1：Experimental Design and Method Selection:

The study involved the development of a high repetition rate tunable mid-infrared DIAL system for long-range remote detection of gas plumes. The system uses a solid-state tunable optical parametric oscillator laser with a repetition rate of 500 Hz and a wavelength range of 2.5 μm to 4 μm. A monitoring channel was used to record laser energy in real-time for signal correction. Convolution correction technology was incorporated for laser wavelength selection.

2：5 μm to 4 μm. A monitoring channel was used to record laser energy in real-time for signal correction. Convolution correction technology was incorporated for laser wavelength selection. Sample Selection and Data Sources:

2. Sample Selection and Data Sources: NO2 and SO2 were used as examples for system calibration and open field observation experiments. The experiments involved measuring the concentration of these gases in controlled and open environments.

3：List of Experimental Equipment and Materials:

The system included a 1064 nm Nd: YAG laser, PPLN crystals for wavelength tuning, a 300 mm Newton reflecting telescope for signal acquisition, and a VIGO mid-infrared detector.

4：Experimental Procedures and Operational Workflow:

The calibration experiment used a gas cell to simulate gas absorption paths, while the open field observation involved releasing standard gases into the environment and measuring their concentration changes over time.

5：Data Analysis Methods:

The study used convolution correction for wavelength selection and signal correction. The concentration of gases was calculated based on differential absorption signals and compared with theoretical values.