expt
DESCRIPTION
mbmmnTRANSCRIPT
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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
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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
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List of Figures
1.1 Attenuation charactrestic of glass fibre and anti solarization fibre . . . 2
1.2 Block Diagram of Experimental setup . . . . . . . . . . . . . . . . . . 3
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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.
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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
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Figure 1.2: Block Diagram of Experimental setup
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