Error compensation for laser line scanners

Abstract

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Digital Twin of an Optical Measurement System

“…The error contribution of the CMM is described in literature and is used in this paper to simulate the error of the CMM [ 10 , 12 ]. The error contribution of the sensor is based on systematic and random error models for specified surfaces in function of the measurement strategy [ 18 ].…”

“…Digital twins, simulating tactile probing errors, often use a normal distributed random error as a representation of the error contributors [ 12 ]; for optical probes this task is more complex. The error contributors of an optical probing system can be classified in multiple categories [ 7 , 18 , 29 , 30 , 31 , 32 ]: Environmental error sources: temperature, humidity, ambient light, dust and vibrations; Surface properties of the object: colour, reflectivity, surface finishing and translucency; Measurement strategy: position of probing system relative to the object and object’s position in the CMM; Hardware of the probing system: accuracy of components and mechanical instabilities; Data processing: resolution, filtering and algorithms; Extrinsic factors: operators, surface cleanliness and clamping system. …”

“…The out-of-plane angle is the component perpendicular to the field of view ( Figure 9 ). The in-plane angle is expressed by (15) and the out-of-plane angle by (16) [ 18 ]. The scan direction of the LLS is in these equations.…”

“…The coefficients of (12) and (13) are determined by scanning a reference sphere [ 18 ]. The values of each coefficient can be found in Table 3 and Table 4 , and the settings of the scanner are presented in Table 5 .…”

“…For example, for a sphere, the normal on the surface in a specified point is the vector from the center to the specified point. The position of the laser source can be obtained by (17) [ 18 ]. This equation represents the intersection of the plane containing the laser beams and the scan trajectory with start position, S .…”