Optical fibers can be made into interferometric sensors such as fiber-optic gyroscopes, which are used in the Boeing 767 and in some car models (for navigation purposes). They are also used to make hydrogen sensors. Their high sensitivity, immunity to electromagnetic. Fiber optic current sensors are revolutionizing the way electrical currents are measured, providing high sensitivity, immunity to electromagnetic interference (EMI), and the ability to function in harsh environments. These sensors are capable of measuring a wide range of physical and chemical parameters such as temperature, pressure, vibration, displacement.