• A Busbar Current Sensor With Frequency Compensation 

      Autor: Grim, V.; Petrucha, V.; Ripka, P.
      (IEEE, 2017)
      DC/AC yokeless galvanically insulated electric current sensors are required for applications, e.g., in automotive and aerospace engineering, where size, weight, and/or price are strictly limited. A busbar current sensor ...
    • Advances in Magnetic Field Sensors 

      Autor: Ripka, Pavel; Janošek, Michal
      (IEEE, 2010-06)
      The most important milestone in the field of magnetic sensors was when AMR sensors started to replace Hall sensors in many applications where the greater sensitivity of AMRs was an advantage. GMR and SDT sensors finally ...
    • Bi-Metallic Magnetic Wire With Insulating Layer as Core for Orthogonal Fluxgate 

      Autor: Butta, M.; Ripka, P.; Infante, G.; Badini-Confalonieri, G. A.; Vázquez, M.
      (IEEE, 2009-10)
      In this paper, we examine the problems related to orthogonal fluxgates realized using magnetic microwires as core. Starting from a description of orthogonal fluxgates evolution, we give a theoretical analysis of the problems ...
    • Busbar current transducer with suppression of external fields and gradients 

      Autor: Ripka, Pavel; Chirtsov, Andrey
      (IEEE, 2018)
    • Contactless Piston Position Transducer With Axial Excitation 

      Autor: Ripka, P.; Chirtsov, A.; Grim, V.
      (IEEE, 2017)
      Existing piston position transducers require either drilling precise hole into the piston bar, or mounting permanent magnets or measuring device inside the pressurized cylinder. We present a new solution for aluminum ...
    • Crossfield Sensitivity in AMR Sensors 

      Autor: Ripka, Pavel; Janošek, Michal; Butta, Mattia
      (IEEE, 2009-10)
      We discuss the origin of the crossfield sensitivity of AMR sensors, the way how this error may influence the performance of an AMR compass and methods for its correction. Finally, we confirm the simple formulas experimentally. ...
    • Current Sensor in PCB Technology 

      Autor: Ripka, Pavel; Kubík, Jan; Duffy, Maeve; Hurley, William Gerard; O’Reilly, Stephen
      (IEEE, 2005-06)
      A novel DC/AC current sensor works on the fluxgate principle. The core in the form of a 7/10-mm ring made of electrodeposited permalloy is sandwiched in the middle of a printed circuit board (PCB), whereas the sensor ...
    • Double Coil-Less Fluxgate in Bridge Configuration 

      Autor: Butta, M.; Ripka, P.; Navarrete, Joaquín Pérez; Vázquez, M.
      (IEEE, 2010-02)
      In this paper, a new method for excitation of coil-less fluxgate is presented. The purpose of this method is to reduce the spurious component of the output voltage, allowing us to increase the amplification. The method is ...
    • Double-Core GMI Current Sensor 

      Autor: Malátek, Michal; Ripka, Pavel; Kraus, Luděk
      (IEEE, 2005-10)
      A novel design of the giant magnetoimpedance contactless current sensor is presented. A double-core structure is used in order to improve the temperature stability. The temperature coefficient of sensitivity and offset ...
    • The effect of conductor permeability on electric current transducers 

      Autor: Mirzaei, Mehran; Ripka, Pavel; Chirtsov, Andrey; Kašpar, Petr; Vyhnánek, Jan
      (American Institute of Physics, 2018)
      In this paper, experimental works and theoretical analysis are presented to analyze the influence of the conductor permeability on the precision of yokeless current sensors. The results of finite-element method (FEM) fit ...
    • Effect of speech activity parameter on PESQ's predictions in presence of independent and dependent loses 

      Autor: Počta, P.; Holub, J.
      (2013)
      This paper deals with the investigation of PESQ's (Perceptual Evaluation of Speech Quality; also known as ITU-T Recommendation P.862) behavior under independent and dependent loss conditions from a speech activity parameter ...
    • Evaluation of Objective Speech Transmission Quality Measurements in Packet-based Networks 

      Autor: Slavata, O.; Holub, J.
      (2013)
      This paper presents an analysis of the relation between IP channel characteristics and final voice transmission quality. The NISTNet emulator is used for adjusting the IP channel network. The transmission quality criterion is ...
    • Excitation and Temperature Stability of PCB Fluxgate Sensor 

      Autor: Tipek, Alois; O’Donnell, Terence; Ripka, Pavel; Kubík, Jan
      (IEEE, 2005-12)
      Printed circuit board (PCB) integrated inductors have been adapted for operation as fluxgate sensors. A ring core is made from an electrodeposited permalloy thin film and is sandwiched between the layers of the PCB. The ...
    • Fluxgate sensor with increased homogeneity 

      Autor: Ripka, Pavel; Jireš, František; Macháček, Milan
      (IEEE, 1990-09)
      Several types of fluxgate sensors were developed for measuring microvariations of the earth's magnetic field. Sensor cores were produced by etching, leading to better geometric homogeneity and long-term stability. This ...
    • Fluxgate: Tuned vs. Untuned Output 

      Autor: Ripka, Pavel; Billingsley, S.W.
      (IEEE, 1998-07)
      Fluxgate voltage output contains information about the measured DC magnetic field in amplitude of even harmonic components. Tuning the sensor output causes the concentration of output energy to specific harmonics (usually ...
    • Giant Magnetoimpedance Sensors 

      Autor: Hauser, Hans; Kraus, Luděk; Ripka, Pavel
      (IEEE, 2001-06)
      Magnetoinductance and giant magnetoimpedance (GMI) sensors have greatly benefited from the development of amorphous wires. These soft ferromagnetic substances exhibit exquisite sensitivity (in the nT range) and wide bandwidth ...
    • Impact of Different Active-Speech-Ratios on PESQ’s Predictions in Case of Independent and Dependent Losses (in Presence of Receiver-Side Comfort-Noise) 

      Autor: Počta, P.; Holub, J.; Vlčková, H.; Polková, Z.
      (2010)
      This paper deals with the investigation of PESQ’s behavior under independent and dependent loss conditions from an Active-Speech-Ratio perspective in presence of receiver-side comfort-noise. This reference signal ...
    • Impact of Different Active-Speech-Ratios on PESQ’s Predictions in Simulated VoIP Environment 

      Autor: Počta, P.; Holub, J.; Mrvová, M.
      (2009)
      In this work, we experimentally study how behaviour of the PESQ predictions varies with reference signal characteristic. In particular we investigate the impact of different Active-Speech-Ratios on speech quality ...
    • Inductance position sensor for pneumatic cylinder 

      Autor: Ripka, Pavel; Chirtsov, Andrey; Mirzaei, Mehran; Vyhnánek, Jan
      (American Institute of Physics, 2018)
      The position of the piston in pneumatic cylinder with aluminum wall can be measured by external inductance sensor without modifications of the aluminum piston and massive iron piston rod. For frequencies below 20 Hz the ...