Extrinsic calibration of a conoscopic holography system integrated in a CMM

Zapico, Pablo; Fernández, Pedro; Rico, J.C.; Valiño, G.; Patiño, H. Daniel

doi:10.1016/j.precisioneng.2017.12.007

Cited by 10 publications

(9 citation statements)

References 14 publications

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“…It has a modular setup with interchangeable objective lenses enabling various standoffs and working ranges for the same sensor. When integrated in measurement devices, conoscopic technology offers major benefits, such as collinear measurement, low electronic noise dependency, and multiple standoffs, compared with the old-style triangulation method [39]. Table 1 gives the main characteristics of the CH sensor for 50 mm lenses.…”

Section: System Configurationmentioning

confidence: 99%

Automatic and high-accuracy matching method for a blade inspection system integrating fringe projection profilometry and conoscopic holography

Guo

Zhong

et al. 2023

Meas. Sci. Technol.

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The geometric dimensions and tolerances of blades, which are critical parts of turbomachinery with complex features, must be strictly controlled to ensure the efficiency and safety of the engine. Optical-based inspection systems for blades are increasingly receiving attention because of their high efficiency and flexibility. However, as a key issue in blade inspection, the matching of the part coordinate system and machine coordinate system directly determines the measurement accuracy and automation. The blade surface is complex and has no obvious features, and accurate and rapid matching thus remains a challenging problem to solve. To overcome these problems and realize the accurate inspection of blade profiles, an automatic and high-accuracy matching method for a blade measurement system integrating fringe projection profilometry and conoscopic holography is proposed in this paper. First, automatic rough matching is realized making use of the ability of fringe projection profilometry to quickly obtain high-resolution cloud of points and improving the four-point congruent sets algorithm. The path of the conoscopic holography measurement based on the calibration and rough matching result is then planned, to sample high-precision and uniform cloud-of-points data on the blade surface. Finally, a fine matching optimization algorithm is implemented with the signal-to-noise ratio as the weight. The results of simulation experiments and inspection case studies demonstrate that the proposed matching method is efficient and accurate.

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Section: System Configurationmentioning

confidence: 99%

Automatic and high-accuracy matching method for a blade inspection system integrating fringe projection profilometry and conoscopic holography

Guo

Zhong

et al. 2023

Meas. Sci. Technol.

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“…As each point is digitized, the position of the MC axes is registered together with the distance-to-point (𝛾) measured by the CH sensor, and the point coordinates must be expressed in terms that can be recognized by the MC reference system to enable the information to be used for metrological purposes. This is done by means of an extrinsic calibration procedure, inspired by the technique described in [14],…”

Section: Attachment Of the Ch Sensor To The MC And Extrinsic Calibrat...mentioning

confidence: 99%

CNC centralized control for digitizing freeform surfaces by means of a conoscopic holography sensor integrated in a machining centre

Zapico

Patiño

Valiño

et al. 2019

Precision Engineering

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“…At present, there are two types of methods for calibration of the global coordinate system. One adopts a unified calibration object according to the different types of sensors and realizes the global calibration by measuring the calibration object with each sensor [8][9][10]. The other adopts the numerical calculation of the rigid-body transformation matrix by extracting three-dimensional data characteristics of the same object measured by each sensor to achieve global calibration [11,12].…”

Section: Introductionmentioning

confidence: 99%

“…In the case of a multisensor system that comprises a contact probe and an optical scanning probe, geometric invariant of characteristics of the unified target is usually adopted to achieve global calibration. Targets in these methods include a standard sphere [10,13], standard sphere gauge [14,15], polyhedron [9,16], and other special standard objects [17]. The multisensor calibration methods were analyzed and compared using polyhedral and spherical artefacts by Fernández et al [18].…”

Section: Introductionmentioning

confidence: 99%

A Globe Calibration Method for Optical Multisensor in 3D Complex Surface Measurement System

et al. 2022

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There are few existing omnipotent sensors that handle a complex surface inspection task in an accurate and effective way. The prevailing solution is integrating multiple sensors and taking advantage of their strengths. One key task is the extrinsic parameter calibration (global calibration) of the multiple sensors before measurement. This paper proposes a method of optimal extrinsic calibration for a structured light sensor (SLS) and conoscopic holography sensor (CHS). In adopting this method, a common planar calibration board is placed with different poses in front of the multisensory system, and the extrinsic calibration problem is solved through a three-dimensional reconstruction of the calibration board and using geometric constraints of the views from the SLS and CHS. This calibration method, which uses only the plane calibration board, is simple. Physical experiments demonstrate that the proposed method is robust and accurate in the calibration of multiple inhomogeneous optical sensors for the measurement of a complex surface.

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Extrinsic calibration of a conoscopic holography system integrated in a CMM

Cited by 10 publications

References 14 publications

Automatic and high-accuracy matching method for a blade inspection system integrating fringe projection profilometry and conoscopic holography

Automatic and high-accuracy matching method for a blade inspection system integrating fringe projection profilometry and conoscopic holography

CNC centralized control for digitizing freeform surfaces by means of a conoscopic holography sensor integrated in a machining centre

A Globe Calibration Method for Optical Multisensor in 3D Complex Surface Measurement System

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