Weighing apparatus based on giant magnetostriction and chirped moire fiber grating demodulation

A technology of giant magnetostriction and giant magnetostrictive rod, which is applied in the demodulation of light, cladding optical fiber, weighing equipment using elastically deformable parts, etc. Small measurement range, complex structure and other problems, to achieve the effect of expanding the demodulation range, large magnetostrictive value, and simple production process

Inactive Publication Date: 2012-01-11
BEIJING JIAOTONG UNIV
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a weighing instrument based on giant magnetostriction and chirped fiber stack demodulation, which overcomes the problems of complex structure and high cost of the traditional fiber demodulation system, and overcomes the problems of the matched grating method. The demodulation accuracy is low, due to the limitation of the piezoelectric ceramic adjustable range and response speed, the measurement range of the sensing quantity is small and the frequency is low

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  • Weighing apparatus based on giant magnetostriction and chirped moire fiber grating demodulation
  • Weighing apparatus based on giant magnetostriction and chirped moire fiber grating demodulation
  • Weighing apparatus based on giant magnetostriction and chirped moire fiber grating demodulation

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Embodiment Construction

[0021] The present invention will be further described in conjunction with accompanying drawings.

[0022] A weighing instrument based on giant magnetostriction and chirped fiber moire demodulation, such as figure 1 . The device includes: a broadband light source 10 , a first coupler, a second coupler, a sensor head 30 , and a signal processing system 50 .

[0023] The broadband light source 10 is connected to the first port 11 of the first coupler, the second port 12 of the first coupler is connected to the sensor head 30, and the third port 13 of the first coupler is connected to the first port 21 of the second coupler , the second port 22 of the second coupler is connected to the demodulation system; the third port 23 of the second coupler is connected to the signal processing system 50 .

[0024] The demodulation system includes: optical fiber 40 , chirped fiber moire 41 , giant magnetostrictive rod 42 , solenoid 43 and power supply 44 .

[0025] It constitutes the con...

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Abstract

The invention discloses a weighing apparatus based on giant magnetostriction and chirped moire fiber grating demodulation, relating to a fiber grating sensor-based system, and suitable for detecting the weight of 1g-90g objects. A wide band light source (10) is connected with a sensing head (30) through a first coupler, the first coupler is connected with a signal processing system (50) through a second coupler, the second coupler is connected with a demodulation system, and a second port (22) of the second coupler is connected with one end of an optical fiber (40); a chirped fiber grating is written on the optical fiber (40) for two times to form a chirped moire fiber grating (41), the chirped moire fiber grating (41) is adhered on a giant magnetostriction rod (42) and arranged on the axial line in a solenoid (43) to fix the other end of the optical fiber (40); and two ends of a solenoid winding are connected with a power source (44). The invention has low cost and simple structure, the manufacturing process of the chirp fiber stacked grating is simple, and the measuring precision is + / -0.2g.

Description

technical field [0001] The invention relates to a fiber grating sensing system, which is suitable for detecting the weight of 1g-90g objects. Background technique [0002] In recent years, fiber optic sensors have been widely used in many fields. In particular, fiber grating sensing technology overcomes the shortcomings of distributed fiber sensing technology that is subject to intensity interference; it is easy to manufacture, low in cost, and has good repeatability; it has high sensitivity, wide measurement range, and simple structure. These advantages make fiber grating sensing technology widely used in geodynamics, spacecraft and shipping, civil engineering structures, power industry, medicine and chemical sensing. [0003] The sensing value of the fiber grating sensing system is mainly based on the small displacement of the wavelength, so the sensing system should have a precise wavelength detection device. The temperature and strain sensitivity of fiber gratings are ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F2/00G01G3/12G02B6/02
Inventor 裴丽李卓轩宁提纲高嵩祁春慧赵瑞峰
Owner BEIJING JIAOTONG UNIV
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