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

Nan, Zhuojiang; Feng, Yujun; Zhao, Hui; Tao, Wei

doi:10.1117/12.2553013

Cited by 5 publications

(3 citation statements)

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“…Specifically, when the injection current variation was ∆i, the LD temperature variation was ∆T, the divergence angles of x-axis and y-axis were θ x (∆i, T + ∆T) and θ y (∆i,T + ∆T) respectively. And the divergence angle in x-y plane was θ x,y (∆ i, T + ∆T), which could be rewritten as equation (13) based on equations (11) and (12):…”

Section: Influencing Factors Of Ldmentioning

confidence: 99%

“…In our previous work, we built an laser spot imaging platform based on low-power LD to analyze the impact of drastic changes in environment temperature and LD injection current on laser spot location [12]. However, we still lack the control of the internal temperature of the LD its-self, and only considered the change of the energy distribution in one dimension of the laser spot (since we only adapted linear CCD as imaging detector).…”

Section: Introductionmentioning

confidence: 99%

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Research on laser spot location accuracy of low-power laser diode source applied to high precision laser measurement system

Nan

Zhou

Wan³

et al. 2022

Meas. Sci. Technol.

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The results of laser spot location have an important influence on the accuracy of a laser measurement system. Laser diode (LD) sources have been widely used in recent years because of its low cost and easy integration. Based on the low-power LD source, a conventional laser spot location system was built to study the factors that affect the accuracy of location. We analyzed the influencing factors on laser spot location from two aspects of LD driven and CCD imaging, and experiments were conducted to further obtain quantitative analysis results and laws on different influencing factors, including the LD temperature, LD injection current, the size of imaging laser spot and its intensity fluctuation. The drifting RMS and the dithering range R were adapted to evaluate the drift and dither of the laser spot respectively, and the influence laws of location error were discussed. Finally, laser triangulation displacement sensor was taken as an optimization design example when considering the influencing factors studied in this paper. As a result, the RMS accuracy of the design example was 3.6μm and its repeatability was 2.17 μm. The experimental results provided guidance for the optimization design of laser spot location measurement system.

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Section: Influencing Factors Of Ldmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research on laser spot location accuracy of low-power laser diode source applied to high precision laser measurement system

Nan

Zhou

Wan³

et al. 2022

Meas. Sci. Technol.

Self Cite

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“…Additionally, it has been demonstrated that distance sensors exhibit a general drift over time due to temperature fluctuations [34,53,54]. Table 1 shows an exemplary overview and impact of several parameters in a laser triangulation setup with the previously given dimensions.…”

Section: Error Model In a Laser Triangulation Systemmentioning

confidence: 99%

Optical Setup for Error Compensation in a Laser Triangulation System

Kienle

Batarilo

Akgül

et al. 2020

Sensors

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Absolute distance measurement is a field of research with a large variety of applications. Laser triangulation is a well-tested and developed technique using geometric relations to calculate the absolute distance to an object. The advantages of laser triangulation include its simple and cost-effective setup with yet a high achievable accuracy and resolution in short distances. A main problem of the technology is that even small changes of the optomechanical setup, e.g., due to thermal expansion, lead to significant measurement errors. Therefore, in this work, we introduce an optical setup containing only a beam splitter and a mirror, which splits the laser into a measurement beam and a reference beam. The reference beam can then be used to compensate for different error sources, such as laser beam dithering or shifts of the measurement setup due to the thermal expansion of the components. The effectiveness of this setup is proven by extensive simulations and measurements. The compensation setup improves the deviation in static measurements by up to 75%, whereas the measurement uncertainty at a distance of 1 m can be reduced to 85 μm. Consequently, this compensation setup can improve the accuracy of classical laser triangulation devices and make them more robust against changes in environmental conditions.

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Laser pointing error analysis and compensation method of low-power laser diode source applied to triangulation ranging system

Nan

Tao

Zhao

2021

Review of Scientific Instruments

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The pointing drift and dither of the light source greatly reduces the measurement accuracy of the laser triangulation ranging system. In particular, for the low-power laser diode (LD) source, the temperature drift and the dither of the LD itself are more obvious. In this paper, the influence factors on the laser pointing error were analyzed by experiments and simulations based on the triangulation ranging system, and a combined optimization algorithm was proposed to compensate the pointing error. First, we built a platform for testing the directivity of low-power LD and analyzed the directivity drifting error caused by the change in LD temperature, the dithering error of the LD at constant temperature. In addition, the measurement error caused by the thermal deformation of the focusing lens was also analyzed in ZEMAX. Second, polynomial fitting was adapted to preliminarily correct the LD temperature drifting error, and the Kalman filter was introduced to further optimize the measurement results with the aim of improving both the absolute accuracy and repeatability of the laser triangulation ranging system. The experimental results showed that the measurement root mean square error was 0.91 µm and the repeatability was 0.61 µm after the pointing error was compensated by the method we proposed.

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

Cited by 5 publications

References 0 publications

Research on laser spot location accuracy of low-power laser diode source applied to high precision laser measurement system

Research on laser spot location accuracy of low-power laser diode source applied to high precision laser measurement system

Optical Setup for Error Compensation in a Laser Triangulation System

Laser pointing error analysis and compensation method of low-power laser diode source applied to triangulation ranging system

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