Micro-nanofiber evanescent field and electro-optical polymer-based electric field sensor

Abstract

The present invention relates to a micro-nanofiber evanescent field and electro-optical polymer-based electric field sensor, which comprises a laser light source, a single-mode fiber, an electro-optical polymer and a photoelectric detector, wherein the middle section of the single-mode fiber is stretched to be a micro-nanofiber. The laser light source is connected with the micro-nanofiber wrapped in the electro-optical polymer through the single-mode fiber. During the transmission of the light along the micro-nanofiber, a large portion of the energy is transmitted in the form of an evanescent field. The micro-nanofiber enhances the interaction of the light field interaction with external substances. The variation of the external electric field will cause the variation of the refractive index of the electro-optical polymer wrapped with the micro-nanofiber, namely the variation of the refractive index of the surrounding environment of the micro-nanofibe. The variation of the refractive index of the micro-nanofiber and the electro-optical polymer will cause the variation of the energy loss of the evanescent field. Finally, the intensity of the output light is detected by the photoelectric detector. In this way, the information of the external electric field can be obtained.

Description

technical field [0001] The invention belongs to the field of optical fiber components and optical fiber sensing, in particular to an electric field sensor based on micro-nano optical fiber evanescent field and electro-optic polymer. Background technique [0002] Electric field measurement is of great significance in many fields of scientific research and engineering technology. With the rapid development of communication technology, the harsh electromagnetic environment will directly affect the normal operation of systems and equipment, so the measurement of electric field strength plays an important role in electromagnetic compatibility. [0003] The traditional electric field measurement method shows many shortcomings in practical applications. The existing electromagnetic measurement system usually uses active metal probes, which will not only interfere with the measured electromagnetic field, but also cause the measurement signal to be interfered by electromagnetic noise...

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Problems solved by technology

[0008] The purpose of the present invention is to solve the problems of complex structure and relatively complicated manufacturing process in the prior art. The present invention combines the optical characteristics of micro-nano optical fiber evanescent field transmission and the characteristics of electro-optic polymers that change the refractive index with the change of the applied electric field, and proposes a An electric field sensor based on micro-nano optical fiber evanescent field and electro-optic polymer

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