The fiber optic sensors also referred to as optical fiber sensors use optical fiber as sensing element. These sensors are used to sense parameters like temperature, pressure, vibrations, displacements, rotations or concentration levels of chemical species. Fiber based sensors have many uses in the field of remote sensing because they require no electrical power and their physical compactness.
Fiber optic sensors are ideal for measuring parameters like noise, high vibration, extreme heat, humidity and many others. These sensors highly compact hence may be positioned correctly wherever flexible fibers are needed. The wavelength shift can be calculated using optical frequency-domain reflectometry techniques. The time-delay of the fiber optic sensors can be measured using a device such as an optical time-domain Reflectometer (OTDR).