期刊文献+
共找到2,330篇文章
< 1 2 117 >
每页显示 20 50 100
Laser direct writing of Ga_(2)O_(3)/liquid metal-based flexible humidity sensors 被引量:6
1
作者 Songya Cui Yuyao Lu +5 位作者 Depeng Kong Huayu Luo Liang Peng Geng Yang Huayong Yang Kaichen Xu 《Opto-Electronic Advances》 SCIE EI CAS CSCD 2023年第7期30-39,共10页
Flexible and wearable humidity sensors play a vital role in daily point-of-care diagnosis and noncontact human-machine interactions.However,achieving a facile and high-speed fabrication approach to realizing flexible ... Flexible and wearable humidity sensors play a vital role in daily point-of-care diagnosis and noncontact human-machine interactions.However,achieving a facile and high-speed fabrication approach to realizing flexible humidity sensors remains a challenge.In this work,a wearable capacitive-type Ga_(2)O_(3)/liquid metal-based humidity sensor is demonstrated by a one-step laser direct writing technique.Owing to the photothermal effect of laser,the Ga_(2)O_(3)-wrapped liquid metal particles can be selectively sintered and converted from insulative to conductive traces with a resistivity of 0.19Ω·cm,while the untreated regions serve as active sensing layers in response to moisture changes.Under 95%relative humidity,the humidity sensor displays a highly stable performance along with rapid response and recover time.Utilizing these superior properties,the Ga_(2)O_(3)/liquid metal-based humidity sensor is able to monitor human respiration rate,as well as skin moisture of the palm under different physiological states for healthcare monitoring. 展开更多
关键词 laser direct writing liquid metal humidity sensors flexible electronics wearable sensors
下载PDF
Functionalized Hydrogel-Based Wearable Gas and Humidity Sensors 被引量:3
2
作者 Yibing Luo Jianye Li +3 位作者 Qiongling Ding Hao Wang Chuan Liu Jin Wu 《Nano-Micro Letters》 SCIE EI CAS CSCD 2023年第9期103-147,共45页
Breathing is an inherent human activity;however,the composition of the air we inhale and gas exhale remains unknown to us.To address this,wearable vapor sensors can help people monitor air composition in real time to ... Breathing is an inherent human activity;however,the composition of the air we inhale and gas exhale remains unknown to us.To address this,wearable vapor sensors can help people monitor air composition in real time to avoid underlying risks,and for the early detection and treatment of diseases for home healthcare.Hydrogels with three-dimensional polymer networks and large amounts of water molecules are naturally flexible and stretchable.Functionalized hydrogels are intrinsically conductive,self-healing,self-adhesive,biocompatible,and room-temperature sensitive.Compared with traditional rigid vapor sensors,hydrogel-based gas and humidity sensors can directly fit human skin or clothing,and are more suitable for real-time monitoring of personal health and safety.In this review,current studies on hydrogel-based vapor sensors are investigated.The required properties and optimization methods of wearable hydrogel-based sensors are introduced.Subsequently,existing reports on the response mechanisms of hydrogel-based gas and humidity sensors are summarized.Related works on hydrogel-based vapor sensors for their application in personal health and safety monitoring are presented.Moreover,the potential of hydrogels in the field of vapor sensing is elucidated.Finally,the current research status,challenges,and future trends of hydrogel gas/humidity sensing are discussed. 展开更多
关键词 Health and safety monitoring Gas and humidity sensor Functionalized hydrogel Wearable sensor Flexible and stretchable sensor
下载PDF
Dielectric Properties of Capacitive-Type Humidity Sensor Made under Different Pressures 被引量:1
3
作者 Jing Wang Xiao-hua Wang 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2006年第A03期366-368,共3页
Capacitive humidity sensors were made of nanometer barium titanate.The pellets were prepared under different pressures between 3920N to 7850N force.The capacitance changes in three orders of magnitude in the relative ... Capacitive humidity sensors were made of nanometer barium titanate.The pellets were prepared under different pressures between 3920N to 7850N force.The capacitance changes in three orders of magnitude in the relative humidity range of 10%~98%,indicating high humidity sensitivity of the sensors.At a certain measuring frequency,the capacitance of the sensors increases as increasing of the preparation pressure,while the sensitivity of the sensors basically remains the same.The frequencies corresponding to the peaks of the dielectric loss of the sensors move to the higher frequency direction as increasing of the relative humidity.At a certain humidity,the frequencies corresponding to the peaks of the dielectric loss move to the higher frequency direction as increasing of the preparation pressure. 展开更多
关键词 humidity sensor capacitive-type preparation pressure humidity sensing property
下载PDF
Study of the Preparation Technology and Mechanics of the Compound Temperature-Humidity Sensor 被引量:1
4
作者 Jing Huang Yuezhou Zhang Hong Lin 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2006年第A03期375-376,共2页
The development and character of compound temperature-humidity sensor were discussed in this study.The design of sampling,control and output unit of temperature-humidity sensor as well as their manufacture method and ... The development and character of compound temperature-humidity sensor were discussed in this study.The design of sampling,control and output unit of temperature-humidity sensor as well as their manufacture method and character were studied in detail.The relationship between components of humidity resistance materials and negative temperature coefficient ( NTC) thermistor materials in sampling unit of compound sensor and character of electrical resistance and temperature was obtained.Couples of character curves of compound temperature-humidity sensor and data of materials of sampling unit were shown in this paper too. 展开更多
关键词 compound temperature-humidity sensor compensation of humidity embedded system network output
下载PDF
Polyimide Humidity Integrated Sensor Fabricated Using the MEMS Process
5
作者 Dianzhong Wen 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2006年第A03期361-362,共2页
This paper reports on the fabrication and sensing characteristics of Polyimide-based humidity sensor,based on that,a new integrated circuit of humidity measurement has been designed.It is a novel capacitive-type syste... This paper reports on the fabrication and sensing characteristics of Polyimide-based humidity sensor,based on that,a new integrated circuit of humidity measurement has been designed.It is a novel capacitive-type systems on a chip structure using the MEMS process.The results show that the new sensor presents sensing characteristics over a humidity range from 10%~70% RH at 20℃,and the sensor is able to fabricated together with ICs technology.The result shows that integration of humidity sensor with integrated circuit of humidity measurement is considerably easier when they are built in sensing groove.The appeal of a new structure like this brings the possibility of applications that would require the flexibility of simple screen printing. 展开更多
关键词 polyimide film humidity sensor MEMS process IC fabrication humidity integrated sensor
下载PDF
The Humidity Sensor Using the Polyacrylic Emulsion Containing Magnesium Chloride
6
作者 Ching-Han Yu Jung-Chuan Chou +1 位作者 Tai-Ping Sun Shen-Kan Hsiung 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2006年第A03期369-371,共3页
An impedance type humidity sensor based on the polyacrylic emulsion containing magnesium chloride (MgCl_2) without chemical modification was investigated.The impedances of the sensor were measured from various relati... An impedance type humidity sensor based on the polyacrylic emulsion containing magnesium chloride (MgCl_2) without chemical modification was investigated.The impedances of the sensor were measured from various relative humidity in the frequency range between 0.1kHz and 100 kHz.The sensor has a good sensitivity from 60%RH to 90%RH.According to the experimental results,the response time is about 240 seconds in the adsorption process and 310 seconds in the desorption process. 展开更多
关键词 humidity sensor polyacrylic emulsion relative humidity DESORPTION magnesium chloride
下载PDF
Electrospinning of Flexible Poly(vinyl alcohol)/MXene Nanofiber-Based Humidity Sensor Self-Powered by Monolayer Molybdenum Diselenide Piezoelectric Nanogenerator 被引量:16
7
作者 Dongyue Wang Dongzhi Zhang +3 位作者 Peng Li Zhimin Yang Qian Mi Liandong Yu 《Nano-Micro Letters》 SCIE EI CAS CSCD 2021年第4期30-42,共13页
Two-dimensional material has been widely investigated for potential applications in sensor and flexible electronics.In this work,a self-powered flexible humidity sensing device based on poly(vinyl alcohol)/Ti_(3)C_(2)... Two-dimensional material has been widely investigated for potential applications in sensor and flexible electronics.In this work,a self-powered flexible humidity sensing device based on poly(vinyl alcohol)/Ti_(3)C_(2)Tx(PVA/MXene)nanofibers film and monolayer molybdenum diselenide(MoSe2)piezoelectric nanogenerator(PENG)was reported for the first time.The monolayer MoSe_(2)-based PENG was fabricated by atmospheric pressure chemical vapor deposition techniques,which can generate a peak output of 35 mV and a power density of42 mW m^(-2).The flexible PENG integrated on polyethylene terephthalate(PET)substrate can harvest energy generated by different parts of human body and exhibit great application prospects in wearable devices.The electrospinned PVA/MXene nanofiber-based humidity sensor with flexible PET substrate under the driven of monolayer MoSe_(2) PENG,shows high response of~40,fast response/recovery time of 0.9/6.3 s,low hysteresis of 1.8%and excellent repeatability.The self-powered flexible humidity sensor yields the capability of detecting human skin moisture and ambient humidity.This work provides a pathway to explore the high-performance humidity sensor integrated with PENG for the self-powered flexible electronic devices. 展开更多
关键词 Self-powered sensing Monolayer molybdenum diselenide Piezoelectric nanogenerator humidity sensor Flexible electronics
下载PDF
Orange dye polyaniline composite based impedance humidity sensors 被引量:3
8
作者 Muhammad Tariq Saeed Chani Kh. S. Karimov +2 位作者 F. A. Khalid S. Z. Abbas M. B. Bhatty 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第1期161-166,共6页
This study presents the fabrication and investigation (PANI) composite films. A blend of 3 wt.% OD with 1 of humidity sensors based on orange dye (OD) and polyaniline wt.% PANI was prepared in 1 ml water. The comp... This study presents the fabrication and investigation (PANI) composite films. A blend of 3 wt.% OD with 1 of humidity sensors based on orange dye (OD) and polyaniline wt.% PANI was prepared in 1 ml water. The composite films were deposited on glass substrates between pre-deposited silver electrodes. The gap between the electrodes was 45 um. The sensing mechanism was based on the impedance and capacitance variations due to the absorption/desorption of water vapor. It was observed that with the increase in relative humidity (RH) from 30% to 90%, the impedance decreases by 5.2 × 10^4 and 8.8 × 10^3 times for the frequencies of 120 Hz and 1 kHz, respectively. The impedance-humidity relationship showed a more uniform change compared to the capacitance-humidity relationship in the RH range of 30% to 90%. The consequence of annealing, measuring frequency, response and recovery time, and absorption-desorption behavior of the humidity sensor were also discussed in detail. The annealing resulted in an increase in sensitivity of up to 2.5 times, while the measured response time and recovery time were 34 s and 450 s, respectively. The impedance-humidity relationship was simulated. 展开更多
关键词 organic-organic composite humidity sensor POLYANILINE orange dye
下载PDF
Multifunctional Flexible Humidity Sensor Systems Towards Noncontact Wearable Electronics 被引量:11
9
作者 Yuyao Lu Geng Yang +2 位作者 Yajing Shen Huayong Yang Kaichen Xu 《Nano-Micro Letters》 SCIE EI CAS CSCD 2022年第9期187-220,共34页
In the past decade,the global industry and research attentions on intelligent skin-like electronics have boosted their applications in diverse fields including human healthcare,Internet of Things,human–machine interf... In the past decade,the global industry and research attentions on intelligent skin-like electronics have boosted their applications in diverse fields including human healthcare,Internet of Things,human–machine interfaces,artificial intelligence and soft robotics.Among them,flexible humidity sensors play a vital role in noncontact measurements relying on the unique property of rapid response to humidity change.This work presents an overview of recent advances in flexible humidity sensors using various active functional materials for contactless monitoring.Four categories of humidity sensors are highlighted based on resistive,capacitive,impedance-type and voltage-type working mechanisms.Furthermore,typical strategies including chemical doping,structural design and Joule heating are introduced to enhance the performance of humidity sensors.Drawing on the noncontact perception capability,human/plant healthcare management,human-machine interactions as well as integrated humidity sensor-based feedback systems are presented.The burgeoning innovations in this research field will benefit human society,especially during the COVID-19 epidemic,where cross-infection should be averted and contactless sensation is highly desired. 展开更多
关键词 Flexible electronics Flexible humidity sensors Noncontact detection Healthcare monitoring Human-machine interactions COVID-19 epidemic
下载PDF
A NOVEL RESISTIVE HUMIDITY SENSOR BASED ON SODIUM POLYSTYRENESULFONATE/TiO_2 NANOCOMPOSITES 被引量:2
10
作者 Yang Li Mu-jie Yang Yong She Department of Polymer Science and Engineering Zhejiang University, Hangzhou 310027 China 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2002年第3期237-241,共5页
A resistive humidity sensor was prepared based on sodium polystyrenesulfonate (NaPSS)/TiO2 nanocomposites, and its electrical response to humidity was examined. The sensor exhibits better linearity, smaller hysteresis... A resistive humidity sensor was prepared based on sodium polystyrenesulfonate (NaPSS)/TiO2 nanocomposites, and its electrical response to humidity was examined. The sensor exhibits better linearity, smaller hysteresis (< 4% RH) and quicker response (absorption: less than 2 s; desorption: less than 20 s) in comparison with sensor composed of NaPSS. The effect of concentration of NaPSS and TiO2 on humidity response of sensors was discussed. 展开更多
关键词 humidity sensor NANOCOMPOSITES TIO2 sodium polystyrenesulfonate
下载PDF
Multifunctional disk device for optical switch and temperature sensor 被引量:1
11
作者 卞振宇 梁瑞生 +3 位作者 张郁靖 易丽璇 赖根 赵瑞通 《Chinese Physics B》 SCIE EI CAS CSCD 2015年第10期518-521,共4页
A multifunctional surface plasmon polariton disk device coupled by two metal-insulator-metal(MIM) waveguides is proposed and investigated numerically with finite-difference time-domain simulation. It can be used as ... A multifunctional surface plasmon polariton disk device coupled by two metal-insulator-metal(MIM) waveguides is proposed and investigated numerically with finite-difference time-domain simulation. It can be used as optical switch and temperature sensor by filling disk with liquid crystal and ethanol, respectively. The simulation results demonstrate that the transmission characteristics of an optical switch can be manipulated by adjusting the radius of disk and the slit width between disk and MIM waveguides. The transmittance and modulation depth of optical switch at 1550 nm are up to 64.82% and 17.70 d B, respectively. As a temperature sensor, its figure of merit can reach 30.46. In this paper, an optical switch with better efficiency and a temperature sensor with better sensitivity can be achieved. 展开更多
关键词 surface plasmon polaritons optical switch modulation depth temperature sensor figure of merit
下载PDF
Surface Acoustic Wave Humidity Sensors Based on(1120) ZnO Piezoelectric Films Sputtered on R-Sapphire Substrates 被引量:3
12
作者 王艳 张淑仪 +2 位作者 范理 水修基 杨跃涛 《Chinese Physics Letters》 SCIE CAS CSCD 2015年第8期123-126,共4页
ZnO films on R-sapphire substrates are prepared and characterized by x-ray diffraction and scanning electron microscopy, which indicate that the thin films are well crystallized with (1120) texture. Love wave and Ra... ZnO films on R-sapphire substrates are prepared and characterized by x-ray diffraction and scanning electron microscopy, which indicate that the thin films are well crystallized with (1120) texture. Love wave and Rayleigh wave are used for fabrications of humidity sensors, which are excited in [1100] and [0001] directions of the (1120) ZnO piezoelectric films, respectively. The experimental results show that both kinds of sensors have good humidity response and repeatability, and the performances of the Love wave sensors are better than those of the Rayleigh wave sensors at room temperature. Moreover, the theoretical calculations of the mass sensitivity of the sensors are a/so carried out and the calculated results are in good agreement with the experimental measurements. 展开更多
关键词 ZnO Piezoelectric Films Sputtered on R-Sapphire Substrates Surface Acoustic Wave humidity sensors Based on
下载PDF
Outstanding Humidity Chemiresistors Based on Imine-Linked Covalent Organic Framework Films for Human Respiration Monitoring 被引量:4
13
作者 Xiyu Chen Lingwei Kong +9 位作者 Jaafar Abdul-Aziz Mehrez Chao Fan Wenjing Quan Yongwei Zhang Min Zeng Jianhua Yang Nantao Hu Yanjie Su Hao Wei Zhi Yang 《Nano-Micro Letters》 SCIE EI CAS CSCD 2023年第9期368-383,共16页
Human metabolite moisture detection is important in health monitoring and non-invasive diagnosis.However,ultra-sensitive quantitative extraction of respiration information in real-time remains a great challenge.Herein... Human metabolite moisture detection is important in health monitoring and non-invasive diagnosis.However,ultra-sensitive quantitative extraction of respiration information in real-time remains a great challenge.Herein,chemiresistors based on imine-linked covalent organic framework(COF)films with dual-active sites are fabricated to address this issue,which demonstrates an amplified humidity-sensing signal performance.By regulation of monomers and functional groups,these COF films can be pre-engineered to achieve high response,wide detection range,fast response,and recovery time.Under the condition of relative humidity ranging from 13 to 98%,the COFTAPB-DHTA film-based humidity sensor exhibits outstanding humidity sensing perfor-mance with an expanded response value of 390 times.Furthermore,the response values of the COF film-based sensor are highly linear to the relative humidity in the range below 60%,reflecting a quantitative sensing mechanism at the molecular level.Based on the dual-site adsorption of the(-C=N-)and(C-N)stretching vibrations,the revers-ible tautomerism induced by hydrogen bonding with water molecules is demonstrated to be the main intrinsic mechanism for this effective humidity detection.In addition,the synthesized COF films can be further exploited to effectively detect human nasal and oral breathing as well as fabric permeability,which will inspire novel designs for effective humidity-detection devices. 展开更多
关键词 Covalent organic frameworks humidity sensors Reversible tautomerism Non-invasive diagnosis Health monitoring
下载PDF
The Sensing Behavior to Volatile Organic Compounds Gas on Polypyrrole Sensor under Humidity Condition
14
作者 Jae-Hyun Cho Joon-Boo Yu +2 位作者 Sung-Ok Sohn Duk-Dong Lee Jeung-Soo Huh 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2006年第A03期65-66,共2页
Polypyrrole (PPy) powder was synthesized by chemical polymerization at 0℃under atmospheric condition and its layer was prepared by dip coating method on the alumina substrate with interdigitated electrodes.The influ... Polypyrrole (PPy) powder was synthesized by chemical polymerization at 0℃under atmospheric condition and its layer was prepared by dip coating method on the alumina substrate with interdigitated electrodes.The influence of relative humidity (RH 0~70%) to PPy sensor was studied.The measuring temperature was fixed at 25℃.Methanol and benzene were used as target gases.Various analytic techniques were examined to observe changes in the properties of PPy sensor.The sensitivity of PPy sensor to water vapor was linearly increased with the increasing humidity.As the relative humidity increase from 0% to 70%,the sensitivities to methanol and benzene vapor were reduced,and reduction ratio of sensitivity was 94%, 92.5% at RH 70%,respectively. 展开更多
关键词 VOCS POLYPYRROLE humidity effect gas sensor
下载PDF
A Novel Thin Film Resistive Humidity Sensor Based on SolubleConjugated Polymer:(propionic acid)-co-(propargyl alcohol)
15
作者 Yang LI Mu Jie YANG 《Chinese Chemical Letters》 SCIE CAS CSCD 2001年第8期701-702,共2页
A novel soluble conjugated copolymer (propionic acid)-co-(propargyl alcohol) (PA-co-OHP) has been synthesized for the first time using a new palladium acetylide catalyst Pd(PPh3)(2)(C=CC(CH3)(2)OH)(2)(PPB). Thin film ... A novel soluble conjugated copolymer (propionic acid)-co-(propargyl alcohol) (PA-co-OHP) has been synthesized for the first time using a new palladium acetylide catalyst Pd(PPh3)(2)(C=CC(CH3)(2)OH)(2)(PPB). Thin film resistive humidity sensor based oil the copolymer doped with HClO4 was prepared. The impedance of the sensor changed from 10(3)similar to 10(7) Omega in 95%similar to 30%RH, and the response of that is very quick (<6 sec.). Preliminary results show the copolymer is a promising humidity sensitive material. 展开更多
关键词 humidity sensor conjugated polymer propiolinc acid propargyl alcohol
下载PDF
Fiber Optic Humidity Sensor Based on Self-Assembled Polyelectrolyte Multilayers
16
作者 余海湖 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2001年第3期65-69,共5页
Polyelectrolyte multilayers were self-assembled onto planar glass substrates and multimode optic fibers. The multilayer thin films deposited on glass substrates were characterized by using UV-vis spectroscopy and X-ra... Polyelectrolyte multilayers were self-assembled onto planar glass substrates and multimode optic fibers. The multilayer thin films deposited on glass substrates were characterized by using UV-vis spectroscopy and X-ray photoelectron spectroscope. The multilayer thin films containing hydrophilic side-groups possessed are affinity for uwer molecules. The adsorption and desorption of free water vapor gave rise to the changes in the refractive index and in the reflectance of the thin films. A multilayer thin film based fiber optic humidity sensor with an LED light source of 0.85 mum was designed. Under certain conditions, the rejected light intensity of the thin film sensor was a function of the humidity of air. About 30 bilayers was optimal for the multilayer thin film sensor working at wavelength of 0.85 mum. This sensor can work over almost the whole relative humidity range with very good sensitivity. 展开更多
关键词 fiber optic sensor humidity SELF-ASSEMBLY polyelectrolyte multilayer thin film
下载PDF
Design of ispPAC-based Humidity Sensor Signal Processing Circuits
17
作者 Duren Liu Jin Liu Zhichun Ren 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2006年第A03期363-365,共3页
The widely used sensitive elements of humidity sensors can be divided into 3 types,i.e.,resistor,capacitor,and electrolyte.Humidity sensors consisting of these sensitive elements have corresponding signal processing c... The widely used sensitive elements of humidity sensors can be divided into 3 types,i.e.,resistor,capacitor,and electrolyte.Humidity sensors consisting of these sensitive elements have corresponding signal processing circuit unique to each type of sensitive elements.This paper presents an ispPAC (in-system programmable Programmable Analog Circuit) -based humidity sensor signal processing circuit designed with software method and implemented with in-system programmable simulators.Practical operation shows that humidity sensor signal processing circuits of this kind,exhibit stable and reliable performance. 展开更多
关键词 programmable analog circuit humidity sensors signal processing circuit
下载PDF
Sol-Gel Relative Humidity Sensors: Impact of Electrode Geometry on Performance in Soil Suction Measurements
18
作者 Rafaela Cardoso Gabriele Sarapajevaite +2 位作者 Oleksandr Korsun Susana Cardoso Laura Ilharco 《Journal of Sensor Technology》 2017年第1期1-23,共23页
This paper describes the experimental procedure followed to fabricate and validate sol-gel based RH sensors which will be incorporated in soil specimens for standard laboratorial tests. It is the first time such senso... This paper describes the experimental procedure followed to fabricate and validate sol-gel based RH sensors which will be incorporated in soil specimens for standard laboratorial tests. It is the first time such sensors were used for soil suction measurement. They are microfabricated relative humidity sensors (footprint area 11,000 μm × 22,000 μm) operating based on changes in electrical resistivity detected by a cerium doped silica titania film deposited using a sol-gel technique. Their design required gathering experts in several engineering specialties. The working principle of the sensors is based on water vapour equilibrium between the air in the soil and in the sol-gel pores, due to the contact between the two porous materials. The spacing between interdigitated aluminium electrodes was optimized to improve the sensing properties of the sol-gel. The calibration of the different prototypes was done against compacted clay, varying the spacing between 100 and 700 μm. The sensors were also incorporated in soil samples for suction measurement during wetting and drying paths. They were validated by comparing the readings with those from a water dew point potentiometer. From this study it was possible to determine the optimum electrodes spacing of 200 μm. Error was explained by sol-gel heterogeneity effect and by the resolution of the sensing area provided by the electrodes spacing. When comparing with other sensors operating inside soil specimens in standard laboratorial tests, these sol-gel sensors extend the operation range available with the alternative technologies: while conventional tensiometers measure suction ranges from 0 to 1.8 MPa, our sensors demonstrate good results between 1 to 10 MPa (and higher). 展开更多
关键词 Microfabricated Interdigitated ELECTRODES humidity sensors SUCTION UNSATURATED SOILS
下载PDF
Humidity sensor based on BiOBr synthesized under ambient condition
19
作者 Chaofan Cao Guixian Xiao Yao Lu 《Journal of Semiconductors》 EI CAS CSCD 2022年第12期95-100,共6页
Flexible humidity sensors are effective portable devices for human respiratory monitoring.However,the current pre-paration of sensitive materials need harsh terms and the small production output limits their practicab... Flexible humidity sensors are effective portable devices for human respiratory monitoring.However,the current pre-paration of sensitive materials need harsh terms and the small production output limits their practicability.Here,we report a syn-thesis method of single-crystal BiOBr nanosheets under room temperature and atmospheric pressure based on a sonochemic-al strategy.A flexible humidity sensor enabled by BiOBr nanosheets deliver efficient sensing performance,a high humidity sensit-ivity(Ig/I0=550%)with relative humidity from 40%to 100%,an excellent selectivity,and a detection response/recovery time of 11 and 6 s,respectively.The flexible humidity sensor shows a potential application value as a wearable monitoring device for res-piratory disease prevention and health monitoring. 展开更多
关键词 human breathing BiOBr nanosheets sonochemical strategy flexible humidity sensor
下载PDF
Experimental Noise Analysis of Reed Switch Sensor Signal under Environmental Vibration
20
作者 Odgerel Ayurzana Hiesik Kim 《Computer Technology and Application》 2016年第2期96-102,共7页
The chattering noise problem of reed switch sensor signal for Automatic Meter Reading system was analyzed experimentally under various types of external vibrations and shocks. The external vibration level amplitude wa... The chattering noise problem of reed switch sensor signal for Automatic Meter Reading system was analyzed experimentally under various types of external vibrations and shocks. The external vibration level amplitude was measured with an accelerometer. To apply for water flow measurement devices, the reed switch sensors should keep high reliability. But the measured digital meter data are occurred difference or errors by chattering noise. The reed switch contains chattering error by itself at the force equivalent position. The vibrations such as passing vehicle near to the reed switch installed location causes chattering. In order to reduce chattering error, most system uses just software methods, for example using digital filter algorithm and also statistical calibration methods. However software approaches were implemented for reducing chattering error, there has still generated chattering error due to external mechanical vibrations and magnetic field. The chattering errors can be reduced by changing leaf spring structure using mechanical hysteresis characteristics. 展开更多
关键词 Noise analysis ACCELEROMETER MAGNET VIBRATION reed switch sensor chattering error.
下载PDF
上一页 1 2 117 下一页 到第
使用帮助 返回顶部