Fibre-optical grating sensor and its wavelength demodulation method and sensor

A fiber grating and wavelength demodulation technology, which is applied in the direction of transmitting sensing components, optics, and instruments using optical devices, and can solve problems such as limiting the dynamic range of demodulation speed, low wavelength demodulation speed, and inability to adapt to high-speed dynamic signal measurement.

Inactive Publication Date: 2007-05-02
INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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Problems solved by technology

Due to the need for a large number of mathematical calculations, the spectral analysis technology has a low wavelength demodulation speed and cannot adapt to the measurement of high-speed dynamic signals; the reliability and long-term stability of the wavelength scanning technology need to be further improved because of the existence of moving parts; Balanced M-Z interferometer demodulation technology is currently only applicable

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  • Fibre-optical grating sensor and its wavelength demodulation method and sensor
  • Fibre-optical grating sensor and its wavelength demodulation method and sensor

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[0021] In order to more clearly introduce the purpose and advantages of the present invention, further description will be given below in conjunction with embodiments and drawings.

[0022] Figure 1 illustrates the structure of a chirped fiber grating sensor. It can be seen that the period of the grid structure inside the fiber core changes continuously along the fiber core axis. The chirped fiber grating can be directly exposed by using a chirped mask, or it can be realized by using an equal-period fiber grating with unequal intensity strain packaging. The chirped fiber grating can be fixed on the base material by glue or welding.

[0023] Figure 2 illustrates the use of a reference chirped fiber grating to achieve wavelength demodulation. The output light signal of the broadband light source 100 enters the fiber coupler 200 through the 2001 port, and enters the chirped fiber grating sensor 300 after exiting from the 2003 port. After being reflected by the fiber grating sensor 30...

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Abstract

A transducer of fiber optics grating is prepared as packaging chirp fiber optics grating, forming wavelength demodulation unit by one wideband optical source, two optical fiber couplers, two photoelectric detectors and one reference chirp fiber optics grating matching to transducer of fiber optics grating. The wavelength demodulating method utilizing said transducer is also disclosed.

Description

technical field [0001] The invention discloses a fiber grating sensor in a fiber grating sensing system and a wavelength demodulation method thereof, in particular a method for realizing fiber grating sensing and its wavelength demodulation by using a chirped fiber grating. Background technique [0002] Fiber Bragg grating can convert the change of external environment (such as stress, strain, vibration, temperature change, etc.) [0003] Compared with traditional electrical sensors, fiber grating sensors have significant advantages: anti-electromagnetic interference, can work normally in harsh environments; optical fiber transmission loss is small, and can be monitored at long distances; fiber gratings have stable performance and long service life; fiber gratings and Optical fiber has natural compatibility, small package size and compact structure. Due to the many advantages mentioned above, fiber grating sensing has been more and more widely used. [0004] A core problem...

Claims

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Application Information

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IPC IPC(8): G01D3/028G01D5/26G02F1/03
Inventor 张松伟刘育梁
Owner INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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