Pressure, temperature and refractive index determination of fluids using a single fibre optic point sensor

Abstract

The accurate determination of physico-chemical fluid parameters is of major importance in many process engineering applications. Not only the monitoring of the phase distribution in piping systems but also the detection of chemical concentrations in liquids is of interest for an efficient, safe and reliable operation of laboratory as well as industry scale applications. In this paper, we present a miniature all-silica fiber optic sensor capable of measuring pressure, temperature and refractive index of a fluid at a single point simultaneously. In future, such a sensor can be utilized in applications, where these quantities and, hence, phase composition or chemical concentration have to be monitored possibly under harsh environments such as geothermal or oil drilling wells.

Fiber optic magnetic field sensor using Co doped ZnO nanorods as cladding

“…Sensitivity analysis. The sensitivity of the proposed magnetic eld sensor is calculated using the following relation, 56 Sð%Þ ¼ jI m À I a j I a  100 (10) where I a is the intensity in the absence of a magnetic eld and I m is the intensity in the presence of a magnetic eld. Fig.…”

Multiparameter fiber-optic sensors: a review

“…This approach can be combined with most interferometric and grating principles that are otherwise utilized for measurement of other parameters (temperature, pressure, etc.). 1,[133][134][135][136][137][138][139][140][141][142][143][144][145][146][147][148] In more advanced designs, measurement of the reflection ratio from two adjacent sensors' surfaces is utilized to reduce the sensitivity of the measurement to variability in interrogator-to-sensor interconnection losses and source variability. This is achieved through proper signal processing that utilizes IDFT of back-reflected spectrum to determine and compare reflectance from multiple sensors' surfaces, 134,135,139 as shown in Fig.…”

ZnO ALD-Coated Microsphere-Based Sensors for Temperature Measurements

“…Among them, all fiber-optic sensors stand out and, as a consequence, their development has been steadily progressing throughout the years thanks to the ease of use of these devices, their high durability, low fabrication cost, and chemical inertness [ 20 , 21 , 22 ]. Over the last decade, researchers gained new measurement techniques using fiber-optic sensors, such as: hybrid fiber-optic sensing, GOD-complex-based (glucose oxidase complex) sensors, multi-parameter sensors, deformable micro-mirror sensors or core-offset splicing [ 23 , 24 , 25 , 26 , 27 , 28 ]. The requirement for the long-term monitoring of temperature in severe, remote conditions caused fiber-optic sensors application in many fields, including industry, e.g., building applications, oil leakage railway infrastructure [ 29 , 30 , 31 , 32 , 33 ], but also they are used in biochemistry [ 34 ].…”