Real-time computer-generated frequency-carrier Moiré profilometry with three-frequency heterodyne temporal phase unwrapping

Zhang, Hechen; Cao, Yiping; Li, Hongmei; Xu, Chuan; An, Haihua; Wu, Haitao; Yang, Na

doi:10.1016/j.optlastec.2023.109201

Cited by 9 publications

(1 citation statement)

References 28 publications

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“…Considering the long distance and dynamic motion of object, we divide the error sources into three categories: laser source dithering error, laser beam drifting error and dynamic motion error. Laser dithering generally refers to the minor offset of the laser spot on the image plane when the external condition is relatively stable, which is related to the energy distribution of the laser spot [17,18].The laser beam drift generally refers to the obvious position shift of laser spot on the imaging plane caused by the variation of medium refractive index in the process of laser beam propagation, including variable factors such as ambient temperature, humidity, airflow disturbance and so on [19,20].Furthermore, the dynamic objects will affect the accuracy of laser spot location. When the object moves along the X-direction or Y-direction, the energy distribution of the imaging spot changes, resulting in deviation of the location result along the motion direction.…”

Section: Error Source For Long-distance Dynamic Objectsmentioning

confidence: 99%

Uncertainty analysis and optimization design of long-distance laser triangulation displacement sensor applied to dynamic object

Nan,

Gong,

Tao

2024

International Conference on Optical and Photonic Engineering (icOPEN 2023)

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The principle of laser triangulation has been widely used in various high-precision measurement due to its advantages of high accuracy, fast response speed and simple structure. However, the laser triangulation method still has some limitations for the measurement of dynamic object, and the accuracy of laser location will be significantly reduced especially when the working distance becomes longer. We have carried out the development and performance optimization of a long-distance laser triangulation displacement sensor for the application of dynamic object. The measurement uncertainty is analyzed when the laser dithering, laser drifting and object motion are all taken into account. Then, reflectors are added to the optical path structure of traditional laser triangulation system with the aim to improving its sensitivity and expanding its working range. The experiment results show that the repeatability of our designed optical system is 2.9μm and the imaging uniformity is 86.23% when the working distance is of 1300mm.

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