Artificial sense of touch

Obviously, reproducing the human sense of touch with an artificial system is a very challenging task, primarily, because the term touch is actually the combined term for several senses. Research and development on tactile sensing has experienced an impressive growth in the last three decades, and several kinds of materials and techniques have been proposed. The tentative specifications for tactile sensors have been defined [54] as  

The sensor surface or its covering should be both robust and durable. 

The sensor should provide stable and repeatable output signals. Loading and unloading hysteresis should be minimal. 

Linearity is important, while a monotonic response is absolutely necessary. 

Some degree of nonlinearity can be corrected through signal processing. 

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