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Related Experiment Video

Updated: Jun 17, 2026

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

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Published on: March 22, 2019

Coherence-multiplexed FMCW spectroscopy for long-distance multi-point gas sensing.

Ning Xu, Xiutao Lou, Baosen Tian

|June 15, 2026

Summary

This summary is machine-generated.

We developed a novel long-range gas-sensing technique using coherence multiplexing with optical frequency-modulated continuous-wave (FMCW) spectroscopy. This method significantly extends sensing distances for distributed gas monitoring applications.

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Area of Science:

Optoelectronics
Spectroscopy
Environmental Monitoring

Background:

Traditional spectroscopic gas sensing faces limitations in range and spatial resolution.
Distributed sensing requires robust methods to overcome signal degradation over long distances.

Purpose of the Study:

To develop a long-range, multi-point spectroscopic gas-sensing method.
To enhance the sensing distance and spatial resolution of optical frequency-modulated continuous-wave (FMCW) spectroscopy.

Main Methods:

Incorporation of coherence multiplexing into FMCW spectroscopy.
Segmentation of the sensing region to suppress phase noise accumulation.
Segment-by-segment adjustment of optical delay for optimal coherence matching.

Main Results:

Demonstrated multi-point acetylene gas sensing over 11 km.
Achieved a minimum detectable concentration of 0.94 ppm and spatial resolution of 0.46 m.
Extended the sensing range by a factor of 60 compared to conventional methods.

Conclusions:

The proposed coherence-multiplexed FMCW spectroscopy offers a low-cost, high-capacity solution for long-distance distributed gas monitoring.
The system relaxes requirements on laser coherence, detection bandwidth, and computing power.
Potential to multiplex thousands of sensors with sufficient optical power budget.