Sökning: "Frequency Domain Measurement"

Visar resultat 1 - 5 av 83 avhandlingar innehållade orden Frequency Domain Measurement.

  1. 1. Ultra-Wideband Time Domain Measurement Systems for Microwave Tomography

    Författare :Xuezhi Zeng; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Time DomainMeasurement; Ultra-Wideband; EquivalentTime Sampling; Real Time Sampling; Microwave Tomography; Measurement Error; Frequency Domain Measurement;

    Sammanfattning : As a potential imaging modality for biomedical applications, microwave tomography has attracted a lot of interests in recent years. With microwave tomography, microwave signals are transmitted into the biological tissues and the scattered fields are recorded. LÄS MER

  3. 2. Time and Frequency Domain Measurement Methods for High Frequency Characterisation of Power Cables

    Författare :Ruslan Papazyan; KTH; []
    Nyckelord :Attenuation measurement; XLPE insulation; Power cables;

    Sammanfattning : Time Domain Reflectometry (TDR) has been used forlocalisation of transmission line discontinuities in variousapplications. One of the challenges when applying TDR on powercables is to obtain knowledge of the high frequencycharacteristics of both the degraded and the undegradedsections of the cable. LÄS MER

  4. 3. Advanced characterization techniques of photonic devices with frequency combs

    Författare :Krishna Sundar Twayana; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; electro-optic combs; multi-heterodyne; optical frequency domain spectroscopy; stepped-heterodyne; swept-wavelength interferometry; microcombs; waveguides; microresonators; frequency combs;

    Sammanfattning : Integrated photonics has witnessed remarkable progress in the last decades. Measuring photonic devices in amplitude and phase provides insight into their performance. Swept wavelength interferometry is a prominent technique for the broadband characterization of the complex response. LÄS MER

  5. 4. An FRA Transformer Model with Application on Time Domain Reflectometry

    Författare :Hanif Tavakoli; Göran Engdahl; Jonas Ekman; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; complex permeability; lumped circuit model; frequency response analysis; time domain reflectometry; high frequency modeling; transformer diagnosis; reluctance network method.;

    Sammanfattning : Frequency response analysis (FRA) is a frequency-domain method which is used to detect mechanical faults in transformers. The frequency response of a transformer is determined by its geometry and material properties, and it can be considered as the transformer’s fingerprint. LÄS MER

  7. 5. Brownian Relaxation Measurements of Magnetic Nanoparticles: Towards the Development of a Novel Biosensor System

    Författare :Andrea Prieto Astalan; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; PSA; Magnetic susceptibility; Brownian relaxation; Biosensor; Prostate specific antigen; Magnetic nanoparticles; Frequency domain; Induction coils; Time domain;

    Sammanfattning : Magnetic measurements of the Brownian relaxation time of thermally blocked magnetic nanoparticles dispersed in a solution have been performed in order to determine the hydrodynamic size distribution of the particles. By measuring changes in the hydrodynamic size of the particles, the ammount of analytes attached to the surface of particles can be determined. LÄS MER