FOT

Optical fiber sensor application range

by:FOT     2020-06-16
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, polarization, etc. ) Change, called a modulated signal light, before using the measured optical transmission characteristics of influence, complete the measurement.

1。 The structure of the fiber

2. Optical fiber transmission light principle

3. Working principle of the sensor

( 1) Functional & ndash; — Using the fiber itself made some sensitive feature or function

( 2) The light type & ndash; — Optical fiber transmission of light effect, only it's in the middle of the end face or add other sensor by measuring the change of the. ( 1]

there are two kinds of measuring principle of sensor.

( 1) Property type sensor principle, property type sensor is the use of fiber optic sensitivity to the environment changes, the input quantity transform for the modulation of optical signal. Its working principle is based on fiber optic light modulation effect of the fiber in the external environment factors, such as temperature, pressure, electric field, magnetic field, and so on change, its optical characteristics, such as phase and intensity, the phenomenon of change.

so, if we can measure by the light of the phase, the light intensity change, you can know the change of physical quantity being measured. This kind of sensor is also known as sensitive element type or functional fiber optic sensor. Laser point light beam spread for parallel wave, the beam splitter can be divided into two road, a benchmark for optical path, the other for measuring light path. The parameters ( Temperature, pressure, vibration, etc. ) Cause the change of fiber length and phase of light phase change, resulting in a different number of interference fringes, counting on its mode to mobile can be measured, such as temperature or pressure.

( 2) The structure that structural principle of sensor, sensor is composed of optical detecting element ( Sensitive element) With transmission circuit and measurement circuit of measuring system. The as transmission medium of light only, so also known as the light type or non functional fiber optic sensor.

edit a fiber optic sensor characteristic. High sensitivity;

2. Has many aspects of adaptability, geometric shapes can be made into any shape of the sensor;

3. Can make sensing various physical information ( Sound, magnetic, temperature, rotation, etc. ) The device;

4. Can be used in high pressure, electrical noise, high temperature, corrosion, or other severe environment;

5. And internal compatibility with optical remote sensing technology.

the advantages of sensor is compared with the traditional all kinds of sensors, sensor used as sensitive information carrier, using as transmission of sensitive information medium, has the characteristics of and optical measurement, a series of unique advantages. Electric insulation performance is good, strong electromagnetic interference resistance, non-invasive, high sensitivity, easy to implement remote monitoring of measured signal, corrosion, explosion-proof, optical path can be flexing resistance, convenient for connecting with the computer.

sensor sensitive towards, compact, strong adaptability, and intelligent direction, it can be in the place where people can not reach, Such as high temperature or harmful to the people of the region, such as the radiation zone) , have eyes and ears of the man, and still can go beyond physical boundaries, receives people's senses feel outside information. ( 2]

fiber optic sensor application editor insulator grubby, magnetic, acoustic, pressure, temperature, displacement, acceleration, gyroscope, liquid level, torque, photoacoustic, current and sensor can be used for displacement, vibration, rotation, pressure, bending, strain, velocity, acceleration, current, voltage, humidity, temperature, magnetic field, acoustic field, flow rate, concentration, PH and strain measurements of physical properties. 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:

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.

in power system, the need to determine 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.


One increasingly popular managerial tactic to improve problem-solving performance of fiber optic equipment is to increase the connectedness, or what academics call clustering, of the organization
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