Non-invasive DC Current Sensors

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  • Current measurement with magnetic sensors
    Hall Effect Current Sensors These devices have been developed to meet the growing requirement for accurate ' non - invasive 'measure- ment of large dc , ac and impulse currents.
  • 2009 Combined Subject Index [IEEE Industry Applications Society Publications]
    … I., +, APEC Feb. 2009 383-389 Design and realization of highly integrated isolated DC/ DC micro-converter. Deleage, O., +, ECCE Sept. 2009 3690-3697 Design methodology of a non - invasive sensor to measure the current of the output capacitor for a very fast non-linear control.
  • Integrated Circuits for Analog Signal Processing
    … threshold design, 202–206 supply voltage reduction, 206 threshold voltage, 202 transfer quality, 201 classification, biosensors challenges, 200–201 chemical sensors , 195 contacting, 195 high … … monitoring, 195 invasive and non - invasive , 195 minimally invasive, 195 … … wireless hospital network, 195 DC signal, 216 devices, use … See also Amplifiers analog signal processing applications, 290 CMOS IC technology, 7 design current mode filters, 300 …
  • A Low-Cost Current Transducer for Automotive Actuators
    Non - invasive current sensing is desirable in this application as resistive sensing of large currents incurs high losses and galvanic isolation may be needed for safety or to reduce susceptibility to electromagnetic interference. The Hall-effect sensor may sense both dc and ac currents, provides galvanic isolation and is virtually lossless.
  • Head & Face Medicine | Full text | Study on the clinical application of pulsed DC magnetic technology for tracking of intraoperative head motion during framele...
    That's why preliminary results with a DC (direct current ) magnetic navigation technique for tracking of the patient's head and target motion in frameless stereotaxy [19] have encouraged the authors to test a new sensor -based dynamic reference frame (DRF) which is designed … Different methods of non - invasive attachment dependent on the clinical need and indication, as well as the resulting accuracies in the clinical application have been analyzed.
  • Non-invasive sensing of the electrical energy harvested by medical implants powered by an ultrasonic transcutaneous energy transfer link
    The dc voltage of the implanted capacitor was remotely measured by converting the voltage to capacitance using a varactor (30–200 pF for 4-1 V), sweeping the current source frequency which is connected to the transmitting coil (2-6 MHz), and measuring … The proposed sensor can also be applicable for non - invasive transcutaneous measurements of other physiological signals, such as local pressure and temperature of organs.
  • Self-referencing optrodes for measuring spatially resolved, real-time metabolic oxygen flux in plant systems
    The SR sensing technique is an extension of the vibrating probe designed for non - invasive detection of bioelectric currents as small as 10 nA cm-2 s-1 from cells and tissues (Jaffe and Nuccitelli 1974). SR is based on operating a concentration sensor in accordance with Fick’s first law of diffusion: J = -D( DC /DX), where J analyte flux, D molecular diffusion constant, C analyte concen- tration, and X diffusionary distance.
  • Stress Induced Electric Field Measurements of Different Rock Lithology Using the Electric Potential Sensor
    The major benefits of this technology are: i.) it is made from conventional low cost components; ii.) it is a non - invasive system and draws no current and therefore detects very small … … bandwidth response, ranging from quasi dc to >100 MHz; iv … Thus far published data by the author has demonstrated that the EP Sensor can detect changes in …
  • Fully-integrated transimpedance amplifier for photoplethysmographic signal processing with two-stage Miller capacitance multiplier
    Introduction: Photoplethysmography (PPG) is a non - invasive method to measure volume changes in blood vessels using an optical sensor , which can be used to estimate blood pressure continuously [1]. The PPG signal consists of two components: an AC (iac) and DC (IDC) current with certain input range and a minute empirically determined ratio (iac/IDC) [2].
  • Active stator winding thermal protection for AC motors
    … are capable of providing accurate monitoring of the stator temperature without embedded thermal sensors , as shown in … … winding temperature estimation can be smaller than 3°C, depending on the magnitude of the injected dc signals. Only current and voltage measurements are required, which guarantees their non - invasive and cost-efficient nature.