Spiral optical fiber sensing device based on bending deformation of optical fiber

Abstract

The invention discloses a spiral optical fiber sensing device based on the bending deformation of an optical fiber. The optical fiber has a spiral multi-ring structure, so that the effective action length of the signal optical fiber is greatly prolonged; a plurality of opposite grooves are formed between an inner cylinder and a shell outside the inner cylinder, so that the dynamic range of the optical fiber sensing device is expanded under the condition that the bending curvature deformation of the signal optical fiber is greatly reduced; and different physical quantities are sensed by selecting different materials of the inner cylinder and the shell, so that the optical fiber sensing device can be applied to more occasions. The optical fiber sensing device has a simple structure, a reasonable design, high sensitivity, long service life, a good using effect and a wide application prospect, is convenient to process and manufacture and flexible in use, and can measure various physical quantities through extension.

Description

technical field [0001] The invention relates to an optical fiber sensing device in the field of sensing technology, in particular to an optical fiber sensing device including a spiral physical quantity test based on optical fiber bending deformation distributed between an inner cylindrical body and a casing. Background technique [0002] There are many types of fiber optic sensors, but the fiber optic microbend sensor is still a very promising fiber optic sensor with low cost and high precision. The microbend sensor has been proposed for 20 to 30 years, but Due to the unreasonable structural design, this type of sensor has not been used in large quantities, and there are even few mature commercial products on the market. [0003] In "Journal of Chengdu University of Science and Technology" 1990, No. 3, total No. 51, pages 65-70, "Study on the Structure and Performance of Optical Fiber Microbending Sensors", this article introduces a helical optical fiber microbending sensor....

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Problems solved by technology

But this sensor adopts elastic body 3, when the groove of helical deformer 1 is many and small, even when there is no force, the elastic body 3 sensitive to external temperature and air pressure will follow the groove of helical deformer 1. The change of the groove causes the signal fiber 10 to bend and cause interference and errors in the test results. The easy deformation of the high elastic body 3 of the rubber sheath will limit the increase in the number of grooves and the decrease in the groove depth of the spiral deformer 1, and the groove The number of grooves and the groove depth are the key to give full play to the performance of the microbend optical fiber sensor. In addition, the high elastic body 3 of the rubber sheath has obvious defects in the service life, the uniformity of the internal density and the fine machining, which limits the Improve the accuracy of the sensor and expand the range of use

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