94-1 05.02 0778
Sensing and Perception
Presently man/machine interfaces. from virtual reality
simulators to robotics applications, rely primarily on position
information with a very limited number of strain sensors.
Measurement of both the position and magnitude of an applied
force over large areas is useful but beyond the capability. Or
existing, low cost sensor systems.
The proposed sensor array represents such a system. Sensors and
leads are fabricated on a large flexible sheet with the leads
arranged in columns and rows. A novel type of strain sensor,
located at each intersection, consists of a piezoelectric film
bonded to a magnetrostrictive film. The strain at any location
is measured by addressing, a row of elements with a current
pulse. This produces a voltage pulse from the piezoelectric film
that is the output on the column lines and whose amplitude is
modulated by the local strain.
The total cost should be low and the system can easily be
applied to various surfaces, making the entire approach
compatible with low cost fabrication/assembly. The phase I
program will fabricate and measure such an array.
An integral system able to sense pressure as a function of
position over a large area has applications in robotics for
controlling the applied force. in virtual simulation for
accurately applying a resisting force and in advanced
manufacturing to provide detailed measurements of the local
Unionville, Pa. 19375