Precision Measurement Method of Large Shaft Diameter Based on Dual Camera System

Li, Xianyou; Xu, Ke; Wang, Shun

doi:10.3390/s22113982

Cited by 7 publications

(8 citation statements)

References 27 publications

(22 reference statements)

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“…Given the measurement range of diameters from 600 mm to 800 mm, the projection method is unsuitable for measurement. Therefore, an improved method based on a dualfield-of-view optical path with dual CCDs is proposed [15], as illustrated in Figure 2. The system comprises five main components: illumination, the object under measurement, reception, signal processing, and actuation.…”

Section: Symmetrical Double-telecentric Optical Path For Large-sized ...mentioning

confidence: 99%

Design of an Imaging Optical System for Large-Sized Stepped Shaft Diameter Detection

Duan,

Li,

Zhu

et al. 2024

Applied Sciences

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Addressing the prevalent issues of low accuracy, low efficiency, and poor image quality in online diameter measurement of large-sized stepped shafts, this study introduces a novel method based on a symmetrical dual-telecentric optical path utilizing dual CCDs, specifically designed for step shafts with diameters ranging from 600 mm to 800 mm. By developing and optimizing an imaging system grounded in the object-image dual-telecentric optical path principle and employing Zemax software for comprehensive analysis and optimization, this research achieves significant findings. The system’s Airy disk radius is calculated at 3.204 μm; the modulation transfer function (MTF) remains above 0.6 across various fields of view at a spatial cutoff frequency of 71.4 lp/mm, with smooth MTF curves; the field curvature is confined within 0.1 μm; and the distortion is maintained below 0.1%, fulfilling high-quality imaging requirements. Additionally, a tolerance analysis is conducted to ensure the system’s stability and reliability. Applied to an experimental setup for measuring the diameter of large-sized step shafts, the system demonstrates an improved measurement precision of 0.02 mm. This research offers a robust technical solution for the high-precision online measurement of large stepped shaft diameters, presenting significant practical implications for enhancing productivity and product quality.

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Section: Symmetrical Double-telecentric Optical Path For Large-sized ...mentioning

confidence: 99%

Design of an Imaging Optical System for Large-Sized Stepped Shaft Diameter Detection

Duan,

Li,

Zhu

et al. 2024

Applied Sciences

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show abstract

“…However, random errors in a single measurement are still a significant concern. Li et al [ 17 ] proposed a precise measurement method for large shaft diameters using a dual-telecentric camera-based measurement system. They developed a calibration method for two telecentric cameras based on Zhang’s calibration method [ 18 ] and established a common world coordinate system for the two cameras using the dual-camera imaging model.…”

Section: Introductionmentioning

confidence: 99%

A Method for Measuring Shaft Diameter Based on Light Stripe Image Enhancement

Li,

Xu,

Liu

et al. 2024

Sensors

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When the workpiece surface exhibits strong reflectivity, it becomes challenging to obtain accurate key measurements using non-contact, visual measurement techniques due to poor image quality. In this paper, we propose a high-precision measurement method shaft diameter based on an enhanced quality stripe image. By capturing two stripe images with different exposure times, we leverage their different characteristics. The results extracted from the low-exposure image are used to perform grayscale correction on the high-exposure image, improving the distribution of stripe grayscale and resulting in more accurate extraction results for the center points. The incorporation of different measurement positions and angles further enhanced measurement precision and robustness. Additionally, ellipse fitting is employed to derive shaft diameter. This method was applied to the profiles of different cross-sections and angles within the same shaft segment. To reduce the shape error of the shaft measurement, the average of these measurements was taken as the estimate of the average diameter for the shaft segment. In the experiments, the average shaft diameters determined by averaging elliptical estimations were compared with shaft diameters obtained using a coordinate measuring machine (CMM) the maximum error and the minimum error were respectively 18 μm and 7 μm; the average error was 11 μm; and the root mean squared error of the multiple measurement results was 10.98 μm. The measurement accuracy achieved is six times higher than that obtained from the unprocessed stripe images.

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“…This group includes crankshafts of power engines of a ship's main propulsion machinery as well as auxiliary engines and generator sets. The accuracy of crankshafts [1][2][3][4][5] largely determines the correct functioning of the crank-piston system and, as a result, of the whole working machine [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Determination of Geometrical Deviations of Large-Size Crankshafts with Limited Detection Possibilities Resulting from the Assumed Measuring Conditions

et al. 2023

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This article deals with the geometrical deviation measurements of crankshafts of large marine engines fuelled with conventional or alternative fuels, taking into account the problem of their deformability. Since the detectability of geometrical deviations of a crankshaft supported by prisms depends largely on the support conditions assumed and the parameters of the method, the study was carried out for two cases of crankshaft support. The first case concerned measurements of the main journals of a crankshaft seated on a set of supports pre-positioned at an equal height. In contrast, the second case involved measurements of the main journals of a crankshaft seated on supports pre-positioned at various heights. In particular, the research focused on evaluating the effect of sensor location angle on the results of measurements of deviations and contour profiles of the crankshaft main journal system. The results of the research are the developed procedures, the application of which in practical measurements under workshop conditions, where there is no access to coordinate measuring machines, enables correct interpretation of the measurement results and evaluation of the geometrical state of the measured crankshaft.

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Precision Measurement Method of Large Shaft Diameter Based on Dual Camera System

Cited by 7 publications

References 27 publications

Design of an Imaging Optical System for Large-Sized Stepped Shaft Diameter Detection

Design of an Imaging Optical System for Large-Sized Stepped Shaft Diameter Detection

A Method for Measuring Shaft Diameter Based on Light Stripe Image Enhancement

Determination of Geometrical Deviations of Large-Size Crankshafts with Limited Detection Possibilities Resulting from the Assumed Measuring Conditions

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