Japan KEYENCE working principle of the optical fiber sensor

by:FOT     2020-06-24
< P > keyence 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. Fiber optical principle 3. The working principle of the sensor ( 1) Functional - — Using the itself made some sensitive feature or function ( 2) The light type - — 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. There are two kinds of sensor of measuring principle. ( 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. Therefore, 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. < / P >
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