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Weighting sensor with intensity demodulation chirped fiber grating

A weighing sensor and chirped grating technology, applied in the field of fiber grating sensors, to achieve the effects of low equipment cost, high weighing accuracy and good repeatability

Inactive Publication Date: 2009-09-09
CHINA JILIANG UNIV
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Problems solved by technology

This system not only solves the problem of cross-sensitivity between temperature and strain, but also has the advantages of simple system structure, low cost, fast measurement speed, high measurement accuracy, long transmission distance, and good anti-electromagnetic interference. It is very suitable for dynamic weighing of expressways. system

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  • Weighting sensor with intensity demodulation chirped fiber grating
  • Weighting sensor with intensity demodulation chirped fiber grating
  • Weighting sensor with intensity demodulation chirped fiber grating

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Embodiment Construction

[0026] The following is attached figure 1 , 2 , 3, 4 further describe the technical solution of the present invention.

[0027] The structural schematic diagram of the optical fiber chirped grating load cell of the present invention is as follows figure 1 shown. The sensor adopts a cantilever beam 1 structure, and the cantilever beam 1 is fixed on the sensor base 5 through screw holes 2 . A bearing 3 is installed at the free end of the cantilever beam, and the bearing 3 is installed on the free end of the cantilever beam 1 through a bolt 4 . The sensing fiber grating 7 is pasted on the side of the cantilever with an inclination of 5-45 degrees. Since the sensor is used for vehicle weighing, the material of the cantilever beam 1 and other components is preferably steel with a relatively large Young's modulus to prevent the fiber chirped grating 7 from being damaged due to excessive strain.

[0028] When in use, the fiber optic chirped grating load cell 9 is fixed on the fr...

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Abstract

The invention provides a weighting sensor with intensity demodulation chirped fiber grating. The sensor is insensitive to temperature variation and is mainly used in the weighing field of dynamic vehicles, which adopts a cantilever beam structure. The chirped fiber grating (7) obliquely attaches to the side surface of the cantilever beam (1); the cantilever beam (1) is fixed on a weighting base (5) by a screw through a screw hole (2); a bearing (3) is mounted at the free end of the cantilever beam (1) by a bolt (4). Through the influence of load on reflection spectrum bandwidth of the chirped fiber grating, load weight signals can be converted into changes of reflected light power of the chirped fiber grating. Signals provided by the sensor can be widely used for various dynamic weighing and charging systems such as roads, bridges and the like through remote transmission by the fiber. The sensor can reliably work for a long time in formidable outdoor environments such as dampness, waterlogging, big environmental temperature variation, strong electromagnetic interference and the like, and has high measuring accuracy and low manufacturing and maintenance costs.

Description

technical field [0001] The invention belongs to the field of optical fiber grating sensors, in particular to an intensity demodulation optical fiber Bragg grating chirp effect weighing sensor, which is especially suitable for dynamic vehicle weighing. Background technique [0002] At present, the dynamic weighing system is widely used in the weighing system of freight vehicles such as highways, mines, and ports, and plays an important role in traffic management, over-limit and overload control, and import and export supervision. Most of the vehicle dynamic weighing instruments in practical applications use electrical sensors, including: resistance strain gauges, piezoelectric sensors, capacitor strips, linear variable differential transformers, etc. Since the fixed weighing instruments are all installed in the harsh outdoor environment, they have poor reliability, are susceptible to electromagnetic interference, are afraid of moisture, and cannot transmit signals over long d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01G19/03G01D5/26
Inventor 董新永周文俊沈常宇赵春柳倪凯何少灵
Owner CHINA JILIANG UNIV
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