Liquid temperature sensing system based on echo wall mode spherical optical microcavity

Abstract

The invention discloses a liquid temperature sensing system based on an echo wall mode spherical optical micro-cavity, and the system employs the thermo-optical sensing combination of a micro-nano optical fiber, the echo wall mode spherical optical micro-cavity and isopropanol liquid. A thermo-optical sensing path that the refractive index of the isopropanol liquid is changed due to the change ofthe measured temperature so as to change or move or drift the resonance wavelength of the resonance peak of the micro-cavity is formed, the original high-quality factor characteristic of the echo wallmode optical micro-cavity can be reserved, the temperature sensing sensitivity can be improved, and the accurate measurement of the temperature is further realized.

Description

technical field

[0001] The present invention relates to optical fiber device technology, especially a liquid temperature sensing system based on a whispering gallery mode spherical optical microcavity, through the combination of micro-nano optical fiber, whispering gallery mode spherical optical microcavity and isopropanol liquid for thermo-optic sensing, Forming a thermo-optic sensing path that changes the refractive index of the isopropanol liquid due to the change of the measured temperature, thereby causing the resonant peak of the microcavity to change or move or drift, which can not only retain the original high quality factor characteristics of the whispering gallery mode optical microcavity In addition, the sensitivity of temperature sensing can be improved, thereby realizing accurate measurement of temperature. Background technique

[0002] Whispering gallery mode optical microcavity is an optical element that confines the light field in a micron-scale space area ba...

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