Abstract
This paper describes a new method of detection and measurement of fingertip slip on the surface of a manipulated object in a multi-fingered precision manipulation with rolling contact. Due to the fact that slip sensors are still in a basic research phase and no slip sensor is compatible with the actual fingertip manipulation, our method is based on the multi-sensor fusion of vision, joint-encoders of the fingers, and finger-tip force/torque sensors. Position of the contact between the object and the fingertip is computed in realtime from the measured pose of the object and the fingertip position. Slip displacement of the fingertip contact is then separated from the displacement by rolling mo-tion of the fingertip. Reliability of the slip detection from the noisy data is improved using the tangential-to-normal ratio of the measured force at the contact and the mutual relationship between the tangential force and the direction of the contact displacement. Results of the experiments show the effectiveness of the method.
