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Compact TDLAS based sensor design using interband cascade lasers for mid-IR trace gas sensing.

Lei Dong, Frank K Tittel, Chunguang Li

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Area of Science:

Optical Engineering
Gas Sensing Technology
Spectroscopy

Background:

Tunable diode laser absorption spectroscopy (TDLAS) is a powerful technique for gas detection.
Mid-infrared (mid-IR) gas detection is crucial for environmental monitoring and industrial applications.
Compact and low-power sensors are needed for widespread deployment of TDLAS systems.

Purpose of the Study:

To develop compact TDLAS sensor systems for mid-IR gas detection.
To achieve high detection sensitivity and low power consumption.
To integrate gallium antimonide (GaSb)-based interband cascade lasers (ICLs) with compact multipass gas cells (MPGCs).

Main Methods:

Development of two distinct optical core designs for TDLAS sensors.
Integration of GaSb-based ICLs with MPGCs.
Performance evaluation of sensor systems for methane (CH4) and ethane (C2H6) detection.

Main Results:

Two compact TDLAS sensor systems were successfully developed.
Minimum detection limits of approximately 5 ppbv for CH4 and 8 ppbv for C2H6 were achieved.
The developed sensors exhibit low power consumption, around 3.7 W.

Conclusions:

The developed compact TDLAS sensors offer high sensitivity for mid-IR gas detection.
The integration of ICLs and MPGCs is effective for creating efficient gas sensing systems.
These sensors represent a significant advancement for portable and low-power gas analysis.