Biomedical Engineering Reference
In-Depth Information
Figure 2.1
Optical micrograph of the fabricated prototype 8
×
8 tactile sensor array [1] (
©
Elsevier)
Piezoresistors
4cm
Figure 2.2
Tactile sensor without the rubber surface [3] (©
Elsevier)
exhibiting an independent, linear response to the three components of forces applied on the
cells. With neural-network training, the tactile sensor produces reliable three-dimensional
force measurements and repeatable response on tactile images. Another study describes
the development of a new type of tactile sensor which is designed to operate with a
PZT element employed as the sensor [4]. Most researchers have attempted to design
tactile sensors with a number of discrete sensing elements arranged in a matrix form [5].
The main problem with this type of design is crosstalk [6]. Although the force is actually
exerted on a single element of the matrix, any undesirable response from adjacent sensing
elements can cause a measurement error. In cases where polyvinylidene fluoride (PVDF)
