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Self-referencing intensity-based polymer fiber optic displacement sensor

A displacement sensor, polymer technology, used in instruments, optical devices, measuring devices, etc., can solve problems such as fiber alignment difficulties

Active Publication Date: 2018-04-13
NANO & ADVANCED MATERIALS INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To overcome this limitation, more expensive fiber bundles need to be used, which makes the alignment of each fiber more difficult

Method used

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  • Self-referencing intensity-based polymer fiber optic displacement sensor
  • Self-referencing intensity-based polymer fiber optic displacement sensor
  • Self-referencing intensity-based polymer fiber optic displacement sensor

Examples

Experimental program
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example 1

[0016] Example 1 - Self-Referencing Adjustable Displacement Transducer Installed Below the Bridge Deck

[0017] In the present invention a self-referencing and tunable polymer fiber optic displacement sensor is provided. figure 1 A schematic diagram showing the self-referencing and tunable polymer fiber optic displacement sensor of the present invention when installed below the bridge deck of a ship for monitoring any crack opening and measuring any displacement between a specific point of the bridge. In this example, the sensor 100 comprises a beam splitter 101 comprising one inlet 101a and at least two outlets (101b, 101c) ( figure 2 ), the optical fiber in the entrance 101a also includes at least one light source, namely, an LED (104), which is coupled for transmission and is divided into at least two separate optical paths in the exit (101b, 101c), and is connected to the entrance Ratio, the ratio of light intensity in each outlet is fixed; the sensing element 102 includ...

example 2

[0023] Example 2-displacement measurement system and its measurement method

[0024] There is also provided a displacement measurement system comprising at least one sensor associated with processing means, wherein said sensor is a sensor according to the first aspect and said processing means is configured to analyze current or voltage signal.

[0025] The processing device includes a digital acquisition board.

[0026] The digital acquisition board includes multiple acquisition channels.

[0027] A displacement measurement system includes a plurality of sensors associated with the plurality of channels of the digital acquisition board.

[0028] The sensing element and the self-referencing element of the sensor are oriented along different axes.

[0029] The displacement is derived from the ratio of light intensity between a sensing element and a self-reference element measured by the displacement measurement system.

[0030] figure 2 A basic diagram of a beam splitter ...

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Abstract

The present invention provides a self-referencing and adjustable polymer fiber optic displacement sensor comprising a beam splitter, at least one sensing element and a self-referencing element, wherein each of the sensing element and the self-referencing element comprises a pair of Optical fibers and receiving components between each pair of optical fibers. One receiving component of the sensing element and the second optical fiber are displaceable along the same axis and relative to each other, while the other receiving component and the second optical fiber from the reference element are non-displaceable. The incorporation of a self-referencing element into the sensor of the present invention enables the monitoring and measurement of the crack size and overall strength of the structure without being affected by other environmental or external factors.

Description

[0001] Cross references to related patent applications [0002] This application claims priority to US Provisional Patent Application Serial No. 61 / 998,126, filed June 19, 2014, the disclosure of which is incorporated herein by reference in its entirety. technical field [0003] The present invention relates to polymer fiber optic displacement sensors incorporating self-referencing elements for measuring and monitoring the size of cracks in structures. The present invention also relates to a method of determining the size of a crack in a structure using a polymer fiber optic displacement sensor combined with a self-referencing element to eliminate environmental or external factors other than the displacement due to the crack. Background technique [0004] Optical displacement sensors utilizing optical fibers have several advantages such as light weight, small size, multiplexing, and immunity to electromagnetic interference. The latter property is of particular interest as i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/02
Inventor 尹启泰
Owner NANO & ADVANCED MATERIALS INST
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