A low-finesse Fabry–Pérot interferometer for use in displacement measurements with applications in absolute gravimetry

Abstract

A low-finesse Fabry-Pérot interferometer is used to determine long and fast displacements. Two corner cube reflectors form the traveling-wave cavity and one beam splitter couples the input collimated laser beam. Given the retrodirective property of corner cube reflectors, the cavity operates at the edge of stability over an extended scanning range. The in-line scheme with a single fixed optical component makes the proposed interferometer robust and easy to align and use. These characteristics are particularly useful in applications running in noisy environments, such as in on-field absolute gravimetry. Experimental data showing the performances reached in a transportable ballistic gravimeter are also presented.

Iodine Absorption Cells Purity Testing

“…There are numerous applications where the robustness, simplicity, cost and reliability together with a compact design play a key role. Examples of that are systems designed for airborne or even space-borne applications [ 7 ], optical telecommunications [ 8 ] or lasers for ballistic gravimeters [ 9 ].…”

Spatial Frequency Multiplexing of Fiber-Optic Interferometric Refractive Index Sensors Based on Graded-Index Multimode Fibers

“…Therefore, the precise measurement of refractive index is very important. Fiber-optic Fabry-Perot sensors have been developed as extremely high-precision sensing devices for precise measurement of RI [ 1 , 2 ], temperature [ 3 – 6 ], strain [ 6 , 7 ], pressure [ 8 ], and displacement [ 9 ], etc . Fiber-optic sensors have the advantages of high sensitivity, small size, resistance to electromagnetic interference, fast response, potential for multiplexing and high tolerance to harsh environments, etc .…”