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High-time-synchronization multichannel fiber bragg grating sensing system

A fiber grating and time synchronization technology, which is applied in the direction of using optical devices to transmit sensing components and measuring the force of change in optical properties of materials when they are stressed. It can solve the problems of asynchronous switching time and asynchronous measurement points. , to achieve the effect of improving reliability and high time synchronization

Active Publication Date: 2013-04-03
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Problems solved by technology

However, since the current multi-channel measurement is switched by the optical switch, the measurement of the measurement points belonging to different channels in the entire measured area will be out of sync due to the switching time of the optical switch.
In the case of more channels, the asynchronousness of each measuring point is more serious for each measurement, and for the situation where high-speed dynamic signal monitoring is required, the traditional multi-channel sensing system solution is difficult to meet the needs

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[0014] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments, but the protection scope of the present invention should not be limited thereby.

[0015] see figure 1 , figure 1 It is a structural block diagram of the high-time synchronous multi-channel FBG sensing system of the present invention, as can be seen from the figure, the high-time synchronous multi-channel FBG sensing system of the present invention consists of a broadband fluorescent source 1, a three-terminal circulator 2, and an optical splitter 3 , 1*4 optical switch group 4, fiber grating sensor group 5, sensing signal demodulation device 6 and computer 7, and its connection relationship is: the output end of the broadband fluorescent source 1 is connected to the three-terminal circulator 2 through an optical fiber The first end; the second end of the three-terminal circulator 2 is connected to the input end of the optical splitter 3 via an optical...

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Abstract

A high-time-synchronization multichannel fiber bragg grating sensing system comprises a broadband fluorescent light source, a three-terminal circulator, an optical divider, a 1*4 optical switch group, a fiber bragg grating sensor group, a sensing signal demodulating device and a computer. On the basis of the advantages of high wavelength resolution precision, high demodulating speed and the like of an existing multichannel fiber bragg grating sensing system, high time synchronization in signal acquisition and processing of each channel can be realized in multichannel multi-point sensing measurement, and moreover, the high-time-synchronization multichannel fiber bragg grating sensing system is high in reliability.

Description

technical field [0001] The invention relates to optical fiber sensing, in particular to a high-time synchronous multi-channel optical fiber grating sensing system mainly used in structural engineering applications of high-speed, high-time synchronous and multi-measuring points. Background technique [0002] Optical fiber sensing technology is a brand-new sensing technology that opens up a new path along with the development of optical fiber and optical fiber communication technology. The principle is that when the external physical parameters such as strain, temperature, and vibration change, the refractive index of the grating area and the grating spacing that affect the fiber grating will change, and then the wavelength of the reflected light will change. Obtain the change amount of the physical quantity that needs to be measured, and realize the sensing. [0003] Fiber Bragg grating sensors have been widely used in strain and temperature monitoring of building structures...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/353G01D5/38G01L1/24
Inventor 张承涛范薇陈嘉琳李国扬林尊琪
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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