Analysis of Magneto-inductive System for Rocket Sled Velocity Measurement Beyond Mach 1.5

  • P. K. Khosla Terminal Ballistics Research Laboratory, Chandigarh
  • Rajesh Khanna Thapar Institute of Engineering and Technology, Patiala
  • Sanjay Prakash Sood Centre for Development of Advanced Computing, Mohali
Keywords: Magneto-inductive, sensor, sled velocity, supersonic velocity, rail track, rocket sled, magnetokinematic


The rail track rocket sled (RTRS) national test facility at Terminal Ballistics Research Laboratory (TBRL) has been established to provide simulated flight environment for carrying out aero dynamic studies, terminal studies and kinematic studies of variety of test articles. The sled velocity is a critical parameter in evaluation trials.  This velocity is also used to ensure that the maximum speed and allowable g loading does not exceed the value which the test article will experience under free flight in air1. Overseas, the facilities have been set up to attain velocities ranging from sub-sonic to hypersonic2. The rocket sled at TBRL can be presently accelerated to travel along the rail track at velocities up to 500 m/s and capability is being built to increase velocity beyond 500 m/s. Signals acquired from existing magneto-inductive arrangement have been analysed in the present work. The experiments indicate that with increase in velocity the rate of change of flux increases, the amplitude of induced emf also increases but terminal voltage decreases and shape of the acquired pulse gets distorted. The parameters of magneto-inductive pick up have been modified in such a way that there is improvement in amplitude and shape of the received pulse with increase in velocity. The improved signals have been analysed and simulation results validated with feasible experiments. This paper also discusses issues, challenges and proposes recommendations in improving the sensor for measurement of velocity beyond Mach 1.5. It has been found that it is prudent to reduce the inductance by reducing the number of turns and changing the core from soft iron core to air core which will improve the response of inductive pick up coil at high velocity.

Defence Science Journal, 2014, 64(2), pp. 143-151. DOI:

Author Biographies

P. K. Khosla, Terminal Ballistics Research Laboratory, Chandigarh

Mr P.K. Khosla has passed MTech (ECE) from Kurkshetra University. He is presently working as Group Director of Rail Track Rocket Sled National Test Facility of TBRL and Group Director (Automation & Networking). His current interests include velocimetry and working on various elements to double the speed of rocket sled from present capability of Mach 1.5. He is recipient of DRDO Award for Performance Excellence - 2006 and National Technology Day Award - 2012.

Rajesh Khanna, Thapar Institute of Engineering and Technology, Patiala
Dr Rajesh Khanna received his ME (Electrical Communication) from Indian Institute of Science, Bangalore, in 1998 and PhD (Wireless Communications) from Thapar University, in 2006. Presently he is working as Professor in the Department of Electronics and Communication at Thapar Institute of Engineering and Technology, Patiala. He has published more than 30 paper in International Journals. He has guided more than 60 ME theses and guiding 10 PhD students. His research interest includes wireless and mobile communication, and antennas.
Sanjay Prakash Sood, Centre for Development of Advanced Computing, Mohali
Dr Sanjay P. Sood obtained his PhD in Information Technology.  Currently, as the Head & Principal Consultant, State eGovernance Mission (Chandigarh Administration) in the Union Territory of Chandigarh. He has ben the founder Director at C-DAC School of Advanced Computing in Mauritius. He has conceptualized and lead program management, project implementations, research and development including academics in the domain of healthcare IT and eGovernance. He has authored over 60 articles including five book chapters on cutting edge applications of IT in healthcare.
How to Cite
Khosla, P., Khanna, R., & Sood, S. (2014). Analysis of Magneto-inductive System for Rocket Sled Velocity Measurement Beyond Mach 1.5. Defence Science Journal, 64(2), 143-151.
Electronics & Communication Systems