Landslide sliding displacement and sliding speed monitoring method based on double-slit diffraction

The invention discloses a landslide sliding displacement and sliding speed monitoring method based on double-slit diffraction, and the method comprises the following steps: a, arranging a diffracted light source and a lightproof plate with two parallel slits in a side slope, enabling the light direction of diffracted light to directly face the slits, and arranging an optical screen above a landslide body; b, adjusting the relative positions of the diffracted light source and the light screen, so that horizontal alternately dark and bright stripes can be clearly observed on the light screen; and c, when the landslide body slides downwards, alllowing the coordinates of the alternately bright and dark stripes on the optical screen to move upwards/downwards reversely; when the landslide body horizontally slides away from the diffracted light source, allowing the light screen to horizontally slide along with the landslide body in the forward direction or away from the diffracted light source, and increasing or dec