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High-Sensitivity TDLAS Sensors Based on Double-Helix United/Split Spot Patterns.

Haiyue Sun^1,2, Xiaorong Sun^1,2, Ying He¹

¹National Key Laboratory of Laser Spatial Information, Harbin Institute of Technology, Harbin 150001, China.

Analytical Chemistry

|July 3, 2025

Summary

This study introduces a new tunable diode laser absorption spectroscopy (TDLAS) sensor using a double-helix spot pattern for enhanced gas detection. It achieves high sensitivity for methane and dual-gas monitoring, crucial for environmental applications.

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Area of Science:

Spectroscopy
Environmental Science
Laser Technology

Background:

Tunable diode laser absorption spectroscopy (TDLAS) is vital for gas sensing.
Compact and highly sensitive TDLAS sensors are needed for real-world applications.
Multipass cells (MPCs) enhance sensitivity but can increase size.

Purpose of the Study:

To develop a highly sensitive TDLAS sensor using a novel double-helix spot pattern.
To achieve high detection sensitivity in a compact sensor structure.
To demonstrate simultaneous dual-gas detection capabilities.

Main Methods:

Designed a dense double-helix united spot pattern within a three-mirror multipass cell (MPC).
Implemented a double-helix split spot pattern for simultaneous dual-component sensing.
Utilized TDLAS for methane (CH4) and acetylene (C2H2) detection.

Main Results:

Achieved a minimum detection limit (MDL) of 122.9 ppb for CH4, reduced to 15.4 ppb with extended integration time.
Demonstrated simultaneous CH4/C2H2 monitoring with MDLs of 354.7 ppb and 111.2 ppb, improved to 35.7 ppb and 19.5 ppb respectively.
Established a highly sensitive linear relationship between signal and concentration for both gases.

Conclusions:

The double-helix spot pattern TDLAS sensor offers high sensitivity and compactness.
The sensor is suitable for environmental monitoring, including urban CH4 measurements.
The developed system enables real-time, simultaneous detection of multiple gases.