Phase-shifting fiber Bragg grating strain sensing system based on photoelectric oscillator

A technology of fiber optic Bragg and photoelectric oscillator, which is applied in the direction of instruments, optical devices, and measuring devices, can solve the problems of reducing the measurement range, achieve the effect of improving the demodulation signal-to-noise ratio, high resolution, and overcoming mutual constraints

Active Publication Date: 2015-07-15
INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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Problems solved by technology

However, none of these solutions can avoid the mutual restriction between resolution and measurement range, that is, the improvement of resolution will lead to the reduction of measurement range, and vice versa

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  • Phase-shifting fiber Bragg grating strain sensing system based on photoelectric oscillator
  • Phase-shifting fiber Bragg grating strain sensing system based on photoelectric oscillator
  • Phase-shifting fiber Bragg grating strain sensing system based on photoelectric oscillator

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Embodiment Construction

[0026] see figure 1 As shown, the present invention provides a kind of phase-shift fiber Bragg grating strain sensing system based on photoelectric oscillator, comprising:

[0027] A wavelength tunable laser 1, the wavelength tunable laser 1 has a single longitudinal mode output, and the wavelength tunable laser 1 is an external cavity laser, a sampling grating semiconductor laser or a fiber laser;

[0028] A polarization controller 2, the input end of the polarization controller 2 is connected to the output end of the wavelength tunable laser 1, and is used to adjust the polarization state of the output light of the wavelength tunable laser, and reduce the polarization-dependent loss in the transmission process of light;

[0029] A phase modulator 3, the optical input end of the phase modulator 3 is connected to the output end of the polarization controller 2, and is used for phase modulation of the input optical signal;

[0030] An optical circulator 4, the a end of the cir...

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Abstract

A phase-shifting fiber Bragg grating strain sensing system based on a photoelectric oscillator comprises a wave-length tunable laser; an input end of a polarization controller is connected with an output end of the wave-length tunable laser; a light input end of a phase modulator is connected with an output end of the polarization controller; an end a of an optical circulator is connected with an output end of the phase modulator; one end of a phase fiber Bragg grating pi is connected with an end b of the optical circulator; an input end of a photoelectric detector is connected with an end c of the optical circulator; an input end of a microwave power beam splitter is connected with an output end of the photoelectric detector; an input end of a microwave power amplifier is connected with a first output end of the microwave power beam splitter; an output end of the microwave power amplifier is connected with a radio frequency input end of the phase modulator; an input end of a frequency spectrograph is connected with a second output end of the microwave power beam splitter.

Description

technical field [0001] The invention belongs to the field of optical fiber sensing, in particular to a phase shift optical fiber Bragg grating strain sensing system based on a photoelectric oscillator. Background technique [0002] Optical fiber sensing is an important field of sensing technology in the 21st century, and its development directly affects the progress of many industries. Fiber Bragg grating sensor is a wavelength modulation optical fiber sensor. Its mechanism is to obtain sensing information by modulating the fiber Bragg wavelength with external physical parameters. Because of its advantages that traditional sensors do not have, such as not being affected by electromagnetic interference, good electrical insulation, small size, light weight, large transmission capacity, and wide testing range, it is favored by people. [0003] The shift of fiber Bragg wavelength caused by external physical parameters can be measured by wavelength demodulation of optical filter...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/16
Inventor 李明邓晔祝宁华李伟王礼贤刘宇
Owner INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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