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Package structure of optical fiber grating temperature sensor

A technology of temperature sensor and optical fiber grating, which is applied in the packaging field of fiber Bragg grating temperature sensor, can solve the problems of unbearable pressure, unsatisfactory stress shielding, acid and alkali resistance, etc.

Inactive Publication Date: 2007-05-30
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Existing fiber Bragg grating temperature sensor packages can only be used in relatively non-harsh environments, for example, the upper temperature limit is 100°C, cannot withstand pressure, cannot withstand acid and alkali, etc., and the shielding of stress is not ideal

Method used

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  • Package structure of optical fiber grating temperature sensor

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Embodiment Construction

[0027] Fig. 1 is the packaging structure of the fiber grating temperature sensor of the present invention, especially the packaging structure suitable for the downhole fiber grating temperature sensor of oil and gas, which includes: a bare fiber grating 1, a protection tube 3, a bare fiber grating that is not subjected to stress in the protection tube 3 Optical fiber grating support frame 2, hollow tube 7, tube valve part 5, protective tube plug 4 with a small hole, optical fiber ointment 9, optical fiber connector 6. The bare fiber grating 1 is pasted or welded on the upper part of the bare fiber grating support frame 2, and the bare fiber grating support frame 2 is pasted or welded on the inner wall of the protection tube 3 through its base, and the bare fiber grating support frame 2 is removed from the base and the protection tube. The inner wall of the tube 3 is in contact with the outside, and the rest is not in contact with the protection tube 3 . The transmission optica...

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Abstract

The invention relates to a capsulation structure of fibre-optical grating temperature sensor that comprises protecting tube, hollow tube, optical fibre connector, the protecting tube is tight coupled with one end of the hollow tube via tube valve element, the other end of the hollow tube is also tight coupled with the optical fibre connector via tube valve element; a bare optical fibre grating carriage is mounted in the protecting tube, it is plastered or welded to the inwall of the protecting tube via its base, the bare optical fibre grating is plastered or welded to the bare optical fibre grating carriage by glue, the transmission optical fibre is connected with the optical fibre connector via the hollow tube, other parts of the bare optical fibre grating carriage except the base are not contacted with the protecting tube, so the optical fibre grating is only under the effect of temperature, the effect of stress to the optical fibre grating is basically eliminated. The fibre-optical grating temperature sensor capsulated in this invention has high stability and reliability; it is easy to be measured in distributed system, it is not sensitive to stress, and it is effective to avoid water logging and hydrogen logging, it is fit for the formidable environment.

Description

technical field [0001] The invention relates to a packaging technology of an optical fiber Bragg grating temperature sensor, in particular to a packaging structure suitable for an optical fiber Bragg grating temperature sensor under oil and gas wells. Background technique [0002] Temperature is a very important parameter in industrial and agricultural production, so the effective monitoring of temperature has become an unavoidable problem for many industrial and agricultural production departments to carry out normal production operations. In the process of oil production, the effective, real-time, dynamic, online and distributed monitoring of the temperature of the oil production well is particularly important. Through the measurement and analysis of the temperature, the production layer dynamics of the production well can be evaluated, and the temperature profile of the well wall can be accurately measured. , and in some cases can also reflect the long-term production cha...

Claims

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Application Information

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IPC IPC(8): G01K11/32E21B47/06G01D5/353E21B47/07G01K11/3206
Inventor 肖立志陈海峰张元中付建伟赵小亮
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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