Optical Fiber Temperature Sensing Solutions

High Accuracy Fiber Optic Temperature Sensor Solutions to Improve Your Process Applications

Distributed Temperature Sensors: DTSX Series

Yokogawa’s DTSX product family is engineered with a variety of fiber optic sensing cables that provide continuous temperature sensing for long distances. Our solutions provide enhanced visibility into your process, allowing you to detect problems before major catastrophic events occur.

Traditional temperature measurement such as point measurements or IR cameras may not provide the same level of coverage as that of a continuous optical fiber solution. Operators need to efficiently and effectively measure and alarm process leaks, hot spots, cold spots, and fire detection in real time over various lengths. Being able to identify these events within a timely fashion, indicate their specific location, and then be able to resolve these events immediately is paramount to smooth plant operation.

 

DTSX gives you the insight needed to proactively prevent abnormal situations, reduce safety and fire risks, and identify irregular conditions and shifts in process applications.

Our fiber optic temperature sensing products offer high reliability, accuracy, and quick update times to ensure 24/7 monitoring of the application with no downtime for maintenance.

Watch the video to learn more.

 

More Information about Distributed Temperature Sensing

What is Distributed Temperature Sensing?
How Does DTS Work?
What is the Raman Scatter Principle?

  • DTSX1 is an all-in-one heat detection solution. It is a self-contained, ready-to-install solution.

  • The DTSX3000 is the long range, high accuracy product, with a measurement range of up to 50km, a temperature accuracy of 0.01 °C, and 19" rack design.

  • The DTSX200 is a short range, low sampling resolution capable product, with a measurement range of up to 6km, temperature accuracy of 0.1 °C, and a 19" rack design.

About Distributed Temperature Sensing

What Is Distributed Temperature Sensing?

Distributed temperature sensing (DTS) measures temperature distribution over the length of an optical fiber cable using the fiber itself as the sensing element. Unlike traditional electrical temperature measurement (thermocouples & RTD), the length of the fiber optic cable is the temperature sensor. Distributed temperature sensing can provide thousands of accurate and precise temperature measurements over a long distance. Compared to traditional electrical temperature measurements, distributed temperature sensing represent a cost-effective method for obtaining accurate and high resolution temperature measurement.

 

How Does It Work?

DTSX3000 50kmYokogawa DTSX3000 measures temperature and distance over the length of an optical fiber using the Raman scatter principle. A pulse of light (laser pulse) launched into an optical fiber is scattered by fiberglass molecules as it propagates down the fiber and exchanges energy with lattice vibrations. As the light pulse scatters down the fiber optic cable, it produces stokes signal (longer wavelength) and anti-stokes (shorter wavelength) signal, of which both signals shifted from the launch of the light source. The intensity ratio of the two signals components depends on the temperature at the position where the Raman scatter is produced.

This temperature can thus be determined by measuring the respective intensities of the stokes and anti-stokes signals. Furthermore, part of the scattered light, known as the backscatter, is guided back towards the light source. The position of the temperature reading can thus be determined by measuring the time taken for the backscatter to return to the source.

 

What Is the Raman Scatter Principle?

All light interacts with matter! For example, imagine standing in a pitch black garage with no external light source. Inside this garage is a bright red sports car. Needless to say, you cannot see the sports car or the color of the sports car itself. However, when you turn on the lights to the garage, you can immediately see the light source reflecting the bright red color off the car. The light that is bouncing off the red sports car is only bouncing off the "red" spectrum, therefore, your eyes see the sports car as, well, red.

What is Raman Scatter Principle

This phenomenon is also true when you shoot a pulse of light (laser pulse) off of a molecule, in this case, the fiberglass molecule in the optical fiber cable. When the light source enters the optical fiber cable, most of the light bounces (backscatter) back unchanged (no change in wavelength). However, a small amount of that light shifted/changed. That shift/change from the light source is called Raman Scatter. Since Raman Scatter is thermally influenced by temperature, the intensity depends on temperature. Distributed temperature sensing is capturing the shift/change from the propagating light pulse and measuring the intensities between the two signal components (stokes and anti-stokes).

Overview:

A belt conveyor fire detection solution employing the DTSX distributed optical fiber temperature sensor can greatly reduce crises that can threaten a company's survival.

Overview:

With industrial and economic development comes increasingly large and advanced power plants and factories. Nevertheless, we find many cases where the original cables, cable tunnels, and other components of the power infrastructure have languished under continuous operation.

Overview:

Reactor/Furnace Wall Healthiness Monitoring with a Fiber Optical Temperature Sensor

Overview:

Temperature Monitoring Solution for 
Quick Detection of Fires in Fume Ducts

Overview:

Temperature Monitoring Solution for Maximum VSD Operating Efficiency
 

Overview:

"Improved Detection of Bus Bar Overheating"

 

Customer Concerns

Bus bars for high current power distribution

Bus bars are uninsulated strips of a highly conductive metal such as copper or aluminum. As they have lower electrical resistance than insulated power cables, they can carry large electrical currents and are thus suitable for use in power distributions systems in power plants, substations, factories, and data centers. Bus bars are also used in power distribution boards. Bus bars offer great flexibility as they are made of highly malleable metals that can be easily shaped to suit any number of facility layouts.

Abnormal overheating of bus bars

Bus bars are bolted, clamped, or welded to each other and to other apparatuses. If a bolt or clamp comes lose or a welded joint fails, abnormal heating may occur at that location due to an increase in the electrical resistance. The overheating further increases the electrical resistance and can lead to a burnout or even a fire.

In order to prevent overheating at any of the bus connections, the connections should be inspected on a regular basis. However, as the bus bars are often inside plastic or metal bus ducts and covers, and are often in difficult to access locations, visual inspection can be difficult.

The burning out of a power supply bus bar is a threat to plant safety and can lead to an unplanned shutdown of plant operations. To eliminate such risks and avoid the huge costs of lost production, it is vital to quickly detect and immediately respond to any indication of overheating in a power bus bar.

Abnormal overheating of bus duct

The Solutions and the Benefits

24/7/365 temperature monitoring to detect overheating

Burnouts in a power bus bar can be prevented by quickly and accurately detecting abnormal rises in temperature and locating the hot spots. As bus bars are surrounded by strong electric fields, conventional electric sensors such as thermocouple thermometers are not suitable for this purpose. Bus bars also sometimes follow complicated paths through plant structures and other types of buildings and may have a number of blind spots that cannot be readily imaged using thermal imaging cameras.

The Yokogawa DTSX is a unique and innovative temperature monitoring solution that uses an optical fiber cable as a temperature sensor. Since the sensor is not affected by electromagnetic noise, the DTSX is able to monitor distribution of temperature in units of 1 meter accuracy under a strong electric field. By quickly detecting overheating and pinpointing the location of a hotspot, the DTSX ensures that any problem can be responded to immediately, before it leads to a costly and expensive plant shutdown.
The optical fiber cable can be installed directly on a bus bar and on the surface of a bus duct or cover.

Efficient inspection inside bus ducts

Thanks to its ability to continuously detect abnormal rises in temperature and pinpoint hot spots even when a bus bar is located inside a bus duct, the DTSX is also useful in maintenance applications such as locating bolts that need to be tightened.

The benefits

  • Accurate temperature monitoring under a strong electric field
  • Flexible sensor cable for complex extended structure
  • Quick detection with abnormal location to prevent burnout
  • Condition based inspection work by temperature changes
Cable laying example for bus duct

How DTSX Works

Measuring the intensity of Raman scattered light
Using pulses of laser light beamed through an optical fiber cable, the DTSX is able to detect temperature-dependent variations in signal frequency that are the result of a phenomenon known as Raman scattering that occurs along the entire length of the optical fiber cable, and it also can determine the locations of those temperature readings using light that is bounced back (backscattering) to the source.

Example: Along a 6,000 meter optical fiber cable, nearly 6,000 measurement points
By measuring how long it takes light to make a round trip back to the source (backscattering), the DTSX is able to calculate the location for each temperature reading. Abnormalities can be located with a spatial resolution of just one meter.

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Tutoriales

    Overview:

    In this webinar you will learn how temperature detection with DTS avoids loss of revenue. Leakage, accidents or malfunction means loss in production and thus loss of revenue. By detecting a fire or a system malfunction before major environmental damage occurs, the operator can significantly lower the risk profile to major environmental incidents. With DTS you can reduce risks and increase safety.

    After the webinar, attendees will leave with a basic understanding of DTS technology and where and how they can use DTS for their temperature solutions in different applications.

    Key Learning Objectives:

    • Understand the applications and benefits of Distributed Temperature Sensor as alternative against tradition temperature measurement
    • Learn how you get a better temperature profile
    • DTS technology as proven way for temperature measurement

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