Similarly, there is a broad variety of different sensors based on FBG elements that allow for the measurement of temperature, pressure, strain, acceleration, moisture, bio-chemical agents, and many other parameters in diverse civil and defense applications that range from. Similarly, there is a broad variety of different sensors based on FBG elements that allow for the measurement of temperature, pressure, strain, acceleration, moisture, bio-chemical agents, and many other parameters in diverse civil and defense applications that range from. A fiber Bragg grating is a small length of optical fiber that comprises a pattern of many reflection points that creates a reflection of particular wavelengths of incident light. This structure can be created by intense UV light affecting the fiber core. The distance between the reflection points. These studies demonstrated the ability of FBG sensors to accurately measure strain, displacement, and temperature changes in real time, which are critical for assessing the integrity of structures. Additionally, the use of FBG sensors in earthquake monitoring systems, as explored by López-Castro et. Fiber Bragg gratings are periodic variations in the refractive index inscribed along the core of an optical fiber. These sensors reflect only certain colors of light. This lets them notice even small changes around them.