Application of optical fiber sensing technology in various a

At present, there are four kinds of optical fiber sensors, including fiber optic gyroscope, fiber optic hydrophone, fiber Bragg grating sensor and fiber current sensor. Among them, the fiber optic gyroscope has three types of interference type, resonant type and Brillouin type. The interferometric fiber optic gyroscope is the first commercialized stage of technology. The resonant fiber optic gyroscope is the second generation in the laboratory study stage. The Brillouin fiber optic gyroscope is the third generation fiber optic gyroscope sensor at the stage of theoretical study; Fiber hydrophone is an underwater acoustic signal sensor based on optical fiber and optoelectronic technology.

Through highly sensitive optical fiber coherence detection, the sensor converts sound signals in water into light signals, and then converts to sound signals through fiber to signal processing system. This sensor can be divided into interference type, intensity type and grating type according to the principle. Strain sensing is included in the fiber grating sensor products. The optical fiber Bragg grating sensor is the hot spot in these years, most of which belong to the light intensity type and the interference type, and each have the advantages and disadvantages. Since this year, the development of electric power has been a rapid development, in this case, in the face of the measurement of strong current, fiber optic current sensors can be very good to avoid some accidents caused by excessive power.

The application of optical fiber sensing technology in the construction of Engineering Internet, now, in the construction process of highway and bridge, tunnel collapse, fire, bridge crack and other safety accidents often occur, which not only poses a serious threat to people's life and property safety, but also has a certain impact on the economic development of our country.