Brief description of the measurement of the diameters of wires or profiles or circular pieces by diffraction of light rays and a device for the implementation of this

摘要

This process consists, on the basis of a monochromatic light source, to create a field of light beam, which is not consistent with a uniform distribution of the light energy, to place the element to be measured in the field of the maintaining in a fixed position, while allowing it to deviations of the position that is parallel to itself - same, to focus the light rays on a sensor placed at right angles to the axis of the light rays, to mask the central zone receiving the flow of the maximum energy, to convert the images of the diffraction fringes, situated on either side of this central zone, into electrical signals, after calibration, the sensor, and to analyze the signals which are a function of the distribution of the light energy. The device for implementing this method comprises: a monochromatic light source s, a diaphragm with an orifice of microscopic size m2 situated on the path of the rays emitted by this source and in the optical axis; a given optical focal length l2, a sensor c, a mask, m3, a converter system analyzer - computer c1 - c2.