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  • Documentation of Instruments Required for Corona

    Discharge Spectroscopy

    Submitted by,

    Ganesh Avhad

    (Roll no. 134070002)

    Under the guidance of,

    Prof. S. V. Kulkarni

    &

    Prof. Himanshu Bahirat

    Department of Electrical Engineering

    Indian Institute of Technology Bombay

    Mumbai, 400076

    Feb 2016

  • Contents

    List of Figures iii

    1 Introduction 1

    1.1 Corona Discharge Setup . . . . . . . . . . . . . . . . . . . . . . . . . 1

    1.2 Optical Signal Analysis Setup . . . . . . . . . . . . . . . . . . . . . . 1

    1.2.1 Collamator . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

    1.2.2 Anti Solarization fibre . . . . . . . . . . . . . . . . . . . . . . 2

    1.2.3 Spectrometers . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

    ii

  • List of Figures

    1.1 Attenuation charactrestic of glass fibre and anti solarization fibre . . . 2

    1.2 Block Diagram of Experimental setup . . . . . . . . . . . . . . . . . . 3

    iii

  • Chapter 1

    Introduction

    Corona discharge in air produces optical signal in the ultra violet region,ultra sonic

    waves, thermal signatures and radio waves in the range of 0.2 to 10 MHz. Optical

    signals generated by discharge will be analysed with the help of spectrometer. Ther-

    mal signatures will be alnalysed using thermal imaging camera, audio signatures by

    using fibre optic interferrometer and radio waves by using antenna reciver.

    1.1 Corona Discharge Setup

    For production of corona discharge point and plane electrode geometry is used. AC

    voltage of 100 KV is apllied between the electrodes. The elctric field field produced

    between the electrodes is non uniform in nature.

    1.2 Optical Signal Analysis Setup

    Optical signal generated by corona discharge is focused into the anti solarization

    fibre with the help of quartz collamator. Then the collected light is guided to the

    spectrometer for analysis.

    1.2.1 Collamator

    Ultra violet light is easily absorbed by glass material hence to prevent absorption

    quartz material is used.

    1

  • 1.2.2 Anti Solarization fibre

    Normal glass fibre has higher attenuation in ultra violet region as compared to anti

    solarization fibre as shown in Fig.1.1

    Figure 1.1: Attenuation charactrestic of glass fibre and anti solarization fibre

    1.2.3 Spectrometers

    Most of them spectrometer gets saturated in ultra violet region. The block diagram

    Table 1.1: Spectrometers

    Spectrometer Manufacturer Range

    USB 4000 Ocean Optics 190 to 890 nm

    USB 4000 Ocean Optics 210 to 445 nm

    HR 2000+ Ocean Optics 190 to 1090 nm

    Auaspec 2048L Aventes 200 to 1100 nm

    of experimental setup is as shown in Fig.1.2

    2

  • Figure 1.2: Block Diagram of Experimental setup

    3