Fiber Bragg grating-based extensible distributed sensing system

A technology of fiber optic Bragg and sensing systems, applied in the field of scalable distributed sensing systems, can solve the problem of expensive tunable lasers and achieve low cost effects

Inactive Publication Date: 2012-09-12
GP PHOTONICS INC
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The disadvantage of this approach is that tunable lasers are relatively expensive

Method used

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  • Fiber Bragg grating-based extensible distributed sensing system
  • Fiber Bragg grating-based extensible distributed sensing system
  • Fiber Bragg grating-based extensible distributed sensing system

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Embodiment Construction

[0033] Embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0034] figure 1A schematic diagram of a sensing device 100 comprising a fiber Bragg grating is given. The sensing device 100 includes a light source 2, an optical circulator 4 and a fiber Bragg grating 8 embedded in the optical fiber 6, the light emitted by the light source 2 outputs an optical signal 5 and an optical signal 12 through the optical circulator 4, and the fiber Bragg grating 8 outputs light signal 10. The fiber Bragg grating sensor is a kind of fiber optic sensor with the highest frequency and widest range, which can change the wavelength of the reflected light wave according to the change of ambient temperature and / or strain.

[0035] figure 2 A schematic diagram of the spectrum of the optical signal 12 output by the light source 2 is given. Generally, for a single fiber Bragg grating, since the wavelength range is within a ...

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PUM

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Abstract

The invention relates to a fiber Bragg grating-based extensible distributed sensing system. The system is technically characterized by comprising a broadband light source, an optical loop device, a plurality of fiber Bragg grating sensors with different grating periods, an extensible light-wave demultiplexing separator, an optical etalon, a plurality of light sensing signal detectors and a signal processing system, wherein the output of the broadband light source is connected to an optical fiber with a distributed fiber Bragg grating through the optical loop device; light reflected from the fiber Bragg grating is output to the input port of the extensible light-wave demultiplexing separator from a port of the optical loop device, and is output to the optical etalon through each output port of the extensible light-wave demultiplexing separator; the light sensing signal detectors receive a light beams output from the optical etalon; and the signal processing system performs real-time signal processing on each sensing signal. The system is reasonable in design; and the invention has the characteristics that the system is low in cost, high in real-time performance, easy to extend and produce and the like.

Description

technical field [0001] The invention belongs to the field of optoelectronics, in particular to an expandable distributed sensing system based on fiber Bragg gratings. Background technique [0002] Over the past two decades, developments in optoelectronics and numerous innovations in the fiber optic communications industry have dramatically reduced the price and improved quality of optical components. Optical fiber sensors have been extended from the stage of laboratory experiments to practical applications in the field, such as health monitoring applications of building structures. The optical fiber sensing system has the characteristics of anti-electromagnetic interference and moisture, corrosion resistance, light weight, etc., and it is easy to form a sensing network and transmit long-distance sensing signals. Fiber Bragg Grating (FBG) sensor is a fiber optic sensor with the highest frequency and widest application range. Such sensors change the wavelength of the light w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/26
Inventor 高培良
Owner GP PHOTONICS INC
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