Laboratory Equipment -

Suggestions about what equipment you might consider buying and a list of my own equipment.

Test Coils Description -

These are the coils which are used for the majority of the basic experimental work.

Test Coils Data -

This gives the parameters of the test coils.

Test Projectiles -

A range of projectile types have been produced for general experimental work. This details the projectile parameters.

Experimental Energy Sources -

No, not new types of energy sources, just the specific details of the systems I'm using.



Experimental Rig -

The experimental rig is where most of the coilgun testing is conducted. At the moment it consists of a base platform with coil mounting flanges, a raised module platform.

Optical Speed Trap -

This system allows the velocity of the projectile to be determined to a high degree of accuracy.

Current Sensor Module -

This is a simple module which can be inserted in the current path to make measurements.

Experimental Measurements -

A basic introduction to measuring the various different parameters during a firing sequence.


Triggering and Switching Systems:

Open Loop Pulse Trigger Module -

Based on the 555 timer chip, this module can produce any pulse width between 100us and 100ms.

Optical Trigger Module -

This details a basic optical triggering device which is suitable for velocities up to 50m/s.

Power MOSFET Module -

A self contained module with screw terminals is described. This is the switching device used for all of the low power experimental work.

MOSFET Switching Issues -

Looks into the potential problems of switching MOSFET devices.

Switching Transient Suppression -

This experiment takes a brief look at the overshoot and ringing which occur when the current is switched off in a coil circuit.

Induced Voltage Trigger -

An induced voltage trigger for use with single stage coilguns is developed.

Multi-stage Induced Voltage Trigger -

Several trigger stages are combined to provide a cascading trigger system.


Coilgun Performance:

Open Loop Pulse Triggering -

This triggering method is used to investigate how critical the current timing needs to be.

Optical Triggering -

Triggering with an optical gate is a highly reliable method. These experiments look at how this triggering method compares to the best open loop results.

Induced Voltage Triggering -

Sensing of the dynamic flux linkage can be used to determine the projectile's position in the coil. This method is investigated for both battery and capacitor voltage sources.

Diode Commutation Modification -

The rate of current decay in a coil can have a significant effect on the resulting muzzle speed. These experiments look at a 'constant voltage' decay in which several commutating diodes are connected in series.

Launch Position Effect -

The launch position is shown to have a large effect on the resulting velocity and efficiency.

Thyristor Fired Coilgun -

A simple thyristor fired coilgun is examined.

Enhanced Flux Linkage -

A powdered-iron shell flux path is used to improve the efficiency of a single stage coilgun.


Last Modified: 10 Jan 2005