A Fast and in-Situ Measuring Method Using Laser Triangulation Sensors for the Parameters of the Connecting Rod

Li, Xingqiang; Zhong, Wang; Fu, Lei

doi:10.3390/s16101679

Cited by 7 publications

(4 citation statements)

References 21 publications

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“…The measuring range of the leaser displacement sensors cannot be too large, because the measurement accuracy has to be maintained. Our research group had proposed a method to solve this problem by increasing the number of sensors [ 24 ], but this method might cause the measuring device volume to be too large and decrease the generality of the device. In order to increase the measuring range with a lower sensors number, this paper proposes a new kind of device.…”

Section: Calibration Modelmentioning

confidence: 99%

Calibration of Laser Beam Direction for Inner Diameter Measuring Device

Yang

Zhong

et al. 2017

Sensors

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Abstract:The laser triangulation method is one of the most advanced methods for large inner diameter measurement. Our research group proposed a kind of inner diameter measuring device that is principally composed of three laser displacement sensors known to be fixed in the same plane measurement position. It is necessary to calibrate the direction of the laser beams that are emitted by laser displacement sensors because they do not meet the theoretical model accurately. For the purpose of calibrating the direction of laser beams, a calibration method and mathematical model were proposed. The inner diameter measuring device is equipped with the spindle of the machine tool. The laser beams rotate and translate in the plane and constitute the rotary rays which are driven to scan the inner surface of the ring gauge. The direction calibration of the laser beams can be completed by the sensors' distance information and corresponding data processing method. The corresponding error sources are analyzed and the validity of the method is verified. After the calibration, the measurement error of the inner diameter measuring device reduced from ±25 µm to ±15 µm and the relative error was not more than 0.011%.

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Section: Calibration Modelmentioning

confidence: 99%

Calibration of Laser Beam Direction for Inner Diameter Measuring Device

Yang

Zhong

et al. 2017

Sensors

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“…Eddy current [8], spherical dispersed electric field [9], structured light [10,11], interferometric [12][13][14], and laser triangulation methods [15,16] are examples of noncontact inner diameter measuring techniques. Because of the advantages of assuring high-precision measurements, the use of dispersive confocal methods to tiny displacement and morphological studies has recently become a research hotspot.…”

Section: Introductionmentioning

confidence: 99%

A High-Precision and Wide Range Method for Inner Diameter Measurement

et al. 2022

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Inner diameter measurement technology with high precision and wide measuring ranges is a difficult area to master. It is challenging to achieve high precision and a wide measuring range for inner diameter measurement. The dispersive confocal technique is used to describe a high accuracy, large range approach for measuring inner diameter. The inner diameter is measured utilizing a rotating scanning approach that combines the dispersive confocal technique with least squares. Meanwhile, a plane mirror deflects the optical path of a dispersive confocal sensor, focusing monochromatic light of a certain wavelength on the object’s surface in the radial direction. The measuring range of the device may be modified to fit different objects by modifying the distance between the dispersive confocal sensor and the plane mirror, as well as the eccentricity of the dispersive confocal sensor. Furthermore, this study examines the method’s accuracy and suggests a calibration technique. As a consequence, the procedure may ensure measurement precision as well as a measurement range. Finally, experiments are utilized to test the validity of the strategy. To accomplish a 3 μm inner diameter measurement precision and a measuring range of 76 mm to 150 mm, a dispersive confocal sensor with a range of just 20 mm was utilized.

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“…In non-contact measurement, the laser displacement sensor is widely used in the fields of reverse engineering and accuracy measurement by virtue of its advantages of high measurement accuracy, wide measurement range, easy integration with a computer to form an intelligent testing system, and ability to conduct online testing at a production site [ 6 ]. Li et al adopted multiple laser displacement sensor arrays to realize the on-line in-situ testing of important parameters of automotive engine cabinets and connecting rods [ 7 , 8 ]; Wang et al applied the laser displacement sensor to the dimension measurement of coaxial holes and then verified by experiment that the new testing method is both rapid and effective [ 9 ]; An automatic measuring system for the dimensions of the internal holes of long-stepped pipes based on the laser displacement sensor was designed [ 10 ]; Chen et al researched a non-contact pulse automatic positioning measurement system for traditional Chinese medicine in combination with the advantages of optical measurement and computer automation [ 11 ]. However, the said research all lacks the error compensation and reconstruction of the data acquired by a laser displacement sensor, resulting in unsatisfactory measurement results.…”

Section: Introductionmentioning

confidence: 99%

A Fast and On-Machine Measuring System Using the Laser Displacement Sensor for the Contour Parameters of the Drill Pipe Thread

Dong

Sun

Chen

et al. 2018

Sensors

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The inconvenient loading and unloading of a long and heavy drill pipe gives rise to the difficulty in measuring the contour parameters of its threads at both ends. To solve this problem, in this paper we take the SCK230 drill pipe thread-repairing machine tool as a carrier to design and achieve a fast and on-machine measuring system based on a laser probe. This system drives a laser displacement sensor to acquire the contour data of a certain axial section of the thread by using the servo function of a CNC machine tool. To correct the sensor’s measurement errors caused by the measuring point inclination angle, an inclination error model is built to compensate data in real time. To better suppress random error interference and ensure real contour information, a new wavelet threshold function is proposed to process data through the wavelet threshold denoising. Discrete data after denoising is segmented according to the geometrical characteristics of the drill pipe thread, and the regression model of the contour data in each section is fitted by using the method of weighted total least squares (WTLS). Then, the thread parameters are calculated in real time to judge the processing quality. Inclination error experiments show that the proposed compensation model is accurate and effective, and it can improve the data acquisition accuracy of a sensor. Simulation results indicate that the improved threshold function is of better continuity and self-adaptability, which makes sure that denoising effects are guaranteed, and, meanwhile, the complete elimination of real data distorted in random errors is avoided. Additionally, NC50 thread-testing experiments show that the proposed on-machine measuring system can complete the measurement of a 25 mm thread in 7.8 s, with a measurement accuracy of ±8 μm and repeatability limit ≤ 4 μm (high repeatability), and hence the accuracy and efficiency of measurement are both improved.

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A Fast and in-Situ Measuring Method Using Laser Triangulation Sensors for the Parameters of the Connecting Rod

Cited by 7 publications

References 21 publications

Calibration of Laser Beam Direction for Inner Diameter Measuring Device

Calibration of Laser Beam Direction for Inner Diameter Measuring Device

A High-Precision and Wide Range Method for Inner Diameter Measurement

A Fast and On-Machine Measuring System Using the Laser Displacement Sensor for the Contour Parameters of the Drill Pipe Thread

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