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A Method of Using Lateral Force to Change the Strain of Rope and Its Application in Fiber Bragg Grating Accelerometer

一种加速度计、光纤光栅的技术，应用在使用惯性力进行加速度测量、测量加速度、速度/加速度/冲击测量等方向，能够解决没有绳应变变化的关系报道等问题

Active Publication Date: 2016-08-17
BENGBU COLLEGE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, there is no report on the relationship between lateral force and its induced rope strain change

Method used

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  • A Method of Using Lateral Force to Change the Strain of Rope and Its Application in Fiber Bragg Grating Accelerometer
  • A Method of Using Lateral Force to Change the Strain of Rope and Its Application in Fiber Bragg Grating Accelerometer
  • A Method of Using Lateral Force to Change the Strain of Rope and Its Application in Fiber Bragg Grating Accelerometer

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Embodiment Construction

[0169] To demonstrate that a lateral force applied to a rope can induce a greater axial force, consider the example of a ball fixed in the middle of a rope. In this way, it satisfies the above two cases (the case where both sides of the rope are free to move at the point where the lateral force is applied and the case where they are not). Here, the rope must not be free to move at the point where the lateral force is applied. However, even if it can move freely, the sides of the rope will not move. Because, the strain on both sides of the rope is the same.

[0170] It can be solved from two situations:

[0171] F t = 2 AE ( ϵ l + Δϵ l ) 1 - 1 ( Δϵ ...

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Abstract

When a lateral force is applied to a rope fixed at both ends, the rope bends and its strain increases to balance the lateral force. As a result, the axial force along the rope increases more than the transverse force. The present invention gives the relationship of the transverse force to the axial force it induces. By developing FBG sensors based on lateral force rather than axial force, much less force can be required to achieve the same high sensitivity. Therefore, the volume of the fiber grating accelerometer can be significantly reduced. More importantly, the lateral force-based FBG accelerometer inherently has low cross-axis sensitivity because it is more sensitive to lateral force than axial force. In order to adapt the FBG accelerometer to more applications, the simultaneous measurement of temperature and displacement can be realized by using two FBGs. The displacement change can be obtained according to the difference between the two fiber gratings; the temperature and acceleration changes can be obtained by performing low-pass and high-pass filtering on the arithmetic mean.

Description

1. Technical field: [0001] The invention relates to the change of force on the strain of the rope and its application in the fiber grating accelerometer. To make fiber grating accelerometers suitable for more applications, simultaneous measurement of temperature and displacement (which can be converted to strain or force) is included. 2. Technical background [0002] With the development of technology (for example: the emergence of fiber grating sensors), the strain change of the rope can be easily measured. Based on the change in rope strain induced by a force, the force can be calculated. [0003] The change in rope strain induced by axial force is proportional to the change in axial force. This has been widely used, at least in the field of fiber grating sensing. [0004] However, there is no report on the relationship between lateral force and its induced change in rope strain. The present invention introduces this relationship and applies it to a fiber grating accel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01P15/03
CPCG01P15/093
Inventor 李阔
Owner BENGBU COLLEGE
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