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Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing

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Published on: March 22, 2019

Optically multiplexed multi-gas detection using quantum cascade laser photoacoustic spectroscopy.

Anadi Mukherjee¹, Manu Prasanna, Michael Lane

¹Pranalytica, Inc., 1101 Colorado Avenue, Santa Monica, California 90401, USA.

|September 23, 2008

Summary

This study demonstrates a new optical multiplexing technique for rapid, high-sensitivity detection of multiple trace gases. The method enables simultaneous sensing of ammonia, nitrogen dioxide, and nerve agent simulants for comprehensive environmental monitoring.

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Area of Science:

Analytical Chemistry
Spectroscopy
Environmental Science

Background:

Accurate and rapid detection of multiple trace gases is crucial for environmental monitoring and safety applications.
Existing multispecies gas sensors often face limitations in speed, sensitivity, or complexity.

Purpose of the Study:

To develop and demonstrate a high-throughput, nondispersive optical multiplexing technique for laser beams.
To apply this technique for sensitive, simultaneous detection of multiple trace gases using quantum cascade laser photoacoustic spectroscopy.

Main Methods:

Utilized a scanning galvanometer for high-throughput, nondispersive optical multiplexing of multiple quantum cascade lasers.
Employed photoacoustic spectroscopy for trace-gas detection.
Demonstrated rapid laser switching (<1 second) for efficient multispecies analysis.

Main Results:

Achieved high signal-to-noise ratio detection of five gaseous components: ammonia (NH3), nitrogen dioxide (NO2), dimethyl methyl phosphonate (DMMP), acetone, and ethylene glycol.
Successfully detected trace levels (parts per billion) of these gases in a complex room air mixture.
Demonstrated laser switching in under 1 second, meeting requirements for comprehensive multispecies sensing.

Conclusions:

The developed optical multiplexing technique enables rapid and sensitive multispecies trace-gas detection.
This approach is suitable for building comprehensive sensors for environmental and safety monitoring.
The system demonstrated high performance in detecting a range of critical gaseous compounds.