Technology Of Fiber Surface Metallization And Its Influence On Temperature Sensor Properties Of The Fiber Grating

To bond the fiber and the object under test by adhesive polymer(such as epoxy) is a traditional way in fiber grating sensors. The bond strength, durability often can not meet the requirements,some time later,the bonding point may be easy to loose or even fall off, resulting in measured data instabilityand poor reproducibility. Meanwhile, the fiber core materials are made of are fragile, when used in sensing applications may be damaged due to uneven stress, tension. Fiber surface metallization can make up for these shortcomings.Domestic and foreign researchers carried out a lot of research on the silica fiber surface with metal plating and a mass of work adopted the coarse fiber pretreatment technology to prepare a continuous metal coating to enhance the coating adhesion, However, the roughed silica fiber surface will bring in light loss during practical applications. in this paper, In order to obtain high-quality metal coating, activation and sensitization of the quartz fiber and coarse fibers in acid pre-treatment process on the nickel plating uniformity and adhesion of fiber are studied. The best technology parameters are obtained by optimizing the acidic platingtechnology, a continuous, uniform, delicate, bright, good adhesion of nickel-plated were obtained without coarsening of the fiber surface.Fiber Bragg grating sensor have been widely studied because of its small size, light weight, good stability, good reproducibility, easy to fiber connection, spectral characteristics, and anti-corrosion, anti-electromagnetic interference and other characteristics, The reported fiber Bragg grating sensors can detect the physical quantities are as follows: temperature, strain, pressure, displacement, pressure, torque, acceleration, current, voltage, magneti-c field, thermal expansion coefficient, vibration and so on. fiber Bragg sensors With its superior sensing performance become a research hotspot, but the performance of fiber grating sensor itself is not ideal, so the fiber grating sensor package design for increasing sensitization has become a hot research.In this thesis, We studied the technology of fiber surface metallization and its influence on temperature Sensor Properties of the Fiber Grating.(1) The surface acid electroless nickle-plating technology on quartz fiber was studied, and the factors such as temperature,density of main component of liquid, pH, affecting the surface appearance of nickle-plating layer were investigated. In the conditions of optimized process, it has been found that it is unnecessary to coarsen fiber in the process of prehandle for continuous plating layer. The obtained nickle layer was uniform, continuous, bright, subtle and has a good adhesive force from the quartz fiber without coarsening, and the coating rate is 5.76.μm/h.(2) In this paper, at the best acidic nickel plating technology conditions of the fiber, we got the quartz fiber gratings with different plating thickness of nickel coating, and studied the influence of different thickness plating on the center wavelength of the grating, also compared the temperature of the bare grating coefficient of nickel plating grating temperature sensitivity coefficient, to some extent, the test confirmed that nickel-plated quartz fiber after reaching a certain thickniss will improve the fiber grating responsing to the environmental temperature. Metallization technology for the fiber Bragg grating provides a reference for metallization package design of fiber.