Particle Velocity in Detonation and Its Determination

Detonation, Particle Velocity in and Its Determination. Particle velocity also called material velocity, if designated by u is given by  

Boyle et al (Ref 5, p 855) stated that direct measurements of particle velocity, density and pressure are not feasible at present and the indirect methods must be used. They describe a method using determination of the shock velocities in an explosive (such as Comp B) and in a Plexiglas plate placed in contact with the explosive [See under Detonation (and Explosion), Pressure of ] 

In the discussion which followed the presentation of Boyle et al paper (Ref 5), 

Dremin of Institute of Chemical Physics, Moscow, stated that Zavoyskii suggested a direct magnetic method for measurement of particle velocity behind the shock front in the transition region. A metal foil (ca 0.03 mm in thickness) is placed in the explosive to test and the charge is then placed in the magnetic field. 

On detonation of charge the foil moves behind the shock front with particle velocity, and the potential on its end is recorded on an oscilloscope. It is claimed that this method has a better precision than the shock-impedance method  

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