The subway is a representative form of the rail transit, and its catenary suspension system is a very important aspect to
the safety of the whole system. The safety monitoring of the subway catenary suspension system is studied in this paper.
A demonstrate model is set up in the laboratory, and some fiber Bragg grating (FBG) sensors including strain sensors
and displacement sensors were utilized in the demonstrate system. It is shown that the used sensors could indicate the
safety information of the system effectively. Especially, the designed displacement sensor that is packaged by athermal
technique can abandon the influence of the environment temperature in a certain degree. Its engineering applicability is
greatly improved.
A novel model of an optical system for surface roughness measurement is proposed, which is based on the study of the
scattering characteristic of rough surfaces and theories for intensity-modulated fiber optic sensors. The effect of the
rough surfaces and the fiber optic sensor head to the measurement model are analyzed respectively. In order to guide the
surface roughness measurement experiment, some simulation of the optical system has been done on a computer.
Though the modeling and simulation of the surface roughness measurement system are under certain assumptions and
conditions, the research results are valuable to experiment applications yet.
In order to measure inner surface roughness of small holes nondestructively, a new fiber optic sensor is researched and
developed. Firstly, a new model for surface roughness measurement is proposed, which is based on intensity-modulated
fiber optic sensors and scattering modeling of rough surfaces. Secondly, a fiber optical measurement system is designed
and set up. Under the help of new techniques, the fiber optic sensor can be miniaturized. Furthermore, the use of micro
prism makes the light turn 90 degree, so the inner side surface roughness of small holes can be measured. Thirdly, the
fiber optic sensor is gauged by standard surface roughness specimens, and a series of measurement experiments have
been done. The measurement results are compared with those obtained by TR220 Surface Roughness Instrument and
Form Talysurf Laser 635, and validity of the developed fiber optic sensor is verified. Finally, precision and influence
factors of the fiber optic sensor are analyzed.
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