Output properties of fiber optic sensor for micro-displacement measurement at 77 K and 4.2 K Original Research Article

Fiber optic sensors for micro-displacement measurement are applied to displacement measurement of superconductors. Output characteristics of a fiber optic sensor were measured at 77 K and 4.2 K. The results show that the linearity between output voltage ratio and displacement is good both at 77 K and at 4.2 K, and the sensitivity at 77 K is higher than that at 4.2 K.