Self-adaptation gain equalization type distributed optical fiber sensing optical signal receiving method and device

A distributed optical fiber, adaptive gain technology, applied in the field of signal processing, can solve the problem of not considering the influence of disturbance signal gain equalization control and so on

Active Publication Date: 2015-05-06
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods do not take into account the influence of the disturbance signal on the gain equalization control

Method used

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  • Self-adaptation gain equalization type distributed optical fiber sensing optical signal receiving method and device
  • Self-adaptation gain equalization type distributed optical fiber sensing optical signal receiving method and device
  • Self-adaptation gain equalization type distributed optical fiber sensing optical signal receiving method and device

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Embodiment 1

[0079] The adaptive gain equalization type distributed optical fiber sensing optical signal receiving method of the present invention comprises the following steps:

[0080] 1) The preamplifier 1 amplifies the original photoelectric signal and outputs an electrical signal F in the form of the following formula i (t):

[0081] F i ( t ) = A i e - B i t + D i ( t ) e - B i t + C i

[0082] Among them, the index part is the attenuation signal of the backscattered light itself without distu...

Embodiment 2

[0121] The adaptive gain equalization type distributed optical fiber sensing optical signal receiving device of the present invention includes a preamplifier 1, a main amplifier 2, a first analog-to-digital converter 3, a data averaging module 4, a parameter extraction module 5, and a gain control curve generator 6. Subtractor 7, gain controllable operational amplifier 8, second analog-to-digital converter 9, disturbance discrimination module 12, bias extraction module 10, proportional-integral (PI) controller 11, first digital-to-analog converter 13, the second Two digital-to-analog converters 14;

[0122] The output interface of the preamplifier 1 is connected with the input interface of the main amplifier 2, and the output interface of the main amplifier 2 is connected with the input interface of the first analog-to-digital converter 3 and the non-inverting input port of the subtractor 7 simultaneously, and the input interface of the subtractor 7 The output interface is con...

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Abstract

The invention discloses a self-adaptation gain equalization type distributed optical fiber sensing optical signal receiving method and device. The self-adaptation gain equalization type distributed optical fiber sensing optical signal receiving method and device can automatically adapt to various kinds of optical fibers and various kinds of lasers, and have the disturbance distinguishing function, the influence caused by sensing information on system parameter control is eliminated, the inherent offset output by a pre-amplifier can be eliminated, slow drifting of the pre-amplifier can be compensated for, the automatic gain equalization function of a distributed optical fiber sensing system is fulfilled, the spatial dynamic range of the system is enlarged, uniformity of flexibility within the spatial range is guaranteed, and the self-adaptation gain equalization type distributed optical fiber sensing optical signal receiving method and device have high adaptability and stability.

Description

technical field [0001] The invention relates to an adaptive gain equalization type distributed optical fiber sensing optical signal receiving method and device, and relates to the technical field of optical fiber measurement and the field of signal processing. Background technique [0002] Distributed optical fiber sensing is a technology that utilizes the one-dimensional spatial continuity characteristics of optical fibers for sensing. The optical fiber is used as both a sensing element and a transmission element. It can continuously measure the environmental parameters distributed along the optical fiber along the entire length of the optical fiber, and at the same time obtain the measured spatial distribution status and time-varying information. Since the phase, intensity, and polarization state of the light propagating in the optical fiber will be affected by the physical fields around the optical fiber, such as temperature, pressure, vibration, etc., these physical quan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/353
Inventor 孙小菡潘超侍海峰叶红亮黄新锐王广祯王烁李明铭赵澍慧
Owner SOUTHEAST UNIV
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