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- 摘要
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- 实验方案
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[IEEE 2018 19th International Conference on Electronic Packaging Technology (ICEPT) - Shanghai (2018.8.8-2018.8.11)] 2018 19th International Conference on Electronic Packaging Technology (ICEPT) - A Micro-Hotplate for MEMS Based Gas Sensor
摘要： This work designed a micro-hotplate for micro-electromechanical systems (MEMS) based gas sensor, in which the heating electrode and the test electrode are placed on the same plane. The micro-hotplate with four pins was optimized the finite element analysis method. The heating electrode and test electrode were made of platinum. The working temperature of heating electrode was controlled by the voltage linear of heating electrode and calibrated through the resistance-temperature characteristic curve and relation curve of voltage and resistance. Infrared thermography microscope directly observed the temperature distribution of the heating electrode at different voltages. The micro-hotplate was used for ethanol detecting based on SnO2 nanosheets and the response reached at 21.4 in 100 ppm ethanol gas.
关键词： MEMS,micro-hotplate,gas sensor
更新于2025-09-04 15:30:14
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Reduced Current Sensor Based Solar PV Fed Motion Sensorless Induction Motor Drive for Water Pumping
摘要： This paper proposes a solar photovoltaic (PV) array fed induction motor (IM) drive operated water pumping system with an speed adaptive estimator. It focuses on the implementation of a space vector modulation (SVM) of voltage source inverter (VSI) without current sensors. The motor phase currents are estimated from the DC link current. The VSI is used for maximum power tracking and to drive an IM. A generalized integrator based flux adaptation approach is used to improve the drive performance. Moreover, a modified model reference adaptive system (MRAS) based speed estimation with rotor fluxes and stationary frame currents enhances its stability throughout the operating range. A modified algorithm based on incremental-conductance (InC) is proposed for maximum power point (MPP), which is used for peak power tracking at each insolation with a technique to control flow-rate. The overall system incorporating a single-stage PV powered space vector modulation (SVM) based VSI fed IM driven water pump is modeled and its performance is simulated in MATLAB/Simulink environment. The appropriateness of proposed system is verified experimentally on a prototype developed in the laboratory under various operating conditions.
关键词： Incremental-conductance (InC) algorithm,Speed adaptation,PV array,Induction motor drive (IMD),Water pump,Current sensor reduction,Field-oriented control (FOC)
更新于2025-09-04 15:30:14
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The Design and Implementation of Photoelectric Sensor for Yarn Color Fault Detection
摘要： The paper mainly aimed at solving the problem of yarn color fault detection. Yarn with different color is hard to detect in yarn production, a special photoelectric sensor is designed in this paper. First, this paper analyzed the requirement of light source and photoelectric receiver in the photoelectric sensor, and designs the light path and driver circuit. Then this paper analyzed the amplifier circuit and noise in the photoelectric sensor, with an amplifier circuit of minimal noise proposed at last. Finally, this paper tested the yarn color fault detection system with virtual instrument, and the test results showed a great application prospect of the photoelectric sensor. Photoelectric yarn clearer was the first type of electronic yarn clearer, but due to the under development of the optical technology and measurement technology, the photoelectric yarn cleaner can't meet the requirements of textile production, gradually replaced by capacitive yarn cleaner. Though photoelectric yarn cleaner had a good visual conformity degree, it’s still a unreplaceable method in colored yarn faults.
关键词： Fault Detection,Yarn,Photoelectric Sensor,Color
更新于2025-09-04 15:30:14
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Research of Multifunctional Fitness Equipment Monitor Based on Photoelectric Sensor
摘要： Health is an eternal topic of human concern, especially in modern times, and fitness equipment is an important part fitness routines. With the rapid development of information technology and electronic technology, using photoelectric methods to detect the physiology index of the human body has become an unescapable trend. Therefore, bringing in some advanced technology in other fields to design a portable, noninvasive, low-cost multifunctional human physiological health index monitor has great significance. This thesis first introduces the situation of fitness equipment, then studies people's demand for intelligent fitness equipment, and specifically proposes the measurement scheme of a human physical health index based on a photoelectric sensor. By studying the production principle of photoelectric volume pulse waves, this thesis sets up the experimental platform to prove the effectiveness of the proposed method. Finally, this research shows that intelligent fitness equipment like a multifunctional fitness monitor based on a photoelectric sensor can effectively improve people's exercise style and has large market application prospects.
关键词： Fitness Equipment,Monitor,Photoelectric Sensor
更新于2025-09-04 15:30:14
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Impact of MODIS sensor calibration updates on Greenland Ice Sheet surface reflectance and albedo trends
摘要： We evaluate Greenland Ice Sheet (GrIS) surface re?ectance and albedo trends using the newly released Collection 6 (C6) MODIS (Moderate Resolution Imaging Spectroradiometer) products over the period 2001–2016. We ?nd that the correction of MODIS sensor degradation provided in the new C6 data products reduces the magnitude of the surface re?ectance and albedo decline trends obtained from previous MODIS data (i.e., Collection 5, C5). Collection 5 and 6 data product analysis over GrIS is characterized by surface (i.e., wet vs. dry) and elevation (i.e., 500–2000 m, 2000 m and greater) conditions over the summer season from 1 June to 31 August. Notably, the visible-wavelength declining re?ectance trends identi?ed in several bands of MODIS C5 data from previous studies are only slightly detected at reduced magnitude in the C6 versions over the dry snow area. Declining albedo in the wet snow and ice area remains over the MODIS record in the C6 product, albeit at a lower magnitude than obtained using C5 data. Further analyses of C6 spectral re?ectance trends show both re?ectance increases and decreases in select bands and regions, suggesting that several competing processes are contributing to Greenland Ice Sheet albedo change. Investigators using MODIS data for other ocean, atmosphere and/or land analyses are urged to consider similar re-examinations of trends previously established using C5 data.
关键词： MODIS,sensor calibration,albedo,surface re?ectance,Greenland Ice Sheet
更新于2025-09-04 15:30:14
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Hydrogen Sensing Properties of Co-Doped ZnO Nanoparticles
摘要： In this study, the gas sensing properties of Co-doped ZnO nanoparticles (Co-ZnO NPs) synthesized via a simple sol-gel method are reported. The microstructure and morphology of the synthesized Co-ZnO NPs were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM), respectively. Co-ZnO NPs were then used for developing a conductometric gas sensor for the detection, at mild temperature, of low concentration of hydrogen (H2) in air. To evaluate the selectivity of the sensor, the sensing behavior toward some VOCs such as ethanol and acetone, which represent the most important interferents for breath hydrogen analysis, was also investigated in detail. Results reported demonstrated better selectivity toward hydrogen of the Co-ZnO NPs sensor when compared to pure ZnO. The main factors contributing to this behavior, i.e., the transition from n-type behavior of pristine ZnO to p-type behavior upon Co-doping, the modification of oxygen vacancies and acid-base characteristics have been considered. Hence, this study highlights the importance of Co doping of ZnO to realize a high performance breath hydrogen sensor.
关键词： Co-doped ZnO,gas sensor,sol-gel,nanoparticle,sensing mechanism,hydrogen,ethanol
更新于2025-09-04 15:30:14
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Matching Multi-Sensor Remote Sensing Images via an Affinity Tensor
摘要： Matching multi-sensor remote sensing images is still a challenging task due to textural changes and non-linear intensity differences. In this paper, a novel matching method is proposed for multi-sensor remote sensing images. To establish feature correspondences, an affinity tensor is used to integrate geometric and radiometric information. The matching process consists of three steps. First, features from an accelerated segment test are extracted from both source and target images, and two complete graphs are constructed with their nodes representing these features. Then, the geometric and radiometric similarities of the feature points are represented by the three-order affinity tensor, and the initial feature correspondences are established by tensor power iteration. Finally, a tensor-based mismatch detection process is conducted to purify the initial matched points. The robustness and capability of the proposed method are tested with a variety of remote sensing images such as Ziyuan-3 backward, Ziyuan-3 nadir, Gaofen-1, Gaofen-2, unmanned aerial vehicle platform, and Jilin-1. The experiments show that the average matching recall is greater than 0.5, which outperforms state-of-the-art multi-sensor image-matching algorithms such as SIFT, SURF, NG-SIFT, OR-SIFT and GOM-SIFT.
关键词： matching blunder detection,affinity tensor,multi-sensor remote sensing image,graph theory,image matching
更新于2025-09-04 15:30:14
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[Smart Innovation, Systems and Technologies] Information and Communication Technology for Intelligent Systems Volume 107 (Proceedings of ICTIS 2018, Volume 2) || Selection of Optimum Sensors for Cooperative Sensing in Cognitive Radio
摘要： Joint optimization of sensing time and channel overhead without compromising with the performance of cooperative sensing is a major issue in cognitive radio (CR) network. The paper presents an idea, instead of fusing data from all CRs, fuse data from CRs which have higher reliability. The proposed model reduces sensing time and channel overhead. Simulation result shows that the proposed model outperforms the hard and soft fusion rule, especially when the CR (cooperative node) is in large number. A cooperative scenario was developed using USRP 2942R to test the technique over real-time data.
关键词： Wideband sensing,Optimum sensor,USRP 2942R,Cooperative sensing,Cognitive radio
更新于2025-09-04 15:30:14
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Improving the calibration of silicon photodiode pyranometers
摘要： Reliable measurements of global irradiance are essential for research and practical applications. Silicon photodiode pyranometers (SiPs) offer low-cost sensors to measure direct and diffuse irradiance despite their non-uniform spectral response over the 300–1000 nm spectral range. In this study, non-adjusted linear and adjusted calibrations were applied at different times of the year to determine sources of estimated errors in global irradiance due to the two calibration approaches, calibration time, and sensor age. 16 SiPs, along with two standards, measured incident global irradiance over a 5-year period under a range of sky conditions. Sensors performed best in the months in which they were calibrated when using the linear calibration approach. With the solar zenith angle adjusted calibration approach, certain calibration months provide a defendable validation for the following 12 months [ranging an average of 13.5–17.4 W m?2 standard error (SE)], while other calibration months do not provide consistent results and sometimes result in very poor validation (31.1–242.7 W m?2 SE). Older sensors (greater than 6 years) in general become more sensitive to solar zenith angle and their response drifts over time, while newer SiPs performed better than older sensors. Calibrations which accounted for solar zenith angle effects improved global irradiance estimates for older SiPs. For the Lincoln NE location, the appropriate calibration is in spring or late summer, regardless of calibration approach. These results indicate that solar zenith angle correction is not needed for largely diffuse components under cloudy conditions, so that in the future, a “smart” calibration may be possible, where diffuse radiation fractions are known.
关键词： Silicon photodiode pyranometers,Sensor age,Calibration,Solar zenith angle,Global irradiance
更新于2025-09-04 15:30:14
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Effect of elastomer characteristics on fiber optic force sensing performance in biomedical robotics applications
摘要： Miniaturized and “smart” sensors are required for research in biology, physiology, and biomechanics, and they have extremely important clinical applications for diagnostics and minimally invasive surgery. Fiber optic sensors have been proven to provide advantages compared to conventional sensors and high potential for biomechanical and biomedical applications. They are small, easy to operate, minimally invasive with low risk, more accurate, and inexpensive. This paper reports the design and modeling of a fiber optic force sensor that is capable of measuring compliance for a contact force of up to 1 N. The main objective of this study is to design and model a fiber optic sensor capable of measuring the total force applied on an object. A polydimethylsiloxane (PDMS) elastomer film with a thickness of 1.2 mm is placed between an optical fiber tip and an object, and it is used for measuring the force applied on a rigid element. The compliance of the fiber optic force sensor is measured by recording the response of PDMS elastomer films under different load conditions. We use finite element modeling results as a basis for comparing experimental data. The agreement between theoretical predictions and experimental data is reasonable and within an acceptable range.
关键词： Force sensor,FEM analysis,Optical fiber,Elastomer,MATLAB analysis,LabVIEW,ANSYS simulation,Biomedical robotics
更新于2025-09-04 15:30:14