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PSP Edits > Intrusion Detection > Flashcards

Intrusion Detection Flashcards

1
Q

What are classifications of intrusion sensors?

A

Passive or active,
Covert or visible,
Line-of-sight or terrain-following (exterior only),
Volumetric or line detection,
Application.

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2
Q

How do passive sensors work?

A

Passive sensors detect energy emitted by the object of interest or detect a target-caused changed in a natural field of energy. Both types use a receiver to collect energy emissions. May include those that detect vibration, heat, sound, or capacitance.

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3
Q

How do active sensors work?

A

Active sensors transmit energy and detect changes (caused by presence or motion) in the received energy. Typically contain both a transmitter and a receiver. Types include microwave, infrared, and other RF devices.

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4
Q

To work well, these sensors require a clear line of sight in the detection space between both the transmitter and receiver and to use such sensors where the terrain is not flat requires extensive site preparation.

A

Line of sight sensors

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5
Q

This type of sensor detects equally well on flat and irregular terrain. Transducer elements and a radiated field follow the terrain, creating uniform detection through the zone.

A

Terrain Following

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6
Q

This type of sensor generates an alarm when an intruder enters the detection volume.

A

Volumetric Sensor

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7
Q

This type of sensor detects motion along a line or when an intruder violates a particular entry point into a detection zone.

A

Line detection

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8
Q

3 types of Exterior Intrusion Sensor application

A

Buried line, fence associated, freestanding

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9
Q

Exterior Sensor that is active, covert, terrain-following, buried underground, and respond to the motion of material with a high dielectric constant or high conductivity, such as human bodies and metal vehicles.

A

Ported Coaxial Cable

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10
Q

Exterior Sensor that is passive, visible, terrain-following, usually installed on chain link fences, that can detect motion or shock.

A

Fence Disturbance Sensor

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11
Q

Exterior Sensor that is passive, visible, terrain-following, forming the fence out of transducer elements themselves Designed to detect climbing or cutting the fence.

A

Sensor Fences

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12
Q

Exterior Sensor that is active, visible, terrain-following design to detect a change in capacitive coupling among a set of wires attached to, but electrically isolated from, a fence.

A

Electric field or Capacitance

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13
Q

Exterior sensor that is active, visible, line of sight, freestanding, designed to transmit an IR beam collected in a lens that, if blocked by an opaque object, detects the reduction in IR energy.

A

Freestanding Infrared

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14
Q

Exterior sensor that is active, visible, line of sight, and freestanding, using 2 microwave antennas installed at opposite ends of the detection zone and responds to changes within the detection field (called the vector sum).

A

Bistatic Microwave Sensors

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15
Q

Exterior sensor designed for detection in a large outdoor, unobstructed open area, suitable for night time use and where rain and fog are a concern. It is considered volumetric as a result.

A

GBR (Ground Based Radar-Radio. Detection. And. Ranging.)

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16
Q

Exterior sensor that is passive, covert, line of sight, and produces video signals from the video surveillance system.

A

Video Motion Detectors

17
Q

Examples of Buried Line Application

A

Ported Coaxial Cables

18
Q

Examples of Fence Associated Application

A

Fence Disturbance Sensors, Sensor Fences, Fiber Fences, Electric Field or Capacitance

19
Q

Examples of Freestanding Application

A

Freestanding Infrared Sensors, Bistatic Microwave Sensors, Ground Based Radar (GBR), (Light Imaging, Detection, and Ranging) LiDAR, VMDs (Video Motion Detection)

20
Q

Where does a perimeter intrusion detection system perform the best?

A

In an isolated clear zone, usually used at high security facilities.

21
Q

Examples of volumetric sensors?

A

Ultrasonic, microwave, passive infrared

22
Q

Examples of interior sensor application?

A

Boundary-penetration sensors, Interior Motion, & Proximity Sensors

23
Q

4 basic types of detection for interior motion detection

A

Trap detection-narrow or wide detection for high traffic areas or expected travel paths of an intruder to get from Point A to Point B.
Spot detection-detection on a particular object or high value area.
Channel detection-narrow detection in an area where an intruder is expected to cross.
Volumetric detection-wide or broad detection in a defined area.

24
Q

Interior application group most commonly include vibration & electromechanical technologies. Vibration sensors are passive line sensors that can be visible or covert (examples include glassbreaks). EM sensors are passive, visible line sensors (includes simple switches or door/window contacts).

A

Boundary Penetration Sensors

25
Q

Interior sensor application most commonly include monostatic microwave sensors and PIRs (passive infrared). Monostatic microwave sensors are active, visible, & volumetric. PIRs are visible and volumetric.

A

Interior Motions Sensors

26
Q

Advantages of Monostatic Microwave Sensors

A

Invisible & inaudible detection pattern
Relaibility and low maintenance
Low cost for area of coverage
High PD
Immunity to high air turbulence, temperature, & humidity changes
Availability of a variety of detection patterns

27
Q

Disadvantages of Monostatic Microwave Sensors

A

Requirement for completely rigid mounting
Susceptibility to pattern drift
Tendency to reflect off metallic objects
Need for special consideration in areas with light construction (e.g. glass, plaster, board, wood)

28
Q

4 major characteristics of IR Radiation

A

All objects emit it in proportion to their temperature
It is transmitted without physical contact between the emitting and receiving surfaces
It warms the receiving surface and can be detected by any device capable of sensing a change in temperature
It is invisible to the human eye

29
Q

Advantages of PIRs

A

Totally passive tech
Well defined detection zones
No interaction between multiple devices
Low to moderate cost
Relatively few nuisance alarms

30
Q

Disadvantages of PIRs

A

Moderate vibration sensitivity
Sensitivity variation due to room temperature
Line of sight operation with easily blocked field of view
Potential nuisance alarms from rapid temperature changes

31
Q

This type of sensor is active & passive, visible & volumetric. They attempt to achieve absolute alarm confirmation while maintaining a high probability of detection.

A

Dual Tech Sensors (most often combine a microwave sensor and a passive IR)

32
Q

What are the technical components of the IDS?

A

Sensors, control panel, circuit or sending device, annunciator or sounding device

PSP Edits (3 decks)

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