Non Uniform Geometry Bend Sensors Exploited for Biomedical Systems

In biomedical systems the bend sensors have been increasingly used stands their interesting properties useful to measure human joint static and dynamic postures. These commercially available sensors are usually made of a polyester film printed on with a special carbon ink. The film acts as a support while the ink’s resistance value changes with bending dues to an applied external force. The substrate film material is usually made by Kapton and/or Mylar for their properties, stands the fact that substrate must be able to bend repeatedly without failure for the sensor to work. In spite of their interesting properties the commercial bend sensors have a resistance vs. bent angle characteristic which is not actually ideal as a linear function, to measure human postures, would be. So we introduce here a novel solution useful to linearize the sensor response.