Fiber Bragg Grating Sensors

What this topic covers

Optical wavelength shifts used to measure strain and temperature.

Core monitoring ideas

An FBG reflects a narrow wavelength band that shifts with strain or temperature.

Multiple gratings can be multiplexed along a single fiber.

Temperature effects must be separated from mechanical strain where needed.

Interpretation limits

Sensor placement should follow the structural question rather than a generic grid spacing.

Evidence and data quality

Calibration, mounting and sensor health are part of the measurement system and must be tracked.

Lifecycle use

Combining complementary sensor types can reduce ambiguity when one measurement alone cannot explain a change.