Method and device for non-contact measurement of object volume based on mirror secondary imaging

Abstract

The invention relates to a method and device for non-contact measurement of object volume based on secondary imaging of a mirror. The device includes a rotating stage on which a first parallel light source is laid flat. A plane reflector at an angle of 45° to the vertical is arranged above the top of the rotating stage, a second parallel light source is erected on one side of the rotating stage, and a second parallel light source is arranged on the other side of the rotating stage. The double-sided telecentric lens facing the parallel light source, the double-sided telecentric lens is installed on the CCD camera, and above the CCD camera is a laser that emits the laser horizontally to the plane mirror for reflection to the center of the rotating stage . Compared with conventional methods, the present invention has a great breakthrough in time and precision, and its structure is relatively simple; it can not only measure diffuse reflection, but also can measure the surface of complex objects such as plasticine; in order to obtain non-contact accurate object volume measurement A reliable technical device and method are provided.

Description

technical field [0001] The invention relates to a non-contact measuring method and device for object volume based on mirror secondary imaging. Background technique [0002] Non-contact measurement is a measurement method based on photoelectric, electromagnetic and other technologies to obtain the surface parameter information of the object without contacting the surface of the object to be measured. The traditional non-contact optical three-dimensional measurement technology mainly includes time-of-flight method, interferometry method and triangulation method. Among them, the time-of-flight method generally uses laser light to obtain distance information by measuring the time-of-flight of the light wave, combined with an additional scanning device to scan the entire object to be measured by the light pulse to obtain three-dimensional data; the interferometry method is to pass a beam of coherent light through the spectroscopic system It is divided into measurement light and ...

AI Technical Summary

Problems solved by technology

Although the measurement accuracy of interferometry is high, the measurement range is limited by the wavelength of light, and it can only measure the topography and small displacement of microscopic surfaces, which is not suitable for detecting large-scale objects; optical triangulation is a commonly used optical three-dimensional measurement technology. Based on traditional triangulation, the depth information of the point is calculated by the angle change of the point to be measured relative to the optical reference line offset

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