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Adaptive sampling for corrugated plate digitization using a laser displacement sensor

Science China(Technological Sciences) 2024年第5期67卷 1510-1523页

作者： WU ChengXing QI Qi CHEN BaiJin YANG JiXiang DING Han State Key Laboratory of Intelligent Manufacturing Equipment and Technology School of Mechanical Science and EngineeringHuazhong University of Science and TechnologyWuhan430074China State Key Laboratory of Intelligent Manufacturing Equipment and Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan430074China

The surface quality of a corrugated plate directly determines the heat transfer property of the thermal power mechanical *** detection methods are impractical for real-world production,being slow and *** contrast,the point laser displacement sensor,employing the optical triangle method,emerges as a promising device for assessing parts with variable curvature and highly reflective *** its benefits,high-density sampling by an innate frequency introduces challenges such as data redundancy and a poor signal-to-noise ratio,potentially affecting the efficiency and precision of subsequent data *** address these challenges,adjustable frequency data sampling has been developed for this sensor,allowing adaptive sampling for corrugated plate *** process begins with surface digitization to extract discrete points,which are transformed into intersection curves using the B-spline fitting ***,dominant points are identified,considering multigeometric constraints for curvature and arch ***,the sampling signal is adjusted based on the distribution information of dominant *** results indicate that the proposed method effectively minimizes redundant sampling without compromising the accurate capture of essential geometric features.

关键词： corrugated plate laser displacement sensor adaptive sampling dominant point curvature arch height

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Novel, High-Precision, On-Machine Approach for Measuring Cup Grinding Wheel Wear Using a Moveable laser displacement sensor

JOURNAL OF MANUFACTURING AND MATERIALS PROCESSING

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JOURNAL OF MANUFACTURING AND MATERIALS PROCESSING 2025年第4期9卷 122-122页

作者： Wang, Chung-Ying Huang, Chien-Yao Chiang, Yen-Han Natl Inst Appl Res Natl Ctr Instrumentat Res Hsinchu 30076 Taiwan Natl Inst Appl Res Natl Ctr High Performance Comp Hsinchu 30076 Taiwan

This study developed a movable, high-precision laser measurement system for assessing wear on cup grinding wheels. The proposed setup employs a Keyence CL-P070 laser sensor with a resolution of 0.25 mu m and has a simple installation process that supports flexible deployment on multiple workstations. Unlike traditional static configurations, the compact design requires minimal adjustment and enables versatile positioning across operational environments. An automated measurement procedure was developed that can capture changes in the grinding wheel profile between grinding cycles. The experimental results indicate that the proposed system has high repeatability and accuracy in detecting the subtle progression of wear in cup grinding wheels. The proposed approach provides a user-friendly on-machine measurement solution that can improve quality control and operational efficiency in industrial grinding processes.

关键词： cup grinding wheel wear on-machine measurement laser displacement sensor automated wear analysis

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IABC: An iteratively automatic machine learning boosted hand-eye calibration method for laser displacement sensor

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Chinese Journal of Aeronautics 2023年第8期36卷 422-453页

作者： Helin LI Bin LIN Tianyi SUI Liang XU Chen ZHANG Shuai YAN Yang WANG Xinquan HAO Deyu LOU School of Mechanical Engineering Ministry of EducationTianjin UniversityTianjin 300350China International Institute for Innovative Design and Intelligent Manufacturing of Tianjin University Shaoxing 312000China Science and Technology of Advanced Functional Composite Laboratory Aerospace Research Institute of Materials and Processing TechnologyBeijing 100076China Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education Tianjin UniversityTianjin 300072China

An on-machine measuring(OMM)system with a laser displacement sensor(LDS)is designed for measuring free-form surfaces of hypersonic aircraft’s *** improve the measurement accuracy of the OMM system,a novel Iteratively Automatic machine learning Boosted hand-eye Calibration(IABC)method is *** the hand-eye relationship and LDS measurement errors can be calibrated in one calibration process without any hardware changes via ***,a new objective function is derived,containing analytical parameters of the handeye relationship and LDS ***,a hybrid calibration model composed of two kernels is proposed to solve the objective *** kernel is the analytical kernel designed for solving analytical *** kernel is the automatic machine learning(AutoML)kernel designed to model LDS *** two kernels are connected with stepwise iterations to find the best calibration *** with traditional methods,hand-eye experiments show that IABC reduces the calibration RMSE by about 50%.Verification experiments show that IABC reduces the measurement deviations by about 25%-50%and RMSEs within 40%.Even when the training data are obviously less than the test data,IABC performs *** demonstrate that IABC is more accurate than traditional hand-eye methods.

关键词： Hand-Eye Calibration laser displacement sensor Machine learning Measurement errors On-Machine Measurement

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A Three-Dimensional Method for Analysis of the Body Mode of Classical Guitars Using a laser displacement sensor

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sensorS 2024年第16期24卷 5147页

作者： Su, Kuan-Cheng Hsieh, Tsung-Yu Lin, Wei-Chih Hsiao, Fu-Li Ryzhkova, Tatyana Chen, Chii-Chang Natl Cent Univ Dept Opt & Photon Taoyuan 320 Taiwan Natl Changhua Univ Educ Inst Photon Changhua 500 Taiwan Sudweyher Str 13 D-28857 Syke Germany

In classical guitar acoustic spectra, the lowest frequency body mode's amplitude often significantly surpasses that of the string overtones. However, the characteristics of the body mode have not been systematically utilized to quantitatively represent the timbre of classical guitars. In this study, we propose a quantitative method for describing the body mode, which can effectively differentiate the timbre of classical guitars. Our approach involves three key parameters presented in a three-dimensional space, as follows: the frequency and quality factors of the body mode, along with the amplitude ratio of the plucked string note to the body mode in the soundboard's vibration spectrum. This representation allows for the visualization, quantitative comparison, and classification of the body mode note and damping properties across classical guitars. The differences in body mode among guitars can be analyzed quantitatively using Euclidean distance.

关键词： body mode acoustic spectra laser displacement sensor timbre classical guitars

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A novel blood volume monitoring approach in a venous reservoir using a laser displacement sensor for blood surface distance measurement

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JOURNAL OF ARTIFICIAL ORGANS 2025年 1-9页

作者： Fukuhara, Shinichi Yamamoto, Ken-ichiro Kawasaki Univ Med Welf Fac Hlth Sci & Technol Dept Med Engn 288 Matsushima Kurashiki Okayama 7010193 Japan

A venous reservoir (VR) is crucial for safe blood volume regulation during cardiopulmonary bypass (CPB) procedures. Currently, blood volume measurement in VRs relies heavily on visual inspection, which limits its accuracy and responsiveness. In this paper, a method that leverages a laser displacement sensor for blood surface distance change detection in VRs with high accuracy and simplicity is proposed. It enables precise, non-contact, real-time measurements for displacement and position analysis of blood surface. Hard-shell VRs maintain a constant relationship between blood volume and blood surface height. Therefore, we measured the blood surface distance and the distance between the sensors. The findings of this study demonstrate that blood volume correlates with the distance measured from the blood surface to the sensor, showing clear "blood surface distance-volume characteristic" curves specific to each VR. Experimental results confirm excellent reproducibility and low variability, even under different conditions, such as blood dilution and varying ambient light. In addition, the blood volume dynamic behavior during CPB can be captured with measurements that are in good agreement with theoretical predictions. Our findings confirm the potential of blood volume estimation based on blood surface distance measurements, making it a promising alternative for real-time blood volume monitoring during CPB. Integrating this method into CPB systems could improve safety, prevent air embolisms, and improve fluid management, paving the way for more precise and automated circulating blood volume control.

关键词： Cardiopulmonary bypass laser displacement sensor Venous reservoir Blood volume Real-time monitoring

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Design and calibration of a three-dimensional localization system for automatic measurement of long and thin tube based on camera and laser displacement sensor

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PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE 2021年第7期235卷 1193-1210页

作者： Li, Ruifeng Zhuang, Jinlei Gao, Yunfeng Cao, Chuqing Wang, Ke Harbin Inst Technol State Key Lab Robot & Syst Harbin Heilongjiang Peoples R China Wuhu HIT Robot Technol Res Inst Co Ltd Wuhu Peoples R China

An integrated system consisting of robot and laser scanner is considered as a promising alternative measurement device for three-dimensional tube which is long and thin. A key to achieving automatic measurement is to locate tube accurately and robustly, which is precondition for scanning path planning. Thus, a novel three-dimensional localization system consisting of camera and laser displacement senor is proposed. When fixed on robot, the camera can search tube quickly in large view and the laser displacement sensor obtains depth information of key points. Measurement principles are presented firstly, including four main steps: camera shooting, key points extraction, laser displacement sensor shooting, and coordinate calculation. Then, the location error influenced by parameters of camera model and laser displacement sensor is analyzed and illustrated by a specific camera and laser displacement sensor. Furthermore, a scan strategy is proposed for quite thin tube localization. Location error caused by perspective is also analyzed and a compensation method is proposed for decreasing the error. Additionally, a sensor transformation calibration method is presented for identifying the relationship between camera and laser displacement sensor, which is verified with high accuracy by calibration experiments. A contrast experiment of a cylinder bar localization shows that the maximum location error of the camera and laser displacement sensor is no more than 3.5 mm, which is only one-eighth of that of Kinect sensor. The mean and maximum location errors are within 2 mm and 3 mm when locating a car brake and fuel tube with about 1300 mm long, indicating high accuracy and good robustness of designed localization system.

关键词： Tube three-dimensional localization system laser displacement sensor camera articulated robot

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Detection and Analysis of Pavement-Section Based on laser displacement sensor

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sensorS 2023年第15期23卷 6758-6758页

作者： Han, Jin Xiong, Gao Liu, Jia Shaanxi Univ Technol Sch Mech Engn Hanzhong 723001 Peoples R China

The section detection of the pavement is the data basis for measuring the road smoothness, rutting, lateral slope, and structural depth. The detection of the Pavement-Section includes longitudinal-section inspection and cross-section inspection. In this paper, based on multiple laser displacement sensors, fused accelerometers and attitude sensors, and using vehicle-mounted high-speed detection, we design a sensor-fused pavement section data acquisition method, establish the relevant mathematical model, and realize the automatic acquisition of pavement longitudinal and transverse sections. The acceleration sensor is filtered to improve the accuracy of data acquisition, and the error of the detection system is calculated and analyzed. Through the actual measurement, the vehicle-mounted high-speed pavement profile detection method adopted in this paper can not only accurately detect the profile of the pavement profile, but also improve the detection efficiency, providing a cost-effective detection mode for road surface detection.

关键词： laser displacement sensor vehicle-mounted high-speed detection sensor fusion section detection filter processing

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Analysis of implant stability changes in immediate loading using a laser displacement sensor in vivo and comparison of its sensitivity with that of resonance frequency analysis

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CLINICAL ORAL IMPLANTS RESEARCH 2021年第11期32卷 1341-1356页

作者： Murakami, Kazuhiro Yamamoto, Kazuhiko Ishida, Junichi Tsutsumi, Sadami Kirita, Tadaaki Nara Med Univ Dept Oral & Maxillofacial Surg 840 Shijo Cho Kashihara Nara 6348522 Japan Kanazawa Inst Technol Appl Elect Lab Kanazawa Ishikawa Japan

Objective The aim of this study was to analyze the stability changes in immediately loaded implants by using an in vivo quantitative measurement of micromotion under functional dynamic loading and to verify the sensitivity of Resonance Frequency Analysis (RFA) as compared to that of actual micromotion. Materials and methods The micromotions of immediately loaded implants placed in the tibia of 11 rabbits were monitored using a laser displacement sensor. Functional dynamic loading forces were applied 5 days a week for 6 weeks. The implant stability quotient (ISQ) was monitored using RFA. Results The micromotion of the almost-loaded implants increased to peak values the day after loading was started and subsequently reached a plateau gradually. The ISQ changes in the loaded implants closely correlated with the alterations of the actual micromotion (r = -0.98, p < .01). Although the ISQ value itself correlated with the measured micromotion at the time of initial fixation (r = 0.73, p < .05), it did not correlate with the micromotion of the implant that acquired integration. No close correlation was observed between the ISQ and the histomorphometrical data. Conclusion The immediately loaded implants showed the lowest stability immediately after the start of loading, which gradually increased thereafter. RFA is considered a useful method for examining stability changes and initial stability;however, it cannot determine the absolute magnitude of the stability after integration.

关键词： bone histomorphometrical analysis dental implants immediate loading laser displacement sensor micromotion osseointegration rabbit resonance frequency analysis

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laser displacement sensor Optimization for Space Structure Vacuum Thermal Test

Laser Displacement Sensor Optimization for Space Structure V...

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International Conference on Optical Instruments and Technology (OIT) - Optoelectronic Measurement Technology and Systems

作者： Fan Chao Gao Wen Bi Yanqiang Wang Jing Lin Boying Li Xiyuan Liu Guoqing Beijing Inst Spacecraft Environm Engn Beijing 100094 Peoples R China Natl Key Lab Sci & Technol Reliabil & Technol Rel Beijing 100094 Peoples R China

ISBN: (纸本)9781510636576

The large spacecraft structure would generate thermal-induced vibration in orbit under specific condition, which will affect the performance of the payload. In order to predict the occurrence of thermal-induced vibration of the spacecraft structure in orbit, it is necessary to carry out tests in the ground simulated vacuum and low temperature environment. The vibration displacement of structure should be measured by laser displacement meter during the test. Due to the special environment such as vacuum, low temperature environment, it is necessary to improve the laser displacement meter. The effect of internal and external pressure difference during pumping is eliminated by design the venting holes. Ensures the temperature uniformity and operating temperature range of the laser displacement meter by thermal control design, to reduce the measurement error caused by the thermal deformation of the sensor. The adaptive design ensures that the laser displacement meter can work normally under vacuum and low temperature environment, and the measurement accuracy is better than 5 mu m.

关键词： Thermally Induced Vibration (TIV) space structure laser displacement sensor optimization

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A Position and Attitude Measurement Method Based on laser displacement sensor and Infrared Vision Camera

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IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT 2022年 71卷 1页

作者： Li, Zhenxing Pei, Yongchen Qu, Chuan Yang, Fan Jilin Univ Sch Mech & Aerosp Engn Changchun 130022 Jilin Peoples R China

The position and attitude measurement of objects plays an important role in industrial manufacture and inspection. However, in the existing measurement methods, the challenges brought by the environmental uncertainty to the visual measurement algorithm and the coordinate conversion errors caused by the joint measurement of various precision equipment will lead to poor accuracy and stability. In this article, a measurement method is proposed to measure the object's position and attitude based on laser displacement sensor and infrared vision camera. First, when measuring the position and attitude, the combination of infrared vision camera and measurement target is an effective method to solve the challenges brought by environmental changes and measurement target changes in visual measurement methods. In addition, the measurement results and data of the whole system need not be converted between multiple coordinate systems, which avoid the complexity of system calculation and coordinate conversion errors. Through position and attitude measuring experiments, the position measurement error is 2.6 mm and the attitude angle measurement error is 1.1 degrees, which verifies the feasibility and stability of the method.

关键词： Position measurement Measurement by laser beam Coordinate measuring machines Cameras displacement measurement Measurement uncertainty Transmission line measurements Infrared vision camera laser displacement sensor measurement target plane fitting position and attitude

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