One-Dimensional Position Detection Using a Cable Piezoelectric Sensor

Area of Science:

• Materials Science
• Electrical Engineering
• Sensor Technology

Background:

• Existing sensors often lack flexibility and wide-area sensing capabilities.
• Accurate force application point identification is crucial for various monitoring applications.

Purpose of the Study:

• To establish a novel sensor structure and readout circuit for precise force application point identification in a single cable piezoelectric sensor.
• To enable wide-area sensing through a highly flexible, continuously formable sensor.

Main Methods:

• Designed a cable piezoelectric sensor with a high-resistance central electrode.
• Utilized charge amplifiers connected to both ends to measure divided charge.
• Predicted force application point using a normalized ratio of measured charges and a smoothing-spline calibration model.

Main Results:

• Successfully verified the principle using a five-segment cable with discrete resistors.
• Achieved a root mean square error of 25 mm in predicting the point of force application for the developed cable sensor.
• Demonstrated the sensor's capability for wide-area sensing due to its flexible and continuous form.

Conclusions:

• The developed piezoelectric cable sensor effectively identifies the point of force application.
• The high-resistance central electrode and dual charge amplifier readout enable accurate, wide-area force sensing.
• This technology offers a promising solution for flexible and precise force monitoring.