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low-noise,low-power-consumption seafloor vector magnetometer

Journal of Oceanology and Limnology 2023年第2期41卷 804-815页

作者： Xiaochen LI Xianhu LUO Ming DENG Ning QIU Zhen SUN Kai CHEN China University of Geosciences Beijing 100083China Guangzhou Marine Geological Survey China Geological SurveyMinistry of Natural ResourcesGuangzhou 511458Chinaa SCSIO Key Laboratory of Ocean and Marginal Sea Geology South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China

The seafloor vector magnetometer is an effective tool for marine geomagnetic surveys and seafloor magnetotelluric(MT)detection.However,the noise,power consumption,cost,and volume characteristics of existing seafloor vector magnetometers are insufficient for practical use.Therefore,a low-noise,low-power-consumption seafloor vector magnetometer that can be used for data acquisition of deep-ocean geomagnetic vector components is developed and presented.A seafloor vector magnetometer mainly consists of a fluxgate sensor,data acquisition module,acoustic release module,glass sphere,frame,burn-wire release,and anchor.A new low-noise data acquisition module and a fluxgate sensor greatly reduce power consumption.Furthermore,compact size is achieved by integrating an acoustic telemetry module and replacing the acoustic release with an external burn-wire release.The new design and magnetometer characteristics reduce the volume of the instrument and the cost of hardware considerably,thereby improving the integrity and deployment efficiency of the equipment.Theoretically,it can operate for 90 days underwater at a maximum depth of 6000 m.The seafloor vector magnetometer was tested in the South China Sea and the Philippine Sea and obtained high-quality geomagnetic data.The deep-water environment facilitates magnetic field data measurements,and the magnetometer has an approximate noise level of 10 pT/rt(Hz)@1 Hz,a peak-to-peak value error of 0.2 nT,and approximate power consumption of 200 mW.The fluxgate sensor can measure the magnetic field in the lower frequency band and realize geomagnetic field measurements over prolonged periods.

关键词： seafloor vector magnetometer low noise low power consumption

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low power consumption 4-channel variable optical attenuator array based on planar lightwave circuit technique

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Chinese Physics B 2017年第7期26卷 192-197页

作者：任梅珍张家顺安俊明王玥王亮亮李建光吴远大尹小杰胡雄伟 State Key Laboratory on Integrated Optoelectronics Institute of Semiconductors Chinese Academy of Sciences College of Materials Science and Opto-Electronic Technology University of Chinese Academy of Sciences

The power consumption of a variable optical attenuator(VOA) array based on a silica planar lightwave circuit was investigated. The thermal field profile of the device was optimized using the finite-element analysis. The simulation results showed that the power consumption reduces as the depth of the heat-insulating grooves is deeper, the up-cladding is thinner,the down-cladding is thicker, and the width of the cladding ridge is narrower. The materials component and thickness of the electrodes were also optimized to guarantee the driving voltage under 5 V. The power consumption was successfully reduced to as low as 155 mW at an attenuation of 30 dB in the experiment.

关键词： variable optical attenuator planar lightwave circuit low power consumption thermal simulation

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Indium-organic framework CPP-3(In)derived Ag/In_(2)O_(3) porous hexagonal tubes for H_(2)S detection at low temperature

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Chinese Chemical Letters 2022年第1期33卷 551-556页

作者： Sihan Li Lili Xie Guifang Luo Yutong Han Ming Zhou Rawat Jaisutti Zhigang Zhu School of Medical Instrument and Food Engineering University of Shanghai for Science and TechnologyShanghai 200093China Shanghai Normal University Tianhua College Shanghai 201815China School of Environmental and Materials Engineering College of EngineeringShanghai Polytechnic UniversityShanghai 201209China Department of Physics Faculty of Science and TechnologyThammasat UniversityPathumthani 12120Thailand Thammasat Research Unit in Innovative Sensor and Nanoelectronic Devices Thammasat UniversityPathumthani 12120Thailand

There is a great demand for high-performance hydrogen sulfide(H_(2)S)sensors with low operating temperatures.Ag/In_(2)O_(3)hexagonal tubes with different proportions were prepared by the calcination of Ag+-impregnated indium-organic frameworks(CPP-3(In)),and the developed sensors exhibit enhanced gas-sensing performance toward H_(2)S.Gas sensing measurements indicate that the response of Ag/In_(2)O_(3)(2.5 wt%)sensor to 5 ppm H_(2)S has the highest response(119),operated at 70℃.The Ag/In_(2)O_(3)(2.5 wt%)based sensor exhibits short response time(20 s),low detection limit(300 ppb),and good selectivity toward H_(2)S gas,which imply that the CPP-3(In)-derived Ag/In_(2)O_(3)hexagonal tube is a promising candidate to be constructed a low power-consumption H_(2)S sensor.

关键词： Ag/In_(2)O_(3) Indium-organic framework(CPP-3(In)) H_(2)S Gas sensor low power consumption

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Graphene-based all-optical modulators

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Frontiers of Optoelectronics 2020年第2期13卷 114-128,F0004页

作者： Chuyu ZHONG Junying LI Hongtao LIN Key Laboratory of Micro-Nano Electronics and Smart System of Zhejiang Province College of Information Science and Electronic EngineeringZhejiang UniversityHangzhou 310027China School of Microelectronics Zhejiang UniversityHangzhou 310027China College of Optical-Electrical and Computer Engineering University of Shanghai for Science and TechnologyShanghai 200093China

All-optical devices,which are utilized to process optical signals without electro-optical conversion,play an essential role in the next generation ultrafast,ultralow power-consumption optical information processing systems.To satisfy the performance requirement,nonlinear optical materials that are associated with fast response,high nonlinearity,broad wavelength operation,low optical loss,low fabrication cost,and integration compatibility with optical components are required.Graphene is a promising candidate,particularly considering its electrically or optically tunable optical properties,ultrafast large nonlinearity,and high integration compatibility with various nanostructures.Thus far,three all-optical modulation systems utilize graphene,namely free-space modulators,fiber-based modulators,and on-chip modulators.This paper aims to provide a broad view of state-of-the-art researches on the graphene-based all-optical modulation systems.The performances of different devices are reviewed and compared to present a comprehensive analysis and perspective of graphene-based all-optical modulation devices.

关键词： graphene saturable absorption low power consumption all-optical modulation

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A low power cyclic ADC design for a wireless monitoring system for orthopedic implants

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Journal of Semiconductors 2009年第8期30卷 147-152页

作者：陈怡李福乐陈虹张春王志华 Tsinghua National Laboratory for Information Science and Technology Institute of MicroelectronicsTsinghua University

This paper presents a low power cyclic analog-to-digital convertor （ADC） design for a wireless monitoring system for orthopedic implants. A two-stage cyclic structure including a single to differential converter, two multiplying DAC functional blocks （MDACs） and some comparators is adopted, which brings moderate speed and moderate resolution with low power consumption. The MDAC is implemented with the common switched capacitor method. The 1.5-bit stage greatly simplifies the design of the comparator. The operational amplifier is carefully op- timized both in schematic and layout for low power and offset. The prototype chip has been fabricated in a United Microelectronics Corporation （UMC） 0.18-μm 1P6M CMOS process. The core of the ADC occupies only 0.12 mm2. With a 304.7-Hz input and 4-kHz sampling rate, the measured peak SNDR and SFDR are 47.1 dB and 57.8 dBc respectively and its DNL and INL are 0.27 LSB and 0.3 LSB, respectively. The power consumption of the ADC is only 12.5 μW in normal working mode and less than 150 nW in sleep mode.

关键词： monitoring system low power consumption small size analog to digital convertor single to differential convertor

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Serrated periodic electrode for high energy efficiency and large bandwidth acousto-optic modulators

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Chinese Optics Letters 2023年第3期21卷 77-83页

作者：吴季梁力屠科锋李锟影王梓吕国强 School of Instrumentation and Opto-Electronics Engineering Hefei University of TechnologyHefei 230009China CASTECH Inc. Fuzhou 350003China National Engineering Laboratory of Special Display Technology National Key Laboratory of Advanced Display TechnologyAcademy of Photoelectric TechnologyHefei University of TechnologyHefei 230009China

In an acousto-optic modulator,the electrode shape plays an important role in performance,since it affects the distribution of the acoustic field.The acousto-optic modulator based on the conventional rectangular electrode has the problems of low energy efficiency and small modulation bandwidth due to an imperfect acoustic field.In this paper,a new serrated periodic electrode has been proposed for using acousto-optic modulator transducers.The proposed electrode has the following advantages.By using serrated periodic electrodes to suppress the sidelobes,the collimation of the acoustic field in the direction perpendicular to the light incidence is improved.This makes the acousto-optic modulator have a stable diffraction efficiency fluctuation and high energy efficiency.In addition,the electrode has a large divergence angle in the direction of light incidence,so a large bandwidth can be obtained.The simulations and experiments demonstrate that the serrated periodic electrode has an increased bandwidth and high energy efficiency.

关键词： acousto-optic modulator serrated periodic electrode large bandwidth low power consumption

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A linear stepping PGA used in CMOS image sensors

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Journal of Semiconductors 2009年第2期30卷 57-60页

作者：徐江涛李斌桥赵士彬李红乐姚素英 School of Electronics and Information Engineering Tianjin University

A low power linear stepping digital programming gain amplifier （PGA） is designed for CMOS image sensors. The PGA consists of three stages with gain range from one to nine, The gain is divided into four regions and each range has 128 linear steps. power consumption of the PGA is saved by good tradeoff between variation of amplifier feedback coefficient, pipeline stages and gain regions. With thermometer-binary mixed coding and linear pipeline gain stepping, the load capacitance keeps constant when the gain of one stage is changed. The PGA is designed in the SMIC 0.18 μm process. Simulation results show that the power consumption is 3.2 mW with 10 bit resolution and 10 MSPS sampling rate. The PGA has been embedded in a 0.3 megapixel CMOS image sensors and fabricated successfully.

关键词： CMOS image sensor programmable gain amplifier linear stepping low power consumption

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A low power low noise analog front end for portable healthcare system

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Journal of Semiconductors 2015年第10期36卷 135-141页

作者：王艳朝柯可人秦文辉秦亚杰易婷洪志良 State Key Laboratory of ASIC & Systems Fudan University

The presented analog front end （AFE） used to process human bio-signals consists of chopping in- strument amplifier （IA）, chopping spikes filter and programmable gain and bandwidth amplifier. The capacitor- coupling input of AFE can reject the DC electrode offset. The power consumption of current-feedback based IA is reduced by adopting capacitor divider in the input and feedback network. Besides, IA＇s input thermal noise is decreased by utilizing complementary CMOS input pairs which can offer higher transconductance. Fabricated in Global Foundry 0.35 μm CMOS technology, the chip consumes 3.96 μA from 3.3 V supply. The measured input noise is 0.85μVrms （0.5-100 Hz） and the achieved noise efficient factor is 6.48.

关键词： AFE chopping IA low power consumption low noise NEF

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One-step solvothermal synthesis of indium oxide as liquefied petroleum gas sensor

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Journal of Shanghai University(English Edition) 2007年第4期11卷 407-410页

作者：徐甲强王晓华沈嘉年 College of Materials and Chemical Engineering Zhengzhou University of Light Industry Zhengzhou 450002 P. R. China Department of Chemistry College of SciencesShanghai University Shanghai 200444 P. R. China Institute of Materials Shanghai University Shanghai 200072 P. R. China

A liquefied petroleum gas （LPG） sensor with high selectivity, sensitivity and low power consumption has been developed based on indium oxide with very low resistance. Nanocrystalline In203 gas sensing materials were directly synthesized through a one-step controllable solvothermal process at 210 ℃ for 24 h, using InCI3.4H2O as the starting material, cetyltrimethyl ammonium bromide （CTAB） as additive and ethanol as the solvent. The obtained samples were characterized by X-ray diffraction （XRD）, and transmission electron microscopy （TEM）. The results showed that indium oxide takes on uniform cubic shape with range size of 10~30 nm and fine dispersivity. Gas sensitivity was measured in a mixing static gas. The results indicated that 3.0 V is the best working voltage of the sensor to LPG. Sensitivity is 12.6. The response-time and recovery-time are 3 s and 10 s respectively. power consumption is only around 200 mW.

关键词： solvothermal process In203 gas sensor low power consumption liquefied petroleum gas （LPG）.

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An Improved Wireless Sensor Network Routing Algorithm

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ZTE Communications 2015年第3期13卷 51-56页

作者： Shengmei Luo Xue Li Yiai Jin Zhixin Sun ZTE Corporation School of Internet of Things Nanjing University of Posts and Telecommunications

High performance with low power consumption is an essential factor in wireless sensor networks （WSN）. In order to address the issue on the lifetime and the consumption of nodes in WSNs, an improved ad hoc on-demand distance vector routing （IAODV） algorithm is proposed based on AODV and LAR protocols. This algorithm is a modified on-demand routing algorithm that limits data forwarding in the searching domain, and then chooses the route on basis of hop count and power consumption. The simulation results show that the algorithm can effectively reduce power consumption as well as prolong the network lifetime.

关键词： wireless sensor network low power consumption lifetime AODV LAR

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