Device and method for detecting angle of shearer rocker arm based on optical fiber sensing

A device for detecting an angle of a shearer rocker arm based on optical fiber sensing, comprising an optical system and a mechanical system, wherein the optical system comprises a broadband light source, a polarizer, a first collimating lens, a gradient-rotation media plate, a second collimating lens, a polarization beam splitter, and a data processing module;

• and the mechanical system comprises a connecting base, a first connecting rod, a second connecting rod, a slider, a bracket, and a sensor housing;
• the broadband light source is connected to the polarizer via a single-mode optical fiber, and the polarizer is connected to the first collimating lens via a rotary high birefringence photonic crystal fiber (Hi-Bi PCF);
• the first collimating lens and the second collimating lens have the central axes on the same line, and both are fixed to the slider;
• and the slider is located on the bracket and is slidable on the bracket, and the bracket is fixed inside the sensor housing;
• the gradient-rotation media plate is fixed in the sensor housing and located between the first and second collimating lenses and;
• the second collimating lens is connected to the polarization beam splitter via a rotary Hi-Bi PCF;
• and the polarization beam splitter is connected to the data processing module via a single-mode optical fiber;
• and
• one end of the first connecting rod is connected to the connecting base via a hinge, and the first connecting rod and the connecting base are rotatable with respect to each other via the hinge;
• the other end of the first connecting rod is connected to the second connecting rod via a hinge, and the first connecting rod and the second connecting rod are rotatable with respect to each other via the hinge;
• and the other end of the second connecting rod is fixedly connected to the slider, and the second connecting rod is parallel to a length direction of the bracket.