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Tensile Force Measurement

FSR sensors fundamentally measure compressive force (pressing force). However, with proper jig structure design, tensile force (pulling force) can also be measured.

Measurement Principle​

Limitations of Direct Measurement​

FSR sensors operate on the principle that resistance changes when the resistive material between two electrodes is compressed. Therefore, pulling force cannot be measured directly.

Indirect Measurement Method​

A structure that converts pulling force into pressing force is used.

Conversion Principle:

Tensile Force → Jig Structure → Compressive Force → FSR Sensor

Jig Design Example​

Tensile force measurement jig

A structure where pulling one side of a lever causes the other side to press the sensor.

Use Cases​

Grip Detection​

  • Measuring the force of pulling a handle
  • Door handles, levers, handlebars, etc.
  • Verifying safety device activation

Precautions​

  • Indirect measurement: Since tensile force is not measured directly, errors may occur
  • Jig precision: Jig manufacturing precision directly affects measurement accuracy
  • Friction/Wear: Friction and wear of moving parts affect measured values
  • Calibration: Calibration of the entire system including the jig is required
  • Limited application: Dedicated load cells are recommended for precise tensile force measurement