Flow sensing by buckling monitoring of electrothermally actuated double-clamped micro beams

TL;DR

This paper introduces a novel flow sensing method using buckling monitoring of electrothermally actuated micro beams, demonstrating its effectiveness through experiments and modeling for flow velocity detection.

Contribution

The study presents a new flow sensing technique based on buckling deflections of micro beams influenced by convective cooling, supported by a coupled thermoelectric, thermofluidic, and structural model.

Findings

Deflection sensitivity of 1.5 microns/(m/s)

Critical current sensitivity of 0.4 mA/(m/s)

Experimental results align with the reduced order model

Abstract

We report on a flow sensing approach based on deflection monitoring of micro beams buckled by the compressive thermal stress due to electrothermal Joules heating. The air stream convectively cooling the device affects both the critical buckling values of the electric current and the postbuckling deflections of the structure. After calibration, the flow velocity was obtained from the deflections measurements. The quasi-static responses of 2000 microns long, 10 microns wide and 30 microns high single crystal silicon beam transduced using image processing were consistent with the prediction of the reduced order model, which couples thermoelectric, thermofluidic and structural domains. The deflection sensitivity of 1.5 microns/(m/s) and the critical current sensitivity of 0.4 mA/(m/s) were registered in the experiments. Our model and experimental results collectively demonstrate feasibility of the sensing approach and further suggest that simple, robust and potentially downscalable beam-type devices may have use in flow velocity and wall shear stress sensors.