FOT

Optical fiber sensor principle

by:FOT     2020-06-22

there are two kinds of measuring principle of fiber optic sensor: ( 1) 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. ( 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. 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 the measurement.


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