Graphic projection moire method of measurement

摘要

A graphic projection method for measuring objects, characterized in that a raster is projected onto the surface of the object to be studied by the projector with parameters specified in the software installed on the computer, this image is scanned by a camera, images obtained in this way are entered into a computer in which the “imaginary "Raster, characterized in that the" imaginary "raster is obtained using a printing raster and a camera or projector, a camera and a flat surface or mathematical m They were dressed in laboratory conditions, while the “imaginary” raster and image obtained by scanning with a camera have different contrast and color, and when obtaining a picture of moire stripes, the condition must be met: a = a, where a is the step of the projector stripes at a given distance, a - step of the camera strip at a given distance. 2. The method according to claim 1, characterized in that the distance from the centers of the moire stripes to the plane of the "imaginary" raster is determined by the formula: where a is the step of the strips of the "imaginary" raster, n is the order of the strip, α is the angle of incidence of the projector's rays, calculated by the formula: α = ma, where m is the scale of the "imaginary" raster, a is the step of the bands of the "imaginary" raster, determined by direct measurements upon receipt of the "imaginary" raster in laboratory conditions, while m is calculated by the formula:, where d is the distance to the "imaginary" raster, d is the distance to the specified "imaginary" raster.