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Static accuracy of resistive bend sensors
Summary
Resistive bend sensors show potential for measuring finger joint rotation. Uncoated sensors with specific calibration models achieved a median error of 1.7°, indicating good static accuracy for this sensing application.
Area of Science:
- Biomedical Engineering
- Sensor Technology
- Rehabilitation Engineering
Background:
- Measuring finger joint rotation is challenging due to the hand's complex degrees-of-freedom.
- Resistive bend sensors offer a low-cost, low-profile solution for motion sensing.
- Limited data exists on the static accuracy of resistive bend sensors during bending and straightening.
Purpose of the Study:
- To investigate the static accuracy of resistive bend sensors for finger joint rotation measurement.
- To evaluate different calibration models for improving sensor accuracy.
- To compare the performance of coated versus uncoated sensors.
Main Methods:
- Two-inch resistive bend sensors were subjected to controlled bending from 0° to 90° and back to 0°.
- Voltage output was recorded throughout the bending and straightening cycles.
- Five distinct calibration models were applied to the sensor data to assess accuracy.
Main Results:
- Non-monotonic behavior was observed in coated sensors with cubic and pchip models at low bend angles.
- Uncoated sensors utilizing the pchip calibration function yielded a median error of 1.7° (SD 1.7°, range 12.1°).
- Raw data from uncoated sensors also showed comparable accuracy to the pchip model.
Conclusions:
- Resistive bend sensors, particularly uncoated ones with appropriate calibration, demonstrate acceptable static accuracy for finger joint rotation sensing.
- Careful model selection is crucial, as some calibration methods can introduce errors, especially with coated sensors.
- Further research into sensor characterization is warranted for reliable application in hand motion analysis.
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