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Multiplex Chemical Imaging Based on Broadband Stimulated Raman Scattering Microscopy

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A Robust Optical Sensor for Remote Multi-Species Detection Combining Frequency-Division Multiplexing and Normalized

Wenling Jin^1,2, Hui Zhang^1,2, Mai Hu¹

¹State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China.

Sensors (Basel, Switzerland)

|February 9, 2021

Summary

A new remote sensing technique combines frequency-division multiplexing and wavelength modulation spectroscopy for robust hydrocarbon monitoring. This method achieves sub-parts-per-million sensitivity for methane and acetylene, even with significant laser fluctuations.

Keywords:

frequency-division multiplexing multi-species sensor normalized wavelength modulation spectroscopy remote sensing

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Area of Science:

Spectroscopy
Optical Sensing
Environmental Monitoring

Background:

Accurate and reliable monitoring of hazardous gases like hydrocarbons is crucial for industrial safety and environmental protection.
Existing remote sensing technologies face challenges with sensitivity, robustness to environmental fluctuations, and multi-species detection.

Purpose of the Study:

To develop and demonstrate a robust remote multi-species sensor for practical hydrocarbon monitoring.
To enhance sensitivity and immunity to laser power variations in optical gas sensing.

Main Methods:

Combined frequency-division multiplexing and normalized wavelength modulation spectroscopy.
Utilized an open-ended, centimeter-size multipass cell for interrogating gas samples.
Employed second-harmonic demodulation for enhanced sensitivity and first-harmonic normalization for power variation immunity.

Main Results:

Achieved sub-parts-per-million (sub-ppm) sensitivity for methane (CH4) and acetylene (C2H2) with a 1-second time resolution.
Demonstrated high immunity to laser intensity fluctuations (0-6 dB), with noise levels remaining within 1.38 times that of stable intensity.
Successfully separated gas samples by a 3-km fiber optic cable from the laser source.

Conclusions:

The developed spectroscopic technique offers a promising solution for robust remote monitoring of multiple hazardous gases.
The sensor exhibits high sensitivity and stability, making it suitable for practical industrial and environmental applications.
This approach addresses key limitations of current remote gas sensing technologies.