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A method to utilize string-strain-change induced by a transverse force and its application in fiber bragg grating accelerometers

A fiber grating and accelerometer technology, applied in the direction of acceleration measurement, acceleration measurement, velocity/acceleration/impact measurement, etc. using inertial force, can solve the problem of no relationship reporting of rope strain changes, etc.

Active Publication Date: 2014-02-05
BENGBU COLLEGE
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  • 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 to utilize string-strain-change induced by a transverse force and its application in fiber bragg grating accelerometers
  • A method to utilize string-strain-change induced by a transverse force and its application in fiber bragg grating accelerometers
  • A method to utilize string-strain-change induced by a transverse force and its application in fiber bragg grating accelerometers

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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

Abstract When a transverse force is applied to a stretched string that is fixed by its two ends, the string bends and the strain of the string increases to balance the transverse force. As a result, the axial force along the string can increase much more than the transverse force applied. By developing Fiber Bragg Grating (FBG) accelerometer based on transverse force rather than axial force, the force required for maintaining a high sensitivity is much smaller and thus the size of FBG accelerometers can be dramatically reduced. More importantly, FBG accelerometers based on transverse force have an inherent low cross-axial sensitivity. Simultaneous measurement of acceleration, temperature and displacement is realized by using two under-tensioned FBG. Displacement change is calculated by using the differential of the two FBG results. Meanwhile temperature and acceleration is calculated by using the arithmetic mean of two FBG results, while temperature and acceleration are distinguished by applying low frequency-pass and high-frequency-pass filter respectively to the arithmetic mean. 3a x 2Fj +AFI 2 1F, +AF, C' F, Fig. 1 a b 3b Fig. 2

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 Applications(China)
IPC IPC(8): G01P15/03
CPCG01P15/093
Inventor 李阔
Owner BENGBU COLLEGE
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