The working principle of optical fiber sensor and application field

by:FOT     2020-06-25
The basic working principle of sensor is to light through the from the light source to the modulator, the parameters under test and after entering modulation OuDeGuang interaction, leads to the optical properties of the light ( As the light intensity, wavelength, frequency, phase and skewed normal, etc. ) Change, is called a modulated signal light, after fiber into light detector, after demodulation, obtain the parameter being measured. fiber optic equipment sensor is applied to the magnetic, sound, pressure, temperature, displacement, acceleration, gyroscope, liquid level, torque, light, and physical quantities such as current and strain measurement. Fiber optic sensor application range is very wide, almost all important areas related to national economy and national defense and People's Daily life, especially can safely and effectively used in the bad environment, solved many industry over the years there has been a technical problem, has great market demand. Mainly manifested in the following aspects of application: low city construction, Bridges, DAMS, oil field and other interference of gyroscope and grating pressure sensor applications. Optical fiber sensors can be embedded in concrete, carbon fiber reinforced plastics and various kinds of composite materials, used to test the stress relaxation, construction stress and dynamic load stress, short-term construction stage to assess the bridge structure performance and long-term operating status. Low in power system, it is necessary to determine the parameters such as temperature, current, such as the high voltage transformer and the detection of temperature in the large motor stator and rotor, etc. , due to the electric sensors are vulnerable to the interference of electromagnetic field, cannot be used on such occasions, can only use fiber optic sensor. Distributed temperature sensor is in recent years developed a kind of space used for real-time measurement of temperature field distribution of high and new technology, the distributed temperature sensor system not only has the advantages of fiber optic sensor generally, also has on each point of the temperature distribution along the fiber optic sensing ability, take advantage of the features we can continuous real-time measurement of , the temperature at various points within a few kilometers along the position precision can reach m level, the level of measurement precision can reach 1 degree, the temperature measurement of a wide range of node applications very applicable.
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