Linear dynamic calibration device

Abstract

The invention discloses a linear dynamic calibration device, and belongs to the field of digital photogrammetry in geometric quantity measurement. The linear dynamic calibration device disclosed by the invention mainly consists of two parts: a mechanical structure and a calibration module. The mechanical mechanism is mainly composed of four parts: one is a base, the other is a linear motion guiderail, the third is an air floating sliding table component and the fourth is a linear motor and control system. The calibration module is mainly composed of two parts: one is a photographing target, and the other is a magnetic railing ruler and frequency meter. A linear motor is used as a driving unit, which is connected with an air floating sliding table for moving, the magnetic railing ruler isused as a feedback distance signal to realize a closed-loop control function, the photogrammetry target is installed on the air floating sliding table, the air floating sliding table together with thephotogrammetry target can perform uniform linear motion, a digital photogrammetry system measures the moving photographing target and compares a measurement result with a standard value to realize the calibration of the dynamic performance of the digital photogrammetry system. The linear dynamic calibration device disclosed by the invention has a measurement range of 0-3.6m and a maximum runningspeed of 5 m / s, and ensures a uniform motion distance of 1m at the maximum running speed.

Description

Technical field [0001] The invention belongs to the field of digital photogrammetry in geometric quantity measurement, and particularly relates to a linear dynamic calibration device. Background technique [0002] The photogrammetric system has been widely used in automobile manufacturing, aerospace, shipbuilding and other fields after being introduced into our country. In recent years, thanks to the advancement of photographic equipment and the development of data processing methods such as image processing, feature extraction and target discrimination, photogrammetry technology has been increasingly applied in the field of dynamic tracking measurement. [0003] With the increasing demand for non-contact dynamic measurement, domestic and foreign manufacturers have introduced many photogrammetric equipment that can measure dynamic characteristics, which are used in aerospace, shock and vibration, life sciences and other fields. Some of the equipment already has a sampling frequency...

AI Technical Summary

Problems solved by technology

[0009] (1) The installation position of the linear motor is located under the air flotation slide table. Since the mover and stator of the linear motor must be installed with a certain gap, this structure is difficult to assemble

[0010] (2) The movement speed of the air-floating slide table cannot meet the dynamic calibration requirements of the high-speed photogrammetry system

[0011] (3) The arrangement of the air-floating cushion is supported by two working surfaces, and the air-floating sliding table moves up and down under high-speed motion, resulting in unstable movement speed

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