Analysis of factors affecting measurement accuracy and establishment of an optimal measurement strategy of a laser displacement sensor

Abstract

Laser triangulation method is widely used in online precision measurement owing to its advantages of being fast, accurate, and dynamic, and having large-scale measurement capability. To improve the accuracy of laser triangulation, the scan depth, inclination angle, rotation angle, and deflection angle are defined. Then, a spatial pose error model and an experimental model for laser measurement error are established. Next, error analysis experiments are conducted, and the influence of spatial pose parameters on the error is analyzed. Further, error proofreading experiments on the surface characteristics of the measured workpiece, including the material, surface roughness, and color, are completed, and their influences on the error are analyzed. Based on the experimental data, an error correction model based on support vector regression is established. Measurement strategies are formulated considering multi-factor constraints such as optical path interference, mechanical interference, scan depth of field, measurement angle, and measurement path. The tooth profile of a cycloid gear is taken as the measurement object, then the measurement path planning is performed, and the error correction model is used to correct the measured data. The accuracy of the results agrees well with the result of a fully automatic computer numerical control (CNC)-controlled P 65 precision measuring center.

Damage Security Intelligent Identification of Wharf Concrete Structures under Deep Learning and Digital Image Technology

“…The clarity of the image will be affected due to a series of problems, such as the difference in the grayscale gradient of the speckle image, the reflection on the component's surface, and the change of light during the test. At the algorithm level, selecting the sub-region size, interpolation algorithm, and shape function of the study area will cause different systematic errors in the calculation [25].…”

A Novel Method for Pose and Position Calibration of Laser Displacement Sensors

“…For laser displacement sensors using the trigonometric principle, the maximum value of the angle between the laser beam and the normal vector of the surface to be measured is limited [ 17 ], and is usually less than . At the same time, in order to avoid the strangeness of the equations, there should be a minimum limit of an angle between any two postures in the process of changing the attitude of the wafer.…”

Precise Measurement and Visual Expression of Gear Overall Deviation

“…Pitch deviation refers to the difference between the actual pitch and the nominal pitch of one gear tooth at the indexing circle [21]. Based on the actual curve expression of any section of the previous gear, the coordinate, P(x P , y P ), of any intersection point of the actual profile curve at the indexing circle can be obtained by solving it in conjunction with the theoretical indexing circle equation.…”

“…Pitch deviation refers to the difference between the actual pitch and the nominal pitch of one gear tooth at the indexing circle [21]. Based on the actual curve expression of any section of the previous gear, the coordinate, ( , ) Given that the theoretical pitch deviation of the measured gear is 0 P , the pitch deviation of the gear at any two adjacent tooth profiles can be expressed as:…”

“…Pitch deviation refers to the difference between the actual pitch and the nominal pitch of one gear tooth at the indexing circle [21]. Based on the actual curve expression of any section of the previous gear, the coordinate, ( , )…”