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Distributed grating temperature measurement method based on two-time data fusion technology

A technology of temperature measurement and distributed optical fiber, which is applied in the direction of physical/chemical change thermometers, thermometers, measuring devices, etc., can solve the problems of inaccurate measurement results, grating sensors are susceptible to interference, etc., and achieve low hardware requirements and overcome Faults, Effects of Robustness Enhancement

Inactive Publication Date: 2012-02-15
TIANJIN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the grating sensor in the prior art is susceptible to interference and cause inaccurate measurement results, and to provide a distributed grating temperature measurement method based on two data fusion techniques

Method used

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  • Distributed grating temperature measurement method based on two-time data fusion technology
  • Distributed grating temperature measurement method based on two-time data fusion technology
  • Distributed grating temperature measurement method based on two-time data fusion technology

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Embodiment

[0028] Such as image 3 As shown, take the first road as an example, this example is to measure in a closed environment.

[0029] 1. Distributed grating temperature measurement: The light emitted from the broadband light source enters the first coupler 2 after passing through the isolator 1, and then enters the fiber Bragg grating 5 through the second coupler 3 and the third coupler 4, where the grating is affected by the temperature Affected by other factors, part of the light is reflected back to the third coupler 4, and the reflected light is divided into two identical optical signals by the fourth coupler 6, one of which passes through the hypotenuse filter 7, and the other is not processed.

[0030] 2. Photoelectric detection: the two optical signals are simultaneously detected by photodetectors 8 and 9 respectively. At this time, the signal passing through the hypotenuse filter 7 is detected by the photodetector 9 to obtain a current signal of The current signal obtain...

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Abstract

The invention provides a distributed grating temperature measurement method based on a two-time data fusion technology. The method comprises the following steps of: by using a fiber Bragg grating as a temperature measurement element, measuring a temperature value by detecting a reflection signal of the grating; performing analog-to-digital conversion on the measured temperature value, and sampling; performing first-time tail-cutting weighting data fusion on multi-channel data which is sampled by using a microprocessor, and estimating the influence of interference factors such as cross sensitivity on the measuring accuracy of the grating; replacing the maximum value and the minimum value in the original data by using a tail-cutting weighting data fusion result, and thus obtaining a group of new data; and performing second-time fusion weighting minimum mean square error fusion on the new data, and thus obtaining a fusion result which serves as a final output result. The method is simple in implementation; and by adoption of the method, the problems of difficulty in elimination of the cross sensitivity and low measurement accuracy in the conventional grating measurement are solved, and the robustness of a measurement system is improved.

Description

technical field [0001] The invention relates to the technical field of multi-sensor measurement, in particular to a grating temperature sensor measurement method and data processing technology. Background technique [0002] Grating sensors are widely used in large buildings, coal mines and oil fields because they are not affected by electromagnetic interference, have strong adaptability to corrosive environments, and are easy to embed into the measured object. Because the grating is easy to connect with the optical fiber to form a distributed sensing system, it is suitable for a wide range of environmental measurement and monitoring. Grating temperature measurement is widely used in oil pipelines, oil tanks and natural gas pipelines because of the good heat resistance of the grating and the ease of laying of the distributed grating measurement system. However, grating temperature sensing is easily affected by cross-sensitivity, that is, the grating is sensitive to temperatu...

Claims

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Application Information

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IPC IPC(8): G01K11/32G01K11/3206
Inventor 袁其平马磊明童峥嵘杨秀峰曹晔
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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