Prosthetic finger tactile sensor based on force-sensitive resistor and polyvinylidene fluoride

Abstract

The invention discloses a prosthetic finger tactile sensor based on a force-sensitive resistor and polyvinylidene fluoride. The sensor comprises a force-sensitive resistance sensor module, a polyvinylidene fluoride sensor module, a processing circuit module, a sensor base, a polydimethylsiloxane pouring hole and a joint shaft. According to the prosthetic finger tactile sensor, the characteristicsof non-uniform deformation and high sensitivity of a polyvinylidene fluoride film are utilized; the dynamic low-frequency response of the polyvinylidene fluoride film is used for dynamic contact pointestimation; high frequency response is used for texture recognition; the force-sensitive resistor is used for supplementing static measurement; the advantages of PVDF dynamic contact force measurement and the convenience of FSR in static force measurement are combined; the normal force measurement, the contact point estimation and the texture recognition can be achieved only through one sensor unit under the condition that a complex sensing array is not used; and the cost of the tactile sensor is reduced, and the performance of the tactile sensor is improved.

Description

technical field [0001] The invention relates to the technical field of biomedical sensors, in particular to a tactile sensor for artificial limb fingers based on FSR and PVDF. Background technique [0002] Prosthetic hands are widely used in clinical medicine to improve the quality of life of disabled patients. Tactile sensors provide information about interaction forces and surface properties at contact points, which are fundamental requirements for autonomous manipulation and grasping of prosthetic hands. In practical applications, tactile sensing information required for autonomous manipulation and haptic feedback includes contact force and surface properties such as texture and hardness. [0003] Currently, the development of functional and low-cost tactile sensors that can be used in prosthetic hands is still a challenge, considering the many constraints of tactile sensors (such as high spatial resolution, high sensitivity, wide frequency response, low hysteresis and m...

AI Technical Summary

Problems solved by technology

At present, the application of polyvinylidene fluoride (PVDF) films is mostly focused on the high-frequency response of texture recognition, while there are few studies on its low-frequency motion monitoring.

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