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Time division multiplexing fiber sensor array pulse delay automatic measurement method

A fiber optic sensor and pulse delay technology, applied in the direction of the instrument, can solve the problems of low accuracy, amplitude fluctuation, cumbersome process, etc., achieve the effect of improving processing speed, improving accuracy, and overcoming reading errors

Inactive Publication Date: 2015-12-09
TSINGHUA UNIV
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  • Application Information

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Problems solved by technology

This method not only has a low accuracy rate, but also because the sensor signal is an interference signal, its amplitude will fluctuate, and the delay parameters of individual sensors cannot be obtained at certain moments, and another set of data needs to be used for measurement. very cumbersome

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  • Time division multiplexing fiber sensor array pulse delay automatic measurement method
  • Time division multiplexing fiber sensor array pulse delay automatic measurement method
  • Time division multiplexing fiber sensor array pulse delay automatic measurement method

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Embodiment Construction

[0034] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but should not be used to limit the scope of the present invention.

[0035] A pulse delay automatic measurement method of a time-division multiplexing optical fiber sensor array, such as figure 1 The method shown includes the following steps:

[0036] S1. Obtain an optical pulse that includes a positioning pulse 1 and a response pulse returned by the fiber optic sensor array, wherein the response pulse includes a pulse sequence 2, and the pulse sequence 2 includes a start pulse 3 at its start position, and a start pulse 3 at its end position The end pulse 4 of the pulse sequence and the interference pulse sequence 5 between the start position and the end position of the pulse sequence, each interference pulse in the interference pulse sequence 5 corresponds to the detection s...

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Abstract

The invention provides a time division multiplexing fiber sensor array pulse delay automatic measurement method. Starting from features of received corresponding fiber sensor array pluses, according to features and various set parameters for interference pulse sequences, delay parameters in each pulse sequence group are extracted from various parameters such as a pulse amplitude threshold, a low level signal threshold, a predetermined start pulse amplitude and a delay threshold, and through counting appearing frequencies of delay parameters in multiple pulse sequence groups, the delay parameter appearing most frequently serves as the final delay parameter. The method completely realizes automatic treatment on fiber sensor array delay parameter measurement, the method can meet delay parameter measurement in different conditions through setting of various parameters, the counting step can eliminate errors in the case of parameter measurement, and the delay parameter measurement accuracy can reach 100%.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensors, and more specifically relates to a pulse delay automatic measurement method of a time-division multiplexing optical fiber sensor array. Background technique [0002] In order to ensure the steady increase of oil field production, it is necessary to collect real-time environmental parameters of oil wells, including pressure and temperature. At the same time, in order to further exploit resources such as ultra-heavy oil, it is necessary to adopt advanced technologies such as steam-assisted gravity drainage (SAGD), among which the formation and propagation of the downhole sound field and the distribution of vibration need special attention. Therefore, in practical applications, it is necessary to arrange a large number of sensors downhole, and the optical fiber sensor array has made great progress in the fields of oil exploration and reserve monitoring because it overcomes the shortcom...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J11/00
Inventor 张敏刘飞
Owner TSINGHUA UNIV