Method for fast detecting alpha-alumina on surface of spraying wear-resistant impregnated paper

The invention discloses a method for fast detecting alpha-alumina on the surface of spraying wear-resistant impregnated paper. The method includes the following steps that sampling and dyeing are performed, wherein a to-be-detected spraying wear-resistant impregnated paper sample of preset area is placed in a dyeing agent and dyed; image scanning is performed, wherein after the dyed spraying wear-resistant impregnated paper is dried, an image is formed through scanning of a scanner; image processing is performed, wherein image contrast is adjusted so that alpha-alumina particles can be prominent, and re-sharpening enables the edges of the alpha-alumina particles to be clear; image analysis is performed, wherein the diameter of each alpha-alumina particle and the distribution state of the alumina on the paper surface are obtained through processing of image processing software; according to the obtained diameter of each alpha-alumina particle, the mass of the alpha-alumina which the surface of unit area of the impregnated paper is covered with is calculated. By means of the method, the mass of the alumina on the surface of the impregnated paper can be fast obtained, and the distribution condition of the alumina can also be observed; operation does not need to be performed under the high-temperature condition, the testing process is simple and fast, the method is suitable for real-time detection on a production line, and detection precision is sufficient.