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Liquid density sensor system based on microwave photon technology

A liquid density, microwave photon technology, applied in the field of photoelectric sensing, can solve the problems of difficult sensing detection resolution, limited minimum resolution, etc., and achieve the effect of high-precision liquid density measurement

Pending Publication Date: 2019-05-03
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] At present, fiber optic sensing technology is widely used in industrial detection, bridge monitoring and track monitoring and other fields. Compared with electrical sensors, fiber optic sensors have the advantages of high sensitivity and immunity to electromagnetic interference; With the progress, the sensitivity requirements of the optical fiber sensing system are getting higher and higher, such as the application of ocean monitoring, the measurement of high-sensitivity physical and biochemical parameters, etc., the traditional optical fiber sensing demodulation is limited by the minimum resolution of the spectrometer (minimum 0.01nm) , it is difficult to achieve higher sensing detection resolution, and the combination of microwave photon technology and optical fiber sensing technology can realize the demodulation of optical signals and convert them to the identification and processing of microwave signals, which greatly improves the optical fiber Resolution of the Sensing System

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  • Liquid density sensor system based on microwave photon technology
  • Liquid density sensor system based on microwave photon technology
  • Liquid density sensor system based on microwave photon technology

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Embodiment 1

[0059] The specific system structure of the embodiment of the present invention is as follows figure 1 Shown:

[0060] The liquid density sensor system based on microwave photonic technology of this embodiment includes: laser 1, electro-optic modulator 2, radio frequency signal source 3, filter 4, optical switch 5, signal demodulation unit 19, first-stage Sagnac loop, Secondary Sagnac ring, isolator 10 and photodetector 18;

[0061] The first coupler 11 and the optical switch 5 include a first port 501, a second port 502, and a third port.

[0062] The signal demodulation unit 19 in this embodiment can control the conduction of the first port 501 and the first port 502 of the optical switch 5 to realize liquid density measurement using a single loop, that is, a sensing loop. The signal demodulation unit 19 can control the conduction of the first port 501 and the third port 503 of the optical switch 5 to realize the measurement of the liquid density using a double loop such as a vern...

Embodiment 2

[0081] The liquid density sensor system of this embodiment includes: an electro-optical modulator 2; the output light of the laser 1 is sent to the electro-optical modulator 2, and the optical signal in the electro-optical modulator 2 is modulated by the microwave signal emitted from the microwave signal source 3. Then output the optical signal containing the double-sideband. The optical signal passes through the filter 4 (which can be an optical filter) to filter out the unwanted sideband signals on one side, and retain the sideband signals needed on the other side, and then output to the optical switch 5; The optical switch can be set with single ring or double ring structure;

[0082] In the single-ring structure, only the Sagnac ring corresponding to the sensing component works; in the double-ring structure, the Sagnac ring corresponding to the sensing component (the second-level Sagnac ring) and the Sagnac ring (the first-level Sagnac ring) where the reference unit is located...

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Abstract

The invention discloses a liquid density sensor system based on a microwave photon technology. According to the system, a laser device emits laser and inputs the laser into an electrooptical modulator; the electrooptical modulator receives a microwave signal emitted by a radio frequency signal source and modulates the inputted laser; after a generated modulated light signal passes through a filter, the light signal after modulation and filtering enters a first-order Sagnac ring through a first port and a third port in conduction in an optical switch; the light signal after the interference ofthe first-order Sagnac ring enters a second-order Sagnac ring through an isolator; the light signal after the interference of the second-order Sagnac ring is converted into an electrical signal by a photoelectric detector and the electrical is sent to a signal demodulating unit; and the signal demodulating unit demodulates the electrical signal according to a synchronous radio frequency signal sent by the radio frequency signal source and the demodulated signal is outputted. The part of structure of the second-order Sagnac ring is arranged in a detected object. A vernier effect is generated based on the double-ring structure of the system; and the detected liquid density can be checked precisely, so that the detection precision is improved.

Description

Technical field [0001] The invention belongs to photoelectric sensing technology, and specifically relates to a liquid density sensor system based on microwave photon technology. Background technique [0002] At present, optical fiber sensing technology is widely used in industrial detection, bridge monitoring, track monitoring and other fields. Compared with electrical sensors, optical fiber sensors have the advantages of high sensitivity and immunity to electromagnetic interference; but with the promotion of applications and technological development With progress, the sensitivity requirements for optical fiber sensing systems are getting higher and higher, such as being used in marine monitoring, high-sensitivity physical and biochemical parameter measurement, etc. The traditional optical fiber sensing demodulation is limited by the minimum resolution of the spectrometer (minimum 0.01nm) , It is difficult to achieve higher sensing detection resolution, and the combination of m...

Claims

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Application Information

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IPC IPC(8): G01N9/24
Inventor 邵理阳肖冬瑞顾国强宋章启陈晓龙潘权张伟刘言军
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA