A high-sensitivity and fast demodulation system for small changes in the comb spectrum

A high-sensitivity, demodulation system technology, applied in the field of high-sensitivity and fast demodulation systems, can solve the problems of the contradiction between measurement range and measurement speed, and it is difficult to improve at the same time, and achieves wide spectrum demodulation range, low cost, and high degree of practicality. Effect

Active Publication Date: 2019-03-22
CHINA ELECTRIC POWER RES INST +2
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Problems solved by technology

[0005] The purpose of the present invention is to provide a high-sensitivity fast demodulation system for small changes in the comb spectrum, which solves the problem that the measurement range and measurement speed in the current comb spectrum demodulation technology are contradictory and difficult to improve at the same time

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  • A high-sensitivity and fast demodulation system for small changes in the comb spectrum
  • A high-sensitivity and fast demodulation system for small changes in the comb spectrum
  • A high-sensitivity and fast demodulation system for small changes in the comb spectrum

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Embodiment 1

[0023] The invention of this example provides a high-sensitivity fast demodulation system for small changes in the comb spectrum,

[0024] as attached figure 1 As shown, the composition and related parameters of the system include a three-port circulator, a chirped grating is provided at the second port of the three-port circulator, and a long-period grating is provided at the third port of the three-port circulator and a phase modulation optical fiber sensor connected to the long-period grating; a photodetector capable of receiving optical power conversion is arranged beside the long-period grating; and the photodetector is connected to a signal processing, acquisition and display system.

[0025] ASE broadband light source: spectral range 1510-1580nm, maximum output power 30mW; chirped grating: reflected light bandpass range is 1542-1557nm, reflectivity 90%; long-period grating: transmission spectrum linear range ranges from 1542-1560nm , the transmittance is 90%; the phase...

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Abstract

The invention relates to a high-sensitivity rapid demodulation system for a small change of a comb-like spectrum. The high-sensitivity rapid demodulation system comprises a three-port circulator; a chirp grating is arranged the port II of the three-port circulator; a long-period grating and a phase modulation type fiber sensor connected with the long-period grating are arranged at the port III of the three-port circulator; and a photoelectric detector capable of receiving optical power conversion is arranged next to the long-period grating and is connected with a signal processing, collection, and display system. Therefore, a problem that a conflict between a measuring range and a measuring speed exists and the measuring range and the measuring speed can not be improved simultaneously according to the exiting comb-like spectrum demodulation technology can be solved.

Description

Technical field: [0001] The invention relates to the technical field of spectrum demodulation, and more particularly to a high-sensitivity fast demodulation system for small changes in comb spectrum. Background technique: [0002] Optical fiber sensors based on technical principles such as mode coupling, interference effects, and ring resonators are also called phase modulation optical fiber sensors. The basic principle is that the phase of the transmitted light in the optical fiber changes under the influence of the measured physical quantity, so that the spectrum output by the sensor shifts. By detecting the offset value of the output spectrum, the size of the physical quantity to be measured can be obtained. Since the output spectrum of the phase-modulated fiber optic sensor is a periodic comb-like spectrum, the fast demodulation technology to study the small changes of the comb-like spectrum is the key to realize the phase-modulated fiber optic sensor technology with hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/26
Inventor 侯经洲魏斌高超丘明
Owner CHINA ELECTRIC POWER RES INST
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