Fiber optic sensing device and method

A steam turbine, comprising:

• a stationary casing;
• a rotor disposed in the stationary casing;
• and
• a fiber optic sensing system comprising one or more fiber optic sensors disposed on the stationary casing, the rotor, or combinations thereof, wherein the fiber optic sensing system is configured to detect one or more first parameters comprising temperature, strain, pressure, vibration, torque;
• or combinations thereof related to the stationary casing, the rotor, or combinations thereof.

A method comprising:

• directing light from a light source to a fiber optic sensing cable comprising a plurality of fiber optic sensors disposed on a stationary component, a rotary component, or combinations thereof;
• receiving reflected light from the plurality of fiber optic sensors using a detection system;
• and
• detecting one or more first parameters related to the stationary component, a rotary component, or combinations thereof comprising temperature, strain, pressure, vibration, torque, or combinations thereof based on shift in wavelength of light reflected from the plurality of fiber optic sensors;
• determining one or more second parameters comprising thermal expansion, clearance, fluid flow rate variation, condensation, fluid leakage, thermal loss, life, thermal stress, or combinations related to the stationary component, a rotary component, or combinations thereof based on the one or more first parameters.