Dr. Zhuojiang Nan Profile

Dr. Zhuojiang Nan

at Shanghai Jiao Tong Univ

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Publications (2)

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Proceedings Article | 15 February 2024 Paper

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

Zhuojiang Nan, Chenbo Gong, Wei Tao

Proceedings Volume 13069, 130690X (2024) https://doi.org/10.1117/12.3016668

KEYWORDS: Sensors, Design, Imaging systems, Uncertainty analysis, Reflection, Measurement uncertainty, Laser systems engineering, Mirrors, Motion measurement, Laser sources

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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.

Proceedings Article | 13 November 2019 Paper

Research on laser source drift with temperature of laser triangular displacement sensor

Zhuojiang Nan, Yu Feng, Hui Zhao, Wei Tao

Proceedings Volume 11343, 1134326 (2019) https://doi.org/10.1117/12.2553013

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Laser triangular displacement sensor (LTDS) is widely used in various high-precision measurement scenarios, but the accuracy of the sensor will be distinctly reduced in a working environment with extreme temperature. The mechanical structure, optical crystal and illuminant of the sensor will be distorted or drifted due to the impact of temperature change. This paper focuses on the spatial drift characteristics of illuminant on the measured surface with temperature change. The self-developed LTDS prototype is used to conduct the temperature-rising experiment of the "illuminant - collimated lens" system, and the centroid drift of the spot formed by the illuminant under two different power supply currents (16mA and 24mA) is recorded. The experimental results show that the centroid of laser spot appears clustering phenomenon in the process of heating. After filtering the noise generated by clustering phenomenon, the drift of the centroid of laser spot in the spatial plane presents a linear directional law, and the drift distance presents a quadratic function relationship with the change of temperature. In addition, the error evaluation model is used to calculate the actual measurement error of the sensor caused by the centroid drift of the spot. The measurement error of the sensor is quadratic function with the change of temperature. Comparing the results of heating experiment under 16 mA and 24 mA power supply, choosing appropriate power supply current (24 mA) can effectively suppress clustering phenomenon and improve the stability of illuminant.

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