研究目的
The choice of the optimum operation modes of the Raman lidar and the differential absorption and scattering lidar for the hydrogen sulfide molecules sensing in the atmosphere at the low permissible concentration level, comparison of their potential opportunities and the error estimation of the hydrogen sulfide molecules concentration measurement in the atmosphere by the Raman lidar and the differential absorption and scattering lidar at the atmospheric air pollution with the hydrogen sulfide ranging.
研究成果
The study concluded that the Raman lidar and the differential absorption and scattering lidar can be used for the hydrogen sulfide molecules sensing in the atmosphere at the low permissible concentration level with a relative accuracy in the range of 20–26%. The choice of the lidar variant for these molecules ranging monitoring depends on the studied molecules concentration level and the measurement time.
研究不足
The study is limited by the technical constraints of the lidar equipment, such as the laser radiation pulse energy, the receiving telescope mirror diameter, and the laser pulses repetition rate. The application constraints include the ranging distance and the measurement time for the hydrogen sulfide molecules concentration detection.
1：Experimental Design and Method Selection:
The study involved computer simulation of the Raman lidar and differential absorption and scattering lidar equations for hydrogen sulfide molecules sensing in the atmosphere. The theoretical models included the Raman scattering by the hydrogen sulfide molecules and differential absorption and scattering for the choice of the laser radiation wavelengths.
2：Sample Selection and Data Sources:
The study used hydrogen sulfide molecules concentration values in the range of N(z) = 1011–1015 cm–3 for the experimental situation.
3：List of Experimental Equipment and Materials:
The equipment included a YAG-Nd-laser at the wavelengths of 532, 355 and 266 nm harmonics, a Newton type receiving telescope with a spherical mirror of 0.4 m diameter, and a FSD-8 type micro spectrometer.
4：4 m diameter, and a FSD-8 type micro spectrometer.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The laser worked with the pulse repetition rate f = 10 kHz and the lidar signals were recorded by the synchronous photons counting for the studied molecules concentration low levels detection.
5：Data Analysis Methods:
The approach for analyzing experimental data included statistical techniques and software tools utilized for the computer simulation of the lidar equations.
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