Special verification/calibration device for digital level

Abstract

The invention relates to a special verification / calibration device for a digital level, which relates to the field of surveying instrument metrological verification, in particular to the special verification / calibration device for the digital level for indoors verifying various technical indexes of the digital level. The device comprises two parallel light pipes arranged face to face, wherein central axes of the two parallel light pipes are in the same straight line; three reticle installation heads are arranged on each parallel light pipe; two reticle installation heads are arranged on a pipe body of each parallel light pipe; the other reticle installation head is arranged on one end of each parallel light pipe. The special verification / calibration device for the digital level provided by the invention is simple in structure; three reticles are arranged independently and can independently image, so that the technical problem of blurred vision caused by field depth of an image is effectively solved; a controller is utilized for controlling the brightness and on / off of a light source of a corresponding reticle; and a two-dimensional inclined elevated working platform is utilized for enabling the digital level to be calibrated to be at an orthogonal state in a tilting manner in a two-dimensional direction.

Description

technical field [0001] The invention relates to the field of measurement and verification of surveying and mapping instruments, in particular to a special verification / calibration device for a digital level for indoor verification of various technical indicators of a digital level. Background technique [0002] At present, the verification of digital levels is mostly carried out by the outdoor method. With the development of technology, the indoor collimator simulation method has been applied. According to the provisions of the national metrology standard "JJG (Survey and Mapping) 2101-2013 Digital Level", the verification / calibration device consists of two special collimator devices placed on opposite diameters and a set of lifting and micro-tilting devices. [0003] The existing special device for collimators is to install one or two different reticles inside each collimator, on which the miniature images of barcode rulers matching the digital levels of different manufactu...

AI Technical Summary

Problems solved by technology

However, the design of the existing collimator reticle adopts the coaxial optical design method, and has two structures: the first type is to place a reticle of a barcode scale image at a fixed distance ( 15 meters or 30 meters, or a distance in between), the defect of this structure is that because the reticle is not in the normal position, the instrument is often unable to recognize and cannot measure; the other is to install two digital reticles , place the reticle at the corresponding focal lengths of 15 meters and 30 meters respectively, since the reticle at the position of 15 meters will block the reticle at the position of 30 meters, only a "misplaced" design can be adopted, that is, the reticle at the two points Barcode image engraving on the left and right sides of the scratch board

Defects of this structure: 1. Due to the limitation of the size of the reticle, the available space is only 1 / 2 of the size of the reticle, and it is impossible to simultaneously engrave the barcode images of various instruments from different manufacturers; 2. As far as the digital level is concerned, due to the objective imaging depth of field, aiming at any one of the reticles, there will be mutual interference between the images, and blurred shadows will appear in the field of view; 3. If the number of barcodes on the reticle is increased, only If the image is marked on the edge of the reticle, it will not be able to be measured accurately due to the influence of aberration

At the same time, there is a common shortcoming of these two structural methods, that is, it is impossible to place the reticle at the infinity position

To establish a horizontal reference device, it is necessary to have two infinite target reticles, and its significance lies in the fact that it can complete the verification / calibration of items such as optical i-angle and line-of-sight multiplication constants stipulated in the verification regulations; while the existing The device cannot meet the requirements of the verification regulations

[0004]In addition, the widely used two-dimensional tilting lifting workbench adopts a non-orthogonal tilting structure design, which will lead to inaccurate It can form tilt adjustment along the optical axis direction and perpendicular to the optical axis direction, but cannot complete the accurate measurement of this index

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