ShiKe SICK the principle of optical fiber sensor

by:FOT     2020-07-07

ShiKe SICK the principle of optical fiber sensor on ShiKe SICK 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, recycled by measuring the transmission properties of optical influence, complete the measurement. ShiKe SICK there are two kinds of measuring principle of fiber optic equipment sensor. ( 1) Property type optical fiber sensor principle, property type optical fiber 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. ( 2) The structure that structural principle of optical fiber sensor, optical fiber sensor is composed of optical detecting element ( Sensitive 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. ShiKe SICK fiber optic sensor optical fiber has many excellent properties, such as: resistance performance of electromagnetic and atomic radiation interference, diameter of fine, soft, light mechanical properties; Insulation, without induction electrical properties; Water resistant, high temperature resistant, corrosion resistance of the chemical properties, etc. , it can be in the place where people can not reach, or harmful to the people of the region ( Such as the radiation zone) , have the effect of human eyes and ears, and still can go beyond physical boundaries, receiving people feel less than the outside world of the senses. ShiKe SICK fiber optic sensor features: a, high sensitivity; Second, the adaptive functions of geometry, can be made into any shape of the optical fiber sensor; Three, can manufacture sensing various physical information ( Sound, magnetic, temperature, rotation, etc. ) The device; Four, can be used in high pressure, electrical noise, high temperature, corrosion, or other severe environment; Five, and inherent compatibility with optical remote sensing technology. ShiKe SICK the advantages of optical fiber sensor is compared with the traditional all kinds of sensors, optical fiber sensor used as sensitive information carrier, using optical fiber as transmission of sensitive information medium, 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. ShiKe SICK, 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. ShiKe SICK the working principle of optical fiber sensor is to use two beams of multimode optical fiber, one end of the merger of optical fiber probe, the other end was divided into two beams, respectively, as the light source and optical fiber. When this infrared light emitter occurs, the irradiation light optical fiber to the reflector, is reflected light upon receiving optical fiber, spread to the photoelectric conversion element will receive light signals into electrical signals. The output light intensity and the reflector is apart from the optical fiber probe has certain function relation between the distance, so the displacement can be obtained by light intensity detection. In young's modulus of metal wire in the cylinder by using the reflection of magnets nickel plated metal, make its can move according to the steel wire elongation. Infrared sensor fixed on the bracket and then on the sensor measuring instrument will get the potential difference of the experiment by changing the displacement value, ShiKe SICK fiber optic sensor through testing for many times, both the rotation sensor measuring instrument's own moth spiral micrometer gauge, namely change the distance between probes and sheet metal and location, when there is a long experiment records steel wire of the secondary potential difference of the value, the record at this time of the spiral micrometer gauge readings. The test shows that using infrared range this method operation is simple. Just put the probe and the reflector plate after it is installed directly to the actual measured the tray addition yards, the result of measurement is much better than traditional tests.

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