Quasi-distributed white light interference strain sensing system based on optical fiber full-spectrum reflectors with adjustable splitting ratios

A white light interference and strain sensing technology, which is applied in the direction of optical devices, measuring devices, instruments, etc., can solve the problems of complex production of fiber optic full-spectrum mirrors, difficulty in realizing fine control of splitting ratio, and difficulty in engineering use, etc., and achieve good results. Control, structural stability, suitable for engineering effects

Inactive Publication Date: 2011-10-19
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the full-spectrum reflector constructed in this way can divide the incident light into reflected light and transmitted light according to a certain ratio, it is difficult to achieve fine control of the splitting ratio.
Because the air gap is easily affected by ambient temperature, humidity, etc., which in turn affects its splitting ratio
The fiber optic full-spectrum reflector produced by this method has the disadvantages of complex fabrication, unstable performance, and difficult engineering use, so it has not been able to be applied in practice.

Method used

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  • Quasi-distributed white light interference strain sensing system based on optical fiber full-spectrum reflectors with adjustable splitting ratios
  • Quasi-distributed white light interference strain sensing system based on optical fiber full-spectrum reflectors with adjustable splitting ratios
  • Quasi-distributed white light interference strain sensing system based on optical fiber full-spectrum reflectors with adjustable splitting ratios

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Example 1: Deformation measurement of a single white light interference sensor based on an adjustable split ratio fiber optic full-spectrum mirror

[0035] Based on the adjustable splitting ratio fiber full-spectrum reflector: In this adjustable splitting ratio based fiber full-spectrum reflector, a fiber-optic full-spectrum reflector composed of a 2×2 fiber coupler with a splitting ratio of a:b is as follows: figure 2 shown. Because the splitting ratio of the fiber coupler is determined according to the incident fiber terminal, that is to say, the sub-terminal with the splitting ratio a is on the same side as the terminal of the incident light. That is, the incident light intensity I from terminal I A , then the light intensity obtained at the III end is aI A ; And when the same light intensity is incident from the incident terminal II end, the light intensity obtained at the IV end is aI A . In this way: when the incident light enters the 2×2 coupler from the I e...

Embodiment 2

[0046] Example 2: Distributed white light interferometry system based on fiber optic full-spectrum reflector with adjustable splitting ratio

[0047] like Figure 5 Shown: In the case of cascading multiple sensors, the length of the matching optical fiber of the fixed reference arm is equal to the longest sensing optical fiber length of the sensor, and the equal optical path of other sensors can be obtained by adjusting the length of the blank optical path of the adjustable reference arm output. The interferogram for each sensor initial type variable is shown below the figure. When the sensor experiences strain, the positions of these interferograms are as figure 1 The same principle as given the corresponding sensor type variables.

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Abstract

The invention provides a quasi-distributed white light interference strain sensing system based on optical fiber full-spectrum reflectors with adjustable splitting ratios. The quasi-distributed white light interference strain sensing system comprises a wide-spectrum light source, an optical fiber circulator, a connection optical fiber, a 2*2 optical fiber coupler, a fixed-length optical fiber part and an adjustable-length optical fiber part of a fixed reference arm, the optical fiber full-spectrum reflectors with adjustable splitting ratios, an adjustable reference arm, a self-focusing optical fiber collimating mirror, a movable mirror, a stepper motor, a photoelectric detector, a data acquiring card and a computer, wherein a guide optical fiber is an optical fiber for connecting a main part with a sensor; the length difference from the guide optical fiber to a sensing optical fiber is over certain centimeters; the sensor consists of the two optical fiber full-spectrum reflectors withadjustable splitting ratios and the sensing optical fiber; and a plurality of sensors can be cascaded to form a distributed sensor, so that multi-point distributed measurement can be realized. The quasi-distributed white light interference strain sensing system has a stable structure, high environmental suitability and high portability and is suitable for engineering; and good control over the splitting ratios of transmitted light and reflected light is realized.

Description

technical field [0001] The invention relates to a micron deformation measurement sensor, which is a quasi-distribution white light interference strain sensor based on an optical fiber full-spectrum reflector with an adjustable split ratio and a measurement system thereof. Background technique [0002] The traditional optical fiber full-spectrum reflector is a kind of chrome film or aluminum film on the front end of the cut flat optical fiber, and then it is tightly matched with another flat optical fiber end face in the same glass sleeve. The air gap formed between them is used to adjust the splitting ratio of reflected light and transmitted light, also known as splitting ratio. Although the full-spectrum reflector constructed in this way can divide the incident light into reflected light and transmitted light according to a certain ratio, it is difficult to achieve fine control of the splitting ratio. Because the air gap is easily affected by ambient temperature, humidity,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/16
Inventor 张平磊孙长森
Owner DALIAN UNIV OF TECH
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