TYPES AND WORKING PRINCIPLES

An electromagnetic velocity gauge is a thin film arrangement consisting in an single Cu foil strip that is connected to a pair of leads and sandwiched between two layers of a suitable insulator (Kapton). When properly mounted inside or at the surface of an insulator medium and submerged within a known magnetic field, a measurement of the voltage created at its output leads becomes a direct means to infer material velocity produced under the action of a shock wave. Of all the thin film sensors and other methods to measure shock wave parameters, the electromagnetic velocity gauge is the most direct and accurate and simplest to use.

Some important considerations for the application of this type of gauge include the following; 1) It is important to maintain a uniform and staedy magnetic field in the target area, 2) The minimum magnetic field strength should be approx. 2K Gauss, and 3) Target material should be of a non-conductive material (conductive material can distort and destroy the magnetic field. These sensors are commonly used in Dynasens Gas Gun Facility.

To down load a PDF version of this page click (here)

EMV5-5-EK & EMV5-10-EK

Our models EMV5-5-EK and EMV5-10-EK velocity gauges are made from 0.0005 Cu foil and 0.001 Kapton insulation. The lengths of the velocity elements (L_e) are 5 and 10 mm respectively. Please specify lead length upon ordering. Other specifications are also available. Consult our price lists.

Our velocity gauges are well calibrated.
.