P + F the working principle of optical fiber sensor
the working principle of fiber optic sensor p + p + F F the basic working principle of optical fiber sensor is to light through the optical fiber 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 P + F fiber optic sensor measurement principle, there are two.
Property type optical fiber sensor principle, property type fiber optic equipment 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.
Therefore, if we can measure by the light of the optical fiber 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.
The structure that structural principle of optical fiber sensor, optical fiber sensor is composed of optical detecting element (
With optical fiber transmission circuit and measurement circuit of measuring system.
The optical fiber as transmission medium of light only, so also known as the light type or non functional fiber optic sensor.
P + F characteristics of a fiber optic sensor.
Has many aspects of adaptability, geometric shapes can be made into any shape of the optical fiber sensor;
Can make sensing various physical information (
Sound, magnetic, temperature, rotation, etc. )
Can be used in high pressure, electrical noise, high temperature, corrosion, or other severe environment;
And internal compatibility with optical remote sensing technology.
P + F the advantages of optical fiber sensor is compared with the traditional all kinds of sensors, P + F run as sensitive information carrier fiber optic equipment sensor, optical fiber was used as a medium passing sensitive information, has the characteristics of optical fiber 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.
P + F, optical fiber sensor in sensitive and adaptable, compact 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 P + F optical fiber sensors can be paste on the surface structure is used to measure, at the same time can also be achieved by embedded structure internal physical quantity measurement.
Using the embedded optical fiber sensors in advance, in the process of damaged concrete structure can be internal strain measurement, according to the load and strain relationship curve slope, can determine the structure formation and expansion of internal damage.
Through concrete experiment showed that the load and the strain of fiber optic test curve is higher than strain gauge testing linearity.
P + F fiber optic sensor light resistance, durability and long-term stability, make its can be applied to a convenient construction steel structure and concrete internal stress and strain test of various kinds of building materials.
Implementation of the health detection of structures.
P + F optical fiber sensor is another major types of make use of the optical fiber sensor.
Its structure is as follows: roughly sensors located in the optical fiber end, the optical fiber is only light transmission line, will be measured quantity transformation become light amplitude, phase and amplitude changes.
In this kind of sensor system, combination of traditional sensors and optical fiber.
The import of the fiber makes the realization of remote sensing probe provides a possibility.
The optical fiber transmission sensor applicability is wide and convenient use, but a little lower than * class sensor precision.
P + F the working principle of fiber optic sensor < / P >
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