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Method and device for comprehensively controlling parameters of high-adaptability optical fiber vibration sensing system

A fiber-optic vibration and sensing system technology, used in measuring devices, instruments, measuring ultrasonic/sonic/infrasonic waves, etc., can solve problems such as non-adaptive, single adjustment, and complex algorithms

Inactive Publication Date: 2015-04-29
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the existing technology, the method of improving the sensitivity and signal-to-noise ratio of the system includes designing a broadband high-sensitivity optical receiver, but its improvement ability is limited, and it is not self-adaptive; there is also the use of the average periodogram method, that is, Fu Liye transform, which analyzes and processes the characteristics of the signal in the frequency domain, the algorithm of this method is relatively complicated, and it is suitable for the environment where the measured signal persists at a certain frequency
The method to improve the dynamic measurement range of the system is to compare the amplitude or peak value of the continuous wave signal with the preset threshold, and adjust the controllable gain amplifier according to the comparison result to keep the signal range stable, but this method is only for Controllable gain amplifier single adjustment, limited adjustment range

Method used

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  • Method and device for comprehensively controlling parameters of high-adaptability optical fiber vibration sensing system
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  • Method and device for comprehensively controlling parameters of high-adaptability optical fiber vibration sensing system

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Embodiment 1

[0083] A highly adaptable optical fiber vibration sensing system parameter comprehensive control method, the light source module generates an optical signal and outputs it to the optical fiber optical path, the power of the optical signal P 0t for:

[0084] P 0t =A(I n -I th ),(n-1)T≤t

[0085] Where t is the moment, T is the cycle of overvoltage threshold rate detection, T=10us, n is the cycle number, n=1, 2, 3,..., and satisfy [] represents the rounding down function, I n is the driving current of the light source module in the nth cycle, and the driving current I of the light source module in the first cycle 1 is the initial value of the system, I 1 =100mA, I th is the threshold current of the light source module, I th =70mA, and I n >I th , A is the current conversion efficiency of the light source module, A=7W / A.

[0086] The optical fiber optical path generates an optical signal P It, and output to the optical receiver, where P It for:

[0087] P It =P...

Embodiment 2

[0123] A highly adaptable optical fiber vibration sensing system parameter comprehensive control device, comprising: a light source module 1 and a comprehensive parameter control module 7,

[0124] The output interface of the light source module 1 is connected to the optical fiber optical circuit 2, and is connected to the input interface of the optical fiber optical circuit 2, and the output interface of the optical fiber optical circuit 2 is connected to the optical receiver 3, and is connected to the optical fiber optical circuit 2. The input interface of optical receiver 3 is connected, and the output interface of described optical receiver 3 is connected with gain controllable amplifier 4, and is connected with the signal input interface of described gain controllable amplifier 4, and described gain can be The output interface of control amplifier 4 is connected with target event filtering module 5, and is connected with the input interface of described target event filter...

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Abstract

Provided are a method and device for comprehensively controlling parameters of a high-adaptability optical fiber vibration sensing system. The device comprises a light source module and a comprehensive parameter control module, an output interface of the light source module is connected with an optical fiber path, an output interface of the optical fiber path is connected with an optical receiver, an output interface of the optical receiver is connected with a gain-controllable amplifier, an output interface of the gain-controllable amplifier is connected with a target event filtering module, an output interface of the target event filtering module is connected with an analog-digital conversion module, an output interface of the analog-digital conversion is connected with the comprehensive parameter control module, a circuit control digital voltage output interface of the comprehensive parameter control module is connected with a circuit parameter adjusting module, a light source control digital voltage output interface is connected with a light source parameter adjusting module, an output interface of the circuit parameter adjusting module is connected with the gain-controllable amplifier, an output interface of the light source parameter adjusting module is connected with the light source module, two closed loops are formed by the whole device, and closed loop parameter control is achieved.

Description

technical field [0001] The invention relates to a comprehensive control method and device for parameters of a highly adaptable optical fiber vibration sensing system, and relates to the field of optical fiber sensing and signal processing. Background technique [0002] With the deepening of optical fiber and optoelectronic device technology research, optical fiber sensing technology has been developed by leaps and bounds. Due to the advantages of small size, light weight, high precision, fast response, wide dynamic range, fast response, etc., and it has good anti-electromagnetic interference, corrosion resistance and non-conductivity, fiber optic sensors are widely used in many fields. The physical quantities that can be detected include voltage, current, acceleration, flow velocity, pressure, temperature, displacement, etc. The fiber optic vibration sensor used to measure vibration signals is one of them, and it has been used in perimeter security, pipeline protection and ...

Claims

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Application Information

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IPC IPC(8): G01H9/00
Inventor 黄新锐侍海峰王广祯王烁潘超叶红亮李明铭赵澍慧孙小菡
Owner SOUTHEAST UNIV
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