Distributed optical fiber temperature measurement system dts-bly-5s

Distributed optical fiber temperature measurement system dts-bly-5s
1： System introduction
Distributed optical fiber temperature measurement system dts-bly-5s is a continuously distributed optical fiber temperature sensing system (DTS)
It uses advanced OTDR technology and the temperature sensitive characteristics of Raman scattered light to detect the temperature changes at different positions along the optical fiber and realize the truly distributed measurement
Linear optical fiber differential constant temperature fire detector can not only timely warn the potential fire hazards, but also accurately locate the fire location
As a mature distributed temperature measurement method, linear optical fiber differential constant temperature fire detector has the advantages of long measurement distance, high measurement accuracy, fast response speed, anti electromagnetic interference and suitable for dangerous places such as combustion and explosion
It can be widely used in high-voltage cable on-line monitoring, power current carrying capacity analysis, traffic tunnel fire monitoring, oil and gas storage tank fire monitoring, coal conveying belt fire monitoring Dam leakage monitoring and other fields

2： Measuring principle
The temperature measurement of distributed optical fiber temperature measurement system dts-bly-5s is based on spontaneous Raman scattering effect
The laser pulse width of LD (Stokes), Stokes (Stokes) and Stokes (Stokes) are extremely narrow, and the laser pulse width of LD (Stokes) and Stokes (Stokes) are very weak, respectively; Among them, anti Stokes is temperature sensitive and signal light; Stokes is temperature insensitive and is the reference light
The signal light backscattered from the sensing fiber passes through the beam splitting module WF again to isolate the Rayleigh scattered light, passes through the temperature sensitive anti Stokes signal light and the temperature insensitive Stokes reference light, and is received by the same detector (APD)
The temperature can be calculated according to the light intensity ratio of the two
The position determination is based on OTDR technology
The position of the optical fiber corresponding to the scattering signal can be determined by measuring the echo time of the scattering signal with high-speed data acquisition

3： System features and functions
Distributed optical fiber temperature measurement system dts-bly-5s has the following technical advantages:
1: Rapidity
The temperature measurement and positioning speed of the system is very high
In order to improve the measurement time, the advantages of high-speed weak signal processing technology are adopted
The single measurement time is 3 s and the response speed is fast

2: Distribution characteristics
The distributed optical fiber temperature measurement system can provide continuous and dynamic monitoring of temperature change signals at every 0
5m within a range of more than ten kilometers, and can set temperature alarm values at all levels arbitrarily

3: Advanced Nature
The system is a distributed temperature measurement product with high performance index, strong functionality, high reliability and advanced technology
The key components are selected from foreign imported performance components, and the core algorithm has been strictly tested

4: Accuracy
The typical temperature resolution of the system is 0
5 ℃, the temperature accuracy is 1 ℃, and the spatial resolution is up to 0
5m

5: Flexibility
The system adopts real-time online monitoring mode; The time for the alarm signal at any point within the monitoring range to be uploaded to the fire alarm controller shall not be greater than 30 seconds; The monitoring system provides a continuous dynamic monitoring signal
The system can set multi-level temperature point alarm, that is, the system supports multi-level alarm, such as 30 ℃ initial alarm, 40 ℃ pre alarm, 50 ℃ measures, etc
, and the temperature parameters of alarm points can be set according to different environments; It has a variety of differential and constant temperature alarms, and the alarm parameters can be set in different zones according to customer requirements, which makes the alarm flexible

6: Compatibility
The system host is an open communication protocol, which provides a communication interface connected with the workstation
The disaster prevention alarm workstation in the central control room displays all information such as temperature curve, alarm position and alarm temperature in Chinese graphic form; The system can be linked with PC, fire alarm system and other control equipment through RS232, RS485, built-in relay, RJ45 or other industrial protocols to give audible and visual alarm, and the signal output is accurate and complete

7: Security
The optical cable distributed temperature monitoring system has the function of safety record, which can store historical data within one year and can be effectively audited
Single end operation, remote diagnosis, low limit system remote diagnosis can be provided by special engineers through LAN; If the optical fiber is damaged, the DTS system can immediately locate the damaged point and weld it through the optical fiber welding machine without stopping the measurement, which is very important for the effective implementation of on-line monitoring; The detection optical cable is inherently safe and adopts optical signal, which will not produce mutual electromagnetic interference with the power cable