about Fiber Bragg Gratings (FBG), FBG Sensors and Monitoring Systems

Total information about fiber optic temperature sensor

on January 14, 2019

Today all modern industries include highly complex and sensitive operations that require permanent operational conditions which are possible to provide due to the use of advanced technologies for temperature measurement. One of the potential solutions is the use of fiber optic temperature sensors.


There are several ways of temperature measurement: classic mercury glass thermometer, infrared pyrometer, electronic thermometer. However, the most effective method is fiber temperature sensing because it provides accurate measurement compared to mentioned techniques and has numerous fields of application such as high voltage machines, nuclear power plants, chemical power plants etc.

The types of fiber temperature sensors include interferometric and non-interferometric sensors. The traditional non-interferometric sensor has multi-mode optical fiber construction and materials that are sensitive to temperature. Also, they are able to register changes, for example, absorption, transmission and reflection parameters due to temperature variation.

The simple interferometric fiber optic temperature sensors are more flexible and provide the sensitivity of higher level. The fields of the use include temperature, pressure, rotation, strain etc. The principle of the operation is the comparison of the beam phase through sensing fiber with the reference beam.

The advantages of optical temperature sensors:

  • Immunity to electromagnetic and stray radiation;
  • Possibility of the use in hard electrical conditions;
  • Greater accuracy and faster response time;
  • Light weight and compact size;
  • Low cost;
  • Wide temperature measurement range.

Nevertheless, fiber optic temperature sensors are not ideal and have some disadvantages such as different temperature range of operation and measurement accuracy for different types of sensors, the difficulties of development expensive price for some optical sensors.

Optromix is a fast-growing vendor of fiber Bragg grating (FBG) products line such as fiber Bragg grating sensors, FBG interrogators and multiplexers, Distributed Acoustic Sensing (DAS) systems, Distributed Temperature Sensing (DTS)systems. The company creates and supplies a broad variety of fiber optic solutions for monitoring worldwide. If you are interested in temperature measurement systems and want to learn more, please contact us at

editorTotal information about fiber optic temperature sensor

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