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Structure And Transmission Principle Of Fiber Optic Switch Sensor
Sep 25, 2017

1, optical Fiber Optic Switch sensor structure:

Fiber Optic Switch referred to as fiber, the basic use of quartz glass, there are different doping. The guiding ability of the optical fiber 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. Fiber structure mainly by the central core, outer cladding, jacket nylon plastic three parts.

2, 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 reduced to an angle, the light reflected all the fiber back. When the light is totally reflected, the angle of incidence is the critical angle, and the light is propagated forward by the total reflection on the interface between the core and the cladding, and finally 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.