The Secretary of State for Defence in Her Britannic Majesty's Government

Oxford Lasers Limited

Anthony John Andrews

Andrew J Kearsley

Gideon John Foster-Turner

Graham Rutterford

Martyn Richard Huw Knowles

Keith H Errey

Andrew Ian Bell

Colin E Webb

A method of laser-drilling a hole through a workpiece, such as an injector nozzle ( ), into a cavity comprising drilling a hole ( ) through the workpiece ( ) with a laser ( ), providing a fluid having laser-barrier properties in the cavity so that, when the hole ( ) is open to the cavity, laserlight passing through the hole ( ) is incident upon the fluid whereby the workpiece ( ) across the cavity from the hole ( ) is protected from the laserlight, and arranging that the fluid does not enter the laser-drillled hole ( ) during the drilling process. Apparatus for performing the method is also described.

Laser-drilling

A condenser including a condenser chamber having an extension portion extending through the base of a refrigerant storage vessel. The length of the conduction path along this portion is variable. This may be performed by partial retraction of the extension from the vessel, or by inclusion of one or more insulating shields. Both extension and shield may be threaded. The vessel may be of thin stainless steel or compliant solid insulating material, allowing fine adjustment of the conductive path length by tightening of the shield against the base of the vessel. The internal surface of the chamber may be undulated, in particular by threading, to promote turbulent flow and mixing within the chamber. The extension may be recessed and joined to a filling tube, to facilitate initial cool down. The complete condenser is encased by expanded polyurethane foam inside a box.

Condensers

Growing community of inventors

Oxford, United Kingdom

Anthony John Andrews