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We proposed a new type of tactile sensor that is capable of determining thesurface morphology of skin lesions. The sensor consists of a brass cylinderwith an axial bore. Three peripheral bobbins were machined in the cylinderaround which three coils have been wound. An iron core can easily move insidethe bore. One of the coils acts as primary and the other two are secondarycoils. Change in the position of the core due to surface peaks and valleyscauses the induced voltage in the secondary coils to vary. This change in thevoltage is a measure of core position and reveals the morphological features ofthe surface (surface profile). Experiments show that the proposed sensor iscapable of discriminating between the models of two different types of skinlesions, namely, anetoderma and nodule, which resemble each other in visualinspection but behave differently when being touched. Thus, this sensor couldbe used as an assist device for diagnosis purposes in teledermatology systems.

A Tactile Sensor for Detection of Skin Surface Morphology and its Application in Telemedicine Systems