The LED light is used to measure the heartbeat and pulse in Japan

The method of making use of LED to measure heartbeat and pulse was adopted by the Japanese universities and Toyota. As shown below, this method is configured to use the LED light module and the light-receiving module such as the phototransistor in part of the finger touch, taking advantage of the hemoglobin in blood to absorb green, etc specific wavelengths of light, using the LED to irradiate the finger to detect the pulse by using the reflected light. This method is used widely, New Japan Radio was in June 2013 began to sell the common pulse sensor that. integrated the green LED and the phototransistor in a package

In addition, Nihon University, said the combination of  "phase shift" technique developed by the university professors was in method of use of LED pulse measurement. Japanese university did not disclose details of the mechanism, but the tail stock professor stressed that "the use of phase shift method can significantly improve the signal to noise ratio, it is possible to obtain very high precision pulse waveform which is why to convert the pulse to blood pressure."

 

Calculated the Blood pressure rate based on the pulse, Japanese universities and Toyota developed their own products

Since introduced in the MEDICA2012 exhibited ，other companies have an advisory on the phase shift method around the world. Professor tail stocks recently successfully integrated the core part containing data processing of the phase shift method on a chip, he said, the chip size is currently 1cm2 square, but "several mm square miniaturization has also been taking shape. Then be able to mounted to the portable terminal, it is expected to achieve that the smart phones is equipped with the flash LED, using a smart phone to measure pulse and blood pressure way. "Japan University intends to work with partners to launch the chip in 2013.

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