High pressure discrimination based on optical fiber microsphere cavity Fizeau interferometer

Abstract

Ahigh pressure sensor based on an optical fiber micro sphere cavity Fizeau interferometer (MSC-FI) is presented in this paper.The sensorwas fabricated by use of a fusion splicer. The achieved pressure sensitivity of MSC-FI sensor was in the range of 500 to 7000pi to be 4×10 -4 nm/psi. With a 10 pm resolution for the wavelength shift detection, the resolution of the device at room temperature for pressure measurement is to be 25 psi. This sensor can be used as a high pressure sensor in downhole application.

Simultaneous measurement of refractive index and temperature with micro silica sphere cavity hybrid Fabry Perot optical fiber sensor

“…MSSC-HFP sensor fabrication was reported in Ref. [5]. Sensor with 500 μm diameter and 100 μm air gap was used.…”

“…In this article, Micro Silica Sphere Cavity Hybrid Fabry Perot (MSSC-HFP) optical fiber sensor based upon micro silica sphere cavity is reported to simultaneously measure RIRI and temperature. For this purpose, a single mode optical fiber and capillary tube were used to fabricate sensor head [5]. The length (L) between optical lead in fiber and micro silica sphere was adjusted to make a hybrid Fabry Perot (HFP) cavity.…”

“…(a) sensor spectrum when the L was adjusted in a manner that beams reflected back from surface two cannot recouped back to lead in fiber (MSSC-Fizeau interferometer[5]), (b) MSSC-Hybrid Fabry Perot spectrum.…”