Optical fiber as a basis for creating a sensor for measuring air flow velocity

The possibility of using telecommunication optical fiber used in fiber-optic communication lines to create a sensor for measuring the velocity of gas flows is discussed. The purpose of the article is to develop an easy–to–implement design of a fiber-optic air flow velocity sensor. The object of the study is a single-mode optical fiber G655. Various variants of fiber-optic sensors for measuring air flow velocity have been proposed, an experimental setup has been created and a methodology has been developed to study the characteristics of these sensors. A design variant of the sensor that is most sensitive to changes in air flow velocity has been determined. The range of air flow rates for which the proposed sensors can be used is estimated. It is shown that the studied sensors can be used as threshold alarms for exceeding the air flow velocity of a certain value. The results of the performed research can be used in the development and creation of information and measuring systems for determining the speed of air and gas flows, as well as in ventilation systems.

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