We present a new sensor design of a polymer-based Fiber Bragg Grating (FBG) on a D-shaped optical fiber for detection of variation of temperature and strain. The gratings are molded and are at the proximity to the fiber core, which is made by fiber-assisted UV lithography. The process is suitable for generating optical fiber-based sensors with high repeatability in simple processes. The proposed sensor can be multiplexed, so an array of the proposed sensors will be suitable in detecting a wide range of environmental conditions.
A novel miniature dual cavity Fabry–Perot sensor is presented for simultaneous measurements of pressure and temperature in this work. Both of the pressure and the temperature sensing cavities are fabricated by using a single step UV molding process which is simple, cost-effective, and safe procedure. The pressure sensor is composed of an UV molded cavity covered by a metal/polymer composite diaphragm for a high pressure sensitivity with a miniature sensor size. The temperature sensor is made of a short segment of UV curable polymer, which renders a high temperature sensitivity due to the material’s large thermal expansion. By exploiting the material characteristic of the polymer around 90% of size-reduction could be achieved with 88.5% of temperature sensitivity of the previously reported sensor made of pure silica. The overall sensor size is around 150 μm in diameter and 55 μm in length. Experimental studies show that the sensor has a good linearity over a pressure range of 1.0 to 4.0 psi with a pressure sensitivity of 0.137 μm/psi at 28 °C, and a temperature range of 28.0 °C to 42.4 °C with a temperature sensitivity of 0.0026 μm/◦C. The sensor can be applied to many biomedical applications that require pressure and temperature simultaneous measurements with minimum intrusiveness.
We present a surface-mountable miniature Fabry-Perot (FP) pressure sensor that exploits the total internal reflection at a
polished 45° angled fiber end face to swerve the optical axis by 90°. Optical analysis of the sensor system is performed
based in ABCD method in terms of intensity of the beams reflected from each mirror and visibility of the sensor
compared to conventional sensor system. One unique feature of the surface-mountable sensor is its embeddability with
minimum intrusiveness to the system. By using the fiber as a waveguide, as well as an inherent mask for
photolithography, a self-aligned FP cavity is constructed. A polymer-metal composite diaphragm is employed as a
deflection diaphragm for pressure sensing which enables achieving higher sensitivity and low-cost fabrication over
silicon diaphragm. The sensor exhibits a good linearity over the designed pressure range. Fiber Bragg grating is
embedded in the vicinity of the pressure sensor to solve the problem of cross sensitivity between pressure and
temperature by measuring the temperature of the system and compensating the temperature effect. This sensor is
expected to impact many fronts where temperature effect should be considered to perform reliable and accurate pressure
measurement with minimum intrusiveness.
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