Graphene oxide optical fiber humidity sensor

Abstract

The graphene oxide optical fiber humidity sensor comprises an incident optical fiber, a beam splitter, a modulation arm, a beam combiner and an emergent optical fiber which are connected in sequence, the incident optical fiber is used for inputting an optical signal, the beam splitter enables the optical signal entering from the incident optical fiber to be coupled into the modulation arm through the beam splitter, and the modulation arm is used for forming a transmission waveguide to screen different optical wave transmission modes; the beam combiner enables an optical signal entering from the modulation arm to be coupled into the emergent optical fiber through the beam combiner; and the emergent optical fiber is used for outputting an optical signal and transmitting the optical signal to detection equipment. According to the invention, the coreless optical fibers forming the beam splitter / combiner are subjected to corrosion removal treatment, the surface of the treated coreless optical fibers is coated with the graphene oxide film, and the splitting ratio of the beam splitter / combiner is modulated by utilizing the interaction of the graphene oxide and the surrounding environment, so that the purpose of sensing is achieved.

Description

technical field [0001] The invention provides a graphene oxide optical fiber humidity sensor, which belongs to the technical field of optical fiber sensing. Background technique [0002] Relative humidity sensing is critical and is used in a variety of fields including food processing, agricultural production, biopharmaceuticals, instrumentation, and structural health monitoring. Although traditional electrochemical relative humidity (RH) sensors have the advantages of high measurement accuracy, their applications in environments with easy corrosion, strong electromagnetic interference, and remote detection are limited. Since the advent of fiber optic sensors, it has been considered an ideal choice to overcome the shortcomings of electrochemical humidity sensors due to its compact structure, anti-electromagnetic interference, fast response time, high precision, and good stability. Nowadays, researchers have developed a variety of fiber optic sensors based on different sensi...

AI Technical Summary

Problems solved by technology

However, these sensors have certain limitations: the micro-nano fiber structure is difficult to prepare and is very fragile; the fiber FBG or FP structure is complex to manufacture; photonic crystal fiber is expensive

Due to the high price of wavelength detection equipment such as spectrometers, the cost of this type of sensor is relatively high, and its practical application is limited

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