Abstract

A Fabry–Perot interferometer displacement sensor is proposed and demonstrated. This sensor is prepared by inserting two ceramic ferrules into a polydimethylsiloxane (PDMS) hose to generate a Fabry–Perot cavity. The cavity is filled with nematic liquid crystals (NLCs), which induce a Vernier effect due to the birefringence of NLCs. The flexible PDMS hose makes the cavity length adjustable. A displacement sensor with sensitivity of $\sim 2.97\mathrm{nm}/\mathrm{\mu m}$ and a dynamic range of 0.9 mm at the center wavelength of 1550 nm is experimentally demonstrated.

© 2019 Optical Society of America

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