Tiếng Việt

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

800
2023-10-25 15:48:05
Xem bản dịch

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.

Đề xuất liên quan
  • Natural Communication: Oxide Dispersion Enhancement for High Performance 3D Printing of Pure Copper

    The laser additive manufacturing technology of pure copper (Cu) with complex geometric shapes has opened up vast opportunities for the development of microelectronic and telecommunications functional devices. However, laser forming of high-density pure copper remains a challenge.Recently, the forefront of additive manufacturing technology has noticed a joint report by the University of Hong Kong, ...

    04-11
    Xem bản dịch
  • Launching the world's strongest laser at a cost of 320 million euros

    Beijing, April 1st (Reporter Liu Xia) - The world's most powerful laser has been activated recently. On March 31st, the Physicist Organization Network reported that the system can enable laser pulses to reach a peak of 10 terawatts (1 terawatt=100 terawatts=1015 watts) within 1 femtosecond (1000 trillions of a second), which is expected to promote revolutionary progress in multiple fi...

    2024-04-03
    Xem bản dịch
  • The University of Stuttgart has simplified the detection of nanoplastics

    Detecting the presence of nanoscale plastic particles in the environment has become a topic of concern for industrial societies worldwide, not least since particles of that size can evade the body's blood-brain barrier and damage metabolic processes.Optical technologies have been at the forefront of these monitoring efforts. Recent examples have included the use of stimulated Raman scattering to s...

    09-15
    Xem bản dịch
  • Artists transform paper into meticulous laser cutting designs

    In the past few years, paper artists have demonstrated the versatility of their common fiber materials. Some people manually cut or carve paper, while others combine traditional craftsmanship with digital design. Ibbini Studio is in this situation. Abu Dhabi artist Julia Ibni collaborated with computer scientist Stephen Noye to create sculptural paper works inspired by decorative patterns such as ...

    2024-01-23
    Xem bản dịch
  • Progress has been made in the research of phase modulation of terahertz programmable metasurfaces based on free carrier plasmonic dispersion effect

    Recently, the team of Situ Guohai and Guo Jinying from the Aerospace Laser Technology and Systems Department of the Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, and the School of Microelectronics at Shanghai University collaborated to propose a terahertz phase controlled programmable metasurface design scheme based on free carrier plasma dispersion effect. The rela...

    2024-07-26
    Xem bản dịch