US 12,449,549 B2
Dispersion gating-based atmospheric composition measurement laser radar
Zhen Zhang, Anhui (CN); Mingjia Shangguan, Anhui (CN); Haiyun Xia, Anhui (CN); Xiankang Dou, Anhui (CN); and Xianghui Xue, Anhui (CN)
Assigned to University of Science and Technology of China, Hefei (CN)
Appl. No. 17/297,125
Filed by University of Science and Technology of China, Hefei (CN)
PCT Filed Jul. 22, 2019, PCT No. PCT/CN2019/096980
§ 371(c)(1), (2) Date May 26, 2021,
PCT Pub. No. WO2021/000359, PCT Pub. Date Jan. 7, 2021.
Claims priority of application No. 201910591972.5 (CN), filed on Jul. 2, 2019.
Prior Publication US 2022/0026577 A1, Jan. 27, 2022
Int. Cl. G01S 17/95 (2006.01); G01S 7/487 (2006.01); H01S 3/00 (2006.01); H01S 3/10 (2006.01)
CPC G01S 17/95 (2013.01) [G01S 7/4876 (2013.01); H01S 3/0057 (2013.01); H01S 3/0078 (2013.01); H01S 3/0085 (2013.01); H01S 3/10046 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A lidar for detecting atmospheric composition based on time-stretch and tailoring, comprising a femtosecond laser, a time-stretch and tailoring apparatus, a laser pulse amplifying apparatus, a laser transceiving apparatus, an atmosphere background noise filtering module, a detection apparatus, a signal receiver, and a data processing apparatus, wherein,
the femtosecond laser is configured to output a femtosecond laser pulse;
the time-stretch and tailoring apparatus is configured to perform time-stretch on the femtosecond laser pulse and tailor a spectrum of the time-stretched femtosecond laser pulse in time domain, wherein the spectrum of the time-stretched femtosecond laser pulse corresponds to a plurality of laser pulses respectively with different wavelengths in time domain, and the time-stretch and tailoring apparatus is configured to select a first target laser pulse with a predetermined wavelength from the plurality of laser pulses and output the selected first target laser pulse, wherein the predetermined wavelength is one of the different wavelengths;
the laser pulse amplifying apparatus is configured to generate a second target laser pulse by amplifying power of the first target laser pulse;
the laser transceiving apparatus is configured to transmit the second target laser pulse into the atmosphere after compressing a divergence angle of the second target laser pulse, and receive an echo signal from the atmosphere;
the atmosphere background noise filtering module is configured to process noises in the echo signal from the atmosphere;
the detection apparatus is configured to detect the echo signal from the atmosphere and output a corresponding electrical signal;
the signal receiver is configured to acquire the electrical signal; and
the data processing apparatus is configured to process the electrical signal to obtain concentration information of gaseous constituents of the atmosphere.