Optical fiber icing sensor capable of identifying ice type based on ultraviolet solar blind wave band
An optical fiber and ice-type technology, applied in the field of propagation and total reflection principles, can solve problems such as inability to accurately identify ice types, uncertainty, and increase the optical characteristics of frost ice and bright ice
Pending Publication Date: 2022-08-02
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology
[0006] The purpose of the present invention is to solve the problem that the existing optical fiber icing sensor cannot accurately identify the ice type, resulting in large error and uncertainty in the detection results, and proposes a new type of optical fiber icing sensor that uses a special discrimination optical fiber to identify the ice type. Solve the problem that all current fiber optic icing sensors cannot accurately identify ice types
[0007] The present invention proposes the use of an ultraviolet sun-blind band light source for the existing optical fiber icing sensors that generally use infrared band light sources and cannot greatly distinguish the optical characteristics of enlightened ice and frost ice and are easily affected by natural stray light, and solve the problem at the same time The problem of increasing the optical properties of frost and bright ice and eliminating the influence of natural stray light
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[0027] Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), unless expressly stated otherwise, may be replaced by alternative features of other equivalent or similar features. That is, unless expressly stated otherwise, each feature is but one example of a series of equivalent or similar features.
[0028] In this example, the optical fiber protective sleeve material is optical glass LAK3, and the optical fiber is a plastic optical fiber with an outer diameter of 1.1 mm and an inner diameter of 1 mm and the core is PMMA material.
[0029] The inclination angle of the discriminated fiber in this example is 60°.
[0030] The cylindrical LAK3 optical glass with a diameter of 6mm and a height of 5mm is punched with 4 circular holes symmetrically on a certain diameter with the bottom center as the center. The size is 60° to fit the oblique angle of the fiber.
[0031] The hole depth is 4.9mm.
[0032] Insert the discriminating o...
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Abstract
The invention discloses a novel optical fiber icing sensor with an ice type identification capability. An ultraviolet solar blind wave band is applied to the field of optical fiber icing detection for the first time. In order to explore the icing detection problem in a complex environment, the ice type identification capability of the optical fiber icing sensor is improved through innovation of an optical fiber icing sensor probe and introduction of an ultraviolet solar blind wave band on the premise that the normal performance of an icing surface is not damaged, so that the detection precision of the optical fiber icing sensor is improved. The light intensity of the ultraviolet solar blind wave band applied in the invention is almost zero in the atmosphere, and the application of the wave band not only solves the influence of natural stray light on icing detection, but also amplifies the scattering effect of frost ice, thereby greatly reducing the difficulty of signal processing, and simplifying a data processing circuit. In addition, the method can be applied to various complex and severe icing environments, and has the advantages of being good in adaptability and wide in application range.
Description
technical field [0001] The invention relates to the field of optics, in particular to the optical properties of ice in the field of optical fiber ice detection, the propagation characteristics of light in ice, the propagation of light in optical fibers and the principle of total reflection. Background technique [0002] Whether it is in the wind power industry or in the aviation field, the icing problem is the focus of industry research. The icing phenomenon not only affects the power generation efficiency of wind turbines, but also brings serious harm to the normal operation of wind turbines. Wind turbines are widely installed in severe cold areas. Taking the distribution of wind energy in my country as an example, the wind power density is greater than 500W / m 2 The areas covered are the southeast coast, Shandong Peninsula, Liaodong Peninsula, Sanbei area, and the lower reaches of the Songhua River. The above areas except the southeast coast will experience freezing conditi...
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IPC IPC(8): G01N21/552
CPCG01N21/552Y02E10/72
Inventor 李绍荣张驰肖春华吕辉岩严宏凯
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA