- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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Stereovision monitoring of deflection of concrete beam strengthened with ultraviolet-cured glass-fiber reinforced polymer in a destructive test
摘要： To monitor three-dimensional structural displacements in civil engineering, a stereovision displacement measurement method based on structure coordinate system is proposed in the present paper, and the absolute displacements of structure can be obtained through establishing the structure coordinate system and coordinate transformation. The center identification algorithm for circular target is studied to acquire the subpixel coordinates of center by combining Canny algorithm and Zernike algorithm. The epipolar constraint is introduced to conduct stereo matching of initial image pairs, and Kalman filtering and neighborhood searching algorithm are both employed to track circular targets on the left and right sequence images. To validate the effectiveness of the proposed method, a destructive test of concrete beams strengthened with ultraviolet-cured glass fiber reinforced polymer is performed in lab. Results show that the load–displacement curves obtained by the proposed stereovision method and linear variable differential transformer agree with each other; this verifies that the proposed stereovision method is feasible and effective for monitoring structural displacement in a destructive test.
关键词： Structural health monitoring,stereovision,computer vision,displacement measurement
更新于2025-09-23 15:22:29
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A three-step displacement measurement method for a 3-DOF macro-micro positioning stage
摘要： A high-performance displacement measurement method for the displacement measurement of a three degree of freedom (3-DOF) macro-micro positioning stage based on the micro-vision measurement system is proposed. The method is built up by three steps. In the first step, a fast search algorithm combined with triangular relations and a ring projection with illumination and noise correction is adopted to achieve the selection of candidate pixels. Subsequently, an orientation code based algorithm is adopted to determine the integer-pixel displacement and rotation angle estimation. The third step is to obtain the sub-pixel displacement through a similarity function based algorithm. Simulations are carried out, and the results show that the proposed method has the characteristics of translation and rotation invariance, and the matching accuracy can reach 0.01-pixel theoretically. Moreover, the proposed method consumes less time than that of the orientation code and pseudo-Zernike moment based algorithm. Finally, a capacitance sensor measurement system is established to compare the accuracy of the proposed method. The experiment results demonstrate that it has a high accuracy.
关键词： sub-pixel displacement,orientation code,displacement measurement,macro-micro positioning stage,micro-vision measurement system
更新于2025-09-23 15:21:21
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[IEEE 2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall) - Xiamen, China (2019.12.17-2019.12.20)] 2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall) - Detection of Weak Strain and Vibration Signal at Multipoints of a Bridge with Optical Fiber Bragg Gratings
摘要： In this paper, we present a new method for detecting in-plane displacements in microelectromechanical systems (MEMS) with an unprecedented sub-?ngstr?m accuracy. We use a curve-fitting method that is commonly employed in spectroscopy to find peak positions in a spectrum. We fit a function to the intensity profile of the image of a silicon beam that was captured with a CCD camera on an optical microscope. The position resolution depends on the amount of pixel noise and on how the moving feature is spread across the detector pixels. The resolution is usually limited by photon shot noise, which can be controlled and lowered in several ways. To demonstrate the technique we measure the adhesion snap-off of two silicon surfaces. We assess the accuracy of the technique using two different silicon MEMS devices and an experimental ultrananocrystalline diamond device. The lowest position noise that we report is obtained by summing 1 577 image lines and is as low as 60 pm [2014-0040] root mean square.
关键词： Displacement measurement,optical noise,MEMS,optical image processing,subpixel resolution,optical position measurement
更新于2025-09-23 15:19:57
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[IEEE 2019 International Conference on Communication and Electronics Systems (ICCES) - Coimbatore, India (2019.7.17-2019.7.19)] 2019 International Conference on Communication and Electronics Systems (ICCES) - Internet of Things (IoT) enabled Sustainable Home Automation along with Security using Solar Energy
摘要： This paper presents a novel method for tracking the position of a medical instrument’s tip. The system is based on phase locking a high frequency signal transmitted from the medical instrument’s tip to a reference signal. Displacement measurement is established having the loop open, in order to get a low frequency voltage representing the medical instrument’s movement; therefore, positioning is established by means of conventional measuring techniques. The voltage-controlled oscillator stage of the phase-locked loop (PLL), combined to an appropriate antenna, comprises the associated transmitter located inside the medical instrument tip. All the other low frequency PLL components, low noise amplifier and mixer, are located outside the human body, forming the receiver part of the system. The operating details of the proposed system were coded in Verilog-AMS. Simulation results indicate robust medical instrument tracking in 1-D. Experimental evaluation of the proposed position tracking system is also presented. The experiments described in this paper are based on a transmitter moving opposite a stationary receiver performing either constant velocity or uniformly accelerated movement, and also together with two stationary receivers performing constant velocity movement again. This latter setup is implemented in order to demonstrate the prototype’s accuracy for planar (2-D) motion measurements. Error analysis and time-domain analysis are presented for system performance characterization. Furthermore, preliminary experimental assessment using a saline solution container to more closely approximate the human body as a radio frequency wave transmission medium has proved the system’s capability of operating underneath the skin.
关键词： radio frequency (RF),Displacement measurement,position tracking,medical instrument,phase shift
更新于2025-09-23 15:19:57
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[IEEE 2018 11th UK-Europe-China Workshop on Millimeter Waves and Terahertz Technologies (UCMMT) - HangZhou, China (2018.9.5-2018.9.7)] 2018 11th UK-Europe-China Workshop on Millimeter Waves and Terahertz Technologies (UCMMT) - Efficient Calculation of Input Impedance of Dipole Antennas
摘要： In this paper, we present a new method for detecting in-plane displacements in microelectromechanical systems (MEMS) with an unprecedented sub-?ngstr?m accuracy. We use a curve-fitting method that is commonly employed in spectroscopy to find peak positions in a spectrum. We fit a function to the intensity profile of the image of a silicon beam that was captured with a CCD camera on an optical microscope. The position resolution depends on the amount of pixel noise and on how the moving feature is spread across the detector pixels. The resolution is usually limited by photon shot noise, which can be controlled and lowered in several ways. To demonstrate the technique we measure the adhesion snap-off of two silicon surfaces. We assess the accuracy of the technique using two different silicon MEMS devices and an experimental ultrananocrystalline diamond device. The lowest position noise that we report is obtained by summing 1 577 image lines and is as low as 60 pm [2014-0040] root mean square.
关键词： MEMS,Displacement measurement,optical image processing,optical noise,subpixel resolution,optical position measurement
更新于2025-09-19 17:13:59
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Generating High-Power Continuous-Frequency Tunable Sub-Terahertz Radiation from a Quasi-optical Gyrotron with Confocal Waveguide
摘要： In this paper, we present a new method for detecting in-plane displacements in microelectromechanical systems (MEMS) with an unprecedented sub-?ngstr?m accuracy. We use a curve-fitting method that is commonly employed in spectroscopy to find peak positions in a spectrum. We fit a function to the intensity profile of the image of a silicon beam that was captured with a CCD camera on an optical microscope. The position resolution depends on the amount of pixel noise and on how the moving feature is spread across the detector pixels. The resolution is usually limited by photon shot noise, which can be controlled and lowered in several ways. To demonstrate the technique we measure the adhesion snap-off of two silicon surfaces. We assess the accuracy of the technique using two different silicon MEMS devices and an experimental ultrananocrystalline diamond device. The lowest position noise that we report is obtained by summing 1 577 image lines and is as low as 60 pm [2014-0040] root mean square.
关键词： subpixel resolution,MEMS,optical position measurement,optical noise,Displacement measurement,optical image processing
更新于2025-09-19 17:13:59
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[IEEE 2019 5th International Conference on Advances in Electrical Engineering (ICAEE) - Dhaka, Bangladesh (2019.9.26-2019.9.28)] 2019 5th International Conference on Advances in Electrical Engineering (ICAEE) - Structural properties of bi-layer Molybdenum Thin-film deposited by RF magnetron sputtering for CZTS solar cells
摘要： This paper presents a novel method for tracking the position of a medical instrument’s tip. The system is based on phase locking a high frequency signal transmitted from the medical instrument’s tip to a reference signal. Displacement measurement is established having the loop open, in order to get a low frequency voltage representing the medical instrument’s movement; therefore, positioning is established by means of conventional measuring techniques. The voltage-controlled oscillator stage of the phase-locked loop (PLL), combined to an appropriate antenna, comprises the associated transmitter located inside the medical instrument tip. All the other low frequency PLL components, low noise amplifier and mixer, are located outside the human body, forming the receiver part of the system. The operating details of the proposed system were coded in Verilog-AMS. Simulation results indicate robust medical instrument tracking in 1-D. Experimental evaluation of the proposed position tracking system is also presented. The experiments described in this paper are based on a transmitter moving opposite a stationary receiver performing either constant velocity or uniformly accelerated movement, and also together with two stationary receivers performing constant velocity movement again. This latter setup is implemented in order to demonstrate the prototype’s accuracy for planar (2-D) motion measurements. Error analysis and time-domain analysis are presented for system performance characterization. Furthermore, preliminary experimental assessment using a saline solution container to more closely approximate the human body as a radio frequency wave transmission medium has proved the system’s capability of operating underneath the skin.
关键词： radio frequency (RF),Displacement measurement,position tracking,medical instrument,phase shift
更新于2025-09-19 17:13:59
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[IEEE 2019 International Conference on Power Electronics Applications and Technology in Present Energy Scenario (PETPES) - Mangalore, India (2019.8.29-2019.8.31)] 2019 International Conference on Power Electronics Applications and Technology in Present Energy Scenario (PETPES) - Performance Comparison of Root-finding Algorithms for Solar Photovoltaic Emulator
摘要： This paper presents a novel method for tracking the position of a medical instrument’s tip. The system is based on phase locking a high frequency signal transmitted from the medical instrument’s tip to a reference signal. Displacement measurement is established having the loop open, in order to get a low frequency voltage representing the medical instrument’s movement; therefore, positioning is established by means of conventional measuring techniques. The voltage-controlled oscillator stage of the phase-locked loop (PLL), combined to an appropriate antenna, comprises the associated transmitter located inside the medical instrument tip. All the other low frequency PLL components, low noise amplifier and mixer, are located outside the human body, forming the receiver part of the system. The operating details of the proposed system were coded in Verilog-AMS. Simulation results indicate robust medical instrument tracking in 1-D. Experimental evaluation of the proposed position tracking system is also presented. The experiments described in this paper are based on a transmitter moving opposite a stationary receiver performing either constant velocity or uniformly accelerated movement, and also together with two stationary receivers performing constant velocity movement again. This latter setup is implemented in order to demonstrate the prototype’s accuracy for planar (2-D) motion measurements. Error analysis and time-domain analysis are presented for system performance characterization. Furthermore, preliminary experimental assessment using a saline solution container to more closely approximate the human body as a radio frequency wave transmission medium has proved the system’s capability of operating underneath the skin.
关键词： radio frequency (RF),medical instrument,Displacement measurement,phase shift,position tracking
更新于2025-09-19 17:13:59
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Single-Mode 940 nm VCSELs With Narrow Divergence Angles and High-Power Performances for Fiber and Free-Space Optical Communications
摘要： This paper presents a novel method for tracking the position of a medical instrument’s tip. The system is based on phase locking a high frequency signal transmitted from the medical instrument’s tip to a reference signal. Displacement measurement is established having the loop open, in order to get a low frequency voltage representing the medical instrument’s movement; therefore, positioning is established by means of conventional measuring techniques. The voltage-controlled oscillator stage of the phase-locked loop (PLL), combined to an appropriate antenna, comprises the associated transmitter located inside the medical instrument tip. All the other low frequency PLL components, low noise amplifier and mixer, are located outside the human body, forming the receiver part of the system. The operating details of the proposed system were coded in Verilog-AMS. Simulation results indicate robust medical instrument tracking in 1-D. Experimental evaluation of the proposed position tracking system is also presented. The experiments described in this paper are based on a transmitter moving opposite a stationary receiver performing either constant velocity or uniformly accelerated movement, and also together with two stationary receivers performing constant velocity movement again. This latter setup is implemented in order to demonstrate the prototype’s accuracy for planar (2-D) motion measurements. Error analysis and time-domain analysis are presented for system performance characterization. Furthermore, preliminary experimental assessment using a saline solution container to more closely approximate the human body as a radio frequency wave transmission medium has proved the system’s capability of operating underneath the skin.
关键词： position tracking,Displacement measurement,phase shift,radio frequency (RF),medical instrument
更新于2025-09-19 17:13:59
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Flexible Linear and Angular Displacement Sensor Based on a Gradient Guided-Mode Resonance Filter
摘要： This paper reports a method for micrometer-scale linear and angular displacement measurement based on a gradient grating period guided-mode resonance (GGP-GMR) filter. When the filter is mounted on a moving or rotating object, the displacement on the object can be observed through the changes in the resonant wavelength, which are detected by the GGP-GMR filter. In this paper, the GGP-GMR filter comprised grating periods from 250 to 550 nm with 2-nm increments. Each period comprised 100 repeated cycles, resulting in a total length of 6 mm. For linear displacement, we achieved an average sensitivity of 67 nm/mm for a detection range of 6 mm and a theoretical limit of detection of 3 μm. To demonstrate the measurement of angular displacement, the GGP-GMR filter was attached to a cylinder with a diameter of 8 cm. The experimental results revealed an average sensitivity of 51.7 nm/° for a range of 7° and an experimental limit of detection of 0.002°.
关键词： sensor,guided-mode resonance,subwavelength structure,bandstop filter,Displacement measurement
更新于2025-09-10 09:29:36