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Triangular encapsulation method of fiber grating sensor

A technology of fiber grating and packaging method, which is applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve the problems of low sensitivity, achieve the effect of improving temperature sensitivity, increasing temperature sensitivity, and eliminating cross-sensitivity problems

Inactive Publication Date: 2013-10-02
NANCHANG HANGKONG UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Usually, the sensitivity coefficient of fiber grating to temperature is about (That is, when the temperature changes by 1 degree, the Bragg wavelength of the fiber Bragg grating changes by 0.01 nanometers), and its sensitivity is relatively low

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Embodiment Construction

[0025] If all three arms of the present invention adopt aluminum alloy (its coefficient of thermal expansion is in Nearby), using formula 4 and formula 5 to calculate the relationship between strain and temperature change, the results are as follows figure 1 As shown, the abscissa is the temperature change, the ordinate is the strain change, the continuous line is the exact result obtained according to formula 4, and the × point is the approximate result calculated by formula 5, the two are basically consistent; figure 1 It can be seen that the linear coefficient of strain and temperature of fiber grating can reach 26 , while the strain and temperature compensation coefficient of this temperature-sensitizing type currently on the market is only 16 about. The abscissa is the magnitude of the temperature change, in degrees Celsius. The longitudinal coordinate is the strain amount of the fiber grating. It can be seen from the figure that the strain change effect of the fib...

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Abstract

The invention discloses a triangular encapsulation method of a fiber grating sensor, which comprises the steps of: selecting a triangular encapsulation structure and a triangular encapsulation structure material, wherein the triangular encapsulation structure comprises a fiber grating sensor, a slide block, blockers, a rotating shaft, an arm, an arm, an arm and a peripheral encapsulation, the two ends of the fiber grating sensor are annularly adhered by an adhesive, an optical fiber part is adhered by the slide block with one smooth surface on the periphery of the fiber grating sensor, the blockers are connected on the upper surface of the slide block, the lower surface of the slide block is arranged in a ditch groove on the peripheral encapsulation, the blockers on the two ends of the fiber grating sensor are respectively connected with one ends of the arm and the arm, and the other ends of the arm and the arm are connected on a movable rotating shaft, the whole rotating shaft is fixed on one end of the arm, the other end of the arm is fixed on the peripheral encapsulation, and the arm, the arm and the fiber grating sensor form a triangular encapsulation; and the arms are made from the same material. The structure and material selection in the invention greatly improve the sensitivity of the fiber grating sensor.

Description

technical field [0001] The invention relates to a delta packaging method of a fiber grating sensor. Background technique [0002] Fiber Bragg grating is made by using the photosensitive characteristics of optical fiber. It has the advantages of small additional loss, strong anti-interference ability, light weight, compact structure, easy to form an all-fiber system with other optical fiber devices, long life, and wavelength encoding of information. Series of excellent performance. As a new type of sensor, fiber grating can realize the sensing and measurement of non-optical quantities such as pressure, stress, strain, micro-vibration, and sound. Compared with traditional sensors, it has the advantages of high temperature resistance, corrosion resistance, anti-electromagnetic interference, small size, flexibility and convenience. Fiber Bragg Grating has unique performance unmatched by other sensors in hydrophones, magnetic warnings, laser warnings, nuclear radiation warnings...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K11/32G01K11/3206
Inventor 万生鹏谢长林
Owner NANCHANG HANGKONG UNIVERSITY
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