Uncertainty model for a traceable stereo-photogrammetry system

Sims-Waterhouse, Danny; Isa, Mohammed; Piano, Samanta; Leach, Richard

Abstract

Through the computational modelling and experimental verification of a stereo-photogrammetry system, the expanded uncertainty on form measurement was estimated and was found to be , and for a 95% confidence interval (coverage factors of = 3.2, 2.0 and 2.0 respectively) in the x, y and z axis respectively. The contribution of systematic offsets in the system properties was also investigated, demonstrating the complex distortions of the measurement volume that result from these systematic errors. Additionally, a traceable method of applying a scale factor to the reconstruction was demonstrated using a laser interferometer and gauge block. The relative standard uncertainty on the size of the measurements was estimated to be 0.007% corresponding to length measurement uncertainties of around over a 100 mm range. Finally, the residuals from a linear fit of the scale factor were found to exhibit behaviour that would be expected to result from small offsets in the system properties. The outcome of this work is a better understanding of the propagation of uncertainty through the stereo-photogrammetry system as well as highlighting key influence factors that must be addressed in future work.

Citation

Sims-Waterhouse, D., Isa, M., Piano, S., & Leach, R. (2020). Uncertainty model for a traceable stereo-photogrammetry system. Precision Engineering, 63, 1-9. https://doi.org/10.1016/j.precisioneng.2019.12.008

• Journal Article Type: Article
• Acceptance Date: Dec 16, 2019
• Online Publication Date: Dec 18, 2019
• Publication Date: 2020-05
• Deposit Date: Mar 24, 2021
• Journal: Precision Engineering
• Print ISSN: 0141-6359
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 63
• Pages: 1-9
• DOI: https://doi.org/10.1016/j.precisioneng.2019.12.008
• Keywords: General Engineering
• Public URL: https://nottingham-repository.worktribe.com/output/4121593
• Publisher URL: https://www.sciencedirect.com/science/article/pii/S0141635919306750?via%3Dihub