Mining fiber Bragg grating positive pressure sensor
A fiber optic Bragg and pressure sensor technology, applied in the field of sensors, can solve the problems of being susceptible to electromagnetic interference and difficult long-distance transmission of measurement signals, and achieves the effect of easy wavelength division multiplexing and simple structure
Inactive Publication Date: 2012-01-04
SHANDONG UNIV
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Problems solved by technology
[0003] 1. Susceptible to electromagnetic interference;
[0004] 2. The measurement signal is not easy to transmit over a long distance;
Method used
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[0018] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0019] like figure 1 As shown, a fiber Bragg grating negative pressure sensor for mines includes a casing 7 protecting the internal sensing element, one side of the casing 7 is open, and a metal strain film 1 that deforms under pressure is sealed in the opening, The housing 7 is provided with an elastic rod device arranged in a zigzag shape perpendicular to the metal strain film 1 as a whole. The elastic rod device includes two parallel elastic rods 3, one end of which is connected to the metal strain film 1 contact, one end of the other elastic rod 3 is fastened to the side of the housing 1 through the thread 5, and the end of the elastic rod 3 is exposed outside the housing, and the remaining two corresponding ends of the two elastic rods 3 are hinged by the lever 2, The middle part of the lever 2 is hinged on the inner wall of the housing.
[0020]...
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The invention relates to a mining fiber Bragg grating positive pressure sensor, comprising a case; wherein one side of the case is provided with an opening, the opening is internally hermitically provided with a strain film, the case is internally provided with a zigzag elastic rod device, as a whole, vertical to the strain film, one end of the elastic rod device is contacted with the strain film, the other end penetrates the side of the case and is exposed outside, an elastic rod in the case is provided with a fiber Bragg grating, the fiber Bragg grating is connected with a demodulating device outside the case by virtue of an optical fiber; the region between the opening of the case and the strain film is a positive pressure region, the rest region in the case is communicated with the outside and is a normal pressure region. The invention has the advantages that: structure is simpler, remote measurement can be realized, and an optical signal can be remotely transmitted at extremely low loss in the optical fiber. The sensor is anti-electromagnetic interference, and electric signal is not interfered by harsh electromagnetic environment in measurement site. A sensor network is easy to form, multiple probes can form the sensor network, and the same demodulating system is uniformly utilized.
Description
technical field [0001] The invention relates to a sensor, in particular to a mine fiber Bragg grating positive pressure sensor. Background technique [0002] The existing pressure sensors of mine hydraulic supports mostly adopt the structure combining metal elastic film and resistance strain gauge. Under the action of pressure, the metal elastic membrane deforms, and the deformation is finally converted into the output voltage of the bridge through the resistance strain gauge and the measuring bridge to realize the pressure measurement. Its disadvantages are: [0003] 1. Susceptible to electromagnetic interference; [0004] 2. The measurement signal is not easy to transmit over a long distance; [0005] 3. It is not easy to form a sensor network; Contents of the invention [0006] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a mine-used fiber Bragg grating positive pressure sensor with simple structur...
Claims
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IPC IPC(8): G01L11/02
Inventor 蒋奇胡德波
Owner SHANDONG UNIV