Force sensing resistor can be defined as a special type of resistor whose resistance can be varied by varying the force or pressure applied to it. The FSR sensor technology was invented & patented by Franklin Eventoff in 1977. The FSR sensors are made of a conductive polymer which has a property of changing its resistance based on the force applied to its surface. Hence, these are termed as FSR sensors, the force-sensing resistor is a combination of resistor and sensor technology.
The force sensing resistor is generally supplied as a polymer sheet or ink which is applied as screen printing. Both the electrically conducting and non-conducting particles are present in this sensing film. These particles are generally sub-micrometer sizes which are formulated for reducing the temperature dependence and also for improving mechanical properties, increasing surface durability.
Force sensing resistors are called (PTF) polymer thick film devices. The resistance of FSR sensors decreases with an increase in pressure applied to its surface.
Advantages of force sensing resistors – FSR
Highly sensitive to force
Main Disadvantages of Force Sensitive Resistor