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