Non-contact length measuring device

Abstract

The present invention relates to a non-contact length measuring device and belongs to the length measurement technical field. The non-contact length measuring device comprises at least one non-contact length measuring sensor; the non-contact length measuring sensor comprises a housing as well as an imaging module, an image processing module and an interface control module which are arranged in the housing; the imaging module comprises a laser light source, a focusing lens, a magnifying lens and a light sensing element; a laser beam generated by the laser light source is projected onto a measured object through the focusing lens; after being reflected by the measured object, the laser beam passes through the magnifying lens, and then the laser beam is imaged on the light sensing element; the light sensing element sends image data to the image processing module at a high frequency; the image processing module converts the image data into displacement quantity data; and the interface control module converts the displacement quantity data into pulse signals or digital signals and outputs the pulse signals or digital signals. The non-contact length measuring device has the advantages of high measurement accuracy and high speed.

Description

technical field [0001] The invention relates to the technical field of length measurement, in particular to a non-contact length measurement device. Background technique [0002] The measurement of the displacement and length of the measured object is an important part of metrology science and measurement methods, especially in precision machining, aerospace, national defense, military and communications, and many other fields. It is a physical contact mechanical and photoelectric measurement method. These methods use a wheel to contact the measured object. After the measured object drives the wheel to rotate through friction, the displacement is obtained by recording the amount of rotation. This method is used in practical applications. , There will be wheel wear affecting the measurement accuracy, the smoother surface is not easy to detect or the measurement is inaccurate, the speed is slow, the accuracy is low, the direction is single, and the longer the length, the lower...

AI Technical Summary

Problems solved by technology

Since the present invention adopts a laser sensor, the incident point of the two parallel light beams is the measuring probe, so there is no interference to the measured object in the measurement process, and it is not limited by environmental conditions, and can be used for measurement in various occasions; in addition, due to mutual The correlation analyzer adopts the online digital direct calculation method. Therefore, under the premise of the same online measurement response speed, its statistical measurement accuracy is obviously better than that of polar correlation analysis, and it can reduce the measurable signal-to-noise ratio. However, this technical solution passes two A group of measuring probes collects data, which is easy to cause errors and has low accuracy

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