at national and global level.

In between of  his busy schedule as the Head of Physics bachelor program coordinator, Prof. Dr. M. Yasin, M.Si. keeps conducting researches and publishing them. Last February 6, Yasin was awarded as a lecturer with most publications in Universitas Airlangga.

In 2016, he has published 16 researches at international journals indexed by Scopus. It is in line with the efforts made by the university and the government.

His researching career started when he was doing his doctoral program in Universitas Gadjah Mada in 2006. Since then, he has focused on his researches and he also has a strategic research partner. He collaborates with researchers from Photonics Research Centre in Universitas Malaya. In that research center, he also collaborated with researchers from Glasgow University, Southampton, Aalto, Herrior-Watt, University College London, Bangkok, Australian National University, and Northwest University Xi An. Beside in Malaya, he also established partnership with Universiti Teknologi Malaysia. For Yasin, partnership research is the important part of publishing every month.

His first publication was in 2008 and a year after that, he succeeded in publishing nine researches.

“There were 9 papers, but they couldn’t bring a promotion. It’s fine as there is an opportunity to be a visiting professor. At the same time, we can save some for buying equipments here (UNAIR) with some fund allocated by Dikti year by year. With good equipments we can start our own publications,” said Yasin during interview in Faculty of Science and Technology (FST) UNAIR.

Yasin has published 52 researches. What has pushed him so far to publish his researches? For him, conducting researches and publications is like drinking coffee. “Publications for me is like drinking coffee. It causes addiction,” said Yasin.

His researches are in Biophotonics, Laser optics, Fiber optics and Endoscopy. He is interested in studying photonics especially when it interacts with some material.

“It is interesting especially when it interacts with certain material. Photonic reactions are reflection, refraction, divergence. With interaction between light nad material, for example when the light is shot or reflected, we can detect the reaction by observing the light reflected,” said Yasin.

Heart rate Detection

His latest research was just published in Optics journal mid-January 2017. In his paper, Yasin and two other UNAIR researchers, Prof. Dr. Retna Apsari and Yhosep Gita Yhun Yuwana, S.Si., M.T., wrote “Fiber Optic Sensor for Heart Rate Detection”. This research has only needed 26 days to pass all article submission process, revision until it was published.

Yasin developed an electric activity detection method made by the heart through laser beam and fiber optic sensor. This fiber optic functions as laser propagation. Fiber optic is attached with an instrument called  bundle probe which is used to check out a wound or body parts. The instrument is directed to an object covered by glass.


During research, Yasin and his team used loudspeaker to replace the real heart rate. The laser is transmitted through fiber to the loudspeaker managed by the audio amplifier. The signal from the loudspeaker then reflected through glass and received by the fiber. The sound signal then converted to electrical signal and the result of the activity is observed through oscilloscope.

“The object is shot and shown through oscilloscope. It can be used for organ endoscopy,” said Yasin. “The fiber functions to propagate the light. It reacts when there is a sound signal. The changes are detected and measured,” said the awardee of Emerald Publisher from the category of Highly Recommended Paper Award in 2013.

We usually check the patient’s heart rate using a device called electrocardiogram (ECG). With this developed method by Yasin, the patient does not have to be attached to a device as laser just need to be shot. The other advantage is the electrical activity is measured with better precision. Its accuracy is similar to the light wavelength at nanometer.

At the moment, Yasin and his team keeps developing the research. In his advanced research, he will try to optimize the signal sensory system with microbending.

“So, the fiber is straight, when we apply pressure, it bends. The bending will cause different light intensity. The changes will be studied in more detailed. Does the heart rate will follow the fiber shift? Then it can be applied to human,” added the outstanding lecturer in 2013.

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