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Gas Chromatography: Overview of Detectors

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A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response

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CMOS-Based Gas Direction Sensors with a Surface-Integrated Pillar.

Yusuke Yodo^1,2, Kazunari Lucas Cerizza Freitas^1,2, Yoshihiro Asada²

¹National Institute of Technology (KOSEN), Nagano College, Nagano 381-8550, Japan.

Sensors (Basel, Switzerland)

|May 4, 2026

Summary

This summary is machine-generated.

This study introduces a novel single-chip gas sensor that uses a pillar to create a flow shadow for direction estimation. This method enables stable gas detection even in high-speed airflow, overcoming limitations of previous techniques.

Keywords:

CMOS gas sensor CMOS potential sensor gas direction estimation gas source localization sensor array single-chip sensor

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Area of Science:

Sensor Technology
Fluid Dynamics
Chemical Sensing

Background:

Conventional gas direction estimation requires multiple sensors, increasing complexity and bulk.
Existing CMOS gas sensors struggle with stable direction estimation in high-speed airflow.
MEMS fabrication adds complexity to current gas sensing systems.

Purpose of the Study:

To develop a streamlined, single-chip gas sensor for direction estimation.
To overcome the limitations of existing methods in high-speed airflow environments.
To enable high-precision gas detection with reduced system complexity.

Main Methods:

Integration of a pillar onto a single CMOS gas-sensor array.
Exploitation of fluid dynamics to create a gas dilution "shadow" pattern.
Experimental verification using ammonia gas under high-speed turbulent flow.

Main Results:

A distinct flow "shadow" pattern was observed as a localized reduction in sensor output.
The spatial position of the "shadow" strongly correlates with the gas inflow direction.
Stable gas direction estimation was achieved in high-speed turbulent flow.

Conclusions:

The proposed method enables single-chip gas direction estimation.
This approach is effective even in challenging, rapid-airflow environments.
The integration of a pillar offers a streamlined and effective solution for gas sensing.