Design of reflective optical fiber displacement sensor using double optical paths

Wenlong Du

Computer and Communication Engineering, Huaian College of Information Technology, China 

A reflective optical fiber displacement sensor using double optical paths is designed based on the principle of reflective optical fiber displacement sensor. The sensor has double optical paths composed of random fiber and semicircle fiber. The output signal of double optical paths is disposed by using the preamplifier, intermediate amplifier, band-pass filter and AC to RMS circuit. The ratio and the displacement of the output signals of the two optical paths have linear relationship, effectively enlarging the measuring range on basis of the accuracy of measurement.