Scuba diving is a pleasant marine activity, but it is not without danger as diving is not a natural human activity. As a means of improving diver healthcare, we investigated the feasibility of measuring pulse waves inside a diver's mouth by using a photoelectric sensor mounted on the mouthpiece used by a diver for underwater breathing. Testing showed that the pulse waves can be measured at the gum. The results also showed that the measurement is easier when there is little or no pressure between the sensor and gum.
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