US 12,066,549 B1
Same-path and synchronous detection system and method for atmosphere data
Chenbo Xie, Hefei (CN); Yalin Hu, Hefei (CN); Hui Zhou, Hefei (CN); Hao Yang, Hefei (CN); Liangliang Cheng, Hefei (CN); Wenyue Zhu, Hefei (CN); and Yingjian Wang, Hefei (CN)
Assigned to Hefel Institutes of Physical Science, Chinese Academy of Sciences, Hefei (CN)
Filed by Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei (CN)
Filed on May 1, 2024, as Appl. No. 18/652,664.
Application 18/652,664 is a continuation of application No. PCT/CN2023/140617, filed on Dec. 21, 2023.
Claims priority of application No. 202310988646.4 (CN), filed on Aug. 8, 2023.
Int. Cl. G01S 17/00 (2020.01); G01S 7/481 (2006.01); G01S 17/58 (2006.01); G01S 17/95 (2006.01)
CPC G01S 17/95 (2013.01) [G01S 7/4815 (2013.01); G01S 7/4816 (2013.01); G01S 7/4817 (2013.01); G01S 17/58 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A same-path and synchronous detection system for atmosphere data, wherein
the detection system comprises an emission unit, a receiving unit and a data processing unit;
the emission unit comprises multiple sets of laser devices, which are used for emitting the laser of different wavelengths in a synchronous and same-path manner;
the receiving unit comprises a receiving telescope, which is symmetrically provided with a plurality of pupils, to receive an echo signal after the laser of different wavelengths interacts with the atmosphere;
the data processing unit is configured to calculate atmosphere data parameters through the echo signal;
the laser devices comprise a first laser device and a second laser device;
the first laser device is fixed above the receiving telescope, to emit lasers of a first fundamental frequency of a first setting wavelength and a corresponding doubled frequency in a synchronous and same-path manner, and a front end of the first laser device is sequentially provided with a total reflector and a beam expander;
the whole second laser device is mounted below the receiving telescope, to emit the laser of a second fundamental frequency of a second setting wavelength with the first laser device in a synchronous and collimation manner;
the data processing unit comprises an atmospheric transmittance detection channel, an atmospheric coherence length detection channel and an atmospheric wind field detection channel;
the atmospheric transmittance detection channel comprises a first avalanche photo diode (APD) detector and a first data collector, the first APD detector is configured to convert a back scattering space optical signal, generated after the interaction of the first fundamental frequency laser with atmospheric molecules and aerosol particles, into an electrical signal, and the first data collector is configured to collect the electrical signal;
the atmospheric coherence length detection channel comprises a reflector, a second optical filter and a second intensified charge coupled device (ICCD) detector, the reflector and the second optical filter are configured to transmit the received echo signal to a target surface of the second ICCD detector, and the second ICCD detector is configured to convert the echo signal into a digital signal; and
the atmospheric wind field detection channel comprises a circulator, an optical fiber coupler, a balance detector and a second data collector, the circulator is configured to output the echo signal to the optical fiber coupler, the optical fiber coupler is configured to perform beam splitting after the echo signal is in beat frequency with another circuit of local oscillator light, the balance detector is configured to convert the optical signal into the electrical signal, and the second data collector is configured to convert the electrical signal into the digital signal.