英语高手进 谢谢帮翻译
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发布时间：2022-04-30 18:29
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时间：2022-06-29 05:17
The optic fibre grating is a section of optic fibres, have structure that refracting rate periodicity changes in its fine core. According to the coupling theory of the mould, meet the wavelength of centre and is reflected back by the optic fibre grating (lB is the wavelength of centre of the optic fibre grating among them, T grating cycle, n fine effective refraction rate) in the center wavelength signal lB that reflect of core, with grating cycle T, fine effective refraction rate of core n have something to do , act as is it cause optic fibre grating temperature , stress is it can result in centre change of wavelength that reflect to change to measuring external. That is to say optic fibre grating reflect all centre change of wavelength reflect external world examine into change of signal. What the wavelength of the sensor is referred to is the wavelength of centre that FBG reflects the spike in the table . The wavelength of peak value changes with change of meeting an emergency and temperature. When rise or meet an emergency and increase in temperature, the wavelength of peak value of FBG sensor becomes long. If the sensor of the wavelength 1535.050nm of a peak value is heated from 25 degrees Centigrade to 35 degrees Centigrade, the wavelength of peak value of the sensor will rise to 1535.150nm (change 10pm of every degrees Centigrade ). Most FBG is inquired about and worked systematically within the range of 50nm window, from 1520nm to 1570nm.
The application optic fibre Bragg grating of the grating sensor of optic fibre is in the bridge, the fields , such as communication , architecture , machinery , medical treatment , navigation , spaceflight , mining instry ,etc. can all play an important role , so have wide application prospects . Have already made very great achievement so far in theoretical research of the optic fibre Bragg grating, the research about its practicability needs deepenning further. And to what small skew of measuring the grating Bragg wavelength of sensing, is the practical key technology that faces of grating sensor of Prague of optic fibre. This text has specially introced several kinds to demolation method of wavelength of optic fibre Bragg grating on the basis of this. In these methods, though simpler to strain the wave demolation law, it is very difficult to improve its precision of sensing further; Spectrum code / the demolation law of the proportion can obtain higher resolution ratio , but demand to use the light source of the low intensity, consider that the light energy decays at the same time , make many ways replied and has been limited with the application of technologied; Scanning the modest interferometer demolation law of Mike's ear non-equilibriumly has advantage high in precision, the information of wavelength to the sensing grating is decoded , and can detect to meeting an emergency , can improve the resolution ratio of sensing greatly with this kind of method demolation; With very harmonious optic fibre Fabry Perot a of wavelength of reflection of measuring the grating sensor of optic fibre, can change the wavelength signal into an electric signal directly , small, the price is low, the sensitivity is high, the light energy utilization ratio is high, operates simply and suitable for the advantages , such as wavelength displacement detection technique that the project use ,etc.. This application in the field of optic fibre sensing of method has a prospect very much. In the project is tested healthily, the traditional monitoring method usually adopts and install and meet an emergency the way of slice on the basis of building to monitor, met an emergencying , the technology of slice has been already quite ripe, but with the enlargement of the range of application, has exposed a lot of insufficient places too, for example: It is miscellaneous to connect up, the difficult group's network is easy to be interfered etc. electromagnetically. It is graal and ripe with sensing technology of optic fibre in recent years, the advantage of the grating sensor of optic fibre is more and more obvious. More and more projects test and begin to adopt the grating sensor of optic fibre. The advantage is as follows that the grating sensor of optic fibre compares with traditional emergency slice:
1. The grating sensor of optic fibre adopts the wavelength code, can contact a lot of sensors on an optic fibre , an easy group's network
2. It is joined that it is an optic fibre that adopts between the grating sensor of optic fibre and analytical instrument, the signal is not interfered electromagnetically .
3. The grating sensor main material of optic fibre is the quartz, suitable for using in the abominable environment of more corroding.
4. Have long performance life , can be up to more than 15 years.
