Sources and solutions of measurement accuracy errors of image measuring instruments

The video Measuring Instrument is a geometric optical testing instrument that has developed rapidly in the past ten years. It is based on the principle of optoelectronic device projection, combined with the application of current electronic technology and computer processing expertise, to measure the edge contour of the test piece to determine the length. A two-dimensional plane coordinate part inspection instrument for specification inspection. This experimental instrument can efficiently detect the outline and surface shape specifications, angles and positions of various complex-shaped product workpieces, especially for external effect detection and quality control of precision-machined parts. Fluorescent penetrating assembly line detection can be used for new product development, Reverse engineering, product quality inspection and other fields.

1. The structural composition and optical principle characteristics of the video measuring instrument.

Video measuring instruments generally consist of six parts, including industrial equipment, lighting fixtures, length measurement, image collection, computers and detection systems. The optical principle of the video measuring instrument is very similar to that of a general projector. The difference is that the outline image of the tested object is received by the CCD sensor and collected and processed by the computer, while the image is immediately projected by the latter. When looking at the projection viewing screen, the outline is oriented towards the eyes of the worker, resulting in a large gap in measurement accuracy and automation capabilities between the two.

Video measuring instruments generally have a very large inspection range and are generally equipped with a (0.7@~4.5@) zoom eyepiece. In addition to a wide range of bottom lights and top lights, the mobile bridge coordinate measuring machine lighting fixtures also have ring lighting fixtures. , suitable for applications when neither the bottom light nor the top light can effectively illuminate the lamp. 1) Error of photoelectric sensor counting scale;

2. Errors caused by flatness and angular pendulum when the workbench is moved;