FBG Sensor
What is Fiber Bragg Grating (FBG)?
optical fibers; They are flexible, light and transparent structures made of glass or plastic materials and produced in a slightly thicker diameter than a human hair. The structure of a particular region of glass fibers (typically a few millimeters) is altered by UV-rays, creating a periodic grid pattern in the fiber core. This grid structure is called fiber Bragg grid.
FBG Sensor Technology: Fiber Bragg gratings reflect back a certain wavelength (central wavelength) of incoming light. The parameter to be measured changes the size of the fiber, causing the grating gap to narrow and widen. As the grating period changes, the wavelength of the reflected light changes. It is possible to measure various physical and/or chemical parameters by detecting changes in wavelength. With FBG sensors, multiple effects can be measured simultaneously on the same fiber.
Parameters that can be measured
- Heat
- strain
- Pressure
- Force
- Vibration
- Acceleration
- Substitution
- liquid level
- flow rate
- pH
- Moisture
- Gas
ADVANTAGES
- Measurements can be taken from different points along the same fiber line with multiple FBG writing.
- Different physical parameters such as temperature, pressure, strain can be measured simultaneously.
- Continuous and simultaneous measurements can be taken.
- Measurements can be taken without loss of data over long distances in the range of kilometers.
- It is not affected by electromagnetic and radio-frequency interference (EMI & RFI). It provides information security and can be used easily in environments with high magnetic field.
- It is a passive circuit element. Does not require electrical supply.
- Thanks to its small size, flexible and light structure, it can be used as embedded in different structures.
- It is easy to install.
- They are long lasting.
- Sensor stability is high in continuous use. It can be used on the same structure for many years without the need for any maintenance and repair.
- They can operate in harsh environmental conditions such as high (1000°C) or cryogenic temperatures, vibration and corrosive liquids.
- They provide high sensitivity.
