CN202511919U - Fiber grating array temperature transmitter based on relative strength edge filtering method - Google Patents
Fiber grating array temperature transmitter based on relative strength edge filtering method Download PDFInfo
- Publication number
- CN202511919U CN202511919U CN2012200484720U CN201220048472U CN202511919U CN 202511919 U CN202511919 U CN 202511919U CN 2012200484720 U CN2012200484720 U CN 2012200484720U CN 201220048472 U CN201220048472 U CN 201220048472U CN 202511919 U CN202511919 U CN 202511919U
- Authority
- CN
- China
- Prior art keywords
- fiber
- optical
- grating array
- array temperature
- optical fiber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
Provided is a fiber grating array temperature transmitter based on a relative strength edge filtering method. The fiber grating array temperature transmitter based on the relative strength edge filtering method comprises a broadband light source, an optical circulator, a plurality of fiber gratings, a photo-electricity demodulation unit, a computer, a transmission optical fiber and a cable, wherein the broadband light source is connected with an input port of the optical circulator through the transmission optical fiber, a first output port of the optical circulator is sequentially connected with the fiber gratings through the transmission optical fiber, a second output port of the optical circulator is connected with an input end of the photo-electricity demodulation unit through the transmission optical fiber, and an output end of the photo-electricity demodulation unit is connected with the computer through the cable. Compared with the prior art, the fiber grating array temperature transmitter based on the relative strength edge filtering method has a real-time and on-line detection ability and a long-distance detection ability, and can be used to measure media like gas, fluid and detect space distribution of temperature. In addition, the fiber grating array temperature transmitter based on the relative strength edge filtering method has the advantages of being wide in measurement range, good in adaptability, high in sensitivity, convenient to operate and the like.
Description
Technical field
The utility model relates to the fiber-optical grating temperature sensor technical field, particularly relates to a kind of optical fiber optical grating array temperature sensor based on relative intensity edge filter method.
Background technology
Temperature is one of fundamental physical quantity of providing of International System of Units, and being needs in industrial and agricultural production and the scientific experiment often to measure and the major parameter of control, also is and the closely-related important physical amount of people's daily life simultaneously.Along with the raising and the continuous production-scale expansion of industrial automatization, the measurement real-time and the remote on-line monitoring of temperature parameter are had higher requirement.
The thermopair that generally adopts at present is difficult to realize temperature is measured and remote online multiple spot distributed monitoring quickly and accurately.This contact temperature-measuring technology also is difficult to guarantee original characteristic in temperature field, is prone to cause error.Yet the development of light transmitting fiber thermometry is for the non-contact temperature measuring The Application of Technology provides favourable precondition.Because it has advantages such as anti-electromagnetic interference (EMI), high temperature resistant, anticorrosive, miniaturization, therefore, very application prospects is arranged.
The light transmitting fiber thermometry can be divided into two types: one type is to utilize the radiant type measuring principle, and optical fiber cooperates light activated element to constitute mechanical structure type transducer as the conductor of transmission luminous flux; Another kind of is that optical fiber itself is exactly temperature sensing part, is again simultaneously the functional form sensor of transmission luminous flux.Optical fiber flexible good, the printing opacity spectral coverage is wide, loss is low, no matter be use on the spot or teletransmission all very convenient, and fibre diameter is little, can be single, bunchy, Y type or array way use, structural arrangement is simple and volume is little.Therefore; As thermometer; The detected object that is suitable for is almost all-embracing, can be applicable to the special occasions that other thermometer is difficult to use, like sealing, high voltage, high-intensity magnetic field, nuclear radiation, strict explosion-proof, waterproof, anticorrosion, special little space or special small workpiece or the like.
Yet fiber-optical grating temperature sensor of the prior art can't be realized the quick real-time measurement, and the test result out of true.Lack reliability.
Therefore, to the problems referred to above that exist in the prior art, needing badly provides a kind of technology of the optical fiber optical grating array temperature sensor based on relative intensity edge filter method to seem particularly important.
The utility model content
The purpose of the utility model be to avoid weak point of the prior art and provide a kind of reliable accurately, optical fiber optical grating array temperature sensor real-time based on relative intensity edge filter method; The ability that should have real-time online and remote detection based on the optical fiber optical grating array temperature sensor of relative intensity edge filter method; Can be used for the measurement of media such as gas, fluid; And can be used for the space distribution of detecting temperature, also have characteristics such as measurement range is big, adaptability good, highly sensitive and easy to operate simultaneously.
The purpose of the utility model realizes through following technical scheme:
A kind of optical fiber optical grating array temperature sensor based on relative intensity edge filter method is provided, includes wideband light source, optical circulator, a plurality of fiber grating, photoelectricity demodulating unit, computer, and Transmission Fibers and cable;
Said wideband light source is connected with the input port of said optical circulator through Transmission Fibers; First output port of said optical circulator is connected with said fiber grating through Transmission Fibers successively, and second output port of said optical circulator is connected with the input end of said photoelectricity demodulating unit through Transmission Fibers; The output terminal of said photoelectricity demodulating unit is connected with said computer through cable.
Wherein, said photoelectricity demodulation unit pack has been drawn together wavelength division multiplexer and opto-electronic conversion array.
Wherein, said wavelength division multiplexer is an array waveguide grating.
Wherein, the detection wavelength of said wideband light source is 1500nm～2000nm.
Wherein, the detection wavelength of said wideband light source is 1530nm～1570nm.
Wherein, the detection wavelength of said wideband light source is 1550nm.
Wherein, said Transmission Fibers is a single-mode fiber.
Wherein, said fiber grating is for cutting the toe fiber grating.
The beneficial effect of the utility model:
The optical fiber optical grating array temperature sensor based on relative intensity edge filter method of the utility model includes wideband light source, optical circulator, a plurality of fiber grating, photoelectricity demodulating unit, computer, and Transmission Fibers and cable; Said wideband light source is connected with the input port of said optical circulator through Transmission Fibers; First output port of said optical circulator is connected with said fiber grating through Transmission Fibers successively, and second output port of said optical circulator is connected with the input end of said photoelectricity demodulating unit through Transmission Fibers; The output terminal of said photoelectricity demodulating unit is connected with said computer through cable.
Compared with prior art, the utlity model has following characteristics:
(1) simple to operate, cheap, response speed is fast, highly sensitive and resolution advantages of higher.For the fiber grating (FBG) of wide bandwidth, the resolution of the detection wavelength of this optical fiber optical grating array temperature sensor reaches ± 5pm, and temperature resolution can reach ± and 0.5 ℃;
(2) be applicable to the new temperature measurement technology of optical fiber.Because optical fiber is insulator, has good remote optical transmission performance, optical loss is extremely low, and the non-constant width of transmission band can use applied range under mal-conditions such as strong electromagnetic, HTHP, atomic radiation, chemical corrosion;
(3) the quick scanning survey of opto-electronic conversion array is realized real monitoring real-time;
(4) except being used for temperature survey, but also counter stress and pressure are measured.
Description of drawings
Utilize accompanying drawing that utility model is described further; But the embodiment in the accompanying drawing does not constitute any restriction to the utility model; For those of ordinary skill in the art, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to following accompanying drawing.
Fig. 1 is the structural representation of a kind of optical fiber optical grating array temperature sensor based on relative intensity edge filter method of the utility model.
In Fig. 1, include:
1---wideband light source,
2---optical circulator,
3,4,5---fiber grating,
6---wavelength division multiplexer,
7---the opto-electronic conversion array,
8---cable,
9---computer,
10---Transmission Fibers,
11---the photoelectricity demodulating unit.
Embodiment
In conjunction with following examples the utility model is further described, but the embodiment of the utility model is not limited thereto.
The embodiment of a kind of optical fiber optical grating array temperature sensor based on relative intensity edge filter method of the utility model; As shown in Figure 1; Include wideband light source, optical circulator, a plurality of fiber grating, photoelectricity demodulating unit, computer, and Transmission Fibers and cable; Said wideband light source is connected with the input port of said optical circulator through Transmission Fibers; First output port of said optical circulator is connected with said fiber grating through Transmission Fibers successively, and second output port of said optical circulator is connected with the input end of said photoelectricity demodulating unit through Transmission Fibers; The output terminal of said photoelectricity demodulating unit is connected with said computer through cable.
Need to prove: optical circulator is an input port and two output ports, and wherein, the output terminal that connects fiber grating is first output port, and the input end that connects the photoelectricity demodulating unit is second output port.
The utility model is placed on a plurality of fiber gratings in the environment to be measured when measuring.Described wideband light source sends broadband light; Arrive fiber grating through optical circulator; The light that is returned by fiber grating is then gone into photoelectrolysis and is transferred the unit through optical circulator is laggard, and the photoelectricity demodulating unit is demodulated into electric signal with light signal, again electric signal is passed to computer afterwards; Temperature information can be demodulated through computer, variation of temperature can be observed on computers visually simultaneously.
Concrete, said photoelectricity demodulation unit pack has been drawn together wavelength division multiplexer and opto-electronic conversion array.
Concrete, said wavelength division multiplexer is an array waveguide grating.
In addition, the wavelength division multiplexer major parameter is a centre wavelength
λ 0=1550.9nm, diffraction progression
m=35.The centre wavelength of opto-electronic conversion array is
λ 0=1550.9nm.
Concrete, the detection wavelength of said wideband light source is 1500nm～2000nm.
Concrete, the detection wavelength of said wideband light source is 1530nm～1570nm.
Concrete, the detection wavelength of said wideband light source is 1550nm.
Concrete, said Transmission Fibers is a single-mode fiber.
Concrete, said fiber grating is for cutting the toe fiber grating.
In addition, fiber grating can also be optical fiber sensing probe, and this optical fiber sensing probe is is perhaps connected and composed by vertical fiber end face by the fiber grating bare fibre vertical with simple end face, FC tail optical fiber plug.Wavelength division multiplexer in the photoelectricity demodulating unit has an input channel; Being connected with photoelectric commutator between output planar waveguide and the output waveguide is connected; The parameter of wavelength division multiplexer and electrooptical device can decide according to the accuracy requirement of measuring; For example, select the higher electrooptical device of sensitivity for use; The computer purpose is the record to data, and Treatment Analysis shows and monitoring.
The thermo-optic effect that working mechanism that the utility model adopted and measuring method are based on FBG causes the change of reflection kernel wavelength, and has utilized wavelength division multiplexer that the demultiplexing function realization temperature of different wave length is measured fast; Be specially the multi-wavelength light beam that wideband light source sends and imported linear array FBG by optical circulator, because measures ambient temperature changes the change that causes each FBG reflection kernel wavelength through Transmission Fibers; This multi-wavelength reflected light transfers the unit by demodulation and demonstration through the electrolysis of circulator lead-in light.
Concrete principle is following: the FBG reflected light incides wavelength division multiplexer through OC, and the light of different wave length is from the different passage outputs of wavelength division multiplexer.λ
n, λ
N+1Be wavelength division multiplexer two adjacency channel centre wavelengths, λ
FBGnIt is the bragg wavelength of n FBG.The lap of FBG reflectance spectrum and wavelength division multiplexer passage transmission spectrum has determined the size of this wavelength division multiplexer passage output intensity.In order to obtain analytic theory, the transmission spectrum of FBG reflectance spectrum and wavelength division multiplexer passage is all represented with Gaussian function approx.
Therefore, the function expression of supposing the FBG reflectance spectrum is:
R, λ
BAnd ω
BBe respectively the FWHM of reflection coefficient, bragg wavelength and the reflectance spectrum of FBGn.
The function expression of the transmission spectrum of wavelength division multiplexer n and n+1 passage is:
T
j, λ
jAnd ω
jBe respectively the FWHM of transmission coefficient, centre wavelength and the transmission spectrum of j passage of wavelength division multiplexer, and hypothesis ω
n=ω
N+1=ω
0, adjacent channel spacing △ λ=λ
N+1-λ
n
Can obtain by (1), (2), when the FBG bragg wavelength is λ
BThe time, the light intensity of j passage output of wavelength division multiplexer is:
Wherein,
,
Can obtain by (3):
Wherein,
Definition wavelength division multiplexer adjacency channel intensity rate logarithm is:
And with (4) substitution (5):
Wherein,
,
.
Can obtain from (6); Wavelength division multiplexer adjacency channel intensity rate logarithm and FBG bragg wavelength are linear under Gaussian approximation, and system wavelength sensitivity d η/d λ is determined by the parameters such as FWHM of wavelength division multiplexer channel spacing △ λ, FWHM and FBG jointly.The FBG bragg wavelength changes with variations such as the temperature in the external world and stress, but at an account temperature T to the influence of FBG reflection wavelength, when extraneous other factors can be ignored, (6) formula can be rewritten as:
Wherein, λ
T0Be that initial temperature is T
0The time FBG bragg wavelength, α is the temperature control of FBG.Visible from the derivation of above parsing; When FBG only receives temperature effect; Wavelength division multiplexer adjacency channel intensity rate logarithm and FBG ambient temperature also are linear relationships, and system temperature sensitivity d η/dT is determined by α, the FWHM of wavelength division multiplexer channel spacing, FWHM and FBG jointly.Convert wavelength measurement into ionization meter through the opto-electronic conversion array, the detection of wavelength division multiplexer passage light intensity is made comparisons, can instead release the residing environment temperature of corresponding FBG.
Should be noted that at last; Above embodiment is only in order to explain the technical scheme of the utility model; But not to the restriction of the utility model protection domain, although with reference to preferred embodiment the utility model has been done explanation at length, those of ordinary skill in the art is to be understood that; Can make amendment or be equal to replacement the technical scheme of the utility model, and not break away from the essence and the scope of the utility model technical scheme.
Claims (8)
1. optical fiber optical grating array temperature sensor based on relative intensity edge filter method is characterized in that: include wideband light source, optical circulator, a plurality of fiber grating, photoelectricity demodulating unit, computer, and Transmission Fibers and cable;
Said wideband light source is connected with the input port of said optical circulator through Transmission Fibers; First output port of said optical circulator is connected in series through Transmission Fibers and said fiber grating successively, and second output port of said optical circulator is connected with the input end of said photoelectricity demodulating unit through Transmission Fibers; The output terminal of said photoelectricity demodulating unit is connected with said computer through cable.
2. a kind of optical fiber optical grating array temperature sensor based on relative intensity edge filter method according to claim 1 is characterized in that: said photoelectricity demodulation unit pack has been drawn together wavelength division multiplexer and opto-electronic conversion array.
3. a kind of optical fiber optical grating array temperature sensor based on relative intensity edge filter method according to claim 2, it is characterized in that: said wavelength division multiplexer is an array waveguide grating.
4. a kind of optical fiber optical grating array temperature sensor based on relative intensity edge filter method according to claim 1, it is characterized in that: the detection wavelength of said wideband light source is 1500nm～2000nm.
5. a kind of optical fiber optical grating array temperature sensor based on relative intensity edge filter method according to claim 4, it is characterized in that: the detection wavelength of said wideband light source is 1530nm～1570nm.
6. a kind of optical fiber optical grating array temperature sensor based on relative intensity edge filter method according to claim 5, it is characterized in that: the detection wavelength of said wideband light source is 1550nm.
7. a kind of optical fiber optical grating array temperature sensor based on relative intensity edge filter method according to claim 1, it is characterized in that: said Transmission Fibers is a single-mode fiber.
8. a kind of optical fiber optical grating array temperature sensor based on relative intensity edge filter method according to claim 1, it is characterized in that: said fiber grating is for cutting the toe fiber grating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200484720U CN202511919U (en) | 2012-02-15 | 2012-02-15 | Fiber grating array temperature transmitter based on relative strength edge filtering method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200484720U CN202511919U (en) | 2012-02-15 | 2012-02-15 | Fiber grating array temperature transmitter based on relative strength edge filtering method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202511919U true CN202511919U (en) | 2012-10-31 |
Family
ID=47064397
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200484720U Expired - Fee Related CN202511919U (en) | 2012-02-15 | 2012-02-15 | Fiber grating array temperature transmitter based on relative strength edge filtering method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202511919U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103714869A (en) * | 2013-12-09 | 2014-04-09 | 西安理工大学 | Fiber bragg grating sensing based system and method for monitoring reactor core temperature |
| KR20210088366A (en) * | 2020-01-06 | 2021-07-14 | 주식회사 피피아이 | High resolution optical wavelength power meter, reflected optical wavelength scanning device using the same and reflected optical wavelength scanning system using the same |
| CN113639892A (en) * | 2021-08-13 | 2021-11-12 | 山东省科学院激光研究所 | Fiber grating temperature sensor and quasi-distributed temperature measurement system |
-
2012
- 2012-02-15 CN CN2012200484720U patent/CN202511919U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103714869A (en) * | 2013-12-09 | 2014-04-09 | 西安理工大学 | Fiber bragg grating sensing based system and method for monitoring reactor core temperature |
| KR20210088366A (en) * | 2020-01-06 | 2021-07-14 | 주식회사 피피아이 | High resolution optical wavelength power meter, reflected optical wavelength scanning device using the same and reflected optical wavelength scanning system using the same |
| KR102335752B1 (en) * | 2020-01-06 | 2021-12-06 | 주식회사 피피아이 | High resolution optical wavelength power meter, reflected optical wavelength scanning device using the same and reflected optical wavelength scanning system using the same |
| CN113639892A (en) * | 2021-08-13 | 2021-11-12 | 山东省科学院激光研究所 | Fiber grating temperature sensor and quasi-distributed temperature measurement system |
| CN113639892B (en) * | 2021-08-13 | 2024-02-02 | 山东省科学院激光研究所 | Fiber bragg grating temperature sensor and quasi-distributed temperature measurement system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101949744B (en) | Fiber grating-based transformer internal temperature detection system | |
| CN108507697B (en) | A kind of sea water temperature depth profile sampling towed system based on Fibre Optical Sensor | |
| CN201845405U (en) | Optical fiber grating temperature fire alarm system employing combination of etalon and temperature control grating | |
| CN102269573B (en) | Quasi-distributed composite structure strain and temperature detection system | |
| CN201892586U (en) | Optical fiber grating-based internal temperature detection system for transformer | |
| CN103591971B (en) | A kind of localization method of fiber grating | |
| CN103398800B (en) | A kind of for large structure quasi-distributed fiber grating temperature strain measuring system | |
| CN103743675B (en) | For salimity measurement fibre-optical probe and use the measurement mechanism of this fibre-optical probe | |
| CN202648830U (en) | A distributed fiber sensing device based on Brillouin scattering | |
| CN104316106A (en) | Optical fiber sensor based on Mach-Zehnder interference and fiber bragg grating | |
| CN103759855A (en) | Temperature sensing system with FBG | |
| CN101762342B (en) | Parallel multi-point type optical fiber temperature detection method and sensor | |
| CN103076108A (en) | Novel power cable conductor temperature measuring sensor based on FBG (fiber bragg grating) | |
| CN104931431A (en) | FPI (Fabry-Perot interferometer) hydrogen sensor based on fiber brag grating microcavity | |
| CN100541175C (en) | Quasi-distributed optical fiber concentration sensor | |
| CN203657934U (en) | Reflection-type temperature/refractive index two-parameter sensing device employing long-period FBG based on Sagnac ring | |
| CN202511919U (en) | Fiber grating array temperature transmitter based on relative strength edge filtering method | |
| CN201707750U (en) | Gaseous spectrum absorption box and temperature control grating and combined fiber grating fire hazard warning system | |
| CN207300268U (en) | Fiber Bragg Grating FBG demodulating equipment | |
| CN201903411U (en) | Power equipment temperature online monitoring system based on fiber bragg grating temperature sensor | |
| CN202511922U (en) | Oppc optical cable stress and carrying capacity measuring and calculating system | |
| CN104931458A (en) | MZI (Mach-Zehnder interferometer) hydrogen sensor based on fiber brag grating microcavity | |
| CN102183488A (en) | Refractive index sensor based on blazed long-period fibre grating | |
| CN207036297U (en) | A kind of optical fiber grating temperature-measuring system | |
| CN101329203A (en) | Apparatus for measuring temperature of alternating current-direct current lightning arrestor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121031 Termination date: 20140215 |