Renpu Li
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View article: Distributed strain sensing based on hybrid system combining dual-sideband pump BOTDA and frequency-scanned <i>ϕ</i>-OTDR
Distributed strain sensing based on hybrid system combining dual-sideband pump BOTDA and frequency-scanned <i>ϕ</i>-OTDR Open
A distributed absolute strain sensing technology based on hybrid system combining dual-sideband pump BOTDA and frequency-scanned ϕ -OTDR is proposed, which can achieve high resolution in a large range of strain and maintain high accuracy. …
View article: High-accuracy strain sensing of frequency-scanned phase-sensitive optical time domain reflectometry based on block matching
High-accuracy strain sensing of frequency-scanned phase-sensitive optical time domain reflectometry based on block matching Open
A strain demodulation method of frequency-scanned ϕ -OTDR based on block matching is proposed, which improves the demodulation performance under short pulse width and large strain. The method of frequency shift estimation based on image bl…
View article: Optimization of the PDH frequency locking system based on the crystal birefringence theory and orthogonal demodulation scheme
Optimization of the PDH frequency locking system based on the crystal birefringence theory and orthogonal demodulation scheme Open
We have developed an orthogonal digital demodulation scheme for Pound-Drever-Hall (PDH) frequency locking systems using the field-programmable gate array (FPGA). This scheme enhances the error model by incorporating crystal birefringence t…
View article: Research on the influence of aperture process defects on the measurement precision and accuracy of autocollimator and compensation methods
Research on the influence of aperture process defects on the measurement precision and accuracy of autocollimator and compensation methods Open
As a benchmark apparatus for small-angle precision measurements, enhancing the measurement accuracy of autocollimators has always been a focal point of industry attention. However, there are currently no reports on the investigation of the…
View article: Terahertz image enhancement based on a multiscale feature extraction network
Terahertz image enhancement based on a multiscale feature extraction network Open
The development and application of terahertz (THz) waves hold great potential in military, industrial, and biomedical fields. Terahertz time-domain spectroscopy (THz-TDS) imaging systems capture a sample’s time-domain spectral signal to ac…
View article: Dual-Frequency Terahertz Amplitude Modulator Based on the Coupling Effect of Cross-Shaped Structure and U-Shaped Metal Patches
Dual-Frequency Terahertz Amplitude Modulator Based on the Coupling Effect of Cross-Shaped Structure and U-Shaped Metal Patches Open
This letter presents a dual-frequency terahertz amplitude modulator based on a cross-shaped structure and U-shaped metal patches. Its structural unit is a typical metal-substrate structure. The top metal consists of a cross-shaped structur…
View article: Individual Tuning of Directional Emission and Luminance of a Quantum Emitter in a Composite Plasmonic Antenna
Individual Tuning of Directional Emission and Luminance of a Quantum Emitter in a Composite Plasmonic Antenna Open
High directional emission and high radiative quantum efficiency are strongly needed when moving a single optical nano-emitter (such as a quantum dot) into the practical realm. However, a typical optical nano-emitter struggles to meet the r…
View article: Cross-Scale Feature Blending Model for Surface Defect Identification in Machine Tool Elements Resilient to Contaminant Interference
Cross-Scale Feature Blending Model for Surface Defect Identification in Machine Tool Elements Resilient to Contaminant Interference Open
Ball screw drives (BSDs) play a crucial role in various industrial applications, particularly in CNC machines. However, they are vulnerable to external variables potentially leading to premature wear, degradation, and failure. Traditional …
View article: Dynamically tunable electromagnetically induced transparency-like metamaterial structure based on polarization sensitivity
Dynamically tunable electromagnetically induced transparency-like metamaterial structure based on polarization sensitivity Open
In this paper, we propose a plasmon-induced transparency (PIT) metamaterial structure composed of Ag nanomaterials with polarization sensitivity. The metamaterial model consists of three bright modes with different resonant frequencies. Th…
View article: Piezoelectric and Magnetoelectric Effects of Flexible Magnetoelectric Heterostructure PVDF-TrFE/FeCoSiB
Piezoelectric and Magnetoelectric Effects of Flexible Magnetoelectric Heterostructure PVDF-TrFE/FeCoSiB Open
Flexible polymer-based magnetoelectric (ME) materials have broad application prospects and are considered as a new research field. In this article, FeCoSiB thin films were deposited on poly(vinylidene fluoride-co-trifluoroethylene) (PVDF-T…
View article: Autocollimation angle-measurement method with a large range based on spot deformation
Autocollimation angle-measurement method with a large range based on spot deformation Open
A novel hollow cylindrical cube-corner reflector (HCCCR) for the autocollimator (AC) is proposed. The angle measuring range of AC will be effectively increased by using the parallel propagation characteristics of the reflected light and th…
View article: Relapse Risk Prediction for Children with Henoch-Schönlein Purpura Based on GA-SVM
Relapse Risk Prediction for Children with Henoch-Schönlein Purpura Based on GA-SVM Open
The relapse risk prediction for children with Henoch-Schönlein purpura can help pediatricians make an accurate prognosis and offer personalized and appropriate follow-up nursing and relapse control to patients. In this study, we propose a …
View article: CMOS Multi-Matrix Optoelectronic System for High Speed Measurement of Main Mirror Deformation Large Diameter Radio Telescope
CMOS Multi-Matrix Optoelectronic System for High Speed Measurement of Main Mirror Deformation Large Diameter Radio Telescope Open
A complementary metal-oxide semiconductor (CMOS) multi-matrix-based optoelectronic system is proposed and studied to measure the deformation of each connection point of a large full-rotatable radio telescope. The system is based on 18 mult…
View article: Error compensation for long-distance measurements with a photoelectric autocollimator
Error compensation for long-distance measurements with a photoelectric autocollimator Open
Although autocollimators enable noncontact measurement, their performance is limited in large-scale and long-distance applications because of errors caused by nonideal point light sources. Therefore, we analyze this type of measurement err…
View article: A new grid- and modularity-based layout algorithm for complex biological networks
A new grid- and modularity-based layout algorithm for complex biological networks Open
The visualization of biological networks is critically important to aid researchers in understanding complex biological systems and arouses interest in designing efficient layout algorithms to draw biological networks according to their to…
View article: Cube-corner autocollimator with expanded measurement range
Cube-corner autocollimator with expanded measurement range Open
A cube-corner is employed as a photoelectric autocollimator's reflector to extend the angle measurement range and the corresponding algorithms are deduced. Experimental investigations reveal that the measurement range is extended from 1.2°…
View article: Smart Contract Security: A Software Lifecycle Perspective
Smart Contract Security: A Software Lifecycle Perspective Open
Smart contract security is an emerging research area that deals with security issues arising from the execution of smart contracts in a blockchain system. Generally, a smart contract is a piece of executable code that automatically runs on…
View article: Research on Microstructure and Properties of Friction Stir Welding Joint of 2A16 and 7075 Aluminum Alloy
Research on Microstructure and Properties of Friction Stir Welding Joint of 2A16 and 7075 Aluminum Alloy Open
The joint of 2A16-7075,7075-7075 and 2A16-2A16 aluminum alloy were obtained by friction stir welding under the condition of the stir head rotating speed of 1000rpm and welding speed of 100mm/min. The morphology of nugget area in different …