Digital fiber grating demodulation instrument and method
A fiber grating demodulation and fiber grating technology, which is applied in the direction of using optical devices to transmit sensing components, etc., can solve the problem that wavelength demodulation cannot meet the requirements of accuracy and speed, and achieve the effect of satisfying accuracy and speed and improving accuracy and speed.
Active Publication Date: 2016-02-10
WUHAN WUTOS
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Problems solved by technology
[0005] The technical problem to be solved by the present invention is to provide a high-precision, high-speed digital fiber grating demodulation instrument for the defects in the prior art that the wavelength demodulation using the analog comparison method cannot meet the accuracy and speed requirements in practical applications
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[0033] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0034] Such as figure 1 As shown, the digital fiber grating demodulation instrument of the embodiment of the present invention includes a frequency-sweeping laser 1, a 1×N splitter 2, a fiber grating sensor array 3, a photoelectric conversion module 4, and a digital sampling and signal processing module 5, wherein:
[0035] A frequency-sweeping laser 1, whose output end is connected to a 1×N splitter 2, is used to output the frequency-sweeping laser according to the time axis data; the present invention adopts the frequency-sweeping laser 1 as the light source of the digital fiber grating demodulat...
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The invention discloses an instrument and a method for demodulating a digital fiber bragg grating. The demodulating instrument comprises a sweep frequency laser device, a 1*N branching unit, fiber bragg grating sensor arrays, a photovoltaic conversion module and a digital sampling and data processing module, wherein the sweep frequency laser device is used for outputting sweep frequency lasers according to timeline data, the 1*N branching unit is used for dividing sweep frequency lasers equally and transmitting sweep frequency lasers to N fiber bragg grating sensor arrays, fiber bragg grating sensor arrays are used for sensing changes of parameters to be tested and transmitting reflecting light paths of parameters to the photovoltaic conversion module through the 1*N branching unit, the photovoltaic conversion module is used for converting optical signals to electric signals and transmitting electric signals to the digital sampling and data processing module, and the digital sampling and data processing module is used for conducting digital sampling and filtering on electric analog signals sent by the photovoltaic conversion module, demodulating wavelength data according to filtered signals and sending out the wavelength data. By the aid of the instrument and the method, the digital demodulation of wavelengths can be achieved, the demodulating precision can be improved, and the demodulating speed can be accelerated.
Description
technical field [0001] The invention relates to the technical field of optical fiber sensors, in particular to a digital optical fiber grating demodulation instrument. Background technique [0002] With the advancement of fiber grating demodulation technology, the application range and reliability of fiber grating demodulators are constantly improving. But the end point of any technological development is often replaced by newer technologies. Fiber Bragg grating demodulation instrument based on F-P demodulation technology generally adopts the traditional demodulation method of analog comparison, which has slow speed, low precision and few samples available for analysis. Compared with the analog comparison method, the fiber grating demodulation instrument realized by digitization has obvious advantages. [0003] Multi-channel fiber grating demodulators generally use F-P cavity as the core optical device, and its demodulation principle adopts time-domain analysis method, usi...
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IPC IPC(8): G01D5/36
Inventor 宋珂董雷于本化印新达
Owner WUHAN WUTOS