Fig. 2: Working diagram of the instrument: Two high-precision GPS units are carried on the instrument to provide precise pointing (a GPS base station is required). | Nature Communications

Fig. 2: Working diagram of the instrument: Two high-precision GPS units are carried on the instrument to provide precise pointing (a GPS base station is required).

From: Ozone pollution monitoring using a full-time hyperspectral tomography system for multiple air pollutants

Fig. 2

The instrument calculates the directional difference from the UAV using its onboard GPS, providing a coarse tracking signal (The physical diagram see Supplementary Fig. 10). a is a schematic diagram of the principle of the precisely aligned optical path. Fine adjustments are made using a dichroic beamsplitter to align the tracking and gas detection optical paths on the same axis (See Supplementary Methods.7). If the UAV deviates from the center of the instrument’s view, a control algorithm adjusts a two-dimensional rotating platform to realign it, ensuring continuous acquisition of spectral data that includes the absorption characteristics of the target gases. Ultimately, the concentration data of the target gases are derived and analyzed at the control terminal, providing detailed insights into the gas composition. b is an enlarged view of the internal details of AHCTIS.

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