The “mode-splitting” phenomenon based on whispering gallery mode (WGM) was observed in coupling resonators, which are composed of two size-mismatched microspheres. The wavelength separation and intensity of the two splitting peaks varied with changing sized discrepancy for coupling microspheres. As the size of the first microsphere was fixed and coupled with a tapered fiber, it’s shown that the wavelength separation of two splitting peaks increased firstly and then decreased with the increasing size of the size-varied microsphere coupled to the first. The maximal wavelength separation could be achieved for identical-sized microspheres, with a minimal difference for intensity also noted. This analysis could provide better application prospects in measurement for judging similar-sized microspheres and measuring the size of microspheres.
Fiber Bragg grating (FBG) extensively employed in a variety of ways. In this paper, we designed an FBG sensor structure and introduced a novel method to determine the angle of vibration source. The performance of our sensor and the method were validated through experiments. We placed the sensor in a controlled water tank environment, utilizing a spherical object to generate vibration as the vibration source to stimulate the sensor. Through the FBG wavelength shifting data, the angle of ball was determined by the method. The results showed that the average deviation was only3 degrees, with an accuracy rate of 90%. Our finding demonstrate that this novel sensor has a better perception capability for minor vibrations and the angle determination method for the vibrating object has excellent accuracy.
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