Optical fiber sensor principle of work and attention in the use of mechanical and electrical equipment

Working principle of the optical fiber optical fiber sensor is by using the theory of complete internal reflection of light transmission of the waves of a medium, it is made of high refractive index of fiber core and cladding. The refractive index of less than the refractive index of fiber core, diameter roughly to 0. 1毫米~ 0。 2mm。 When light through the end penetration fiber core, on arrival and cladding interface, due to the complete internal reflection light, the light reflected back to fiber core layer. So after continuous reflection, the light can spread along the fiber core and only a small attenuation. Optical fiber sensor is to conduct the emitter light using optical fiber to the testing point, again to conduct the detected optical signals in optical fiber to the receiver to realize the detection. According to the different way of action, the optical fiber type sensor also can be divided into a variety of types such as correlation type and diffuse type. Optical fiber sensor can be implemented by detecting objects in remote areas. Because of the existence of fiber loss and optical fiber dispersion in the long-distance optical fiber transmission system, must be set up in line position intermediate amplifier, attenuation and distortion to the optical pulse signal processing and amplification. The use of optical fiber sensor in mechanical and electrical equipment note 1) Cannot be installed in the following places: direct sunlight, humidity is high, may be frosted, corrosive gas, has direct influence to vibration or shock of ontology; 2) Power lines, power lines and photoelectric switch when using the same wiring duct or wiring slot, will be caused by induced misoperation or damage to the product principle, please separate wiring or use the shielded wire. 3) Please use 0 the extension of wire. More than 3 mm line and control under 100 m; 4) After power on, after more than 200 ms to detect when the load is separated from the power of the optical fiber sensor, please be sure to first connect the power of the optical fiber sensor; 5) In output pulse cut off power supply when they happen, so need to cut off the load or the power of the load line; 6) When using the connector type, in order to prevent electric shock or short circuit, please do not use the connection of power supply terminals on protection with patch; 7) Amplifier disassembly and installation please be sure to cut off power supply; 8) Please don't in optical fiber unit fixed on the amplifier unit applied tensile, compression and other actions; 9) Make sure that when use shielding has cover; 10) Don't use banana oil, gasoline, acetone, oil clean.