A Fluidic-Based High-Pressure Sensor Interrogated by Microwave Fabry–Perot Interferometry

A fluidic-based sensor is proposed and demonstrated for high-pressure measurement. The sensor consists of a reservoir and a capillary outlet. The reservoir deforms under pressure manifesting the liquid level change in the capillary. Utilizing the built-in waveguide on the capillary, the liquid level is measured by microwave Fabry-Perot interferometry in the spectral domain. The applied pressure va...