Distributed Temperature Sensor - Capabilities. Hans Meulman Business Development Manager Optical Fiber Sensing Solutions Yokogawa Europe
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1 Distributed Temperature Sensor - Capabilities Hans Meulman Business Development Manager Optical Fiber Sensing Solutions Yokogawa Europe
2 DTS Basics Backscattered
3 Introduction DTS technology The fiber optic Distributed Temperature Sensing (DTS) method using the Raman-effect has been developed at Southampton University in England, UK in the early 80 s. The DTS method is based on Optical Time-Domain Reflectometer (OTDR) technology and uses a technique derived from telecommunication cable testing. The fiber optic-based DTS method measures temperature using optical fiber instead of thermocouples or thermistors
4 Distributed Temperature Sensor (DTS) Principle Measurement Distributed Measurement - 1m spatial resolution Measurement of 50 km Optical fiber = 50,000 sensors! Backscattered light provides temperature at every 1m Standard multi-mode optical fiber DTS Instrument (interrogator) T 1 T 2 T 3 T 4.
5 Distributed Temperature Sensor (DTS) Principle Spectrum Light is backscattered from natural anomalies within the fiber This happens at all points within the fiber Range gating allows specific sections along the fiber s length to be examined laser pulse laser detection Backscattered light Scattered light spectrum Optical fiber Raman Anti-Stokes Raman Stokes Temperature dependent Frequency shift
6 DTS Measurement Principle Principle Spectrum annotation by SensorTran
7 DTS Applications
8 Applications: Downhole Applications Temperature Monitor (Steam Chest formation, Breakthrough) Flow Monitor (Joule-Thomson Effect) (Oil or Gas Flow at each Zone) Borehole Heel Steam Oil
9 Applications: LNG LNG Terminals Gas Tank LNG Tank Vaporizer Governor LNG Tanker Offloading Pipe Initial Cool Down Monitoring and Pipe Leak Detection Leak Detection Preventing Gas Leak Reducing Start Up time Preventing Gas Leak Bottom of Tank Temperature Monitoring Preventing Ground Freezing
10 Applications: LNG Tank leak detection DTS can identify small leakage Outer Tank Inner Tank Optical Fiber Cable Detecting the leakage 10
11 Applications: Monitoring power lines Monitoring of power transmission line temperature To check abnormal hot-spot (ground fault, insulation breakdown etc.) To predict temperature of conductor from cable temperature and current. Overheating of cable s maximum operating temperature
12 Applications: Pipeline Leak Detection Quick detection of small leakage events and monitoring of the pipeline temperature profile. Pipelines such as LNG, LPG, ammonia, ethylene create cold zones which can be easily detected when leaks occur.
13 Applications: Hot Spot Monitoring Customer benefits No Blank Area: Only one optic fiber can monitor temperature for wide area Prompt Action: Heated Location Detection in short time (<10sec/Channel) Full overview: With the optical fibre you can monitor a big area. Give warning what avoid damage on the installation
14 Applications: Fire detection in Conveyor systems Application Detection of heat build-up/fire along industrial conveyor systems prior to fire outbreak (woodchips) DTS detects abnormal temperature at every point of the conveyer. 1 2 Belts 2 3 Rollers 3 4 Optical Sensor Cables
15 Applications: Fire Detection for Cable rack system Application Detection of heat build-up/fire in cable tray or rack system Customer benefits No Dead spot: Only one optic fiber can monitor temperature along the cables. Monitoring Wide Area: Multi Channel Monitoring by using Optical Switch Prompt Action: Heated Location Detection in short time (<10sec/Ch.)
16 Applications.. Much more: Industrial Facilities Tunnels Structures & Buildings Environments Monitoring Dams Dykes, Waterways and Harbours
17 Fiber optical cable
18 Advantage of the Optical Fiber Cable Fiber Cable The sensor Immunity to electromagnetic interference (EMI) and electrical discharge (lightning) Passive operation, intrinsically safe. Water and corrosion resistant Excellent resolution and range Rugged, small size and light weight Absolute measurement Low signal loss, sensors may be interrogated for many kilometres Signal conditioning equipment has much smaller foot print
19 DTSX Unit
20 DTSX Modules
21 DTSX Performance Performance Specifications Spatial Resolution: 1m Sampling Interval: 10cm, 20cm, 50cm, 1m Temperature resolution: 0.2 (3km, 10min) (DTSX200) Temperature resolution: 0.03 (10Km, 10min ) (DTSX3000) Non-Volatile on-board Memory data storgae (100 traces) Low Power Consumpotion (full operating Range) Operation 10W, Standy-by 2W (DTSX200) Operation 16W, Standy-by 2W (DTSX3000)
22 DTSX Lineup Compact Industrial Design 19 inch compact rack design Industrial design -40 to +65 C (2 & 4 ch) Humidity 20-80% RH. Non-condensing Low weight and footprint (weight 2,5 kg) Approvals Compliance ATEX Type n CSA Type n FM : Class I, Div 2, Gps A, B, C, D T4 CSA : Class I, Div 2, Gps A, B, C, D T4
23 DTSX Modular design Alarm Management Integrated High, Low, Rise, Fall & Difference Alarm Section Full Alarm management Module inside 30 alarm section to define Combination of differed alarm types Alarms available in Process environment Fully Integrated in DTSX
24 Integrate Programmable Logic Controller Openness Integrated PLC STARDOM PLC: Programmable Logic Controller Control with programmable logic Simple or Sequential Process Interface with DTSX (Tempurature data & alarm data) Embedded I/O Temperature Info Pressure, flow, temperature relay, buttons indicators.
25 Conclusion
26 Advantage of DTS When there are a large number of sensors to be placed A single optical fiber can replace many point sensors When there is no a priori knowledge of sensor placement Not always possible to determine the correct location/position for temperature sensor When electrical temperature monitoring is impractical Situation where there is a large amount of electromagnetic noise When electrical temperature monitoring is unsafe fiber optic does not present a spark hazard can be a significant safety advantage.
27 Advantage of DTS DTS systems represent a cost-effective method for obtaining thousands of accurate, high-resolution temperature measurements. DTS technology offers a safe and non-intrusive measurement with has the capability to pinpoint the precise location of any warm or cold spot instantly.
28 Thank you for your attention
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