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A demodulation system of low reflectivity external cavity optical fiber f-p interferometric sensor

A low-reflectivity, demodulation system technology, applied in the field of low-reflectivity F-P external cavity fiber F-P interferometric sensors, can solve the problems of high light energy utilization, high cost, large filter loss, etc., and achieves high demodulation accuracy, The effect of low cost and small amount of calculation

Active Publication Date: 2021-04-27
CHENGDU KAITIAN ELECTRONICS
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Problems solved by technology

This demodulation method has the advantages of high sensitivity, high light energy utilization, simple operation, wide FFP tuning range, and good system stability. It is suitable for wavelength shift detection technology in engineering applications, but the high-precision FFP filter costs Higher, and the filter loss is larger

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  • A demodulation system of low reflectivity external cavity optical fiber f-p interferometric sensor
  • A demodulation system of low reflectivity external cavity optical fiber f-p interferometric sensor
  • A demodulation system of low reflectivity external cavity optical fiber f-p interferometric sensor

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Embodiment Construction

[0016] refer to figure 1 , figure 2 . In the preferred embodiment described below, a demodulation system of a low-reflectivity external cavity fiber F-P interferometric sensor includes: a semiconductor optical amplifier SOA1, an optical isolator 2, an F-P filter 5 and a coupler 4 are sequentially connected in series The closed-loop loop is characterized in that: EFPI sensor 3 and phototransistor PD6 are respectively connected at coupler 4 two ends, and described F-P filter 5 forms demodulator through digital-to-analog converter DA7 series connection digital frequency synthesizer DDS8; In the tuner, the F-P filter 5 outputs the driving voltage to the digital frequency synthesizer DDS8 through the digital-to-analog converter DA7, so that the F-P filter 5 performs nonlinear correction of linear wavelength scanning in the C-band. According to the voltage of the F-P filter 5- The central wavelength function is derived from the scanning correction function of the F-P filter 5, an...

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Abstract

The demodulation system of a low-reflectivity external-cavity optical fiber F-P interferometric sensor disclosed by the present invention aims to provide an F-P external-cavity optical fiber F-P with accurate demodulation results, a small amount of calculation, and low cost Demodulation system for interferometric sensors. The present invention is realized through the following technical solutions: in the demodulator, according to the voltage-central wavelength function of the F-P filter, the F-P filter scanning correction function is derived, and then the DDS outputs the scanning signal according to the correction function, and the F-P filter The P filter outputs narrow-band scanning light according to the corrected function, and the narrow-band scanning light scans the EFPI sensor and the reference F-P etalon through the coupler at the same time, and the reference F-P etalon performs phase expansion on the linearized spectrum obtained by sampling according to arccosine , phase splicing is performed at ‑π and π, and linear fitting is performed after splicing into a phase line, and the cavity length of the EFPI sensor is calculated through the slope, so as to realize the demodulation of the low reflectivity FP sensor.

Description

technical field [0001] The invention relates to a low reflectivity F-P external cavity optical fiber F-P interference sensor used in the field of optical fiber sensing. Background technique [0002] In the light-transmitting fiber optic sensor, the optical fiber is only used as the light-transmitting medium to transmit the optical signal modulated by the external signal to the optical detector, extract the external signal from the light wave and perform data processing as required, that is, demodulation . The fiber optic F-P sensor is developed from the F-P interferometer, and its resonant cavity is composed of a light-guiding medium such as air or optical fiber with a specific length. The transmission loss of light in the F-P cavity is large, which has a great impact on the quality of the sensor output signal, which is not conducive to the multiplexing of the sensor. In order to make the output signal of the sensor within the long range of its working cavity have the best...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/26
Inventor 代勇波任清周力杰李翔
Owner CHENGDU KAITIAN ELECTRONICS
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