Optical fiber relative humidity sensor based on oxidized graphene film and peanut-shaped structure

Abstract

The invention discloses an optical fiber relative humidity sensor based on an oxidized graphene film and a peanut-shaped structure. The optical fiber relative humidity sensor comprises an SLED (super light-emitting diode) light source, a polarization controller, the peanut-shaped optical fiber structure, a polarization maintaining optical fiber, a fiber core staggering device, a mono-mode optical fiber, an optical fiber spectrometer, the oxidized graphene humidity-sensing film, a micro-displacement platform and a constant-temperature humidity cabinet, wherein the peanut-shaped optical fiber structure, the polarization maintaining optical fiber and the fiber core staggering device are sequentially connected to form an embedded Mach-Zehnder optical fiber interferometer. The oxidized graphene humidity-sensing film adsorbs or releases water molecules, effective refractive indexes of optical fiber surfaces are changed, and the strength of fast or slow axis light interference peaks in output spectra drifts. Therefore, current relative humidity can be measured by monitoring the strength of the fast or slow axis light interference peaks and then calculating drifting rate according to initially calibrated strength. The optical fiber relative humidity sensor has the advantages of compact structure, high sensitivity, immunity to electromagnetic interference, impurity gas interference resistance and the like, and is applicable to environmental humidity detection in actual production and life.

Description

technical field [0001] The invention belongs to the technical field of optical fiber humidity sensing, in particular to an optical fiber humidity sensor based on a graphene oxide film and a peanut-shaped structure. Background technique [0002] At present, the humidity monitoring methods are mainly based on mechanical hygrometers and electrochemical hygrometers, which have occupied a dominant position in many production fields. However, in special occasions with high temperature and high pressure, long-distance signal transmission, and complex electromagnetic signals, such as the nuclear industry and power transmission, traditional humidity sensors are prone to failure and even expose potential safety hazards. [0003] The optical fiber humidity sensor gets rid of the traditional mechanical / electrical humidity sensor framework. It innovatively uses optical fiber as the carrier to detect humidity through optical signals, so it has high sensitivity, small size, immunity to ele...

AI Technical Summary

Problems solved by technology

[0004] Early humidity-sensitive materials such as dielectrics and semiconductors have a small measurement range, serious hysteresis, and easy aging

Although the subsequent polymer materials have improved moisture absorption capacity, they are not suitable for high humidity environments

Images