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principle of operation

When the optical cable sensor is affected by external vibration, some characteristics of the transmitted light in the optical cable will change. By configuring special sensing equipment and collecting and analyzing signals, the changes of light characteristics (i.e. attenuation, phase, wavelength, polarization, mode field distribution and propagation time) can be detected. Through the special algorithm and analysis of the alarm controller, the change of light characteristics can distinguish the intrusion behavior of the third party from the normal interference, and realize the alarm and positioning functions. This system is mainly based on the principle of "fiber optic interferometer". In order to detect weak vibration, a balanced fiber interferometer is composed of two single-mode optical cables. When a coherent laser emits a beam of laser light to it, the interferometer composed of these two optical cables outputs interference light signals. When the optical cables are disturbed by the outside world, such as digging, touching, knocking, etc., the output waveform of the interference light changes, and an interference image is generated. This waveform change can be detected by a photodetector, and the real situation of the incident can be identified by analyzing the characteristics of the changed waveform by software, thus achieving the goal of ".

Function introduction

High stability: the optical cable has low loss and high stability during transmission.

Passive detection: The vibration sensing optical cable is passive detection and non-conductive, which can effectively avoid lightning strikes.

Strong anti-interference: The vibration sensing optical cable adopts the passive detection principle, which can eliminate the interference of external strong electromagnetic field, effectively avoid the equipment damage caused by lightning, and has high system reliability.

High sensitivity: the detection sensitivity can be adjusted by multiple levels, and there is also a sensitivity adjustment software assistant. The real-time dynamics of light changes can be observed through the computer display screen, and false alarms can be effectively shielded.

Remote control: through computer control software, remote defense zone deployment and withdrawal can be realized.

The alarm output of normally open/normally closed dry contact corresponds to the alarm output, which can be used with a variety of modern security products.

Laying mode: Vibrating optical cable can be directly laid on various iron nets in S-type or straight-line type.

Sensing distance: the maximum sensing distance of each defense zone is 1000m.

Basic parameter

Optical cable signal collector

Number of zones: 8

Communication methods: network communication and on-off communication.

Debugging mode: debugging by local keys and PC software.

Optical fiber interface: FC/APC interface *10

Communication port: RJ45 100M network port *1, RS485 interface *1

Optical digital signal feedback interface: 1 set of 6-pin interface

Debugging interface: 1, 485 8-pin interface; 2. TCP/IP network interface; 3. Multi-band sensitivity micro setting switch

Frequency response range: 500Hz~100KHz

Alarm response time: ≤2S

Vibration coverage: 100%

Maximum detection distance: 1500m*40

Working status: online 24-hour real-time monitoring

Alarm sensitivity: 10m/s2, user adjustable.

Life of light source: more than 15 years

Maximum output optical power: 10W

Alarm signal output: Webservice communication protocol, switch signal

Interface: One-way sensing and communication integration technology: 16 cores, one in and one out; Unidirectional sensing communication separation technology: 12 cores, one in and one out, and 4 cores, one in and one out.

Operating wavelength: 1510—1590nm

Type of optical fiber SM, 9/125, 900μm

And power supply environment parameters

Power supply: AC 187 V ~ AC 275 V

Environment: temperature-40 ~+80℃; Humidity ≤95%

humanization design

Material: metal, standard rack type.

Protection level: IP45

Installation requirements

Length of defense zone: the length of a single defense zone is ≤ 1000m.

system composition