chanelink logo
CHANELINK
日本語

Enhanced laser heterodyne spectroscopy contributes to the measurement of atmospheric greenhouse gases

481
2023-10-25 15:48:05
翻訳を見る

The research team led by Professor Gao Xiaoming of the Chinese Academy of Sciences Hefei Institute of Physical Sciences has improved the measurement accuracy of atmospheric greenhouse gases by using erbium-doped fiber amplifier assisted laser heterodyne radiometer.

The study was published in the Journal of Optics and was selected as an editor's selection.

LHR is renowned for its high sensitivity and spectral resolution, and has become the next generation of lightweight satellite payloads. However, during the scanning process, signals measured by heterodyne radiometers often encounter issues such as reduced baseline slope and signal-to-noise ratio, which can affect measurement accuracy.

In this study, researchers developed a near-infrared laser heterodyne spectroscopy detection scheme based on EDFA.
By adjusting the EDFA for automatic power control, researchers successfully amplified and stabilized the power of the local oscillator DFB laser, thereby significantly reducing baseline fluctuations. This optimization significantly improves the accuracy of the processed atmospheric transmission spectrum.

By using EDFA with automatic power locking function, the LHR can be operated in a state dominated by shot noise during scanning. By eliminating errors caused by baseline slope, EDFA assisted LHR significantly improves its performance.

"This optimization enables LHR to operate in a state dominated by shot noise during the scanning process, "said team member Dr. Li Jun.

In the experimental measurement of atmospheric CO, EDFA assisted LHR was used for the transmission spectrum, and the signal-to-noise ratio of the heterodyne signal was increased by three times.

"These results demonstrate the effectiveness of EDFA assisted LHR in achieving higher accuracy and precision in atmospheric gas measurement, "Dr. Li said.

The team stated that this discovery can improve ground level LHR remote sensing and enhance greenhouse gas knowledge and monitoring.

関連のおすすめ

  • Nat. Commun.: Two color orthogonal polarized organic light-emitting diode

    In recent years, linearly polarized organic light-emitting diodes have greatly enriched the application scenarios of polarization optics and optoelectronics industries. The low-cost and large-area preparation of linearly polarized organic light-emitting diodes with high polarization, strong directional emission, narrow bandwidth, and multi-color adjustability is an important challenge in the curre...

    2024-02-29
    翻訳を見る

  • American scientists use light technology to control hypersonic jet engines

    According to the website "interesting engineering" on July 29th, a new study funded by the National Aeronautics and Space Administration (NASA) has revealed for the first time that the airflow in supersonic combustion jet engines can be controlled through optical sensors. This study was conducted by researchers from the School of Engineering and Applied Sciences at the University of Virginia.When ...

    2024-07-31
    翻訳を見る

  • Scientists demonstrate powerful UV-visible infrared full-spectrum laser

    Figure: a. Schematic diagram of the HCF-LN-CPPLN experimental setup. W. CaF? Window M, mirror.b. The bright white light circular spots emitted by the CPPLN sample.c. The first-order diffraction beam of B displays a colorful rainbow pattern from purple to red.d. The HCF-LN-CPPLN module generates normalized spectra of the output full spectrum laser signal through the second NL HHG and third NL SPM e...

    2023-08-25
    翻訳を見る

  • Amada launches latest precision laser welding workstation wl-300a

    Recently, Amada weld tech Inc., a Japanese supplier of welding and cutting solutions, grandly launched a new wl-300a precision laser welding workstation, which is equipped with advanced continuous wave (CW) or quasi continuous wave (QCW) fiber lasers. It has a wide range of applications, especially for metal welding and processing of selected plastic materials, especially in the aerospace field.Wl...

    2024-05-31
    翻訳を見る

  • An optical display technology based on mechanical optical mechanism

    The optical properties of afterglow luminescent particles in mechanical quenching and mechanical luminescence have aroused great interest in various technological applications. However, for specific photon applications, clearer explanations are needed for these unusual events.Recently, scientists from Pohang University of Science and Technology have designed an optical display technology with ALP ...

    2024-03-12
    翻訳を見る