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Perimeter security glossary - L

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L

SD-STD-02.01 Revision A U.S. Department of State Designation crash test rating that indicates maximum allowed penetration of the barrier by the vehicle.

L1

SD-STD-02.01 Revision A U.S. Department of State Crash Test rating indicating a barrier with this rating can withstand a 15,000-pound vehicle crashing perpendicularly into the barrier with 20 feet to 50 feet of penetration (6.1 meters to 15.3 meters). Typically the L ratings are combined with one of the K speed ratings.

L2

SD-STD-02.01 Revision A U.S. Department of State Crash Test rating indicating a barrier with this rating can withstand a 15,000-pound vehicle crashing perpendicularly into the barrier with 3 feet to 20 feet of penetration (.915 meters to 6.1 meters). Typically the L ratings are combined with one of the K speed ratings.

L3

SD-STD-02.01Revision A U.S. Department of State Crash Test rating indicating a barrier with this rating can withstand a 15,000 pound vehicle crashing perpendicularly into the barrier with 3 feet or less penetration (.915 meters or less). Typically the L ratings are combined with one of the K speed ratings.

Laminated Glass

Multiple sheets of glass bonded together by a bonding interlayer.

Laminated Glazing

Glass or glass/polycarbonate combinations bound together with an interlayer material such as Plasticized Polyvinyl Butyral (PVB) to form a cross-or forced entry.

Landscaping

The use of plantings (shrubs and trees), with or without landforms and/or large boulders, to act as a perimeter barrier against defined threats.

Landscaping Countermeasures

Use of shrubs and trees, with or without landforms section that is resistant to explosive blast, ballistics and/or large boulders, to act as a perimeter barrier against defined threats. See Explosion, Perimeter.

Laser Intrusion Detector

A sensor that activates upon detection of a break in a beam generated by a low-power laser.

Layered Security

A physical security approach that requires a criminal to penetrate or overcome a series of security layers before reaching the target. The layers might be perimeter barriers; building or area protection with locks, CCTV and guards; and point and trap protection using safes, vaults, and sensors. See Perimeter.

Layers of Protection

A traditional approach in security engineering using concentric circles extending out from an area to be protected as demarcation points for different security strategies.

Level of Protection

The degree to which an asset (person, equipment, object, etc.) is protected against injury or damage from an attack.

Light Bulb Bomb

An incendiary device made by drilling a small hole in a light bulb and filling it with a highly combustible material. The light bulb is placed in a socket. When the light switch is activated, the electrical arc in the bulb will ignite the combustible. See Bomb.

Light Machine Gun (LMG)

A machine gun with a rifle caliber (most 5.65 mm). It is used as a light support weapon in infantry platoons and can be served by one soldier. See Heavy Machine Gun.

Lighting

The method or equipment for providing artificial illumination.

Limited Area

A restricted area within close proximity of a security interest. Uncontrolled movement may permit access to the item. Escorts and other internal restrictions may prevent access to the item. See Controlled Area and Exclusion Area.

Line-of-Sight

Unencumbered sight line between a potential firing point for standoff weapons and a potential target.

Line-of-Sight Sensor

A pair of devices used as an intrusion detection sensor that monitor any movement through the field between the sensors.

Logistics

The aspect of military operations that deals with the procurement, distribution, maintenance, and replacement of material and personnel.

Low Angle High Velocity Fragments

Term used to describe fragments generated by explosions moving at high speed and a low angle, moving laterally or along the level of the ground or surface. Earthen berms, earth filled protective barriers, or revetment structures can be effective in minimizing or neutralizing the impact of high velocity, low angle fragments although the structures might be sacrificed. See A1 Revetment, B1 Revetment, Expeditionary Earth Filled Protective Barriers, Revetment, Metalith.

Low-Order Detonation

An incomplete detonation of an explosive charge.

Low-Order Explosion

Characterized by a slow expansion over a relatively wide area into a combustion known as deflagration. See High Order Explosion.

Low-Order Explosive

An explosive with a velocity of detonation less than 1000 meters per second. It exerts a pushing effect, which propels objects as opposed to shattering them. Black powder and smokeless powder are low-order explosives. See Black Gunpowder, Explosive.

Lye Bomb

A non-exploding, homemade anti-personnel device consisting of a thin-glassed container filled with a liquid lye. It is designed to be thrown and to break upon impact, causing burns to the skin and eyes of the targeted persons. See Bomb.

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For more information about Infrastructure Defense Technologies' perimeter security products and applications, please call us at 1-800-621-5617, email us at info@themetalith.com, or fill out our contact form.

The Metalith
A Division of Infrastructure Defense Technologies
3575 Morreim Drive • Belvidere, Illinois 61008
Phone: 1-800-621-5617• Fax: 1-815-323-1317
Email: info@themetalith.com