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This paper explores the possibility of turning the cellular radio modem into a passive body motion sensor. Sensing is herein based on the real-time analysis of cellular radio propagation. Unlike WiFi and Bluetooth, all cellular radios are never disconnected as, even in idle mode state, they perform continuous and autonomous measurements of the propagation conditions, namely the cellular signal quality...
The requirements for wearables and portable medical devices present a number of challenges in terms of integration, autonomy and connectivity, and demand a careful co-design of hardware and software to reach optimum performance. This paper addresses these challenges by way of some recent examples of ASICs designed for ECG, EIT (Electrical Impedance Tomography) and PPG (Photoplethysmography) sensors...
With the appearance of wearable devices and the IoT, energy harvesting nodes are becoming more and more important. The design and evaluation of these small standalone sensors and actuators, which harvest limited amounts of energy, requires novel tools and methods. Fast and accurate measurement systems are required to capture the rapidly changing harvesting scenarios and characterize leakage currents...
In the complex rotor bearing systems all the components and control are interdependent. Changes in one non-modular element might require complete system redesign. Research on high-speed levitated blowers, pumps and compressors requires ability to test effectively different, often novel or customized, hardware and software components. This work introduces the laboratory test rig of modular construction...
This paper presents the method of monitoring the performance and yield of individual photovoltaic (PV) panels in a PV plant using Wireless Sensor Networks (WSN). The parameters monitored are Open circuit Voltage(Voc), Open circuit Current(Ioc), Short circuit Voltage(Vsc), Short circuit Current(Isc) pertaining to the panels connected to a string, without affecting their operation. Apart from the currents...
We report the fabrication and use of carbon fiber (CF) arrays with 8 recording electrodes having individual diameters of 8–10 μm (9–10 times smaller than conventional sensors and state of art) for electrochemical recording of dopamine from deep brain regions in a minimally invasive and high density manner. Accordingly, key advancements demonstrated are (1) radical reduction in size and (2) potential...
During well logging operations, the depth of a logging tool is usually obtained from measuring the length of the wireline cable that suspends the tool in the well. In some cases, a secondary depth reference is obtained by detecting the collars along the casing pipe which lines the well. For small, untethered sensor platforms neither method is practical. This paper describes an inductive sensor which...
The design and implementation studies of a remote monitoring system are presented in this study. The proposed design is improved in terms of smart metering infrastructure based on current, voltage, and power measurements. The communication among the photovoltaic (PV) panels and host PC is performed by designed ZigBee transceiver system. Sensing circuits are very important devices to measure for both...
In practice often multiple control applications share a communication channel, requiring a smart and scalable scheduling mechanism to coordinate the access to the capacity-limited communication medium. In this paper, we propose a decentralized event-triggered medium access control (MAC) for multiple feedback control loops which are coupled through a capacity-limited communication medium. The individual...
Rescue and salvage works are often carried out under the sea in harsh conditions. The position and attitude of under platforms may change at any time by ocean currents, thus produces great difficulties for underwater search and fixed-point rescue. This paper aims to realize the efficient control of underwater platform attitude and effectively improve the operation efficiency of underwater platforms...
To provide daily-life assistance appropriately by a service robot, the management of houseware's information in a room or a house is an indispensable function. Especially, the information about what and where objects are in the environment are fundamental and critical knowledge. We can track housewares with high reliability by attaching markers such as RFID tags to them, however, markerless housewares...
In this study a new noise source is proposed as a one of renewable energy sources in energy harvesting. Disk Jokey (DJ) is a common device in celebrations and other events. Converting the produced noise from DJ to electric energy by using a suitable piezoelectric transducer is the main aim of this study. Piezoelectric sensors are used to convert the sound waves to electric charges. Piezoelectric sensor...
We present a novel non-invasive current measuring platform that estimates the current through a bundled cable. The sensor platform contains eight three axis magnetometer breakout sensors. We develop a regression model to estimate the current flowing in the wire using captured data from the sensor platform. The model in the paper demonstrated accurate results for current estimation of two core wire...
Smart Grid concept substantially increases the measurement need in the future for efficient and flexible power delivery. Distribution network monitoring has been traditionally focused on primary substation (i.e., high voltage/medium voltage), whereas least attention has been given to secondary substation (i.e., medium voltage/low voltage). Distribution network operators are facing considerable network...
In this paper, an improved power quality 18-pulse voltage source converter is proposed for back-to-back (BTB) high voltage direct current (HVDC) system. The proposed system is regulated using PI controller for which controller gains are selected using Ziegler Nichols approach for different transient conditions. The calculated controller gains are utilized with current regulated approach with reduced...
The RFECT(Remote Field Eddy Current Testing) is based on a phenomenon that occurs around a solenoidal exciter coil and receiving sensor coils in conductive pipe. There is remote field zone in which the eddy current distributions are concentrated on the outer pipe wall. So, it is possible to detect a defect which occurs on the outer surface of pipe wall even if receiving coils are located in the interior...
The grating eddy current sensor is based on the principle of lateral eddy current. Its precision is greatly influenced by the coil and reflector parameters. It is important to analyze and optimize those parameters so as to improve the precision. Therefore, it is necessary to make further research on how the sensor nonlinear error is influenced by parameters, such as reflector size, shape and coil...
Multi-phase permanent magnet synchronous motors (PMSM) are widely used in electric vehicles owing to their merits such as high efficiency, high precision and high reliability. This paper presents a novel dual measurement vector injection method (DMVIM) for dual three-phase PMSM using two hall-effect DC link current sensors. The principle of phase current reconstruction method is described as well...
Metallic needle protrusions were investigated experimentally on the ground side of a commercial coaxial GIS duct regarding their PD characteristics in time domain. DC voltages of up to 400 kV were applied to the SF6-insulated arrangement at pressures in the range of 100 … 500 kPa. Specimen of needles featured tip radii in the range of micrometers; protrusion length was in the range of few millimeters...
A new current-mode sense amplifier is presented. It utilizes the positive feedback scheme to enhance stability and enlarge the voltage swing of bit-lines. Comparing with the referenced sense amplifier, the new structure could work in large scale circuits correctly and efficiently. And the average power consumption and area are reduced. Extensive simulations, based on 65-nm CMOS technology, have verified...
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