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Optical fiber interference device and method

An optical fiber interference and working method technology, which is applied to measurement devices, uses optical devices to transmit sensing components, and converts sensor outputs, etc., can solve problems such as failure to be well resolved, redundant phase unwrapping operations, and reduced measurement bandwidth, etc. Achieve the effect of avoiding original data distortion, improving measurement stability, and improving measurement accuracy

Active Publication Date: 2020-01-03
UNIV OF ELECTRONICS SCI & TECH OF CHINA ZHONGSHAN INST
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  • Abstract
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  • Application Information

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Problems solved by technology

If the threshold value is too small, it cannot suppress the influence of noise on the phase edge jump, so that the phase information after unwrapping is significantly affected by noise; It is flatter than the change of the measured physical quantity, which is equivalent to the introduction of an additional low-pass filter, which reduces the measurement bandwidth
As an inherent problem of fiber optic interference sensors, the phase noise problem has not been well solved, especially in the fiber optic interference sensors with arctangent phase demodulation, the negative effect is more obvious

Method used

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  • Optical fiber interference device and method
  • Optical fiber interference device and method

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Embodiment 2

[0047] This embodiment discloses a working method of an optical fiber interference device using feature extraction arctangent phase unwrapping, such as Figure 4 shown, including the following steps:

[0048] Step 1: Perform four-quadrant arctangent processing on the interference signal entering the phase demodulation module to obtain the original phase data sequence P1, P2, P3...Pi...PN-2, PN-1, PN, where N is the data sequence The number of points, Pi represents the phase data value of the i-th data.

[0049] Step 2: Take (2m+1) sequentially adjacent data as a group, separate the original phase data sequence into (N-2m) groups of data, that is, group them into (P1, P2...P2m+1), (P2, P3...P2m+2)..., calculate the root mean square value Ti of each group of data, and obtain multiple groups of root mean square values, which are sequentially recorded as T1+m, T2+m...Ti-1, Ti, Ti+1...TN -m-1, TN-m.

[0050] in,

[0051] Pr represents the rth raw phase data, and the value ran...

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Abstract

The invention relates to an optical fiber interference device and method, and the device comprises a modulator connected to a laser, wherein the laser is connected to one ends of a sensing arm and a reference arm through a first coupler, the other ends of the sensing arm and the reference arm are connected to a detector through a second coupler, the sensing arm is connected with a probe, the detector is connected to a signal conditioning module that is connected to a phase demodulation module, the phase demodulation module comprises a processing module that is respectively connected to a firstmemory, a second memory and a third memory, the third memory is connected to a phase unwrapping module, and the phase unwrapping module is connected to a processing module, and is used to perform phase unwrapping on the signal phase data in the third memory and transmit the phase unwound data to the processing module. The optical fiber interference device of the invention has good measurement stability and high measurement accuracy.

Description

technical field [0001] The invention relates to the technical field of interference optical fiber sensors, in particular to an optical fiber interference device and method. Background technique [0002] When the environmental physical quantity acts on the sensing fiber of the fiber optic interference sensor, it will cause the phase change of the interference signal. By detecting the intensity change caused by the phase change of the optical signal, the relevant information of the measured physical quantity can be obtained. As an important high-sensitivity and high-precision measurement sensor, the optical fiber interference sensor has a wider range of applications. [0003] In order to avoid the influence of light source and detector low-frequency noise on the optical fiber interference signal, modulation technology is usually used to modulate the measured physical quantity to the high-frequency sideband, and then demodulation technology is used to demodulate the measured p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/353
CPCG01D5/35338
Inventor 于淼何禹潼王忠民罗政纯杨悦张耀鲁
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA ZHONGSHAN INST
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