The invention provides a calibration grating for calibrating an optical fiber test instrument. The calibration grating comprises a shell which is provided with a cavity with an opening, wherein the cavity wall of the cavity is provided with a track groove which is provided with two bent and communicated segments; a sliding base which is arranged in the cavity, wherein a spring is arranged betweenthe sliding base and the bottom wall of the cavity, a grating mounting base with a standard grating sheet is arranged on the sliding base and is a light-transmitting piece; and a handle which is arranged in the rail groove in a penetrating mode and can move in the rail groove, wherein the handle is connected with the sliding base, and the handle drives the sliding base to slide in the cavity so that the grating mounting base extends out of the opening or is stored in the shell. The standard grating sheet is arranged in the grating mounting base, the retraction and the extension of the gratingmounting base can be controlled through the handle, the grating mounting base with the standard grating sheet is directly arranged in the optical fiber test instrument, and the shell of the optical fiber geometrical parameter test instrument does not need to be disassembled so that the calibration is faster and more convenient, and unnecessary errors caused by disassembling the instrument are avoided to the greatest extent.

Calibration grating for calibrating optical fiber test instrument and calibration method

The invention relates to a coaxial illumination mirror image Moire measuring device and method. The coaxial illumination mirror image Moire measuring device comprises a camera, a telecentric light path lens set, a spectroscope, an LCD optical grating, a diffusion light source and a computer system, wherein the spectroscope has a half-permeating and half-reflection characteristic, the included angle between the spectroscope and the central axis is 45 degrees, and the spectroscope can reflect light of the diffusion light source to a mirror object to be detected, so that coaxial illumination is formed. The LCD optical grating is connected with the computer system, and the frequency and direction of grid lines can be changed through programming. The coaxial illumination mirror image Moire measuring method includes the step of device adjustment, wherein the mirror object to be detected is put behind the optical grating, the step of data collection, wherein the camera and the telecentric light path lens set are used for permeating the optical grating and shooting a Moire fringe graph formed by the grid lines of the optical grating and a virtual image of the optical grating in an overlapping mode, and the step of data processing, wherein the computer system is used for processing the Moire fringe graph, and a three-dimensional shape of the mirror to be detected is rebuilt.

Guo Hongwei

Papers

Coaxial illumination mirror image Moire measuring device and method