Abstract
To improve the accuracy of the rotor temperature monitoring system using the spatial coupling method, the vibration distortion of the scanning spectra was investigated theoretically and experimentally. Vibration causes a shifted reflection peak and a narrower 3 dB bandwidth. The maximum scanning error of the FBG center wavelength plummetes, decreases slowly, and finally stabilizes with increasing g (the ratio of the coupling loss period between the collimators to the scanning spectrum time). Coordinating the vibration frequency with the demodulator scanning frequency so that the g-value is greater than 10 is the key to improving the accuracy. The scanning error increases slowly and then rapidly as the radial vibration amplitude or the shaft tilt amplitude increases. As the axial ratio of the rotor trajectory increases, the error first soars and then stabilizes when the ratio reaches 2.5. It's also been found that using the centroid peak method helps reduce errors.
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