**Applications of Fiber-Optic Interferometry Technology in Sensor Fields Applications of Fiber-Optic Interferometry Technology in Sensor Fields**

Lutang Wang and Nian Fang Lutang Wang and Nian Fang

Additional information is available at the end of the chapter Additional information is available at the end of the chapter

http://dx.doi.org/10.5772/66276

### **Abstract**

Optical interferometry as a precision metrology has been widely employed in many aspects for accurate measurements of various physical quantities. As an important branch of measurement technology, now the fiber-optic interferometry technology, based on fiber-optic and laser technologies, has been developed and widely applied in sensor fields for detections of various unknown or uncontrolled physical parameters. In this chapter, basic concepts of fiber-optic interferometry are presented and clarified. Also, three novel fiber-optic sensors, based on the optical interferometry technology and mainly used in the power industry for equipment failure monitoring, are demonstrated.

**Keywords:** optical interferometry, laser, fiber-optic sensor, interference fringe, fiber Bragg grating-based interferometer
