Automatic compensation of thermal drift of laser beam through thermal balancing based on different linear expansions of metals

Song, Yang; Zhang, Jingyuan; Yang, Yingying; Huang, Jun; Bai, Yunrui; Zhang, Yong; Xin, Lin

doi:10.1016/j.rinp.2019.102201

Cited by 8 publications

(4 citation statements)

References 3 publications

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“…During a calm day, the infinitesimal layer of air in contact with the asphalt road is considered to be in thermal equilibrium with the asphalt road surface. This assumption is supported by plots of temperature profiles near hot road surfaces [15,16] constructed from field measurements. Hui [15] used thermocouples 'to measure the temper ature on the payment surfaces and of nearsurface air at various heights above the pavement surface'.…”

Section: Road Mirage Theorymentioning

confidence: 91%

Road mirage angle

Ruiz

2019

Phys. Educ.

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A video is taken of a roadsign mirage from the passenger seat in a car traveling at constant speed on a highway. The video spans the duration of seeing the mirage of the sign, viewing the vanishing of the mirage as the car approaches, and passing the road sign. The mirage angle, defined as the angle with respect to the horizontal at the moment the observer notes the vanishing of the mirage, can be determined from the video, the speed of the car, and known dimensions of the standard road sign. The value can be checked with a theoretical formula using the ambient weather temperament and consulting references to determine the temperature of the air in contact with the road surface. Agreement between observation and theory is within the error bounds. In the conclusion, a quick observational estimate is made in the car without needing the video.

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Section: Road Mirage Theorymentioning

confidence: 91%

Road mirage angle

Ruiz

2019

Phys. Educ.

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“…where ∆l is the solid deformation caused by the temperature rise, l is the original size of the measured object, α is the CTE of a certain material and T 0 is the initial temperature of the object (after a period of temperature rise, the temperature of the object reaches T). In Equation ( 2), α is assumed to be constant within a large temperature range, and the temperature distribution is proven to be uneven by the measurement above; the value of α also changes continuously with temperature [34,35]. Given α(x) and α(y) as functions of CTE on the x and y axes, which change with f (x) and g(y), Equation (3) was established as…”

Section: Optimal Algorithm Of Thermal Deformation Based On Measured Temperature Datamentioning

confidence: 99%

Optimization Algorithm and Joint Simulation to Micro Thermal Deformation Using Temperature Measurement in the Orifice of Hydraulic Valve

et al. 2020

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When exposed to viscous heating, hydraulic valve orifices experience thermal deformation, which causes spool clamping and actuator disorder. Quantitative research on thermal deformation can help reveal the micro-mechanism of spool clamping. In this study, miniature thermocouples are embedded into a valve orifice with an opening size of 1 mm to measure temperature distribution. An optimization algorithm based on measurement data (M-OA) for the thermal deformation of the valve orifice is proposed. The temperature and thermal deformation of the valve orifice are calculated through Fluent and Workbench joint simulation, with the measurement data serving as boundary conditions. Results show that, for a valve orifice with a valve wall length of 18 mm, when the temperature of the sharp edge is at 60 °C, thermal deformation measures 7.7 μm via observation and 7.62803 μm via M-OA, indicating that the M-OA method is reliable. The results of the joint simulation can be accepted because measurements of temperature reached an accuracy rate of 95%, and that of deformation reached 82.7%. A large drop in pressure led to a rapid increase in temperature, causing serious thermal deformation of the valve orifice. With an inlet pressure of 3 MPa, the temperature of the sharp edge reached 72.9 °C within 110 min, and radial thermal deformation can reach 8.3 μm. Such deformation poses great risk of spool clamping for a spool valve of Φ36 mm.

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“…The above research analyzed the influence of different factors on the laser spot location, which undoubtedly was of important value, but their analysis did not include the environment factors and still need to be further improved. The external environment change, such as environment temperature, air-flow and air micro particles leads to the distortion of the laser source in the process of emission and transmission, resulting in the drift and dither of the imaging spot [10,11]. Especially in high precision measurement equipment, the measurement error caused by these external factors could not be ignored.…”

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.

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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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Automatic compensation of thermal drift of laser beam through thermal balancing based on different linear expansions of metals

Cited by 8 publications

References 3 publications

Road mirage angle

Road mirage angle

Optimization Algorithm and Joint Simulation to Micro Thermal Deformation Using Temperature Measurement in the Orifice of Hydraulic Valve

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

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