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Temperature-insensitive FBG acceleration sensor and method based on strain chirp effect

An acceleration sensor and effect technology, applied in the sensor field, can solve the problems of temperature and strain cross-sensitivity, temperature insensitivity, etc., and achieve the effect of strong torsion resistance

Active Publication Date: 2020-11-03
INST OF DISASTER PREVENTION
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Problems solved by technology

[0005] In order to overcome the shortcomings of the above-mentioned prior art, the present disclosure provides a temperature-insensitive FBG acceleration sensor based on the strain chirp effect, which solves the problem of cross-sensitivity between temperature and strain of the current FBG acceleration sensor

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[0031] 应该指出,以下详细说明都是示例性的,旨在对本公开提供进一步的说明。除非另有指明,本文使用的所有技术和科学术语具有与本公开所属技术领域的普通技术人员通常理解的相同含义。

[0032] 需要注意的是,这里所使用的术语仅是为了描述具体实施方式,而非意图限制根据本公开的示例性实施方式。 As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinations thereof.

[0033] In the case of no conflict, the embodiments in the present disclosure and the features in the embodiments can be combined with each other.

[0034] 用光纤光栅加速度传感器获取建筑物结构的固有频率,是地震灾害发生前后对建筑物结构损伤鉴定和评估的重要手段。针对光纤光栅在结构健康监测时温度交叉敏感的问题,提出一种基于应变啁啾效应对温度不敏感的新型加速度传感器。研制一种M形双悬臂梁结构,将光纤光栅粘贴在梁的梯度应变区,通过施加拉伸载荷使光纤光栅产生啁啾效应,并对传感器的固有频率和反射带宽进行理论分析、优化结构参数;采用有限元软件对传感器的结构应变和模态特性进行仿真分析;制作传感器实物,对其性能进行实验测试。结果表明,该传感器的灵敏度约为256pm / g,固有频率为66Hz,实验结果与仿真分析结果吻合,反射谱带宽对温度变化不敏感,有效解决了建筑物结构健康监测中温度交叉敏感问题。

[0035] 本实施例公开了基于应变啁啾效应的温度不敏感FBG加速度传感器,将光纤...

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Abstract

The invention provides a temperature-insensitive FBG acceleration sensor and method based on a strain chirp effect. The temperature-insensitive FBG acceleration sensor comprises a mass block, an M-shaped cantilever beam, a base and a fiber bragg grating. A supporting rod is vertically fixed to one side of the base, an M-shaped cantilever beam is fixedly installed at one end of the supporting rod,and a mass block is installed at the end, away from the supporting rod, of the M-shaped cantilever beam. The M-shaped cantilever beam is composed of two symmetrical equal-strength triangles, and the fiber bragg grating is obliquely pasted to a non-uniform strain gradient area of the M-shaped cantilever beam. According to the technical scheme, the fiber bragg grating is pasted to the strain non-uniform area of the beam, the fiber bragg grating generates the chirp effect by applying the tensile load, and compared with a single cantilever beam, the sensor has high torsion resistance.

Description

technical field [0001] 本公开属于传感器技术领域,尤其涉及基于应变啁啾效应的温度不敏感FBG加速度传感器及方法。 Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] 光纤布拉格光栅(Fiber Bragg Grating,FBG)加速度传感器因其具有不受电磁干扰、灵敏度高、可远距离传输和易于集成等优点,被广泛应用于大型结构和基础设施的健康监测领域中。地震灾害对建筑物结构会造成不同程度的损伤,在地震灾害发生前后利用FBG加速度传感器获取结构的自然频率,掌握材料和结构的运行状态,对建筑物早期结构损伤的鉴定和评估具有重要意义。 [0004] Antunes等提出一种高灵敏度L型悬臂梁结构,FBG在均匀应变作用下获得600pm / g左右的高灵敏度,但由于温度变化对其影响较大,限制了其在实际工程中的应用。针对温度交叉敏感问题,Li等 [5] 提出的一种基于膜片式具有温度补偿功能的FBG加速度传感器,但灵敏度低至20.189pm / g。杨淑连等 [6] 将FBG斜粘到矩形悬臂梁的侧面,并对反射光谱进行分析,采用强度解调的方法实现传感器的加速度测量,并对温度不敏感。董新永等设计了一种直角三角形悬臂梁结构,将均匀周期FBG自调制成啁啾FBG,实现传感器对温度不敏感,但实验证明传感器反射带宽随温度仍有变化。尽管近年来FBG加速度传感器已经取得了一系列丰硕成果,然而,在实际建筑物结构健康监测时,解决温度和应变的交叉敏感问题一直是阻碍FBG加速度传感技术工程推广应用的瓶颈问题。 Contents of the invention [0005] 为克服上述现有技术的不足,本公开提供了基于应变啁啾效应的温度不敏感FBG加速度传感器,解决了目前FBG加速度传感器温度和应变交叉敏感的问题。 [0006] To achieve the above objectives, one or more embodiments ...

Claims

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Application Information

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IPC IPC(8): G01P15/03G01H9/00G01V1/18
CPCG01P15/03G01H9/004G01V1/18
Inventor 张瑞蕾唐彦东单维锋刘海军李忠李海君刘京会
Owner INST OF DISASTER PREVENTION
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