- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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Design and fabrication of a high-precision 360?° laser receiver for leveling applications
摘要： The laser technique based sensors and actuators can provide many superior properties as noncontact, high sensitivity, remote operation, and reliable performance in contrast to other mechanical and electrical techniques. In this paper, we design and fabricate a high-precision 360(cid:1) laser receiver for leveling, especially for agricultural and construction field. The laser receiver is primarily composed of photoelectrical conversion module, electrical signal processing module, and display panel module. Based on the centroid method, the detection error of the laser receiver with respect to laser source and silicon photocell array, is analyzed and simulated. The design and fabrication process are described in detail, including the overall structure and electrical circuits. Furthermore, this fabricated laser receiver is demonstrated to be high precision through several static and dynamic tests in the distance of 10 and 50 m. Besides, this fabricated laser possesses wireless transmission function, which provides much convenient for users in remote operation.
关键词： leveling,silicon photocell,laser receiver,centroid method
更新于2025-09-23 15:21:01
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Mixed Centroid Method for Spaceborne Laser Altimeter Calibration
摘要： The on-orbit calibration of spaceborne laser altimeters is based on traditional geometric calibration in which the laser pointing angle error is the primary evaluation index. This study proposes a mixed centroid method for calculating the laser footprint center by using the geometric center of each energy level eliminating the abnormal energy level points, inverting the laser energy level distribution, and correcting the true footprint. Then, the mixed centroid method is compared with the traditional geometric center method and the centroid method. Simulation comparisons demonstrate that the proposed method offers high precision and low calibration cost, thereby improving the calibration accuracy of the target. The proposed method provides a reference algorithm for the ground field calibration of the next generation of high-resolution mapping satellites in China.
关键词： Mixed centroid method,Calibration,Centroid method,Pointing angle error,Geometric center method
更新于2025-09-16 10:30:52
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AIP Conference Proceedings [Author(s) SolarPACES 2017: International Conference on Concentrating Solar Power and Chemical Energy Systems - Santiago, Chile (26–29 September 2017)] - Threshold effect on particle tracking algorithms
摘要： Automated particle tracking algorithms are widely used by soft matter physicists as a research tool to detect and construct the trajectories of micron-sized particles in ?uids. Analyzing these trajectories will uncover the physics of the investigated particles mainly on the type of motion they undergo making them suitable for potential applications. A plethora of methods has been proposed and used for detection and tracking. In this work, we examine the performance of two commonly used tracking algorithms in terms of threshold dependencies in digital video images. One of them is the centroid method (CM), a well-known and used algorithm and the other is radial symmetry method (RSM) which is recently proposed. Here, we generate the synthetic digital video images consisting of randomly placed multiple particles and compare the absolute errors on the particle detection by varying threshold values. Our results suggest that both algorithms show dependence on the threshold value and on comparison RSM algorithm performs better than the CM algorithm when the noise level is zero. Moreover, the measured absolute errors show a strong dependence on threshold values when noise levels are increased (up to 20) especially for the RSM algorithm.
关键词： centroid method,radial symmetry method,particle tracking algorithms,threshold dependencies,digital video images
更新于2025-09-04 15:30:14