Optical heterodyne detected velocity modula- tion molecular ionic spectroscopy is presented and employed to observe the rovibrantional spectra of O+2 and O-2. That the lineshape of OH-VMS is of the second derivative o...Optical heterodyne detected velocity modula- tion molecular ionic spectroscopy is presented and employed to observe the rovibrantional spectra of O+2 and O-2. That the lineshape of OH-VMS is of the second derivative of Gaussian profile and its sensitivity is 3.5×10?8 are theoreti- cally analyzed, and they are both in good agreement with our experimental results.展开更多
A 1550-nm all-fiber monostatic lidar system based on linear chirp amplitude modulation and heterodyne detection for the measurements of range and velocity is presented. The signal processing method is given, after whi...A 1550-nm all-fiber monostatic lidar system based on linear chirp amplitude modulation and heterodyne detection for the measurements of range and velocity is presented. The signal processing method is given, after which the relationship between the peak frequency values in the final signal spectrum, the target＇s range, and the line-of-sight velocity is obtained in the presence of the fiber end-face-reflected signal plaguing many monostatic lidar systems. The range of an electric fan as well as the line-of-sight fan speed of different levels is tested. This proposed system has a potential application for the space-borne landing system.展开更多
Together with the 74 lines belonging to (0,9,0)-(0,0,0) band, the high-resolution absorption spectrum ofH2O+ A2A1-X2B1 system was observed in the visibleregion of 16680-17300 cm-1 using optical heterodyne magnetic ro...Together with the 74 lines belonging to (0,9,0)-(0,0,0) band, the high-resolution absorption spectrum ofH2O+ A2A1-X2B1 system was observed in the visibleregion of 16680-17300 cm-1 using optical heterodyne magnetic rotation enhanced velocity modulation spectroscopy for the first time, which verifies the high sensitivity and high signal to noise ratio (S/N) of this technique.展开更多
文摘Optical heterodyne detected velocity modula- tion molecular ionic spectroscopy is presented and employed to observe the rovibrantional spectra of O+2 and O-2. That the lineshape of OH-VMS is of the second derivative of Gaussian profile and its sensitivity is 3.5×10?8 are theoreti- cally analyzed, and they are both in good agreement with our experimental results.
文摘A 1550-nm all-fiber monostatic lidar system based on linear chirp amplitude modulation and heterodyne detection for the measurements of range and velocity is presented. The signal processing method is given, after which the relationship between the peak frequency values in the final signal spectrum, the target＇s range, and the line-of-sight velocity is obtained in the presence of the fiber end-face-reflected signal plaguing many monostatic lidar systems. The range of an electric fan as well as the line-of-sight fan speed of different levels is tested. This proposed system has a potential application for the space-borne landing system.
基金This work was supported by the National Natural Science Foundation of China (Grant No. 19974011)and the Laboratory of Magnetic Resonance and Atomic and Molecular Physics (Grant No. 991516).
文摘Together with the 74 lines belonging to (0,9,0)-(0,0,0) band, the high-resolution absorption spectrum ofH2O+ A2A1-X2B1 system was observed in the visibleregion of 16680-17300 cm-1 using optical heterodyne magnetic rotation enhanced velocity modulation spectroscopy for the first time, which verifies the high sensitivity and high signal to noise ratio (S/N) of this technique.
