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Optopalatograph: real-time feedback of tongue movement in 3D

In this paper the latest prototype Optopalatograph (OPG) is described and its operation is demonstrated graphically and in comparison to theoretical predictions. The system is divided into three parts the optopalate itself; a separate self contained unit composed of 16 switched infra-red light sources, associated control logic and 16 receivers; and a computer with A/D card running software to analyse and interpret graphically the sensor outputs. The current prototype measures distances of up to 20mm between all of the 16 pre-selected points on the hard palate and the surface of the tongue at a frame rate of 100Hz. We conclude that the new prototype provides a practical measurement system with a subjectively informative real-time display but further development is required in order to obtain objective accuracy.