Method for acquiring SO2 concentration image based on calibration coefficient and light dilution effect correction

The invention discloses a method for acquiring an SO2 concentration image based on calibration coefficient and light dilution effect correction. The method comprises the following steps: acquiring a sky background and smoke plume signal image by using an SO2 ultraviolet camera system, and calculating to obtain the SO2 optical thickness; determining a self-calibration coefficient by using the sky background image, and converting the optical thickness image into a concentration image; and light dilution correction is carried out by combining distance and visibility information measured by the distance measuring instrument and the atmospheric visibility measuring instrument, so that accurate inversion of SO2 concentration is realized. Compared with the prior art, the method has the advantages that the defects that the SO2 ultraviolet camera must depend on external equipment for calibration and the measurement error is increased along with the detection distance are overcome, additional calibration equipment and