A Distributed Optical Fiber Temperature Measurement Method in Complex Environment
A distributed optical fiber and complex environment technology, applied in the field of distributed optical fiber temperature measurement in a complex environment, can solve problems such as inaccuracy, and achieve the effects of ensuring accuracy, broadening the scope of application, and simplifying the process
Active Publication Date: 2019-01-18
PEGASUS QINGDAO OPTOELECTRONICS
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Problems solved by technology
When the same temperature is raised at the end of the optical fiber, the temperature values demodulated by the mathematical model are different at the beginning and end, which is not accurate enough
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[0035] The method for distributed optical fiber temperature measurement in a complex environment provided by this embodiment includes the steps of 1. calibration, 2. attenuation compensation, and 3. temperature demodulation, such as image 3 As shown, the specific steps of calibration are as follows:
[0036] (1.1) Use the distributed optical fiber sensing system to obtain the anti-Stokes signal and Stokes signal of the experimental fiber, observe the above signals, mark and record the data with melting point and signal attenuation, and record The data defined as decay point data,
[0037] (1.2) obtain the light intensity ratio of described experimental optical fiber anti-Stokes light and Stokes light, and get the logarithm with base 10 to the light intensity ratio,
[0038] (1.3) Take the attenuation point data as the segmentation point to segment the light intensity ratio data calculated by base 10 logarithmically,
[0039] (1.4) According to the segmentation information, ...
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The invention relates to a distributed optical fiber temperature measurement method in a complex environment, including methods of calibration, attenuation compensation and temperature demodulation. The calibration acquires the baseline data of the distributed optical fiber sensing system, and the attenuation compensation utilizes the baseline data to The temperature measurement environment presents an ideal state of anti-Stokes light and Stokes light ratio curves with multiple discontinuities, and the temperature demodulation uses a mathematical model to solve the actual temperature value of each point of the optical fiber. It realizes the temperature measurement of each point on the optical fiber when the optical fiber has been laid at the work site, and the quality of the optical fiber is poor and there are many fusion points, which broadens the scope of application of distributed optical fiber temperature measurement, that is, it can It can measure the temperature value of each point on the optical fiber under ideal conditions, and can also measure the temperature value of each point on the optical fiber when the optical fiber is in a complex environment.
Description
technical field [0001] The invention belongs to the technical field of optical fiber temperature measurement, and in particular relates to a distributed optical fiber temperature measurement method in a complex environment. Background technique [0002] Temperature is one of the important state parameters of all physical, chemical and biological processes, and temperature measurement plays a very important role in engineering applications and scientific research. Because the optical fiber itself is not affected by radio frequency fields and other electromagnetic radiation interference, does not generate electric sparks, and has good insulation properties, the optical fiber temperature sensing technology has become a new technology that is widely used in the field of temperature measurement, the most worthy of in-depth research, and has far-reaching significance. . [0003] The distributed optical fiber temperature sensing system can continuously measure the temperature alon...
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IPC IPC(8): G01K11/32G01K15/00G01K11/324
Inventor 王立魏茂安姜海龙
Owner PEGASUS QINGDAO OPTOELECTRONICS