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Pressure Gauges

Pressure Gauges

Most pressure gauges, like those on scuba tanks, are calibrated to read zero at atmospheric pressure. Readings from such gauges are called the gauge pressure, which is the pressure relative to atmospheric pressure. When the pressure inside the tank exceeds atmospheric pressure, the gauge reports a positive value. Some gauges are designed to measure negative pressure. For example, many physics experiments must take place in a vacuum chamber, a rigid chamber from which some of the air is pumped...

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Related Experiment Video

Updated: Jun 30, 2026

Strain Sensing Based on Multiscale Composite Materials Reinforced with Graphene Nanoplatelets

Strain Sensing Based on Multiscale Composite Materials Reinforced with Graphene Nanoplatelets

Published on: November 7, 2016

High-Sensitivity Graphene MOEMS Resonant Pressure Sensor.

Yujian Liu¹, Cheng Li^1,2, Xiaodong Shi³

¹School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing 100191, China.

ACS Applied Materials & Interfaces

|June 12, 2023

Summary

This summary is machine-generated.

This study introduces a novel graphene resonant pressure sensor that significantly reduces energy loss and prevents gas leakage. The new design offers enhanced sensitivity and stability for advanced pressure sensing applications.

Keywords:

MOEMS graphene pressure sensing resonators vacuum sealing

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Published on: March 24, 2023

Area of Science:

Materials Science
Nanotechnology
Sensor Technology

Background:

Graphene nanomechanical resonators offer high pressure sensitivity but suffer from energy loss and gas leakage in non-vacuum environments.
Existing designs face challenges with air damping and material permeation, limiting long-term stability and performance.

Purpose of the Study:

To develop a new graphene resonant pressure sensor with improved stability and reduced energy loss.
To overcome the limitations of gas permeation and air damping in graphene-based pressure sensors.

Main Methods:

Utilized micro-opto-electro-mechanical systems (MOEMS) technology with a multilayer graphene membrane sealed in vacuum.
Employed an indirectly sensitive method, adhering graphene to a grooved, pressure-sensitive silicon film.
Integrated an all-optical encapsulating cavity structure.

Main Results:

Achieved 60 times lower energy loss in atmospheric conditions compared to conventional designs.
Demonstrated a high pressure sensitivity of 1.7 Hz/Pa, five times greater than silicon counterparts.
Obtained a high signal-to-noise ratio (6.9 × 10^-5 Pa^-1) and low temperature drift (0.014%/°C).

Conclusions:

The proposed graphene resonant pressure sensor effectively suppresses energy loss and prevents gas permeation.
This innovative approach provides a promising solution for stable, high-performance pressure sensing using 2D materials.
The sensor's enhanced sensitivity and stability make it suitable for demanding applications.