Self-Sensing of a Magnetically Actuated Prism

Area of Science:

• Physics
• Mechanical Engineering
• Electrical Engineering

Background:

• Traditional sensing methods for magnetically actuated systems often require additional components, increasing complexity and cost.
• Integrating sensing capabilities directly into actuation mechanisms offers a more streamlined approach for feedback control.

Purpose of the Study:

• To develop a self-sensing method for a magnetically actuated prism, enabling closed-loop control without external sensors.
• To identify an optimal measurement frequency for utilizing actuation coil impedance as a sensing parameter.
• To achieve accurate determination of the prism's tilt angle.

Main Methods:

• Determined the optimal measurement frequency by balancing sensitivity to prism position and robustness against actuation frequencies.
• Developed a combined actuation and measurement driver circuit.
• Calibrated the driver's output signal against the mechanical state of the prism to correlate electrical impedance with physical position.

Main Results:

• Successfully utilized the impedance of actuation coils for self-sensing the prism's mechanical state.
• Achieved reliable measurement of each actuator's state.
• Determined the prism's tilt angle with an accuracy of ±0.1° in polar angle (±4°) and ±20 mrad in azimuthal angle.

Conclusions:

• The developed self-sensing method reliably measures the state of magnetically actuated prisms.
• This technique enables precise feedback-loop control without the need for supplementary sensors.
• The method offers a robust and accurate solution for angle measurement in relevant applications.