Common-path double-wavelength orthogonal phase demodulating system

A quadrature phase, demodulation system technology, applied in the use of wave/particle radiation, measuring ultrasonic/sonic/infrasonic waves, measuring devices, etc., can solve the problems of estimation error or sensitivity loss, lack of high-performance demodulation technology, etc., to achieve Effects for easy integration

Pending Publication Date: 2019-11-12
DALIAN UNIV OF TECH
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Problems solved by technology

But this method will introduce additional estimation error or sensitivity loss at the same time
So far, there is still a lack of general high-performance demodulation techniques

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  • Common-path double-wavelength orthogonal phase demodulating system
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  • Common-path double-wavelength orthogonal phase demodulating system

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Embodiment Construction

[0026] The specific implementation of the present invention will be described in detail below in conjunction with the technical solutions and accompanying drawings, but the protection scope of the present invention should not be limited thereby.

[0027] see figure 1 As shown, a common-channel dual-wavelength quadrature phase demodulation system includes a core control board 1, a fast and wide tunable laser 2, a fiber circulator 3, a dual-beam interferometric fiber sensor 4, a photodetector 5 and a signal processing unit 6. High-speed phase demodulation of dual-beam interferometric fiber optic sensors can be realized in the same optical path.

[0028] The core control board 1 is realized by FPGA, and the signal processing unit 6 is realized by computer; the FPGA control board realizes the output wavelength driving of fast and wide tunable laser 2 and the synchronous acquisition and transmission of photodetector 5 data. The FPGA implements current synchronous control and outpu...

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Abstract

The invention belongs to the technical field of optical fiber sensing and discloses a common-path double-wavelength orthogonal phase demodulating system. The system comprises a core control board, a fast widely-tunable laser, an optical fiber circulator, a double-beam interference type optical fiber sensor, a photoelectric detector and a computer. The core control board realizes output wavelengthdriving of the laser and synchronous acquisition and transmission of data of the photoelectric detector. The widely-tunable laser can achieve thenanosecond-order wavelength switching speed; two orthogonal wavelengths are sequentially output; and two orthogonal signals for phase signal extraction are generated. The common-path double-wavelength orthogonal phase demodulating system can solve the following three main problems of an existing double-wavelength phase demodulating system, the problems includepower imbalance and crosstalk caused by double optical paths, restrictions between the doublewavelengths and the cavity length, and elimination of a direct-current component of an interference fringe. The common-path double-wavelength orthogonal phase demodulating system realizes high-speedphase demodulation of any cavity length in an optical path through fast wavelength switching, and can be widely applied to the fields of high-speed vibration sensing, acoustic sensing and the like.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and uses a fast and wide tunable laser to realize dual-wavelength quadrature phase demodulation in one optical path. Background technique [0002] High-performance dynamic sensing of acoustic or vibration signals has found widespread applications, such as nondestructive testing, process control, and structural condition monitoring. Fiber optic sensor is a high-speed dynamic sensor technology with great potential due to its compact structure, high sensitivity, anti-electromagnetic interference, remote monitoring, and multiplexing capabilities. Interferometric fiber optic sensors are usually based on four basic structures: fiber Mach-Zehnder interferometer, fiber Michelson interferometer, fiber Sagnac interferometer and fiber Fabry-Perot interferometer. Among them, the extrinsic Fabry-Perot interference sensing sensor (EFPI) has been widely used due to its advantages of simple struct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H9/00
CPCG01H9/004
Inventor 荆振国彭伟刘强李昂刘悦莹黄致远张杨
Owner DALIAN UNIV OF TECH
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