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Fiber Optic Distributed Temperature Sensing
Introduction
Temperature monitoring technology’s future has arrived due to the advent of Optical Fiber Distributed Temperature Sensors (OF-DTSs). A Fiber Optic Distributed Temperature Sensor (DTS) can measure an entire length of the fiber optic cable continuously as opposed to only at specific points like with traditional point sensors. The Optical Fiber Distributed Temperature Sensor system, which is produced by Tempsens, works on principles of Raman light scattering and then employs Optical Time Domain Reflectometry (OTDR) to measure over distances in kilometers range, giving users thousands of temperature readings. This technology provides customers with immediate feedback, high spatial resolution, as well as sampling resolution. These characteristics make it an ideal monitoring tool in an industrial setting for companies that wish to use continuous monitoring to monitor products or processes. The system provides accurate temperature readings using standard cables, with high accuracy and reliability.
About Fiber Optic Distributed Temperature Sensing
Working Principle of Raman Optical Fiber Distributed Temperature Sensor
Raman based optical fiber distributed temperature sensor operate on a Raman Backscattering Principle. The main principle is that when a laser is introduced into an optical fiber, there will be scattering of the light by glass molecules in the fiber. Most of this scattered light will have the same wavelength as the incoming laser (this is called Rayleigh scattering), but some of the scattered light will have wavelengths that are different from the original laser (this is called Raman scattering). The remaining energy in these different wavelength signals is referred to as Stokes and anti-Stokes signals. The ratio of the intensity of the anti-Stokes and Stokes signals provides an accurate measure of the temperature at any location in the fiber. Using the time of flight method with Optical Time Domain Reflectometry (OTDR), the exact location of the temperature measurement can be accurately determined.
Video – https://www.youtube.com/watch?v=OMotD1ezMSY
Application Of Raman Optical Fiber Distributed Temperature Sensor
- Temperature is measured along the length of a pipeline and allows for detection of leaks in a pipeline of oil and gas.
- The detection of early-stage fires within tunnels, subways, and critical response locations
- Measurement of temperature of transformer skin, and monitoring of power lines during transmission
- Monitoring the temperature of conveyor belts and the outer surfaces (metals) of reaction vessels (reactors)
- Process temperature monitoring in potentially hazardous locations.
Specification Of Raman Optical Fiber Distributed Temperature Sensor
| Channel Number | Upto 20 |
| Sensing Length | Upto 20km |
| Fiber Connector | E2000/APC |
| Spatial Resolution | 0.5m , 1m , 2m |
| Location Accuracy | 0.5m |
| Temperature Accuracy | ±1°C |
| Temperature Resolution | 0.1°C |
| Sensing Range | -40°C ~ 200°C (depends on fiber cable capability) |
| Response Time | 5 sec /channel |
| Communication Interface | RJ45, RS232/RS485 |
| Protocol | MODBUS |
| Outputs | RS485 (Modbus), RJ45(Modbus TCP) |
| Power | 220 V AC, 50-60 Hz |
Why Choose Tempsens?
- Decades of hands-on expertise delivering reliable thermal solutions.
- Full manufacturing control, from raw material to finished product, backed by state-of-the-art facilities.
- Dedicated technical support team providing assistance throughout the entire purchase and commissioning process.
- Worldwide service network providing timely post-sale product support and maintenance of your systems.
FAQ
Frequently Asked Questions
Find answers to frequently asked questions related to Fiber Optic Distributed Temperature Sensing.
Distributed temperature sensors utilize a single piece of optical fiber to provide continuous temperature readings over the total length of the fiber and can be read at thousands of locations at once; in contrast, RTDs and thermocouples only measure temperature at a limited number of separate points. Using a single fiber-based distributed temperature sensor allows for superior area coverage without the need to install multiple sensors. Distributed temperature sensors also require less cabling to connect to an end device and provide safe operation in potentially explosive environments since there are no electrical components located in the sensing area.
The Tempsens DTSenz Distributed Temperature sensing system has a temperature range that is standard from -20°C to +120°C, with specialized cables capable of operating outside of this range as well. The accuracy of the system is ±2°C over the maximum 16 km sensing distance, with a measurement time of 5 seconds. The temperature resolution is 0.1°C, which allows for low thermal deviation. Additionally, the position accuracy of ±0.5 meter provides for a precise location of any temperature variations along the monitored asset.
