Airlocks and access control

摘要

One aspect of access control that is little talked of is airlocks. The principle is generally well understood. In its simplest form, the airlock is composed of two doors that are electrically interlocked in such a way that the tworncannot be opened simultaneously. Airlocks are used in a variety of situations but in essence they are there to control the unwanted passage from one area to another. Airlocks may be used to control the entry of personnel to a secure area such as arncleanroom, where dust or small particles may be a problem. Similarly if a constant temperature must be maintained then an airlock can be invaluable in reducing temperature fluctuations when doors are opened.