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Intensity modulation type optical fiber sensor multiplexing method

An optical fiber sensor and intensity modulation technology, applied in the direction of using optical devices to transmit sensing components, coupling of optical waveguides, etc., can solve the problems of complex and expensive manufacturing and use

Inactive Publication Date: 2009-07-01
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The system is therefore complex and expensive to manufacture and use

Method used

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  • Intensity modulation type optical fiber sensor multiplexing method
  • Intensity modulation type optical fiber sensor multiplexing method
  • Intensity modulation type optical fiber sensor multiplexing method

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Embodiment Construction

[0017] Such as figure 1 As shown, taking a group of sensors as an example, a broadband light source 1 (such as an ASE light source) enters a tunable F-P filter 3 through an isolator 2 . After being filtered by the filter, the output light is connected to the input end of the first fiber coupler 4 , and the output end of the first fiber coupler 4 is respectively connected to the photodetector 6 and the second fiber coupler 5 . The output end of the photodetector 6 is connected to a signal acquisition and processing system 9 . The two output ends of the second fiber coupler 5 are respectively connected to the input ends of the third fiber coupler 10 and the fourth fiber coupler 11 . The other input ends of the third fiber coupler 10 and the fourth fiber coupler 11 are connected to the signal acquisition and processing system 9 through photodetectors 7 and 8 . The output terminals of the third fiber coupler 10 and the fourth fiber coupler 11 are connected to the sensor group. ...

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Abstract

The invention relates to a multiplexing method of an intensity modulation optical fiber sensor. The broadband light source (1) becomes wavelength-scanning light after being passed through the tunable F-P filter (3), and one path enters the sensor array after being split by the coupler 4, the reflected light is detected by the detector (7, 8), and the other path is used as the reference light detected by detector 6. Each sensor group includes two optical fiber gratings (12, 14) with different wavelengths and an intensity modulation sensor (13), and the two optical fiber gratings are respectively connected in series at both ends of the intensity sensor. The influence of the unevenness of the light source is removed through the reference channel (6), and the change of the light intensity of the intensity sensor (13) is measured by measuring the change of the reflectivity ratio of the two fiber gratings, and the complex of the intensity sensor is realized through fiber gratings of different wavelengths. use. The invention can further realize large-scale multiplexing and arraying of the intensity modulation optical fiber sensor by increasing the number of couplers.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensors, and in particular relates to a multiplexing method of an intensity modulation optical fiber sensor and a technology for realizing the method. Background technique [0002] At present, the multiplexing technology of intensity-modulated optical fiber sensor is mainly based on optical time-domain distributed detection method based on the time-domain detection technology of backscattered light or forward scattered light loss of optical fiber. Typical representatives of time domain distribution are sensor multiplexing monitoring based on optical time domain reflectometer (OTDR) and multiplexing method based on Brillouin optical time domain reflectometer (BOTDR). The sensor based on optical time domain reflectometer (OTDR) always has a blind area when it is used, the attenuation values ​​measured from both ends of the optical fiber are different, and the resolution that can be achieved is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/353G02B6/26G02B6/34
Inventor 江毅张佛健
Owner BEIJING INSTITUTE OF TECHNOLOGYGY