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SmartHat: A battery-free worker safety device employing passive UHF RFID technology

Stewart Thomas, Jochen Teizer, Matthew Reynolds
2011 2011 IEEE International Conference on RFID  
Energy harvesting and communications techniques based on passive UHF RFID technology may offer an alternative to battery power for some types of safety alert devices, particularly where hazardous conditions  ...  This device is designed to be integrated with plastic hard hats that are commonly used in the construction industry to yield an intelligent hard hat, called a "SmartHat", that delivers an audible alert  ...  For many types of heavy equipment an external DC-DC converter would be required to convert a 24 -48 V vehicle power source to the 12 V interrogator supply level.  ... 
doi:10.1109/rfid.2011.5764606 fatcat:73opjxcrtbharfe7afvwnzvh74

Portable and Highly Versatile Impedance Meter for Very Low Frequency Measurements

Graziella Scandurra, Antonella Arena, Emanuele Cardillo, Gino Giusi, Carmine Ciofi
2021 Applied Sciences  
for measurements at very low frequencies, although commercially available, is less common.  ...  In our approach, we exploit a personal computer and a soundboard as a powerful system for digital signal generation and analysis that, with the help of low complexity and low-cost external hardware and  ...  The USB audio interface Behringer UMC202HD was used as the audio board configured for 24 bit and 48 kHz sampling frequency. All measurements were performed with R R = 1 kΩ an C R = 680 nF.  ... 
doi:10.3390/app11178234 fatcat:zbp4dbbajreojkfasdesmfsjxa

Magneto-acoustic sensors for measurement of liquid temperature, viscosity and density

M.K. Jain, S. Schmidt, C.A. Grimes
2001 Applied Acoustics  
We report on a novel acoustic method for measurement of liquid temperature, viscosity and density using magneto-acoustic sensors.  ...  These oscillations are strongest at the characteristic resonant frequency of the sensor, which shifts linearly in response to temperature and, when immersed in a liquid, the damping forces associated with  ...  The authors would like to thank Reviewer X for his/her helpful comments, and for pointing out that the size of the sensor changes with temperature.''  ... 
doi:10.1016/s0003-682x(00)00091-8 fatcat:jcmzni2zijaahob67umoesxvte

Distributed optical fibre audible frequency sensor

Ali Masoudi, Mohammad Belal, Trevor P. Newson, José M. López-Higuera, Julian D. C. Jones, Manuel López-Amo, José L. Santos
2014 23rd International Conference on Optical Fibre Sensors  
The demonstrated sensor detects multiple dynamic perturbations simultaneously within a frequency range of 200 to 5000 with a frequency resolution of 10 and a spatial resolution of 1 .  ...  This variation of phase difference, Δϕ, is converted to an intensity change by an unbalanced Mach-Zehnder interferometer (MZI).  ...  In this paper, by optimizing the concept used for dynamic strain sensor, a DOFS is demonstrated for the first time which is capable of simultaneously detecting multiple audio frequencies(200Hz to 5kHz)  ... 
doi:10.1117/12.2058484 fatcat:blxa4o6pybbl7ngyw4xky4blhm

Towards the Realization of Graphene Based Flexible Radio Frequency Receiver

Maruthi Yogeesh, Kristen Parrish, Jongho Lee, Saungeun Park, Li Tao, Deji Akinwande
2015 Electronics  
We report on our progress and development of high speed flexible graphene field effect transistors (GFETs) with high electron and hole mobilities (~3000 cm 2 /V· s), and intrinsic transit frequency in  ...  This RF communication system consists of graphite patch antenna at 2.4 GHz, graphene based frequency translation block (frequency doubler and AM demodulator) and graphene speaker.  ...  Devices with channel length of 0.25 µm and an effective width of 60 µm (six fingers with 10 µm width) are prepared for electrical measurements, which can afford GHz high frequency performance.  ... 
doi:10.3390/electronics4040933 fatcat:nchjbvqxefgs5j6xtg75xubocu

Superheterodyne-inspired waveguide-integrated metasurfaces for flexible free-space light manipulation

Geng-Bo Wu, Shu-Yan Zhu, Stella W. Pang, Chi Hou Chan
2022 Nanophotonics  
Inspired by the superheterodyne principle in radio communications, here we propose a new waveguide-integrated metasurface architecture capable of converting in-plane guided modes into any desired out-of-plane  ...  It provides a paradigm shift of metasurface designs and empowers integrated photonic devices with extraordinary free-space interactivity capability, enabling a broad spectrum of applications in communications  ...  Kam Man Shum at the State Key Laboratory of Terahertz and Millimeter Waves (City University of Hong Kong) for their help in measurement.  ... 
doi:10.1515/nanoph-2022-0352 fatcat:ngzb7bbvyvf4bosvagz257twg4

Kinetic and thermal energy harvesters for implantable medical devices and biomedical autonomous sensors

Andrea Cadei, Alessandro Dionisi, Emilio Sardini, Mauro Serpelloni
2013 Measurement science and technology  
This paper reviews the state-of-art in kinetic and thermoelectric energy harvesters for powering implantable medical devices.  ...  The energy harvesters here reported produce a power between 6 nW and 7.2 mW; these values are comparable with the supply requirements of the most common implantable medical devices; this demonstrates that  ...  The device was tested in the laboratory by using an audio speaker at a resonance frequency of about 0.3 Hz to simulate the abdominal body motion; in this condition, the generator produced a power of about  ... 
doi:10.1088/0957-0233/25/1/012003 fatcat:tu6gvmu52jeljibzwa37errmhi

High-Speed Microscale Optical Tracking Using Digital Frequency-Domain Multiplexing

R.A. MacLachlan, C.N. Riviere
2009 IEEE Transactions on Instrumentation and Measurement  
This paper describes the instrument design for multidimensional position and orientation measurement based on the simultaneous position measurement of multiple modulated sources using frequency-domain-multiplexed  ...  As an example, we characterize the resolution, speed, and accuracy of an instrument that measures the position and orientation of a 10 mm × 5 mm probe in 5 degrees of freedom (DOF) over a 30-mm cube with  ...  It is a large-area planar photodiode with high-resistivity contacts.  ... 
doi:10.1109/tim.2008.2006132 pmid:20428484 pmcid:PMC2860315 fatcat:hbnqqcevinbnjafgdae5f2ra5e

Application of the Josephson effect in electrical metrology

B. Jeanneret, S. P. Benz
2009 The European Physical Journal Special Topics  
Two different systems have dramatically improved precision measurements for audio-frequency voltages and for electric power metrology. a  ...  dc and ac voltage measurements.  ...  ACJVS systems are used primarily for audio-frequency applications, especially for calibration of thermal voltage converters.  ... 
doi:10.1140/epjst/e2009-01050-6 fatcat:4zujtawrdjchlbzryqcwoi3kj4

Millimeter Wave Multi-Port Interferometric Radar Sensors: Evolution of Fabrication and Characterization Technologies

Serioja Ovidiu Tatu, Emilia Moldovan
2020 Sensors  
This requires an increased effort in design and fabrication, but it allows miniaturization, low-power consumption, while keeping very good overall performances.  ...  In combination with the standard rectangular wave-guide technology, these offer great opportunities for prototyping and testing of future millimeter wave transceivers or front-ends, which integrate antenna  ...  The millimeter wave signal is obtained with an Anritsu frequency multiplier (6×) from a microwave source (15.66 GHz) and amplified with a 23 dB power amplifier (PA).  ... 
doi:10.3390/s20195477 pmid:32987889 fatcat:22iizrzrlvbwxp5xpgsucd64du

CALCON 2020 Table of Contents

2020 2020 IEEE Calcutta Conference (CALCON)  
Longitudes to HSSW Driven Geomagnetic Storm Outage Analysis in Dual Hop Relay Network with an Adaptive Energy Harvesting Scheme Single-Phase Average Power Measurement Using Instantaneous Power Theory  ...  in a Fixed Point Processor An Axis Based Mean Filter for Removing High-Design of Reconfigurable Planar Yagi-Uda Antenna for Dual Frequency Wireless Communication Intensity Salt and Pepper Noise Boundary  ... 
doi:10.1109/calcon49167.2020.9106478 fatcat:lkovpkzwl5ahfgp2f3jlcxx5uy

National Conference on Recent Advances in Communication Engineering and Information Technology

2020 International journal for innovative engineering and management research  
We provide a broad-based engineering curriculum, with opportunities for specialization and self-directed learning and development.  ...  Our first mission is to educate Electronics and Communication engineers for Indian and Global industries.  ...  A low peak power optical heat flux modulated by a band of low frequencies is deposited on the front side of the sample and an infrared camera is used to analyze the respective thermal response.  ... 
doi:10.48047/ijiemr/v08/spe/02 fatcat:woay334irjgebf5bixuc4ng6em

Table of Contents

2022 IEEE Transactions on Circuits and Systems - II - Express Briefs  
Rincón-Mora An Incremental-ADC With 106-dB DR for Reconfigurable Class-D Audio Amplifiers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  ...  Singh An Invar Alloy SLM Printed Diplexer With High Thermal Stability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  ... 
doi:10.1109/tcsii.2022.3150651 fatcat:trtezarnqre4xhjklggje6zvoy

A low-noise differential microphone inspired by the ears of the parasitoid flyOrmia ochracea

R. N. Miles, Q. Su, W. Cui, M. Shetye, F. L. Degertekin, B. Bicen, C. Garcia, S. Jones, N. Hall
2009 Journal of the Acoustical Society of America  
The differential microphone diaphragm measures 1 ϫ 2 mm 2 and is fabricated out of polycrystalline silicon.  ...  The sensitivity of a differential microphone suffers as the distance between the two pressure sensing locations decreases, resulting in an increase in the input sound pressure-referred noise floor.  ...  Color online͒ The measured directivity pattern of the diaphragm along with the figure eight pattern expected for an ideal differential microphone.  ... 
doi:10.1121/1.3082118 pmid:19354377 pmcid:PMC2677264 fatcat:litibtn5tbcmxifvhdjowfhemq

Terahertz wireless communications [chapter]

J.F. Federici, L. Moeller, K. Su
2013 Handbook of Terahertz Technology for Imaging, Sensing and Communications  
The bit-error rate (BER), signal-to-noise ratio (SNR) and power on the receiver side have been measured, which describe the signal performance.  ...  high data rate and higher output power.  ...  Figure 2 . 6 26 Schematic of up converting frequency multiplier chain based 625 GHz transmission link.2.2.1 THz SourceThe THz source (Virginia Diodes Inc.) is based on a Frequency-Multiplier-Chain with  ... 
doi:10.1533/9780857096494.1.156 fatcat:2qzfaetnufeztbtx4rb5bwtaau
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