[1] Governments use perimeter security not only for the safety of their citizens, but to control the flow of commerce and immigration, as well as to protect vital infrastructure from attackers.
From sharpened pikes in medieval times to more modern technological solutions, armed forces have always sought to prevent their enemies from breaching their front lines.
[3] In World War II, the German military developed concrete barriers called dragon's teeth to slow the approach of enemy tanks.
The mountains, rivers, oceans, deserts, canyons, and glaciers of the world have long provided a natural barrier to invasion and trade among competing groups.
Likewise, exploitation of Alaska's rich resources was greatly delayed while innovation lagged in breaking through the icy and oceanic perimeter.
Even with advanced technology, the lack of water and harsh temperatures make traversing and living in the world's deserts a journey for a relative few.
Still in heavy use today, this relatively cost effective perimeter is popular due to its transparency, strength, storage, and ease of installation.
With smaller, rapid deployment forces the norm for most of today's military engagements, large walls, high fences, and other permanent solutions aren’t always effective.
MEMS technology can be used to enhance the effectiveness of fences' protection by incorporating sensors that can detect changes in pressure, vibration, and other physical phenomena.
Beginning with the advent of electronic sensors, the concept of perimeter security evolved rapidly to include more modern, technological solutions.
Secure wireless communications, lightweight weaponry, faster transport, and portable perimeter protection have all become vital to the success of such missions.
These products include thermal cameras, compact radar, microwave and radio wave fences, and biometric scanning, most of which can be linked to smartphone or tablet technology.