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Structure And Transmission Principle Of Fiber Optic Switch Sensor
Jun 19, 2017

How to open the Fiber Optic Switch, the main function, power lines and signal lines, sensor head, including: threaded metal shell, laser emission head, fiber, nut. The main body of the optical switch function includes a laser receiving tube and a functional circuit board. The composite cable includes fiber and wire. The sensor head is separated from the main body by a composite connection line. The fiber in the sensor head surrounds the laser emitting head, the diameter of the optical fiber is between 0.125mm and 0.5mm, the diameter of the laser emitting head is 4_, the outside of the sensor head is cylindrical Type threaded metal housing. With a wide voltage range, repeat positioning accuracy, fast frequency response, anti-interference and waterproof performance, high temperature, and easy installation and commissioning, long service life and so on.

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1, optical Fiber Optic Switch sensor structure:

Optical fiber referred to as fiber, the basic use of quartz glass, there are different doping. The optical fiber's light guide capability depends on the nature of the core and the cladding, and the refractive index of the core is slightly larger than the cladding refractive index. The fiber structure is mainly composed of three parts: center core, outer cladding, jacket nylon plastic.

2, optical Fiber Optic Switch sensor transmission principle:

The light is spread in space, and the light is limited to the fiber in the fiber and can travel far away with the fiber. The propagation of the fiber is based on the total reflection of the light. When the light incident at different angles to the end of the fiber, the refraction of the end of the fiber into the fiber into the fiber after the incident to the core and cladding interface, part of the transmission to the cladding, part of the reflection back to the core. When the optical fiber in the fiber end of the center of the incident angle is reduced to an angle, the light all reflected back to the fiber. When the light is totally reflected, the angle of incidence is the critical angle, and the light propagates forward at the interface between the core and the cladding, and is emitted from the other end.

In order to ensure total reflection, must meet the total reflection conditions, the fiber from the refractive index of the media into the core, to achieve the total reflection of the critical angle of incidence.

It can be seen that the size of the critical incident contact of the fiber is determined by the nature of the fiber itself, regardless of the geometry of the fiber.