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The FlexiForce single element force sensor acts as a force sensing resistor in an electrical circuit. The resistance can be read by connecting a multimeter to the outer two pins, then applying a force to the sensing area.
The FlexiForce A201 force sensor is an ultra-thin, flexible printed circuit. The force sensors are constructed of two layers of substrate (polyester/polyimide) film. On each layer, a conductive material (silver) is applied, followed by a layer of pressure-sensitive ink. Adhebstrate together to form the force sensor. The active sensing area is defined by the silver circle on top of the pressure-sensitive ink. Silver extends from the sensing area to the connectors at the other end of the sensor, forming the conductive leather end of the sensor, forming the conductive leads. A201 sensors are terminated with male square pins, allowing them to be easily incorporated into a circuit. The two outer pins of the connector are active and the center pin is inactive.
FlexiForce is reknowned for its versatility, ease of integration, and cost-effectiveness. Depending on the needs of the application, users can trim the sensors to the length of their choosing.
FlexiForce sensors are pliable enough to allow for non-intrusive measurement. They can be attached to many surfaces, and can be combined with plastic or metal films for increased stiffness or for added protection from abrasion.
The FlexiForce single element force sensor acts as a force sensing resistor in an electrical circuit. When the force sensor is unloaded, its resistance is very high. When a force is applied to the sensor, this resistance decreases. The resistance can be read by connecting a multimeter to the outer two pins, then applying a force to the sensing area. In the image below, the plot shows both the Force vs. resistance and Force vs. conductance (1/R). Note that the conductance curve is linear, and therefore useful in calibration.
One way to integrate the A201 force sensor into an application is to incorporate it into a force-to-voltage circuit. A means of calibration must then be established to convert the output into the appropriate engineering units. Depending on the setup, an adjustment could then be done to increase or decrease the sensitivity of the force sensor. The chart below shows a typical sensor response.
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