Experimental method and device for calibrating measuring errors of point laser displacement sensor

Abstract

The invention relates to a point laser displacement sensor, in particular to an experimental method and an experimental device for calibrating measuring errors of a point laser displacement sensor. The experimental method comprises a laser interferometer, an optical path assembly, a six-degree-of-freedom fixing frame, the point laser displacement sensor, a sine bar, an index plate, a standard gauge block and a numerical control machining center. The experimental method constructs mathematical models of an incident tilt angle, an incident turning angle and an incident swinging angle when the point laser displacement sensor measures an object surface, derives a relationship among the three angles, and provides a theoretical support for error calibration of the point laser displacement sensor. The error calibration experimental device is established based on the mathematical models, the experimental device is simple in operation and highly targeted, can greatly simplify the experimental workload, performs error analysis on the experimental result, obtains influence rules of the three measuring factors of the incident tilt angle, the incident turning angle and the incident swinging angle on the measuring errors, and provides guarantee for the workpiece non-contact, rapid and precise detection technology based on the point laser displacement sensor.

Description

technical field [0001] The invention relates to a point laser displacement sensor, in particular to an experimental method and device for correcting measurement errors of a point laser displacement sensor. Background technique [0002] As a promising non-contact measurement method, laser measurement is widely used to solve various geometric information measurement problems. The basic working principle of laser measurement is laser triangulation. The laser measurement system manufactured by this principle is widely used to measure the surface profile of objects, various geometric dimensions and free-form surface topography. However, there are also the following error factors in the laser triangulation measurement process: 1) Imaging system error, mainly affected by lateral magnification and objective lens distortion; 2) Data processing error and system installation error; 3) Environmental factor errors such as temperature and humidity ; 4) The error introduced by the change ...

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Problems solved by technology

However, the literature has the following limitations: 1) Only the incident inclination angle is analyzed in detail, and other object surface measurement characteristics, such as incident rotation angle and incident swing angle, are not described.

2) The in...

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