Magnetomotive drive and detection of clamped-clamped mechanical resonators in water

TL;DR

This paper demonstrates magnetomotive drive and detection of clamped-clamped mechanical resonators in water, enabling simultaneous sensing in viscous fluids without complex alignment, with results matching optical measurements.

Contribution

It introduces a magnetomotive detection scheme for water-based resonators, allowing simultaneous drive and detection without alignment, suitable for viscous fluid environments.

Findings

Successful detection of fundamental and higher flexural modes in water.

Good agreement between magnetomotive and optical measurements.

Potential for multi-sensor operation in viscous fluids.

Abstract

We demonstrate magnetomotive drive and detection of doubly clamped string resonators in water. A compact 1.9 T permanent magnet is used to detect the fundamental and higher flexural modes of $\mathrm{200 \mu m}$ long resonators. Good agreement is found between the magnetomotive measurements and optical measurements performed on the same resonator. The magnetomotive detection scheme can be used to simultaneously drive and detect multiple sensors or scanning probes in viscous fluids without alignment of detector beams.