An efficacious hybrid interferometer based on a Vernier-like effect for dual parameter sensing

Abstract

ObjectiveAn efficacious hybrid optical device based on a Vernier-like effect for dual parameter sensing is proposed. The device may find potential applications for simultaneous strain and temperature monitoring for many industries such as, environmental, biotechnology, and chemical engineering. MethodThe device configuration is composed of a Michelson interferometer (MI) cascaded with a Fabry-Perot interferometer (FPI). In the manufacturing, cascaded formation of single-mode fiber (SMF), a small segment of multi-mode fiber (MMF), double side hole fiber-1 (DSHF-1), hollow Core fiber (HCF), and an infinitely extended double side hole fiber-2 (DSHF-2) are spliced together. A series of experiment demonstrates that the proposed interferometer generates an efficacious Vernier-like effect with a slight differential factor of MI and FPI spectral interferences, and this hybrid device is fully capable of measuring strain and temperature simultaneously. ResultsThe device is easy to fabricate and is made entirely by using ordinary laboratory equipment. The device is composed of unmodified optical fibers, which guarantees the robustness of the device. The experimental demonstration shows that the maximal strain sensitivity of the device is obtained as ~8.77 pm/µε with high resolution tracing steps, whereas temperature sensitivity is achieved as ~213 pm/°C.