Optical fiber intrusion detection
fence sensor
This is an Intrusion detection fence sensor
More accurate detection
More reliable detection
Simpler installation
Wider detection coverage
Better immunity from thunder
6
7
8
More flexible layouts
Easier deployment
Operating principles and functions
accurate detection
1 More
(High repeatability of detection, fewer false alarms)
When equivalent vibrations are applied to the high-sensitivity PMF, the waveforms obtained are
nearly identical, which helps set accurate threshold values.
Alarm thresholds can be precisely programmed.
Example
Fence sensor unit
(HIDS-2)
Terminal box
Outdoor Protective box
Optical sensor cable
Terminal box
using optical fiber.
Optical
Optical fiber
fiber intrusion
intrusion detection
detection fence
fence sensor
sensor
Intruder detection
Intruder
detection for
for important
important facilities,
facilities,
plants
plants and
and laboratories
laboratories
Spectrum
Spectrum evaluation
evaluation enables
enables the
the reduction
reduction of
of false
false alarms
alarms by
by removing
removing spectral
spectral
components
components of
of environmental
environmental factors
factors such
such as
as winds.
winds.
Alarms
Intruder
Intruder
Unaffected
Unaffected by
by
the
the wind
wind
Strong
Strong wind
wind
Frequency
Frequency
High
High
Low
Low
Time
Time
Spectrum intensity
Climbing
Climbing on
on the
the fence
fence at
at strong
strong wind
wind
Time
Time
Spectrum
Spectrum intensity
intensity distributions
distributions of
of fence
fence vibrations
vibrations
33
reliable detection
2 More
(Less environmental influence)
Unaffected by dust because there is no use of free space optics.
Unaffected by snowfall and fog
Simpler installation
(Sets up easily even for complex perimeters)
No need to set up mechanical devices such
as tension control structure and pulleys
No need to divide monitoring sections along
the corner of fences
Unaffected by excretion of
birds and suchlike
Unaffected by
dry leaves
Unaffected by
snowfall
Unaffected by
fog
Detect vibration with the upper
and lower 1.5 meters each
Unaffected by
waste paper
detection coverage
4 Wider
(Makes it possible to set up two-dimensional monitoring regions)
Fence vibrations detected up to approx. 1.5m above and below sensor (for chain-link fences).
Optical fiber intrusion detection fence sensor
immunity from thunder
5 Better
(Optical fiber cable is unaffected by Electromagnetic interference)
Optical sensor cable is unaffected by inductive lightning
Optical sensor cable doesnt generate Electromagnetic noise.
OK
Unaffected by
inductive lightning
Install an optical
sensor cable only
Relay/
Terminal box
Additional fences
flexible layouts
6 More
(Supports changes and expansions to layout)
Make it possible to increase monitoring section using expansion sensor cable and Relay/Terminal
box.
7 Easier deployment
Easy installation using cable ties. (No need to fix cable to fence closely)
Installation
Fixing method
- Sensor unit
: Put in an outdoor Protective box
- Terminal box
: Fix in a fence post using stainless bands.
- Optical sensor cable : Fix in fences without a slack at intervals of 25 cm or less.
Detail drawing of optical sensor
cable installation
Intervals 25 cm or less
Terminal box
Fence post
Optical sensor cable Outdoor Protective box
(IP55 is recommended)
Fence
Max. 300m ( 100 m is recommended)
Max. 300m
A short cable length is recommended when
Power source
Signal
To a secure control room
the magnitude of fence vibration between
posts is uneven
Cable tie
8 Operating principles and functions
The intrusion detection fence sensor uses the principle of a Sagnac interferometer.
When the vibration of the sensor cable stretches and contracts the PMF, light propagating in
clockwise (CW) and counterclockwise (CCW) directions in the closed interferometer arrive at a
vibrating point at different times. This produces a phase difference that can be detected.
A microcomputer is used for the signal processing, and it can process a fast arithmetic
processing of the vibration intensity. It can output the data with a relay contact and LAN.
Light source
Optical fiber coupler
Optical sensor cable
CW
Polarizer
Photo detector
Phase modulator
CCW
Terminal box
Signal processing circuit
Failure
Tamper open
Ethernet
RELAY
Caution
COM
LAN
Warning
RS232C
Relay contact output
Ethernet is registered trademark of Fuji Xerox Co., Ltd.
Configuration of fence sensor
6
Optical fiber intrusion detection fence sensor
Specifications
1.Fence sensor unit
Type
HIDS = 1 : Single channel use, = 2 : Two channels use
(Hitachi metals Intrusion Detection Sensor)
Detection condition
Climbing on the fence
Output signal
Caution, Warning, Trouble, and Tampered
Changeable settings
Evaluation value, Signal amplication
Measurement distance
Max. 300m (100 m is recommended)
Operating temperature
30 to +70 [degC]
Operating humidity range
0 to +95 [%RH] (Non condensation)
Supply voltage
DC +12 V or DC +24 V
External dimensions
14019070 mm
Weight
Below 2 kg (Excluding optical sensor cable
2. Optical sensor cable
Type
Optical sensor cable with an end box
C PMF M = Cable length
Optical sensor cable with both ended SC connector
W PMF M : 50m,100m,200m
Maximum distance of connected cable is 300m.
Maximum connecting point is one point.
Cable diameter
4mm
Optical ber
Polarization maintaining ber
Cable sheath
Polyethylene (Gray)
Allowable bending radius
R130mm
Allowable pulling tension
150N
Waterproof, Dustproof
IP55 (Terminal box only)
Reinforcement ber
Aramid bers
Tension member
FRP 0.4mm1
Cable weight
11g/m
Bobbin size
430340mm
3. Relay/Terminal box
Type
CB-10 (Connector Box)
External dimensions
15045230 mm
Ingress Protection code 5 JIS C 0920
Weight
About 1.5kg
Hitachi Metals, Ltd.
http://www.hitachi-metals.co.jp/e/
Cable Materials Company
Shinagawa Season Terrace, 2-70, Konan 1-chome, Minato-ku, Tokyo 108-8224, Japan
Tel : +81-3-6774-3730
Hitachi Cable America Inc.
Head Office
2 Manhattanville Road, Suite 301, Purchase, NY 10577, U.S.A.
Tel : +1-914-694-9200
Specications subject to change without notice.
CAT.NO.KSE622A
All rights reserved
Printed in Japan
16-4
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