Errors in non-contact sensor measurements due to misalignment and scanning methodology

Warlick, Zachary; Katz, Reuven

doi:10.1051/ijmqe/2015018

Cited by 3 publications

(2 citation statements)

References 15 publications

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“…In interferometric synthetic aperture radar (InSAR), the wrapped phase is the absolute phase's principal value, i.e., a modulo-2π observation. In optical metrology, InSAR, or any other similar technology, the pair of signal data elements, i.e., U real and U im , and consequently ψ, are not immune to noise, which can originate from a variety of sources [4][5][6] and is the primary cause of inaccuracies.…”

Section: Introductionmentioning

confidence: 99%

A Variational Model for Wrapped Phase Denoising

2023

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This paper presents a variational model for the denoising of wrapped phase images. By enforcing the required Pythagorean trigonometric identity between the real and imaginary components of the signal, this model improves the signal-to-noise ratio of the restored signal. To preserve phase map discontinuities, the model is based on total variation. The existence and uniqueness of the model’s solution are demonstrated using standard techniques. In addition, the convergence of a rapid fixed-point method to determine the numerical solution is demonstrated. Experiments on both synthetic and actual patterns validate the model’s performance.

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Section: Introductionmentioning

confidence: 99%

A Variational Model for Wrapped Phase Denoising

2023

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“…It is important to mention here that the acceptable eccentricity values may wary for different materials and different surface finishes the study of which was beyond the scope of this paper. Moreover, for measuring deep hole, as the alignment of the probe in the hole becomes a major issues as the probe moves down the hole particularly for scanning hole geometry [26,35]. This can also exaggerate the eccentricity of probe.…”

Section: Stage 1 Set 1: Determining the Acceptable Range Of Eccentrimentioning

confidence: 99%

An investigation of highly accurate and precise robotic hole measurements using non-contact devices

Usman

Monfared

Lohse

et al. 2016

Int. J. Metrol. Qual. Eng.

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Abstract. Industrial robots arms are widely used in manufacturing industry because of their support for automation. However, in metrology, robots have had limited application due to their insufficient accuracy. Even using error compensation and calibration methods, robots are not effective for micrometre (μm) level metrology. Non-contact measurement devices can potentially enable the use of robots for highly accurate metrology. However, the use of such devices on robots has not been investigated. The research work reported in this paper explores the use of different non-contact measurement devices on an industrial robot. The aim is to experimentally investigate the effects of robot movements on the accuracy and precision of measurements. The focus has been on assessing the ability to accurately measure various geometric and surface parameters of holes despite the inherent inaccuracies of industrial robot. This involves the measurement of diameter, roundness and surface roughness. The study also includes scanning of holes for measuring internal features such as start and end point of a taper. Two different non-contact measurement devices based on different technologies are investigated. Furthermore, effects of eccentricity, vibrations and thermal variations are also assessed. The research contributes towards the use of robots for highly accurate and precise robotic metrology.

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