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Measurement of Fluid Pressure

Measurement of Fluid Pressure

Fluid pressure is commonly measured using devices called manometers, which rely on liquid columns to indicate pressure differences. The height of a liquid column in a manometer reflects the pressure exerted by the fluid, providing a simple yet effective means of measurement. Different types of manometers serve specific purposes based on their configurations and the type of fluids involved.
A basic form of manometer is the piezometer, a vertical tube open at the top and filled with the same...

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Updated: Nov 21, 2025

Microtensiometer for Confocal Microscopy Visualization of Dynamic Interfaces

Microtensiometer for Confocal Microscopy Visualization of Dynamic Interfaces

Published on: September 9, 2022

Distributed colorimetric interferometer for mapping the pressure distribution in a complex microfluidics network.

Xiongfeng Zhu¹, Tianxing Man, Xing Haw Marvin Tan

¹Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, Los Angeles, California, USA. peiyu@g.ucla.edu.

|January 18, 2021

Summary

This summary is machine-generated.

We developed a new platform for high-resolution pressure mapping in microfluidics. This technology enables real-time monitoring of complex fluid networks, aiding in the detection of issues like clogging and leakage.

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Area of Science:

Microfluidics
Optical Sensing
Materials Science

Background:

Microfluidic devices are crucial for various applications, but precise pressure monitoring remains a challenge.
Existing methods often lack the spatial resolution or real-time capabilities needed for complex networks.

Purpose of the Study:

To develop a novel platform for high-resolution, real-time pressure distribution mapping in complex microfluidic networks.
To enable early detection of anomalies such as clogging and leakage.

Main Methods:

Utilized colorimetric interferometers based on lossy optical resonant cavities in a silicon substrate.
Employed machine-learning-assisted sensor calibration for accurate pressure measurements.
Achieved high spatial resolution (50 μm) over a 1 cm² area.

Main Results:

Demonstrated real-time pressure detection by monitoring reflected color from optical cavities.
Generated a dynamic measurement range of 0 to 5.0 psi with 0.2 psi accuracy.
Successfully mapped pressure distributions in complex microfluidic networks.

Conclusions:

The developed platform offers a significant advancement in microfluidic monitoring.
Enables timely detection and localization of anomalies, improving device reliability.
The system's adaptable measurement range caters to diverse microfluidic applications.