Fabrication Of Optical Fiber Sensors Research Articles

In Situ Synthesis of Gold Nanoparticles in Layer-by-Layer Polymeric Coatings for the Fabrication of Optical Fiber Sensors.

A new method is proposed to tune the interferometric response of wavelength-based optical fiber sensors. Using the nanoparticle in situ synthesis (ISS) technique, it is possible to synthesize gold nanoparticles (AuNPs) within a pre-existing polymeric thin film deposited at the end-face of an optical fiber. This post-process technique allows us to adjust the optical response of the device. The effect of the progressive synthesis of AuNPs upon polymeric film contributed to a remarkable optical contrast enhancement and a very high tuning capability of the reflection spectra in the visible and near-infrared region. The spectral response of the sensor to relative humidity (RH) variations was studied as a proof of concept. These results suggest that the ISS technique can be a useful tool for fiber optic sensor manufacturing.

Fabrication of Optical Fiber Sensors for Measuring Ageing Transformer Oil in Wavelength

In this paper, the fabrication and characterization of an optical fiber refractometer for detecting ageing transformer oil is presented. Tin-dioxide thin films have been used for the fabrication of optical fiber interferometers. Indium-tin-oxide thin films deposited on the optical fibers are used as the lossy mode resonance supporting coatings. This optical fiber sensor is based on the variation of an oil refractive index. This is detected by a wavelength shift in the optical fiber sensor's spectral response. The fabricated sensors enable an accurate determination of ageing transformer oil, which reveals their potential in real-life applications.

Fabrication of optical fiber sensor based on double-layer SU-8 diaphragm and the partial discharge detection

In this paper, a partial discharge detection system is proposed using an optical fiber Fabry-Perot (FP) interferometric sensor, which is fabricated by photolithography. SU-8 photoresist is employed due to its low Young’s modulus and potentially high sensitivity for ultrasound detection. The FP cavity is formed by coating the fiber end face with two layers of SU-8 so that the cavity can be controlled by the thickness of the middle layer of SU-8. Static pressure measurement experiments are done to estimate the sensing performance. The results show that the SU-8 based sensor has a sensitivity of 154.8 nm/kPa, which is much higher than that of silica based sensor under the same condition. Moreover, the sensor is demonstrated successfully to detect ultrasound from electrode discharge.