Roughened tapered macro-bend optical fiber ethanol gas sensor based on polypyrrole film modification

Abstract

The invention discloses a roughened tapered macro-bend optical fiber ethanol gas sensor based on a polypyrrole film modification, which relates to the field of optical fiber sensors. The sensor mainlyincludes a macro-bend optical fiber, a certain length of the macro-bend optical fiber is a tapered macro-bend structure, the tapered macro-bend structure is a residual core structure in which the fiber cladding and part of the fiber cores are removed after roughening processing, the polypyrrole film is attached to the surface of the tapered macro-bend structure to form an ethanol gas sensitive probe, the fiber part of the macro-bend optical fiber located at both ends of the tapered macro-bend structure is shielded by a black sleeve that shields external light, one end of the macro-bend optical fiber is connected with the LED light source, and the other end is connected with the optical power meter. Meanwhile, a preparation method and a detection method of the sensor are disclosed too. The detection method and the preparation method provided by the invention are relatively simple, the film shape is good, and can meet the detection requirements of arbitrary arrangement in a complex spatial structure, with simple structure and low cost.

Description

technical field [0001] The invention relates to the field of optical fiber sensors, in particular to a roughened tapered macrobend optical fiber ethanol gas sensor based on polypyrrole film modification, which is suitable for the detection of ethanol gas. Background technique [0002] In the prior art, the detection of ethanol gas generally uses consumable substances such as metal oxides as sensitive substances, and the measurement temperature is high, which is not suitable for room temperature. At the same time, the gas response time is not ideal, and the measurement gas concentration range cannot meet the actual needs, which affects the real-time testing. In addition, the existing gas sensor improves the gas response time by injecting gas into a closed space, but it is difficult to apply to the general environment due to its many constraints. Therefore, there is a need for an ethanol gas sensor that can monitor the change of the refractive index in real time and greatly i...

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Problems solved by technology

[0003] In order to solve the problem that the sensor used in the detection of ethanol gas in the prior art is not suitable for detection at normal temperature and pressure, the present invention provides a roughened tapered macrobend optical fiber ethanol gas sensor based on polypyrrole film modification

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