Abstract
Optical fiber chemical sensor based surface Plasmon resonance for sensing and measuring the refractive index and concentration for Acetic acid is designed and implemented during this work. Optical grade plastic optical fibers with a diameter of 1000μm were used with a diameter core of 980μm and a cladding of 20μm, where the sensor is fabricated by a small part (10mm) of optical fiber in the middle is embedded in a resin block and then the polishing process is done, after that it is deposited with about (40nm) thickness of gold metal and the Acetic acid is placed on the sensing probe.
Highlights
Optical fiber sensors based on SPR have been widely studied over the past 20 years with many configurations that often use multi-mode optical fibers with large cores and plastic claddings [1]
The values of the parameters used in the numerical calculations and in the experimental study were: fiber optic numerical aperture (NA) =0.51, fiber core diameter (D) =980 μm, sensing length (L) =10 mm, metal layer thickness (d) =40 nm and different values (1.346, 1.359, 1.364, 1.392, 1.417 and 1.429) of refractive index from sucrose /water solutions
Normalized transmitted power (T), calculated as a percentage is from the ratio of the intensity (I) measured in the presence of a sample and the intensity of the optical signal reference ( ) that measured in the lack of the sample, is plotted in Fig.6 as a function of the wavelength expressed in nm, this Figure called SPR curve
Summary
Optical fiber sensors based on SPR have been widely studied over the past 20 years with many configurations that often use multi-mode optical fibers with large cores and plastic claddings [1]. Several optical systems based (SPR) has been developed to act as chemical sensors, refractometers or even to measure the thickness for metals and thin films. Ghufran Mohammed Jassam and Sudad S.Al – Bassam many achievements to provide developed sensors especially after their participation in optical fiber technology This type of sensors, optical fiber sensor based SPR, is useful in many areas because of its important features such as label-free samples, very small amount of sample, monitoring in hard-to-reach environments, extremely fast response, miniature components, remote sensing, low coast as well as its good performance parameters [5, 6]. Theoretical basis The sensing of the SPR sensors is based on optical fiber This type of sensors mainly consists of three layers: optical fiber core, thin layer of metal, and sensing medium as shown in Fig..
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