| Summary: | 碩士 === 國立高雄應用科技大學 === 機械工程系 === 106 === In this paper, I have proposed a new coating process for tilted fiber Bragg grating sensor, as well as the new composite sensor for a variety of parameters at the same time monitoring. The sensing principle of Tilted fiber Bragg grating (TFBG) is that the light is refracted from the core mode to the cladding mode, and finally the spectrum of the TFBG produces a corresponding spectrum drift. The first part, the TFBG humidity sensor fabricated using the phase mask method to produce a TFBG that was then etched with five different diameters of 20 μm, 35 μm, 50 μm, 55 μm and 60 μm, after which piezoelectric inkjet technology was used to coat the grating with graphene oxide. According to the experimental results, the diameter of 20 μm yielded the best sensitivity. In addition, the experimental results showed that the wavelength sensitivity was −0.01 nm/%RH and the linearity was 0.996.
In the second part, the sensor proposed in the first part is combined with the optical fiber microprobe sensor, which is used as the composite optical fiber sensor to detect the concentration of glucose, the proposed U-shaped tilted fiber Bragg grating sensing the experimental results showed that the wavelength sensitivity was −0.282 nm/% and the linearity was 0.901. The measured standard deviation of less than 0.191 showed good repeatability measurements. In addition, this composite optical fiber sensor in the measurement process can also be the environment for temperature and humidity changes to be corrected, reducing the U-shaped optical fiber sensor measurement of glucose solution due to external environment generated by the error.
This optical fiber sensing system has high research and development value, as the TFBG can be used not only for relative humidity sensing and concentration detection, but also in temperature, strain, and magnetic field sensing applications, a versatility that suggests that its future is really limitless.
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