Parameters affected the splicing loss and polarization cross-coupling during fusion splicing between Polarization-Maintaining Photonic Crystal Fiber (PM-PCF) and conventional Polarization-Maintaining Fiber (PMF) were investigated. The influence of loss and polarization cross-coupling to the phase error of the fiber optical gyroscope (FOG) is calculated and tested. At last, an efficient and simple method of fusion splicing PM-PCF and PMF with a low loss of 0.65 dB in experiment is reported.
Honeycomb sandwich Composite has wide applications in manufacture, such as aircraft, automobile, rail transit, and so on, due to its special advantages. However, defects always exist in the honeycomb composite during manufacturing and in-service period, liquid ingress and debondings are the most typical defects. In this paper, according to the NDT problem for this kind of material, Pulsed thermography is applied, theoretical model of heat conduction for the defect detection under an instantaneous heat source is analyzed; Several kinds of honeycomb composite specimen is designed for the two typical defects detection; Pulsed thermography is applied on the specimens and the defects are revealed by the thermal images sequence processing. Furthermore, by analyzing the logarithmic temperature decreasing curves can distinguish different types of liquids under the skin. Results show that Pulsed thermography has advantages for the NDT of honeycomb composite.
Infrared thermography is a fast and effective non-destructive testing method, which has an increasing application in the field of Aeronautics, Astronautic, architecture and medical, et al. Most of the reports about the application of this technology are focus on the specimens of planar, pulse light is often used as the heat stimulation and a plane heat source is generated on the surface of the specimen by the using of a lampshade, however, this method is not suitable for the specimen of non-planar, such as the pipeline. Therefore, in this paper, according the NDT problem of a steel and composite pipeline specimen, ultrasonic and hot water are applied as the heat source respectively, and an IR camera is used to record the temperature varies of the surface of the specimen, defects are revealed by the thermal images sequence processing. Furthermore, the results of light pulse thermography are also shown as comparison, it is indicated that choose the right stimulation method, can get a more effective NDT results for the pipeline specimen.
Bias thermal stability of a Fiber-Optic Gyroscope using Polarization-Maintaining Photonic Crystal (PM-PCF) was studied. And the thermal sensitivity of birefringence in PM-PCF and polarization cross talking in fiber coil was measured. By using an OCDP method, the polarization cross talking causing phase error of the FOG was analyzed. The contrast experiment result of the FOGs with PM-PCF coil and PMF coil showed that using PM-PCF instead of PMF can improve the FOG’s bias thermal stability by about 50%.
Microhole collapse property of polarization maintaining photonic crystal fibers (PM-PCF) and its effect on the splice loss and polarization cross-coupling during fusion splicing were investigated. The relationship between the microhole collapse and polarization cross-coupling are analyzed through simulation and experiment. Finally their influence to the phase error of the FOG is calculated and tested.
The polarization-maintaining photonic crystal fiber’s phase sensitivity dependence on temperature was analysis. The relationship between temperature and phase of normal polarization-maintaining fiber and polarization-maintaining photonic crystal fiber was numerical analyzed and experimental tested. Furthermore, the Shupe effects in fiber optical gyroscopes with the two fibers were studied. The contrast results showed that the phase sensitivity dependence on temperature of the polarization-maintaining photonic crystal fiber is quantitatively comparable to normal panda fiber. And the Shupe errors of the gyroscopes with the two different fibers were at the same level.
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