In this paper we propose a novel sensor measuring tongue motions and apply it to a pronunciation learning system. It is said that Chinese is difficult because its' pronunciation varies in subtle based on the tongue positions. Therefore it will be helpful if we can confirm the tongue's position on our learning of the pronunciation. Our proposal is a sensor to measure the position of tongue by three pieces of optical fiber. Two of them are connected with LD and LED, and the other receives the reflected light. The position is measured by the ratio of the two reflected lights. After examining the sensor's performance, we equip it on a human head and measure a series of tongue positions while Chinese is spoken.
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