FIBER OPTIC SENSING

High Temperature Monitoring

We are the experts and we help you be successful. 

Overview

We have developed the technology for our fiber optic cables to thrive in extreme temperatures, providing sensing solutions in even the harshest environments. No other sensing technology on the market can measure temperature distribution. Our breakthrough in High Temperature Fiber Optic Sensing (HT-FOS) has set new standards in the industry, offering better solutions for refractory materials beyond 500°C. 

Fiber optic sensors successfully monitor many measurement points in a single optical line to the utmost accuracy and dependability. The advantage to heavy industry is tangible. The industry depends on resilient and reliable equipment to function. 

Temperatures can exceed 500°C in power plants, refractories, and oil refineries. Sensors that perform in extreme temperatures allow for highly accurate and distributed temperature profiles to be mapped out in real-time and saved for further analysis and historical data comparison. 

Our fiber optic cables perform in extreme temperatures, but how we apply the technology is up to you. We have the know-how in almost every discipline, from the production of sensors (FIMT), measurement principles, lab testing equipment, and FO Installations. 

Come to us with your project, and we’ll respond with a bespoke solution that solves your challenge with maximum efficiency and performance. 

Applications

Why Fiber Optics

for High Temperature Monitoring

Avoid Accidents

Avoid accidents and interruptions by applying refractory material properly and evenly

Efficient in Application

Making the process of applying the refractory material faster and more efficient

Optimise process

Create a highly efficient production process with continuously adapted process parameters (HT Operators in general)

Avoid Damage

Blocking of Pipelines

….

Controlled maintenance

  • Monitored wear and tear
  • Life cycle management
  • Improved service planning

NBG Solutions

in High Temperature Monitoring

  • Optical Fibers
  • Production of FIMTs
  • High corrosion resistant materials (Alloy)
  • Tubes without pinholes

we need copy

  • Different Measurement principles (FBGs, Brillouin, Raman)
  • Preparation of Data for further Data Interpretation
  • Clamps and mounting/installation material
  • airtight connector boxes
  • upon special request only, talk to your solution manager first before committing to a customer
  • upon special request only, talk to your solution manager first before committing to a customer

Optional Services

Our Clinets

Temperature Monitoring

up to 350°C

Off-the-shelf cable solutions – text here –

Temperature Monitoring

from 350°C to 800+°C

At our R&D Facilities, we develop custom solutions to ensure every project receives the best approach. High temperature always requires innovation due to the particular challenges it brings. Electronic sensors need to be protected by materials that withstand high temperatures without causing other problems, such as decreased weight or flexibility. We support projects in Industry, Machinery, Furnace Monitoring, and Industrial Process Controlling, and each case receives custom research to find the solution it deserves. 

We believe our recent breakthrough has created a higher industry standard. No other sensing technology on the market measures temperature distribution. Conditions beyond 500°C have never had the opportunity to engage with High Temperature Fiber Optic Sensing (HT-FOS) of the efficiency and reliability that we can now offer. From the production of sensors (FIMT), measurement principles, lab testing equipment, and FO Installations, we have the know-how and the agile approach to overcome any challenge. 

Applications

we can support your project

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Cement Industry

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Ceramic Industry

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Chemical Industry

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Oil and Gas

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Glass Industry

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Metal Industry

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Renewable Energy

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High-Voltage Cables on power poles or buried underground:

Power grids must operate at the most efficient and reliable level possible. Our solution pushes the limits of efficiency in a power cable’s infrastructure without compromising safety. The cable is protected against external forces, such as the environment and theft, keeping it running uninterrupted at full power, 24/7. 

Pipeline Monitoring

One of the most important considerations with Pipeline Monitoring is the detection of leakages. Our fiber optic sensing solutions constantly relay accurate information in real-time, detect any leak immediately, and create efficient and safe environments. 

Downhole Temperature Profiling

Potential applications in Downhole Temperature Profiling include real-time fluid level measurement, multi-zone production pressure, and temperature monitoring. We offer custom solutions to every challenge in fiber optic sensing, getting the most efficient and reliable results in Downhole Temperature Profiling. 

Case Studies

High-Temperature Monitoring
(up to 600°C)

in Almería Power Plant

We delivered a solution to measure up to 600° C in Almería Power Plant. Our solution consists of an FBG interrogation unit and an FBG chain of 21 temperature sensing points inserted into a stainless-steel tube, protecting the fiber from a range of external influences in addition to temperature.

On the back of ground-breaking developments in R&D, we are the industry leaders in high-temperature monitoring. We approach every project with a custom mindset to give us the best chance of success, and this was an asset in the project at the Litoral de Almería power plant, where temperatures can exceed 600° C.

The Litoral de Almería power plant required high temperature monitoring for its coal-powered boiler furnace. The nominal temperature of the superheater is 541° C at a pressure of 173 bar but the temperature can surpass that and reach above 600° C, and standard fibers cannot withstand such temperatures. Our FIMT (Fiber in Metal Tube) enables the fibers to perform in such an environment. The stainless-steel tubes also protect the fibers from other external influences in addition to temperature.

It was essential that our solution accurately read the temperature of the furnace at specific intervals. By monitoring the temperature of the furnace, we enable it to maximize operational efficiency.

  • Using the correct fiber and FBG (Fiber Bragg Gratings) type to provide long-term stability and lifetime.
  • Annealing and calibration of the sensor to provide the highest accuracy.
  • Ensuring the FIMT is fixed in direct physical contact with the tubes to guarantee that only the tube temperature is measured and not the ambient temperature.
  • Correct design and material of the FIMT and EFL (excess fiber length) so that fiber overlength can compensate for thermal expansion and compression.
  • Our solution consists of an FBG interrogation unit and an FBG chain of 21 temperature sensing points which is inserted into a stainless-steel tube. The sensitive points of the sensor, which include the FBGs, are installed longitudinally to the heating tubes and fixed by clamps.
  • Only one sensor is used, which has economic benefits and makes the connection to the interrogation unit easier.
  • The measurement data is sent via Modbus protocol to the Scada system of the customer.
  • The sensor consists of several FBGs written into a single fiber.
  • Only femtosecond laser-written FBGs (FBG type II) have long-term stability at high temperatures.
  • A temperature change is detected through a wavelength shift of the reflected light of the FBG inside the optical fiber.
  • The sensor is calibrated and ready to use, including connectors.
  • The sensor system will be connected to the spectrometer-based interrogator.
  • The design of the sensing system is very compact and robust for industrial applications, and it is embedded into a stainless-steel tube made out of Alloy 625.

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from our Fiber Optic Sensing Specialists

Stefan Hörth

Fiber Optic Sensing Specialist.
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