Yutao Feng

Title : Doppler Asymmetric Spatial Heterodyne Spectroscopy for the Middle Atmosphere Wind Measurement

Abstract:

A space-borne near Infrared Doppler Asymmetric Heterodyne Spectroscopy(nIR-DASH) remote sensing technique for the middle atmosphere wind field  measurement is reported.  The research progress of  passive optical remote sensing technology for wind field in middle and upper atmosphere and the principle and characteristics of DASH are introduced. For measuring the wind field in middle atmosphere, the emission spectrum in the (0-1) vibration band of O2 molecular transition is taken as the observation target source, and the system parameters of the nIR- DASH are analyzed according to the spectral radiation characteristics of the target source. The test to the prototype by laboratory calibration light source and Doppler simulation source indicate that the prototype is with   0.3cm^-1 spectral resolution,  better than 2m/s velocity inversion accuracy RMS. For stability indicators, the phase temperature drift coefficient of the interferometer after thermal compensation is XXrad/?, and the long-term phase stability of the interferometer system is better than 10mrad. This technique is provided with good application prospect in the field of wind measurement of the earth middle atmosphere.

Audience take away:

• This report provides a means to measure the wind field in the middle atmosphere which can be referenced by the audience in the field of atmospheric detection. In addition, the principles of space heterodyne spectroscopy can also be applied to other fine spectral applicationfield.
• How will this help the audience in their job? Is this research that other faculty could use to expand their research or teaching? Does this provide a practical solution to a problem that could simplify or make a designer’s job more efficient? Will it improve the accuracy of a design, or provide new information to assist in a design problem? List all other benefits.
  The near infrared Doppler heterodyne spectroscopy is a double beam isopachous interferometry, which can provide a technical reference for interferometry and Fourier transform spectroscopy. At the same time, spatial heterodyne spectroscopy is also a new interference technique, which can be used for reference in physical optics teaching. The content of the report also hasreference value to designers in the field of atmospheric measurement and fine spectral measurement. It provides a space-borne remote sensing method with higher accuracy and reliability for wind field measurement in middle atmosphere.

Biography:

Yutao Feng studied Physics at the Northeast Normal University, and graduated as Bachelor in 2004. He then joined the research group of Prof. Xiang at the State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics of Chinese Academy of Sciences, and received PhD degree in 2009 at the same institution. Then he joined the Key Laboratory of Spectral Imaging Technology, Xi’an Institute of Optics and Precision Mechanics,CAS. He has published more than 50 research articles in SCI (E) journals.