研究目的
To find the optimal LIBS formulations and configurations for analyzing soil particles, mainly Nitrogen particles.
研究成果
With the Nd-YAG Q-Smart 850 Laser model, the formulation, configuration, and optimal use of LIBS to obtain maximum soil plasma is carried out by photographing laser pulses to soil pellets in a 5.75 torr pressurized vacuum using a wavelength of 532 nm, pulse duration 5.5 ns, 10 Hz repetition rate, 150 μs Q-switch delay and 15 mJ/pulse energy.
研究不足
The detection limit is a function of plasma excitation temperature, light collecting window, and the strength of the transition line visible. The pressure in the sample room should approach the vacuum, but making a vacuum sample room of 3 Torr takes quite a long time.
1：Experimental Design and Method Selection:
The study uses LIBS method for real-time analysis of Nitrogen particles in soil. The optimization was done through laser pulse shooting to a pellet-shaped soil sample within a pressurized vacuum chamber.
2：Sample Selection and Data Sources:
Soil samples were shaped into pellets with diameter and thickness of 3.2 cm and 0.5 cm respectively, using a manual hydraulic press with a pressure of 29.272 Mpa.
3：2 cm and 5 cm respectively, using a manual hydraulic press with a pressure of 272 Mpa.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Nd-YAG Q-Smart 850 Laser model, manual hydraulic press, vacuum chamber.
4：Experimental Procedures and Operational Workflow:
Laser pulses were fired on soil pellets in a pressurized space using a wavelength of 532 nm, a pulse duration of 5.5 ns, a repetition rate of 10 Hz with a focal length of 10 cm.
5：5 ns, a repetition rate of 10 Hz with a focal length of 10 cm.
Data Analysis Methods:
5. Data Analysis Methods: The plasma containing information about soil elements was concentrated in the lens collector by measuring light intensity in the wavelength range of 190 nm - 1000 nm.
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