Generally speaking, laser-induced fluorescence means that the laser beam hits the sample and the sample produces fluorescence.

Planar laser-induced fluorescence refers to shaping the laser beam into a piece of light and then hitting the sample. Generally, planar laser-induced fluorescence is used for combustion diagnosis and plasma diagnosis. These substances are transparent, and the plane laser can pass through the burning flame or plasma, and then be photographed by a camera, and the image photographed by the camera is a 2D image.

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