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An Equal Intensity Beam Fiber Bragg Grating Metal Surface Corrosion Monitoring Device

A metal surface and optical fiber grating technology, applied in measuring devices, color/spectral characteristic measurement, material analysis through optical means, etc., can solve the problems of few monitoring methods, complicated monitoring process, inconvenient operation, etc.

Active Publication Date: 2022-06-28
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current corrosion monitoring methods can be roughly divided into two categories: electrochemical methods and non-electrochemical methods, but most of them have problems such as inconvenient operation, complicated monitoring process, long monitoring execution time, and low monitoring accuracy.
The fiber grating sensor has unique advantages such as high measurement sensitivity, light weight, anti-interference, corrosion resistance, and remote measurement. The existing fiber grating-based corrosion monitoring sensor is mainly used for steel surface corrosion and pipeline surface or internal corrosion. monitoring, but there are not many studies on the monitoring of general metal surface corrosion, and there are few general monitoring methods

Method used

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  • An Equal Intensity Beam Fiber Bragg Grating Metal Surface Corrosion Monitoring Device
  • An Equal Intensity Beam Fiber Bragg Grating Metal Surface Corrosion Monitoring Device
  • An Equal Intensity Beam Fiber Bragg Grating Metal Surface Corrosion Monitoring Device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] like figure 1 As shown, an equal-strength beam-type fiber grating metal surface corrosion monitoring device includes: a base 1, a support rod 2, a pin 3, a tension spring 6, a rotating test rod 7, a compensation grating 12 and a sensing grating two fiber Braggs Grating sensor.

[0031] A support rod 2 is inclined on the base 1, a pin hole 4 is arranged in the middle of the support rod 2, the part of the support rod 2 above the pin hole 4 is arc-shaped, and a through hole 8 is opened in the middle of the rotary test rod 7, and the rotary test rod 7 is in the middle. The length of the upper part of the through hole 8 is greater than the length of the lower part of the through hole 8 .

[0032] The rotary test rod 7 is hinged with the support rod 2 through the pin 3, the top of the rotary test rod 7 is provided with a rectangular opening hook 10 and a rectangular through hole 11, the top of the support rod 2 is provided with a draw hook 5, and one end of the tension sprin...

Embodiment 2

[0039] The difference between this embodiment and Embodiment 1 is that the thickness of the rotating test rod 7 gradually decreases above the through hole 8 , and along the length direction of the rotating test rod 7 , a shovel-shaped groove 9 is provided on the inner side of the rotating test rod 7 , the thickness of the rotary test rod 7 in the groove 9 is the same, the compensation grating 12 is pasted in the inner rectangular groove 9 of the rotary test rod 7, and the sensor grating is pasted at the corresponding position on the other side of the rotary test rod 7 .

[0040] The design of the shovel-shaped groove 9 is to solve the problem that the structure of the device is small, and it is difficult to apply force on the top of the rotating test rod 7, and the stress of the two fiber Bragg grating sensors of the compensation grating 12 and the sensing grating is approximately equal. In order to avoid chirp in the measurement range, the rotating test rod 7 of this design is ...

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Abstract

An equal-strength beam-type optical fiber grating metal surface corrosion monitoring device, which belongs to the field of optical fiber sensing technology, includes a base, a support rod is arranged obliquely on the base, a pin hole is arranged in the middle of the support rod, and the part of the support rod above the pin hole is Arc-shaped, with a through hole in the middle of the rotating test rod, the rotating test rod and the support rod are hinged by pins, the upper end of the rotating test rod and the top of the support rod are connected by a tension spring, and the lower end of the rotating test rod is in contact with the metal to be tested; the rotating test rod and the A compensation grating is pasted on the opposite side of the support rod, a sensing grating is pasted on a corresponding position on the other side of the rotating test rod, and the compensation grating and the sensing grating are connected in series. The invention can meet the long-term real-time monitoring of various metal surfaces, is easy to install, easy to replace all parts of the device, corrosion-resistant, low in cost, good in stability, adjustable in sensitivity and measuring range, can amplify the measured corrosion signal, and can Self-compensating temperature, good economic and social benefits.

Description

technical field [0001] The invention relates to optical fiber grating technology, belongs to the technical field of optical fiber sensing, and particularly relates to a device for long-term real-time monitoring of metal corrosion. Background technique [0002] With the deepening of marine development, a large number of steel structure facilities have been built at sea. Because seawater is a strong electrolyte solution containing a variety of salts, and the impact of waves, marine life and various types of floating objects on the sea surface, the marine steel structure is always subject to corrosion damage. The annual economic loss caused by corrosion in the world reaches 600 billion to 1.2 trillion US dollars, accounting for 2% to 4% of the total national product of all countries, and is 6 times the total loss of comprehensive natural disasters (ie earthquakes, typhoons, floods, etc.) . At the same time metal corrosion is a long-term process, especially when the design lif...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/39G01N21/01
CPCG01N21/39G01N21/01G01N2021/0112
Inventor 张燕君杨刘震刘强
Owner YANSHAN UNIV