CN102519384A - Device for detecting blade strain on line based on optical fiber grating - Google Patents
Device for detecting blade strain on line based on optical fiber grating Download PDFInfo
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- CN102519384A CN102519384A CN2011104471999A CN201110447199A CN102519384A CN 102519384 A CN102519384 A CN 102519384A CN 2011104471999 A CN2011104471999 A CN 2011104471999A CN 201110447199 A CN201110447199 A CN 201110447199A CN 102519384 A CN102519384 A CN 102519384A
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Abstract
The invention relates to a device for detecting fan strain on line based on an optical fiber grating, and belongs to the field of fan blade detection in the wind power generation industry. The device comprises a broad band light source, a circulator, an optical fiber grating strain sensor, an optical fiber grating demodulation module, a data processing module, a warner, a sliding ring, a ground receiving module and a displayer. According to the device, the strain quantity of a blade can be acquired by demodulating and calculating the variation quantity of a central wavelength of the optical fiber grating according to the linear relation between the variation of the central wavelength of the optical fiber grating and the variation of the blade strain, so that real-time and on-line detection can be realized. The device can be used for detecting the strain of a plurality of points of the fan blade in real time on line by using a wavelength division multiplexing technology and has the characteristics of small volume, capacity of marking wavelengths, on-line detection, long-term stability and the like, and is not interfered with electromagnetism.
Description
Technical field
The present invention relates to the fan blade detection range in the wind-power electricity generation industry, particularly a kind of based on the strain on-line measuring device of bragg grating (FBG) strain transducer under the fan blade running status.
Background technology
Continuous development along with society constantly increases demands for energy, and especially electricity needs has been the indispensable resources of all trades and professions.Wind energy has obtained very big development as a kind of important cleaning, the reproducible energy all over the world, and till the first half of the year in 2011, China's wind-powered electricity generation machine kludge total amount reaches the first in the world.
Blade is as the main composition part of aerogenerator; Its status monitoring is extremely important; Can the quality of blade state be directly connected to blower fan and normally move, and blade distortion in various degree can occur at the wind-engaging state at present, if be out of shape the damage that conference causes blade.In addition, the generating efficiency of blower fan and blade state have direct relation, and only when the wind surface that guarantees blade remained on maximum, it is the highest that generating efficiency can reach.But present various condition restriction, traditional electronics foil gauge long-time stability are poor, are struck by lightning easily when being in running status, are difficult to realize on-line monitoring.
Fiber grating is a kind of optical passive component, normally adopts ultraviolet ray irradiation optical fiber, changes its refractive index and processes.Fiber grating have volume little, not charged, do not receive characteristics such as electromagnetic interference (EMI), corrosion-resistant, long-term stability, adopt the wavelength mark, be prone to carry out wavelength-division multiplex, can realize quasi-distributed measurement.When fiber Bragg grating strain sensor was received stress, wavelength will change, and the variable quantity of wavelength change amount and stress is proportional, can calculate the dependent variable of blade through the wavelength change of detection fiber grating strain transducer.
Summary of the invention
Technical matters to be solved by this invention provides a kind of based on the strain on-line measuring device of bragg grating (FBG) strain transducer under the fan blade running status.
The technical scheme that the present invention solves the problems of the technologies described above is following: a kind of blade strain on-line measuring device based on fiber grating comprises wideband light source, circulator; A fiber Bragg grating strain sensor; Convert light signal the fiber grating demodulation module of electric signal to, electrical signal conversion is become the signal processing module of dependent variable information, slip ring; The ground receiver module
The output terminal of said wideband light source is connected through optical fiber with the input end of circulator; The output terminal of said circulator is connected through optical fiber with the input end of fiber Bragg grating strain sensor, and the return terminal of circulator is connected through optical fiber with the input end of fiber grating demodulation module;
The output terminal of said fiber grating demodulation module is connected with the input end of signal processing module through lead, is used for sending the electric signal that has the fiber optic hub wavelength information to signal processing module;
The output terminal of said signal processing module is connected with the input end of slip ring through lead, and the output terminal of said slip ring is connected with the input end of ground receiver module, is used for sending the electric signal that carries dependent variable information to the ground receiver module.
The invention has the beneficial effects as follows: this blade on-line measuring device does not receive electromagnetic interference (EMI); Adopt Wavelength-encoding, long-time stability are high, can realize that the real-time online of blade strain detects; Can realize showing the real-time strain regime of observation blade through ground; Use wavelength-division multiplex technique, a plurality of fiber Bragg grating strain sensors detect simultaneously, can realize quasi-distributed measurement.
On the basis of technique scheme, the present invention can also do following improvement.
Further, described a kind of blower fan strain on-line measuring device based on fiber grating also includes alarm, and said alarm is connected with the output terminal of signal processing module.
Further, the output terminal of said ground receiver module also is provided with display, and the input end of said display is connected with the output terminal of ground receiver module.
Further, described a kind of blower fan strain on-line measuring device based on fiber grating, the spectral width scope of said wideband light source is between 20nm to 80nm.
Further; Said wideband light source, circulator, signal processing module and alarm are formed an installed module and are fixed; Ground receiver module and installed module of display composition are fixed, and the slip ring independent installation is fixed, and the fiber Bragg grating strain sensor independent installation is fixed.
Further, the quantity of described fiber Bragg grating strain sensor equals the merchant of wideband light source spectral width divided by the single-sensor spectral width, when the result is decimal, keeps integral part, the fractions omitted part.
Further, when the quantity of said fiber Bragg grating strain sensor during more than or equal to two, the connected mode between the said fiber Bragg grating strain sensor is:
Head and the tail are connected in series between the said fiber Bragg grating strain sensor;
Perhaps; Also comprise a shunt; Said shunt output terminal quantity is more than or equal to the quantity of fiber Bragg grating strain sensor; The input end of said shunt is connected with the output terminal of said circulator, and the input end of each fiber Bragg grating strain sensor all is connected with an output terminal of shunt.
The beneficial effect that adopts above-mentioned further scheme is to adopt optical fiber sensing technology; With the optical passive component fiber grating as strain transducer; This sensor have volume little, do not receive characteristics such as electromagnetic interference (EMI), wavelength mark, long-term stability, the wavelength change that changes into the strain of blade on grating is measured.Compare with traditional resistance strain gage, can realize multimetering, on-line measurement, antijamming capability is strong.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is fiber Bragg grating strain sensor of the present invention synoptic diagram after adopting wavelength-division multiplex;
Fig. 3 is a fiber-optic grating sensor wavelength-division multiplex synoptic diagram of the present invention;
In the accompanying drawing, the list of parts of each label representative is following:
1, wideband light source, 2, circulator, 3, fiber Bragg grating strain sensor, 4, the fiber grating demodulation module, 5, signal processing module, 6, alarm, 7, slip ring, 8, the ground receiver module, 9, display.
Embodiment
Below in conjunction with accompanying drawing principle of the present invention and characteristic are described, institute gives an actual example and only is used to explain the present invention, is not to be used to limit scope of the present invention.
Embodiment 1
As shown in Figure 1, a kind of blower fan strain on-line measuring device based on fiber grating comprises wideband light source 1; Circulator 2, fiber Bragg grating strain sensor 3 converts light signal to the fiber grating demodulation module 4 of electric signal; Electrical signal conversion is become the signal processing module 5 of dependent variable information; Slip ring 7, ground receiver module 8, the output terminal of wideband light source 1 is connected through optical fiber with the input end of circulator 2; The output terminal of said circulator 2 is connected through optical fiber with the input end of fiber Bragg grating strain sensor 3, and the return terminal of circulator 2 is connected through optical fiber with the input end of fiber grating demodulation module 4;
The output terminal of fiber grating demodulation module 4 is connected with the input end of signal processing module 5 through lead, is used for sending the electric signal that has the fiber optic hub wavelength information to signal processing module 5;
The output terminal of signal processing module 5 is connected with the input end of slip ring 6 through lead, and the output terminal of said slip ring 6 is connected with the input end of ground receiver module 8, is used for sending the electric signal that carries dependent variable information to ground receiver module 8.
Output terminal at said signal processing module 5 also is provided with alarm 6; Said alarm 6 input ends are connected with the output terminal of signal processing module 5, and the alarm equipment alarm form is not limited to the output of relay dry contact, electric current output, voice output, wireless transmission or the like.
The output terminal of said ground receiver module 8 also is provided with display 9; The input end of said display 9 is connected with the output terminal of ground receiver module; Show the dependent variable of detection position on the blade through display 9, realize that real-time online detects in the blade operational process.
Fiber grating demodulation module 4 has photoelectric converting function, can change the spectrum of fiber grating into electric signal, and send to data processing module.
Signal processing module 5 has fiber grating, wavelength and the strain information translation function of calculating; Have data processing and comparing function; Can send alarm command in dependent variable during greater than setting value, setting value is that the blade of fan blade producer regulation allows the largest deformation value.
Ground receiver module 8 is collected all information that signal processing module sends, and can the local analysis storage.
Embodiment 2
As shown in Figure 2, embodiment 2 is to comprise 3 fiber Bragg grating strain sensors 3 with the difference of embodiment 1.The quantity of fiber Bragg grating strain sensor 3 equals the merchant of wideband light source 1 spectral width divided by the single-sensor spectral width, when the result is decimal, keeps integral part, the fractions omitted part.Three grating fibers strain transducer 3 head and the tail are connected in series successively, adopt wavelength-division multiplex technique, and are as shown in Figure 3, and a plurality of check points of blade are measured, and realize the quasi-distributed measurement of blade strain; Perhaps connect through shunt; The input end of shunt is connected with the output terminal of circulator 2; The input end of each fiber Bragg grating strain sensor 3 all is connected with an output terminal of shunt; The broadband light that wideband light source 1 sends sends fiber Bragg grating strain sensor 3 to, through sending the output terminal of circulator 2 after fiber Bragg grating strain sensor 3 internal reflections to.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. the blower fan strain on-line measuring device based on fiber grating is characterized in that: comprise wideband light source, circulator; Fiber Bragg grating strain sensor; Convert spectrum the fiber grating demodulation module of wavelength electric signal to, the wavelength electrical signal conversion is become the signal processing module of dependent variable information, slip ring; The ground receiver module
The output terminal of said wideband light source is connected through optical fiber with the input end of circulator; The output terminal of said circulator is connected through optical fiber with fiber Bragg grating strain sensor; The return terminal of circulator is connected through optical fiber with the input end of fiber grating demodulation module; The broadband light that wideband light source sends sends fiber Bragg grating strain sensor to, through sending the output terminal of circulator after the fiber Bragg grating strain sensor internal reflection to;
The output terminal of said fiber grating demodulation module is connected with the input end of signal processing module through lead, is used for sending the electric signal that has the fiber optic hub wavelength information to signal processing module;
The output terminal of said signal processing module is connected with the input end of slip ring through lead, and the output terminal of said slip ring is connected with the input end of ground receiver module, is used for sending the digital signal that carries dependent variable information to the ground receiver module.
2. a kind of blower fan strain on-line measuring device based on fiber grating according to claim 1, it is characterized in that: also include alarm, said alarm is connected with the output terminal of signal processing module.
3. a kind of blower fan strain on-line measuring device according to claim 1 based on fiber grating, it is characterized in that: the output terminal of said ground receiver module also is provided with display, and the input end of said display is connected with the output terminal of ground receiver module.
4. a kind of blower fan strain on-line measuring device based on fiber grating according to claim 1, it is characterized in that: the spectral width scope of said wideband light source is between 20nm to 80nm.
5. a kind of blower fan strain on-line measuring device according to claim 1 based on fiber grating; It is characterized in that: said wideband light source, circulator, signal processing module and alarm are formed an installed module and are fixed; Ground receiver module and display are formed an installed module and are fixed; The slip ring independent installation is fixed, and the fiber Bragg grating strain sensor independent installation is fixed.
6. according to the arbitrary described a kind of blower fan strain on-line measuring device based on fiber grating of claim 1 to 5, it is characterized in that: the quantity of described fiber Bragg grating strain sensor equals the merchant of wideband light source spectral width divided by the single-sensor spectral width.
7. a kind of blower fan strain on-line measuring device based on fiber grating according to claim 6 is characterized in that: when the quantity of said fiber Bragg grating strain sensor during more than or equal to two, the connected mode between the said fiber Bragg grating strain sensor is:
Head and the tail are connected in series between the said fiber Bragg grating strain sensor;
Perhaps; Also comprise a shunt; Said shunt output terminal quantity is more than or equal to the quantity of fiber Bragg grating strain sensor; The input end of said shunt is connected with the output terminal of said circulator, and the input end of each fiber Bragg grating strain sensor all is connected with an output terminal of shunt.
8. according to the arbitrary described a kind of blower fan strain on-line measuring device of claim 1 to 5 based on fiber grating; It is characterized in that: when the quantity of said fiber Bragg grating strain sensor during more than or equal to two, the connected mode between the said fiber Bragg grating strain sensor is:
Head and the tail are connected in series between the said fiber Bragg grating strain sensor;
Perhaps; Also comprise a shunt; Said shunt output terminal quantity is more than or equal to the quantity of fiber Bragg grating strain sensor; The input end of said shunt is connected with the output terminal of said circulator, and the input end of each fiber Bragg grating strain sensor all is connected with an output terminal of shunt.
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| CN2011104471999A CN102519384A (en) | 2011-12-28 | 2011-12-28 | Device for detecting blade strain on line based on optical fiber grating |
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| CN2011104471999A CN102519384A (en) | 2011-12-28 | 2011-12-28 | Device for detecting blade strain on line based on optical fiber grating |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103925887A (en) * | 2014-04-16 | 2014-07-16 | 中国计量学院 | All-fiber bend sensor based on peanut structure |
| CN108267264A (en) * | 2016-12-31 | 2018-07-10 | 北京金风科创风电设备有限公司 | Method, device and equipment for calibrating fiber grating sensor of fan blade |
| CN108731597A (en) * | 2018-05-11 | 2018-11-02 | 南京工程学院 | A kind of light path optical-fibre precise displacement sensor altogether |
| CN110657930A (en) * | 2018-06-29 | 2020-01-07 | 中国航发商用航空发动机有限责任公司 | Method and system for measuring vibration stress of part |
| CN112459972A (en) * | 2020-12-01 | 2021-03-09 | 新疆大学 | Wind driven generator main bearing state monitoring device and monitoring method thereof |
| CN112595253A (en) * | 2020-11-10 | 2021-04-02 | 新疆大学 | Surface strain dynamic optical fiber grating detection device |
| CN119714109A (en) * | 2025-03-03 | 2025-03-28 | 深圳市简测智能技术有限公司 | Fan blade large deformation monitoring system and method based on fiber bragg grating sensor |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103925887A (en) * | 2014-04-16 | 2014-07-16 | 中国计量学院 | All-fiber bend sensor based on peanut structure |
| CN108267264A (en) * | 2016-12-31 | 2018-07-10 | 北京金风科创风电设备有限公司 | Method, device and equipment for calibrating fiber grating sensor of fan blade |
| CN108731597A (en) * | 2018-05-11 | 2018-11-02 | 南京工程学院 | A kind of light path optical-fibre precise displacement sensor altogether |
| CN110657930A (en) * | 2018-06-29 | 2020-01-07 | 中国航发商用航空发动机有限责任公司 | Method and system for measuring vibration stress of part |
| CN112595253A (en) * | 2020-11-10 | 2021-04-02 | 新疆大学 | Surface strain dynamic optical fiber grating detection device |
| CN112459972A (en) * | 2020-12-01 | 2021-03-09 | 新疆大学 | Wind driven generator main bearing state monitoring device and monitoring method thereof |
| CN119714109A (en) * | 2025-03-03 | 2025-03-28 | 深圳市简测智能技术有限公司 | Fan blade large deformation monitoring system and method based on fiber bragg grating sensor |
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Application publication date: 20120627 |