V. V. Rangari

Department of Physics, R.T.M. Nagpur University, Nagpur - 440033 India

A. P. Bhat

Depatrment of Electronics, R.T.M. Nagpur University Nagpur - 440033 India

V. A. Joshi

Department of Instrumentation, V.P.M’s. Polytechnic, Thane, India

S. J. Dhoble

Department of Physics, R.T.M. Nagpur University, Nagpur - 440033 India