Indian Journal of Science and Technology

Open Access Open Access  Restricted Access Subscription Access

Application of Wavelet Transform for Analysis of Radiated Electromagnetic Interference in a High Power Terawatt Laser Setup


Affiliations
1 Laser Electronics Support Division Raja Ramanna Centre for Advanced Technology, Indore 452013
2 A&MPD, BARC
3 L&PTD, BARC, Mumbai 400085, India
4 LPD, RRCAT, Indore-13
5 Laser Electronics Support Division Raja Ramanna Centre for Advanced Technology, Indore 452013, India
 

This paper reports the wavelet transform based time-frequency-intensity analysis of radiated electromagnetic noise generated by a flash lamp pumped terawatt class of high power pulsed laser. High power pulsed solid state lasers are widely used for research and industrial applications. Main electrical components of these lasers are flash lamp power supplies, electro-optic switches, timing and synchronization circuits, and control system. These sub-systems operate at different instants of time during the laser operation cycle. Range of the time delays between switching of various blocks in the system vary from 100 ns to hundreds of microseconds. The electromagnetic noise generated by the laser is pulsed type single shot event, which is measured in time domain. The conventional technique of Fourier transform generate frequency spectrum of the electromagnetic interference (EMI), however, it loses the time information and does not reveal the noise contributions by each of the sources and subsystem localized in time. In this work, wavelet transformations are applied on the measured signals to estimate frequency content of the noise contribution by each source and to generate the time-frequencyinformation. This technique helps in better identification and characterization of the electromagnetic noise sources in a high power laser chain and to achieve the growing demands for electromagnetic compatibility (EMC).

Keywords

Wavelet Transform, Flash Lamp Pumped Solid State Laser, Electromagnetic Interference (EMI)
User

  • Coppola L, Buso S, Liu Qian, Boroyevich D , Bell A (2005) Application of Fourier and wavelet transforms to the identification of EMI noise sources in SMPSs, International Symposium on Electromagnetic Compatibility, Vol. 2, pp. 584 – 589. DaubechiesI (1992) Ten lectures on wavelets Philadelphia, PA: SIAM.

  • Masugi Masao (2003) Multi-resolution analysis of Electrostatic Discharge Current From Electromagnetic Interference Aspects, IEEE Trans. EMC, Vol. 45, No. 2.

  • Becker K, Johnson J B and Edwards G, (1994) Broadband Pockels cell and driver for a Mark III-type free electron laser, Rev. Sci. Instrum., Vol. 65, Issue. 5, pp.1496-1501.

  • Naik P A, Gupta P D, Navathe C P, Sharma A K, Ansari M S, Raghuramaiah M, Kumbhare S R, Upadhyay J, Bundel H R, Mishra K K, Kushwaha R P and Joshi R A, (2003) Development of a chirped pulse amplification based Table Top Terawatt Nd: glass laser system, CAT Internal report, CAT/2003-28, CAT, Indore

  • Singh B, Ansari M S and Navathe C P (2006) Electronic Control Unit for Optical Parametric Chirped Pulse Amplification based Laser System, Proc. Sixth DAE-BRNS national laser symposium, Raja Ramana Centre for Advanced Technology, Indore, India, pp.25.

  • Torrence C, Compo G P, (1998)A Practical Guide to Wavelet Analysis, Bulletin of the American Meteorological Society,vol. 79, pp.61–78.


Abstract Views: 559

PDF Views: 87




  • Application of Wavelet Transform for Analysis of Radiated Electromagnetic Interference in a High Power Terawatt Laser Setup

Abstract Views: 559  |  PDF Views: 87

Authors

M. S. Ansari
Laser Electronics Support Division Raja Ramanna Centre for Advanced Technology, Indore 452013
S. V. G. Ravindranath
A&MPD, BARC
M. S. Bhatia
L&PTD, BARC, Mumbai 400085, India
R. K. Patidar
LPD, RRCAT, Indore-13
C.P. Navathe
Laser Electronics Support Division Raja Ramanna Centre for Advanced Technology, Indore 452013, India

Abstract


This paper reports the wavelet transform based time-frequency-intensity analysis of radiated electromagnetic noise generated by a flash lamp pumped terawatt class of high power pulsed laser. High power pulsed solid state lasers are widely used for research and industrial applications. Main electrical components of these lasers are flash lamp power supplies, electro-optic switches, timing and synchronization circuits, and control system. These sub-systems operate at different instants of time during the laser operation cycle. Range of the time delays between switching of various blocks in the system vary from 100 ns to hundreds of microseconds. The electromagnetic noise generated by the laser is pulsed type single shot event, which is measured in time domain. The conventional technique of Fourier transform generate frequency spectrum of the electromagnetic interference (EMI), however, it loses the time information and does not reveal the noise contributions by each of the sources and subsystem localized in time. In this work, wavelet transformations are applied on the measured signals to estimate frequency content of the noise contribution by each source and to generate the time-frequencyinformation. This technique helps in better identification and characterization of the electromagnetic noise sources in a high power laser chain and to achieve the growing demands for electromagnetic compatibility (EMC).

Keywords


Wavelet Transform, Flash Lamp Pumped Solid State Laser, Electromagnetic Interference (EMI)

References





DOI: https://doi.org/10.17485/ijst%2F2012%2Fv5i11%2F30655