Fiber Optic Strain Sensor
An optical fiber strain sensor technology, applied in the field of strain sensors, can solve the problem that the measurement range cannot meet the measurement requirements, and achieve the effect of improving the measurement range
Active Publication Date: 2016-04-06
8TH RES INST OF CETC
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Problems solved by technology
Therefore, the measurement range of the existing fiber grating strain sensor cannot meet the measurement requirements
Method used
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[0009] The specific embodiment of the present invention is described in detail below in conjunction with accompanying drawing:
[0010] refer to figure 1 As shown, the optical fiber strain sensor of this embodiment includes a tube shell 1, and an end cap 2 is sealed and bonded to both ends of the tube shell 1 respectively. Correspondingly fixed on the two end caps 2 by bonding and pre-tensioned, a strain relief beam 4 is installed in the shell 1, and the strain relief beam 4 is bent by a strip-shaped stainless steel plate with a thickness of 0.25-0.5mm. A folded integral structure, which includes a middle fixing part 41 and two mirror-symmetric edge strain desensitizing parts 42 connected to its two sides, wherein the middle fixing part 41 is a rectangular flat-bottomed groove structure, and the two edge strain desensitizing parts The parts 42 are two mirror-symmetrical stepped structures, the middle fixing part 41 is glued and fixed on the inner wall of the package 1 , and t...
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The invention discloses an optical fiber strain sensor which comprises a pipe shell; both ends of the pipe shell are respectively provided with an end cover; an optical fiber grating is arranged in the pipe shell; both ends of the optical fiber grating are respectively and correspondingly fixed on the two end covers and are pre-tensioned; a strain desensitization beam is arranged in the pipe shell; the strain desensitization beam comprises a middle fixed part and two edge strain desensitization parts which are connected with both sides of the middle fixed part and are provided with symmetric mirror images; the middle fixed part is fixedly arranged on the inner wall of the pipe shell; the free ends of two edge strain desensitization parts are fixedly connected with an optical fiber; the length of the optical fiber grating between bonded points between the two edge strain desensitization parts and the optical fiber grating is a plurality of times of the horizontal length of the middle fixed part. According to the optical fiber strain sensor, the strain desensitization beam is adopted to well protect the optical fiber grating, and the measurement scope of the optical fiber strain sensor is expanded.
Description
technical field [0001] The invention relates to a strain sensor, in particular to an optical fiber strain sensor. Background technique [0002] Traditional strain sensors are based on strain-electricity, use electrical signals as the carrier of conversion and transmission, and use wires to transmit electrical signals. Therefore, they are easily affected by electromagnetic fields and the environment when used. If the ambient humidity is too high, it may cause a short circuit, especially It is easy to cause fire in high temperature and flammable and explosive environment. [0003] The study found that when the strain of the FBG changes, the effective refractive index and grating period of the grating will change, resulting in the change of the central wavelength of the FBG. That is, 1με) will cause a wavelength change of about 1pm. By measuring the change of the center wavelength of the fiber grating, the change of the strain can be deduced, so that a new type of fiber gratin...
Claims
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IPC IPC(8): G01B11/16
Inventor 孙兵朱涛李锦华许丹丽林峰
Owner 8TH RES INST OF CETC