by Researchers led by Prof. Gao Xiaoming from the Hefei Institutes of Physical Science have made significant advancements in the measurement accuracy of atmospheric greenhouse gases, such as carbon dioxide, by utilizing an Erbium-doped Fiber Amplifier (EDFA)-assisted Laser Heterodyne Radiometer (LHR). The team’s findings were published in Optics Letters and were recognized as an Editor’s Pick.
Laser Heterodyne Radiometer (LHR) is renowned for its high sensitivity and high spectral resolution, making it a promising tool for lightweight satellite payloads. However, the signals measured by heterodyne radiometers often encounter challenges during the scanning process. Issues like baseline slope and reduced signal-to-noise ratio compromise the accuracy of these measurements.
To address these challenges, the researchers developed a detection scheme for near-infrared laser heterodyne spectroscopy based on EDFA. By implementing the EDFA for automatic power control, the team successfully amplified and stabilized the power of the local oscillator (LO) distributed feedback (DFB) laser. This resulted in a significant reduction of baseline fluctuations and a noticeable improvement in the accuracy of the processed atmospheric transmission spectrum.
Dr. Li Jun, a member of the research team, highlighted that the EDFA with an automatic power-lock function allowed the LHR to operate in the shot-noise-dominated regime during scanning. By eliminating errors caused by baseline slope, the EDFA-assisted LHR demonstrated substantial improvement in its performance.
In experimental measurements of atmospheric CO2 transmission spectra using the EDFA-assisted LHR, the heterodyne signal’s signal-to-noise ratio witnessed a remarkable threefold improvement. Dr. Li emphasized that these results confirm the effectiveness of the EDFA-assisted LHR in achieving higher accuracy and precision in atmospheric gas measurements.
The researchers believe that this discovery could revolutionize ground-based LHR remote sensing and enhance the understanding and monitoring of greenhouse gases. The optimized measurement accuracy and precision offered by the EDFA-assisted LHR hold the potential for significant advancements in our understanding of atmospheric greenhouse gases and their impact on climate change.
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1. Source: Coherent Market Insights, Public sources, Desk research
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