Japan developed the use of LED to measure heartbeat and pulse technology

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Recently, the method of measuring heartbeat and pulse using LED has been adopted by Japanese universities and Toyota. In this method, a light-emitting module using an LED and a light-receiving module using a phototransistor are disposed in a portion where a finger or the like is touched, and hemoglobin in blood is easily absorbed by light of a specific wavelength such as green, and the finger is illuminated by the LED. Reflect light to detect the pulse.
This method is widely used. In June 2013, Nippon Wireless began selling a universal pulse sensor that integrates green LEDs and phototransistors in one package.
Nihon University said that the "phase shift method" technology developed by the university's tail stock professor was used in combination with the method of measuring pulse by LED. Japanese universities did not disclose specific mechanisms, but Professor Tail said that "the phase shift method can greatly improve the signal-to-noise ratio, so you can get a very accurate pulse waveform. Because of this, the pulse can be converted into blood pressure."
Professor Tail has recently successfully integrated the core part of the data processing with phase shifting on a chip. He said that the chip size is currently 1cm2 square, but "the miniaturization of several mm squares has already been seen. It is installed in a portable terminal, so it is expected to realize the way to measure the pulse and blood pressure with a smart phone using the LED used as a flash. The University of Japan intends to launch the chip in cooperation with its partners in 2013.

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