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Modern time delay combination locks can have many functions such as multiple different codes, pre-set time lock settings (open and close times), pre-set vacation times (e.g. Christmas Day), dual code facility, and a full audit trail providing a detailed record of the lock history showing who opened the lock, when and how long it was open.
deter potential intruders (e.g. warning signs, security lighting); detect intrusions, and identify, monitor and record intruders (e.g. security alarms, access control and CCTV systems); trigger appropriate incident responses (e.g. by security guards and police); delay or prevent hostile movements (e.g. door reinforcements, grilles);
M734 fuze cross section Amplifier (top) and oscillator. The M734 multi-option fuze [1] is a rangefinder and collision detection system used on 60 mm, 81 mm, and 120 mm mortar shells as a trigger to detonate the shells at the most damaging heights of burst when combating four types of battlefield threats:
A fence-mounted perimeter intrusion detection system installed on a chain link fence. A perimeter intrusion detection system (PIDS) is a device or sensor that detects the presence of an intruder attempting to breach the physical perimeter of a property, building, or other secured area.
An electronic countermeasure (ECM) is an electrical or electronic device designed to trick or deceive radar, sonar, or other detection systems, like infrared (IR) or lasers. It may be used both offensively and defensively to deny targeting information to an enemy.
[1] [2] It is believed that a "strong, visible defense will deter or delay an attack". [ 3 ] In terms of business and home security , target hardening [ 4 ] is one of the suite of protective measures that are included in crime prevention through environmental design . [ 5 ]
The remaining trip-lines may be hindered due to their proximity to the resting surface. After an additional 10-second electronic time delay, allowing the munition to return to equilibrium, the mine is fully armed electronically. Disturbance of a trip-line, or the mine itself, now triggers a switch which completes an electronic firing circuit.
The Rhino Passive Infrared Defeat System (also known simply as Rhino) was an early detonation Counter-IED system. It was mounted to the front of a vehicle and used heat to prematurely detonate any hidden improvised explosive devices (IEDs) while the vehicle was at a safe distance away from the blast.