CN201477337U - Sensing wavelength demodulator based on triangular spectrum fiber grating - Google Patents
Sensing wavelength demodulator based on triangular spectrum fiber grating Download PDFInfo
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- CN201477337U CN201477337U CN2009201728896U CN200920172889U CN201477337U CN 201477337 U CN201477337 U CN 201477337U CN 2009201728896 U CN2009201728896 U CN 2009201728896U CN 200920172889 U CN200920172889 U CN 200920172889U CN 201477337 U CN201477337 U CN 201477337U
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Abstract
The utility model discloses a sensing wavelength demodulator based on a triangular spectrum fiber grating, which is suitable for the fields of optical fiber communication, optical fiber sensing, traffic information engineering and control technology and the like. A broadband light source (1) is connected with a first port (21) of a first three-port optical circulator; a second port (22) of the first three-port optical circulator is connected with one end of a fiber Bragg grating (FBG) (31); a third port (23) of the first three-port optical circulator is connected with one end of the triangular spectrum fiber grating (32); and the other end of the triangular spectrum fiber grating is connected with a photoelectric detector (4). The photoelectric detector detects the optical power transmitted through the triangular spectrum fiber grating to perform the function of a tilt filter; and the photoelectric detector detects the variation of the output optical intensity to obtain the wavelength shift and realize the sensing demodulation; and the triangular spectrum fiber grating and the FBG have the same temperature sensitivity, which effectively solves the problem that the cross sensitivity between strain and temperature in a sensing system.
Description
Technical field
The utility model relates to based on triangular Bragg grating sensing wavelength demodulation device, is applicable to fields such as optical fiber communication, Fibre Optical Sensor, Traffic Information Engineering ﹠ Control technology.
Background technology
Fiber grating is to utilize the photosensitivity in the optical fiber to make.Fiber grating can be divided into bragg grating and long period fiber grating according to the cycle, and the general cycle of bragg grating, the wavelength of long period fiber grating was more than 1 micron below 1 micron.Bragg grating abbreviates fiber grating under many circumstances as, and it is according to cyclophysis, can be divided into even constant uniform fiber grating of cycle, perhaps the chirped fiber grating that longitudinally changes of cycle.Uniform fiber grating reflectance spectrum bandwidth is generally less than 0.5nm, and the bandwidth of chirped fiber grating can be from 0.1nm to tens nm, even nm is wide more than 100.
The ultimate principle of fiber-optic grating sensor is to utilize fiber grating spectrum, especially its peak is with the characteristic of temperature and STRESS VARIATION, the change transitions that the external world is measured is the variation of bragg wavelength, and the subtle change that therefore how to detect bragg wavelength promptly has been demodulated to the key issue of fiber-optic grating sensor practicability to the Wavelength-encoding signal.Demodulating system is exactly to be used for finishing the variation of measuring bragg wavelength.Have only by demodulating system and just can obtain extraneous measured information, realize the Practical significance and the value of sensing, it has important effect in the whole sensor system.
Optical fiber grating sensing have not charged, the anti-radio frequency of fibre-optic transmission system (FOTS), anti-electromagnetic interference (EMI), anti-flaming, explosion-proof, anticorrosive, high pressure resistant, anti-ionising radiation, in light weight, volume is little and have advantages such as large-signal transmission bandwidth, optical fiber grating sensing is used more and more widely.
Triangular Bragg grating triangle Bragg grating, perhaps be referred to as the triangle bragg grating and belong to nonlinearly chirped fiber grating, its characteristic is: in its bandwidth range, the change of reflectivity and lambda1-wavelength is linear in certain wavelength coverage.Can utilize this characteristic of triangular Bragg grating, be the signal of optical power change with the conversion of signals of wavelength variations.
Wavelength demodulation scheme mainly is divided into matched filtering demodulation and edge demodulation by filter two classes.Wherein, utilize the matched filtering method demodulation of F-P wave filter and fiber grating, need carry out tuningly to wavelength, demodulation speed is slow, complex structure.
And utilize the edge demodulation by filter of fiber grating transmission spectrum: it is to utilize the quasi linear region auto of long period fiber grating transmission spectrum to carry out demodulation.But long-period gratings is relatively responsive to environment, and the environmental characteristics of the bragg grating uniform fiber grating of using with sensing is inconsistent, should not adopt.
Because the deficiency of above-mentioned fiber grating sensing demodulation method, in order to bring into play the optical fiber grating sensing advantage, utilize that triangular Bragg grating is low to the environment sensitive degree, stability is high and with advantage such as sensor fibre grating coupling, propose a kind of new fiber grating sensing demodulation technology and seem particularly important, designed sensing wavelength demodulation device based on triangular Bragg grating.
The utility model content
Technical problem to be solved in the utility model is to overcome the deficiencies in the prior art, utilizes the advantage of triangular Bragg grating sensing and demodulating, proposes the sensing wavelength demodulation device based on triangular Bragg grating.
The technical solution of the utility model:
A kind of sensing wavelength demodulation device based on triangular Bragg grating, the wideband light source of this sensing wavelength demodulation device connects first port of the one or three ports light rings, and second port of the one or three ports light rings connects an end of bragg grating; The 3rd port of the one or three ports light rings connects an end of triangular Bragg grating, and the other end of triangular Bragg grating is connected with photodetector.
Photodetector detects through triangular Bragg grating and sees through the luminous power of coming; The variable quantity that photodetector detects output intensity obtains wavelength shift, realizes sensing and demodulating; Triangular Bragg grating all has identical temperature control with bragg grating, and the wave length shift characteristic unanimity that the variation of ambient temperature causes realizes temperature compensation.
The 3rd port of described the one or three ports light rings connects first port of the two or three port photocirculator, second port of the two or three port photocirculator connects an end of triangular Bragg grating, and the 3rd port of the two or three port photocirculator is connected with photodetector;
Photodetector detects the luminous power that reflects back through triangular Bragg grating.
The one or three ports light rings is replaced by three port coupler, first port of three port coupler connects wideband light source, second port of three port coupler connects an end of triangular Bragg grating, the other end of triangular Bragg grating is connected with photodetector, and the 3rd port of three port coupler connects an end of bragg grating;
Photodetector detects through triangular Bragg grating and sees through the luminous power of coming.
The one or three ports light rings is replaced by four ports light rings, first port of four ports light rings connects wideband light source, second port of four ports light rings connects an end of bragg grating, the 3rd port of four ports light rings connects an end of triangular Bragg grating, and the 4th port of four ports light rings is connected with photodetector;
Photodetector detects the luminous power that reflects back through triangular Bragg grating.
The beneficial effects of the utility model:
Adopt triangular Bragg grating to compare, have more stable performance, and the environmental characteristics of the fiber grating used of triangular Bragg grating and sensing is consistent, can effectively separate the temperature and the emergent property of fiber grating with long-period gratings.
Adopt triangular Bragg grating to carry out demodulation as the linear edges band filter, because Fiber Bragg Grating FBG has identical temperature control with triangular Bragg grating, the wave length shift characteristic unanimity that the variation of ambient temperature causes can realize temperature compensation.Utilize triangular Bragg grating to carry out edge demodulation by filter, simple in structure, easy to be reliable, volume is little, and cost is low; In adopting the system of Fiber Bragg Grating FBG as sensor, use triangular Bragg grating that it is carried out demodulation, because Fiber Bragg Grating FBG and triangular Bragg grating are in the same way for the change of temperature, both cancel out each other, and this just makes this system can exempt the interference of temperature.
The reflectivity of triangular grating is linear relation with the wavelength variations of incident light.Utilize this characteristic, can effectively the situation of change of lambda1-wavelength be converted to the variation of luminous power, thereby realize the function of hypotenuse wave filter.
Because triangular Bragg grating is responsive simultaneously to temperature and strain, i.e. temperature and strain can cause the variation of bragg wavelength simultaneously, therefore by the wavelength of detection fiber grating, can't be distinguished temperature and strain.And the drift of the wavelength that temperature compensation act can cause temperature weeds out, thereby makes strain measurement not be subjected to the influence of environment temperature.
Description of drawings
Fig. 1 adopts the synoptic diagram based on the sensing wavelength demodulation device of triangular Bragg grating of three port photocirculators.
Fig. 2 adopts the synoptic diagram based on the sensing wavelength demodulation device of triangular Bragg grating of two three port photocirculators.
Fig. 3 adopts the synoptic diagram based on the sensing wavelength demodulation device of triangular Bragg grating of three port coupler.
Fig. 4 adopts the synoptic diagram based on the sensing wavelength demodulation device of triangular Bragg grating of four ports light rings.
Fig. 5 wavelength and reflectivity are and increase progressively relation and bandwidth is the triangular Bragg grating reflection spectrogram of 30nm.
Fig. 6 wavelength and reflectivity relation of tapering off and bandwidth are the triangular Bragg grating reflection spectrogram of 30nm.
Fig. 7 wavelength and reflectivity are and increase progressively relation and bandwidth is the triangular Bragg grating reflection spectrogram of 90nm.
Fig. 8 wavelength and reflectivity relation of tapering off and bandwidth are the triangular Bragg grating reflection spectrogram of 3nm.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described.
Embodiment one
A kind of sensing wavelength demodulation device based on triangular Bragg grating is as Fig. 1 and shown in Figure 5.
This sensing wavelength demodulation device comprises: wideband light source the 1, the 1 ports light rings 2, bragg grating 31, triangular Bragg grating 32, photodetector 4; Being connected between the device of its formation:
Wideband light source 1 connects first port 21 of the one or three ports light rings, second port 22 of the one or three ports light rings connects an end of bragg grating 31, the 3rd port 23 of the one or three ports light rings connects an end of triangular Bragg grating 32, and the another port of triangular Bragg grating 32 is connected with photodetector 4.
The reflection peak of bragg grating 31 is positioned at the short wavelength side of triangular Bragg grating 32 reflection peaks, when the external world is acted on bragg grating 31 by the physical quantity of sensing, the reflection wavelength of bragg grating 31 moves to long wavelength's direction, the energy that bragg grating 31 is reflected enters triangular Bragg grating 32, portion of energy sees through triangular Bragg grating 32 and enters photodetector 4, because the transmissivity of triangular Bragg grating 32, therefore sees through the energy minimizing that triangular Bragg grating 32 enters photodetector 4 along with the increase of wavelength reduces gradually; The variable quantity that photodetector 4 detects output intensity obtains wavelength shift, realizes sensing and demodulating.
The wavelength 1540nm of described triangular Bragg grating 32 reflection peaks of present embodiment.
The shared bandwidth of triangular Bragg grating 32 hypotenuses is the bandwidth of triangular Bragg grating 32, and the mid point of bandwidth is defined as the separatrix of long wavelength side and short wavelength side.Wavelength is a long wavelength side greater than the wavelength of bandwidth mid point, and wavelength is a short wavelength side less than the wavelength of bandwidth mid point.
Embodiment two
Based on the sensing wavelength demodulation device of triangular Bragg grating, this wavelengt demodulator is the sensing wavelength demodulation scheme that adopts the one or three port photocirculator the 2, the 33 port photocirculator 5 and triangular Bragg grating 32, as Fig. 2 and Fig. 6.
The reflection peak of Fiber Bragg Grating FBG 31 is positioned at the long wavelength side of triangular Bragg grating 32 reflection peaks, when the external world is acted on Fiber Bragg Grating FBG 31 by the physical quantity of sensing, the reflection wavelength of Fiber Bragg Grating FBG 31 moves to long wavelength's direction, the energy that Fiber Bragg Grating FBG 31 is reflected enters triangular Bragg grating 32, the energy that triangular Bragg grating 32 reflects enters photodetector 4, because the reflectivity of triangular Bragg grating 32 is along with the increase of wavelength reduces gradually, so triangular Bragg grating 32 reflects the energy minimizing that enters photodetector 4; The variable quantity that photodetector 4 detects output intensity obtains wavelength shift, realizes sensing and demodulating.
The wavelength 1553nm of described triangular Bragg grating 32 reflection peaks of present embodiment.
The shared bandwidth of triangular Bragg grating 32 hypotenuses is the bandwidth of triangular Bragg grating 32, and the mid point of bandwidth is defined as the separatrix of long wavelength side and short wavelength side.Wavelength is a long wavelength side greater than the wavelength of bandwidth mid point, and wavelength is a short wavelength side less than the wavelength of bandwidth mid point.
Embodiment three
Based on the sensing wavelength demodulation device of triangular Bragg grating, this wavelengt demodulator is the sensing wavelength demodulation scheme that adopts three port coupler 6 and triangular Bragg grating 32, sees Fig. 3 and Fig. 7.
The reflection peak of Fiber Bragg Grating FBG 31 is positioned at the short wavelength side of triangular Bragg grating 32 reflection peaks, when the external world is acted on Fiber Bragg Grating FBG 31 by the physical quantity of sensing, the reflection wavelength of Fiber Bragg Grating FBG 31 moves to long wavelength's direction, the energy that Fiber Bragg Grating FBG 31 is reflected enters triangular Bragg grating 32, portion of energy sees through triangular Bragg grating 32 and enters photodetector 4, because the transmissivity of triangular Bragg grating 32, therefore sees through the energy minimizing that triangular Bragg grating 32 enters photodetector 4 along with the increase of wavelength reduces gradually; The variable quantity that photodetector 4 detects output intensity obtains wavelength shift, realizes sensing and demodulating.
The wavelength 1550nm of described triangular Bragg grating 32 reflection peaks of present embodiment.
The shared bandwidth of triangular Bragg grating 32 hypotenuses is the bandwidth of triangular Bragg grating 32, and the mid point of bandwidth is defined as the separatrix of long wavelength side and short wavelength side.Wavelength is a long wavelength side greater than the wavelength of bandwidth mid point, and wavelength is a short wavelength side less than the wavelength of bandwidth mid point.
Embodiment four
Based on the sensing wavelength demodulation device of triangular Bragg grating, this wavelengt demodulator is the sensing wavelength demodulation scheme that adopts four ports light rings 7 and triangular Bragg grating 32, sees Fig. 4 and Fig. 8.
The reflection peak of Fiber Bragg Grating FBG 31 is positioned at the long wavelength side of triangular Bragg grating 32 reflection peaks, when the external world is acted on Fiber Bragg Grating FBG 31 by the physical quantity of sensing, the reflection wavelength of Fiber Bragg Grating FBG 31 moves to long wavelength's direction, the energy that Fiber Bragg Grating FBG 31 is reflected enters triangular Bragg grating 32, the energy that triangular Bragg grating 32 reflects enters photodetector 4, because the reflectivity of triangular Bragg grating 32 is along with the increase of wavelength reduces gradually, so triangular Bragg grating 32 reflects the energy minimizing that enters photodetector 4; The variable quantity that photodetector 4 detects output intensity obtains wavelength shift, realizes sensing and demodulating.
The wavelength 1551nm of described triangular Bragg grating 32 reflection peaks of present embodiment.
The shared bandwidth of triangular Bragg grating 32 hypotenuses is the bandwidth of triangular Bragg grating 32, and the mid point of bandwidth is defined as the separatrix of long wavelength side and short wavelength side.Wavelength is a long wavelength side greater than the wavelength of bandwidth mid point, and wavelength is a short wavelength side less than the wavelength of bandwidth mid point.
Embodiment five
A kind of sensing wavelength demodulation device based on triangular Bragg grating is as Fig. 1 and shown in Figure 5.
This sensing wavelength demodulation device comprises: wideband light source the 1, the 1 ports light rings 2, bragg grating 31, triangular Bragg grating 32, photodetector 4; Being connected between the device of its formation:
Wideband light source 1 connects first port 21 of the one or three ports light rings, second port 22 of the one or three ports light rings connects an end of bragg grating 31, the 3rd port 23 of the one or three ports light rings connects an end of triangular Bragg grating 32, and the another port of triangular Bragg grating 32 is connected with photodetector 4.
The reflection peak of bragg grating 31 is positioned at the long wavelength side of triangular Bragg grating 32 reflection peaks, when the external world is acted on bragg grating 31 by the physical quantity of sensing, the reflection wavelength of bragg grating 31 moves to short wavelength's direction, the energy that bragg grating 31 is reflected enters triangular Bragg grating 32, portion of energy sees through triangular Bragg grating 32 and enters photodetector 4, because the transmissivity of triangular Bragg grating 32, therefore sees through the energy increase that triangular Bragg grating 32 enters photodetector 4 along with the increase of wavelength reduces gradually; The variable quantity that photodetector 4 detects output intensity obtains wavelength shift, realizes sensing and demodulating.
The wavelength 1556nm of described triangular Bragg grating 32 reflection peaks of present embodiment.
The shared bandwidth of triangular Bragg grating 32 hypotenuses is the bandwidth of triangular Bragg grating 32, and the mid point of bandwidth is defined as the separatrix of long wavelength side and short wavelength side.Wavelength is a long wavelength side greater than the wavelength of bandwidth mid point, and wavelength is a short wavelength side less than the wavelength of bandwidth mid point.
The employed device of the utility model is commercially available device.Triangular Bragg grating 32 bandwidth ranges are 0.5～100nm.
Claims (4)
1. sensing wavelength demodulation device based on triangular Bragg grating, the wideband light source of this sensing wavelength demodulation device (1) connects first port (21) of the one or three ports light rings, and second port (22) of the one or three ports light rings connects an end of bragg grating (31); The 3rd port (23) of the one or three ports light rings connects an end of fiber grating, and the another port of fiber grating is connected with photodetector (4);
It is characterized in that: the fiber grating that connects between the 3rd port (23) of the one or three ports light rings and the photodetector (4) is triangular Bragg grating (32);
Photodetector (4) detects through triangular Bragg grating (32) and sees through the luminous power of coming; The variable quantity that photodetector (4) detects output intensity obtains wavelength shift, realizes sensing and demodulating; Triangular Bragg grating (32) all has identical temperature control with bragg grating (31), the wave length shift characteristic unanimity that the variation of ambient temperature causes.
2. a kind of sensing wavelength demodulation device according to claim 1 based on triangular Bragg grating, it is characterized in that: the 3rd port (23) of described the one or three ports light rings connects first port (51) of the two or three port photocirculator (5), second port (52) of the two or three port photocirculator connects an end of triangular Bragg grating (32), and the 3rd port (53) of the two or three port photocirculator (5) is connected with photodetector (4);
Photodetector (4) detects the luminous power that reflects back through triangular Bragg grating (32).
3. a kind of sensing wavelength demodulation device according to claim 1 based on triangular Bragg grating, it is characterized in that: the one or three ports light rings (2) is replaced by three port coupler (6), first port (61) of three port coupler connects wideband light source (1), second port (62) of three port coupler connects an end of triangular Bragg grating (32), the other end of triangular Bragg grating (32) is connected with photodetector (4), and the 3rd port (63) of three port coupler connects an end of bragg grating (31);
Photodetector (4) detects through triangular Bragg grating (32) and sees through the luminous power of coming.
4. a kind of sensing wavelength demodulation device according to claim 1 based on triangular Bragg grating, it is characterized in that: the one or three ports light rings (2) is replaced by four ports light rings (7), first port (71) of four ports light rings connects wideband light source (1), second port (72) of four ports light rings connects an end of bragg grating (31), the 3rd port (73) of four ports light rings connects an end of triangular Bragg grating (32), and the 4th port (74) of four ports light rings is connected with photodetector (4);
Photodetector (4) detects the luminous power that reflects back through triangular Bragg grating (32).
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102353394A (en) * | 2011-06-17 | 2012-02-15 | 武汉理工大学 | Time division multiplexing (TDM)-based low-reflectivity triangle spectrum-shaped fiber grating sensing system |
| CN103776475A (en) * | 2014-01-28 | 2014-05-07 | 浙江大学 | Optical fiber sensor and sensing method based on linear filter and photoelectric detector |
| CN108120479A (en) * | 2017-11-24 | 2018-06-05 | 辽宁世达通用航空股份有限公司 | Medicinal liquid flow flowmeter sensor is sprayed in a kind of agricultural |
-
2009
- 2009-08-20 CN CN2009201728896U patent/CN201477337U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102353394A (en) * | 2011-06-17 | 2012-02-15 | 武汉理工大学 | Time division multiplexing (TDM)-based low-reflectivity triangle spectrum-shaped fiber grating sensing system |
| CN103776475A (en) * | 2014-01-28 | 2014-05-07 | 浙江大学 | Optical fiber sensor and sensing method based on linear filter and photoelectric detector |
| CN108120479A (en) * | 2017-11-24 | 2018-06-05 | 辽宁世达通用航空股份有限公司 | Medicinal liquid flow flowmeter sensor is sprayed in a kind of agricultural |
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Granted publication date: 20100519 Termination date: 20120820 |