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A multi-parameter identification method for tapered optical fiber

A tapered optical fiber and identification method technology, which is applied in the field of multi-parameter identification of tapered optical fiber, can solve problems such as cross-sensitivity of optical fiber sensors, and achieve the effects of reducing workload, improving data processing efficiency, and simplifying the structure

Active Publication Date: 2019-03-05
JINLING INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Aiming at the problem of the strain-temperature cross-sensitivity effect of fiber gratings in the prior art, the present invention provides a tapered optical fiber multi-parameter identification system and its method. The present invention can solve the problem of cross-sensitivity of optical fiber sensors, thereby improving the measurement accuracy of optical fiber sensors , to promote the popularization and use of fiber optic sensors

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  • A multi-parameter identification method for tapered optical fiber
  • A multi-parameter identification method for tapered optical fiber
  • A multi-parameter identification method for tapered optical fiber

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Embodiment 1

[0053] combine Figure 1-8 , a tapered optical fiber multi-parameter identification system, including a signal acquisition system, a data preprocessing system and a data processing system, the three are connected in sequence, the data processing system includes a multi-parameter identifier, and the multi-parameter identifier is controlled by a data input unit , a data processing unit and a data output unit, the data input unit, the data processing unit and the data output unit are connected in sequence, the data input unit is connected to the data preprocessing system, and the data processing unit includes a support vector regression machine calculation module. The signal acquisition system takes the change signal of the sensitive element affected by the set external environment (each order of loss peak resonant wavelength λ pm , lambda pn ) is recorded and output to the data preprocessing system, the data preprocessing system converts the signal into usable data (variation o...

Embodiment 2

[0059] Such as figure 1 As shown, a multi-parameter identification system of a tapered fiber in this embodiment is similar to Embodiment 1, the difference is that the signal acquisition system includes a light source and a tapered fiber, and the light source is located at the front end of the tapered fiber. The tapered waist part of the tapered fiber is used as a sensitive detection element, and the end of the tapered fiber is connected to the data preprocessing system, that is, the end of the tapered fiber is connected to the demodulator of the tapered fiber. Turn on the light source, and the optical signal passes through the waist part of the tapered fiber. In the wide spectral range of the tapered fiber, the guided mode propagating forward and the multi-order cladding mode propagating in the same direction generate energy coupling, thus forming multiple losses. peak, due to the influence of external environmental variables (temperature and strain), after the optical signal ...

Embodiment 3

[0063] Such as figure 2 As shown, a tapered fiber multi-parameter identification method includes the following steps:

[0064]Step 1: Construct the above-mentioned tapered fiber multi-parameter identification system;

[0065] Step 2: Place the signal acquisition system in an environment with preset variables (temperature T and strain ε), and the signal acquisition system collects signals (each loss peak resonance wavelength λ p ), and transmitted to the data preprocessing system to preprocess the signal to obtain sample data (input amount: the variation of resonance wavelength of each order loss peak Δλ pm , Δλ pn , output: temperature T and strain ε), the data preprocessing system sends the sample data to the input unit of the multi-parameter identifier;

[0066] Step 3: The input unit of the multi-parameter identifier transmits the sample data to the data processing unit, and the support vector regression machine calculation module in the data processing unit uses the su...

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Abstract

The invention discloses a multi-parameter identification system and method of a tapered fiber, belongs to the field of fiber sensors, and mainly aims at solving the technical problems that a fiber sensor manufacturing technology is complex and the measuring accuracy is hard to ensure at present. The multi-parameter identification system comprises a signal collection system, a data preprocessing system and a data processing system; the data processing system comprises an output processing unit which includes a SVR (Support Vector Regression) model; and data is collected by the signal collection system, the collected data is processed by the data preprocessing system to form sample data, and the data processing system uses the sample data and a relation model, established by a support vector machine, between input and output, inputs a measured quantity to be measured to the model, and obtains a required output value. According to the invention, variation of the resonant wavelength between two different loss peaks of the tapered fiber is detected to measure temperature and strain of the same tapered fiber at the same time, the operation steps of detection is fewer, and the cost is reduced.

Description

technical field [0001] The invention relates to the field of optical fiber sensing, in particular to a multi-parameter identification method for tapered optical fibers. Background technique [0002] With the increasing maturity of fiber grating manufacturing technology, the unique advantages of optical fiber sensing system, such as light weight, thin diameter, small volume and corrosion resistance, are gradually reflected, which is very suitable for making various detection sensors. The optical fiber sensing system has the unique advantage of perfect integration of sensing and sensing, and the change of its structure will have a great impact on the application of the sensor. Fiber Bragg grating sensors have advantages that other sensors cannot match, such as: anti-electromagnetic interference, light weight, good temperature resistance, long transmission distance, corrosion resistance, etc., so they have broad application prospects in the fields of optical fiber communication...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/353
CPCG01D5/353
Inventor 胡兴柳杨忠石朝霞王彦
Owner JINLING INST OF TECH
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