CN106197741B - Temperature-detecting device based on micro-nano long-period fiber grating sensor and method - Google Patents
Temperature-detecting device based on micro-nano long-period fiber grating sensor and method Download PDFInfo
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- CN106197741B CN106197741B CN201610551819.6A CN201610551819A CN106197741B CN 106197741 B CN106197741 B CN 106197741B CN 201610551819 A CN201610551819 A CN 201610551819A CN 106197741 B CN106197741 B CN 106197741B
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- 239000000835 fiber Substances 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 10
- 239000013307 optical fiber Substances 0.000 claims abstract description 49
- 238000012545 processing Methods 0.000 claims abstract description 10
- 230000005540 biological transmission Effects 0.000 claims description 6
- 239000006185 dispersion Substances 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 230000005855 radiation Effects 0.000 claims description 2
- 230000002269 spontaneous effect Effects 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 7
- 230000035945 sensitivity Effects 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 description 4
- 239000002121 nanofiber Substances 0.000 description 4
- 238000001228 spectrum Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000000411 transmission spectrum Methods 0.000 description 2
- 238000009529 body temperature measurement Methods 0.000 description 1
- 230000000747 cardiac effect Effects 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011551 heat transfer agent Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000004038 photonic crystal Substances 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
Abstract
The invention discloses a kind of temperature-detecting device and method based on micro-nano long-period fiber grating sensor, wideband light source sends out laser signal and enters micro-nano long-period fiber grating sensor, the modulated signal of shift frequency is exported after acousto-optic modulator is modulated, modulated signal is divided into two beam signal lights through the first coupler, respectively laser signal to be analyzed is exported after the first optical fiber and the second optical fiber are merged into the second coupler, laser signal to be analyzed is converted to electric signal through photodetector, electric signal measures the strength information of its signal through signal processing unit, temperature information to be measured is obtained with reference to the quantitative relationship of the strength information and temperature demarcated in advance.Present invention utilizes the centre wavelengths of micro-nano long-period fiber grating sensor for the high sensitivity of temperature, when temperature change, the wavelength change of micro-nano long-period fiber grating sensor, phase difference between first optical fiber and the second optical fiber changes, temperature information to be measured is obtained by the Strength Changes of detecting system output signal caused by measurement, temperature information can be accurately detected, is had the advantages that of low cost and simple in structure.
Description
Technical field
The present invention relates to a kind of fibre optical sensors, and in particular to a kind of temperature based on micro-nano long-period fiber grating sensor
Spend detection device and method.
Background technology
Long-period fiber grating sensor refer in the fibre core of optical fiber introduce refractive index cyclically-varying, the period with it is red
External wave is in the same order of magnitude, usually hundreds of microns.Long-period fiber grating sensor is by the optical coupling of a certain frequency range in guided wave
To being lost in covering, transmission characteristic can change because of the influence of factors such as extraneous stress, temperature, pass through resonance wave
Long tuning obtains heat transfer agent, have electromagnetism interference, anticorrosive, electrical isolation, highly sensitive and low cost and with it is general
The advantages that good compatibility of thang-kng fibre, suitable for accurate, accurate measurement.Compared with common Bragg gratings, long period
The reacting condition of fiber grating pair environment is sensitiveer, and has many advantages, such as that low reflection, measurement method are simple, is a kind of ideal
Sensing element.Therefore, highly sensitive fiber-optic grating sensor is an important directions of modern sensor development, long period light
Fine grating is for sensing, prior art report.2012, the researchers such as Kun were educated in vain and propose cascade-connection long period photonic crystal light
The patent of invention of fine grating temperature sensor, application number 201210525114.9, the invention is using cascade-connection long period photon
Crystal optical fibre grating, fills heat-sensitive materials in covering airport, screen periods can the wave band selected by reality determine.Pass through control
The temperature of heat-sensitive materials, change the effective refractive index of grating coupled mode makes temperature to change the centre wavelength of grating transmission spectrum
The variation of degree is presented as the offset of transmission spectral line, realizes the thermometer sensor DS18B20 of tunable wave length.The same year, Qiao Xue light etc. study people
Member proposes that the patent of invention of dual period fiber grating Temperature Humidity Sensor, application number 201210088050.0, the patent of invention are
When the temperature and humidity of external environment changes, the effective refractive index of long-period fiber grating fibre core basic mode and cladding mode and
Screen periods change, and resonance wavelength changes, and refractive index changes, by detecting temperature sensitive type long-period fiber grating
With the transmission peak wavelength of sense wet type long-period fiber grating, the temperature and humidity information of environment can be obtained, realize that double parameters are surveyed simultaneously
Amount；2013, equal researchers proposed to demodulate the hair of the temperature sensor of ordinary optic fibre grating based on long-period gratings Yang Yu by force
Bright patent, application number 201310316860.1, the invention effectively eliminate light source power and rise and fall to fiber-optic grating sensor demodulation
The influence of precision.2015, the researchers such as M.Najaria propose temperature based on micro-nano long-period fiber grating sensor and
Stress sensing system (Najari M, Javan A M, Amiri N.Hybrid all-fiber sensor for
simultaneous strain and temperature measurements based on Mach–Zehnder
interferometer[J].Optik-International Journal for Light and Electron Optics,
2015,126(19):2022-2025.)；2016, the researchers such as Jia Shi proposed that long-period fiber grating cascades polarization-maintaining light
Fine temperature and refractive index detecting system (Shi J, Su G, Xu D, et al.A Dual-Parameter Sensor Using
a Long-Period Grating Concatenated With Polarization Maintaining Fiber in
Sagnac Loop[J].IEEE Sensors Journal,2016,16(11):4326-4330.)。
Since the long-period fiber grating sensor resonant bandwidth of general single mode fiber is larger, centre wavelength is caused to be difficult to standard
It really measures, causes the precision of temperature detection not high；In addition, since its transmission spectrum bandwidth is bigger, if spectrometer in measurement
Resolution ratio is relatively low, will introduce bigger wavelength readings error, limits the long-period gratings sensing of general single mode fiber
The Measurement Resolution of device.Just because of these reasons so that directly measure the long-period fiber grating sensing of general single mode fiber
The transmission peaks of device are to be grossly inaccurate come the information for obtaining temperature, just seem that measurement accuracy is inadequate really practicing aspect
And have the shortcomings that error is larger etc..
Invention content
Goal of the invention：In view of the above-mentioned deficiencies in the prior art, it is an object of the present invention to provide a kind of based on micro-nano long period light
The temperature-detecting device and method of fiber grating sensor, improve temperature detecting precision.
Technical solution：The present invention provides a kind of temperature-detecting device based on micro-nano long-period fiber grating sensor,
Including sequentially connected wideband light source, micro-nano long-period fiber grating sensor, acousto-optic modulator, the first coupler, optical fiber,
Two couplers, photodetector and signal processing unit, the optical fiber include the first optical fiber and the second optical fiber, the first coupler point
The second coupler is not connected to by the first optical fiber and the second optical fiber.
In order to increase the range of testing temperature to be checked, the wideband light source is that the spontaneous radiation of 1525nm~1565nm wave bands is put
Big wideband light source.
Further, first optical fiber and the second optical fiber are in single mode optical fiber, dispersion shifted optical fiber and highly nonlinear optical fiber
One or two.
Further, the photodetector is balanced detector, and response wave length is consistent with wideband light source wave band, to improve
Measurement accuracy.
A kind of temperature checking method based on micro-nano long-period fiber grating sensor, wideband light source send out laser signal into
Enter micro-nano long-period fiber grating sensor, the laser signal exported from micro-nano long-period fiber grating sensor enters acousto-optic tune
Device processed exports the modulated signal of shift frequency after acousto-optic modulator is modulated, and modulated signal is divided into two beam signal lights through the first coupler,
Laser signal to be analyzed is exported after the first optical fiber and the second optical fiber are merged into the second coupler respectively, it is to be analyzed
Laser signal be converted to electric signal through photodetector, electric signal measures the strength information of its signal through signal processing unit,
Temperature information to be measured is obtained with reference to the quantitative relationship of the strength information and temperature demarcated in advance.
Further, the variation of temperature causes the change of micro-nano long-period fiber grating sensor transmission peak wavelength, the first optical fiber
And the second phase difference between optical fiber changes, and causes the change into the luminous power of photodetector so that photodetection
The intensity of device output electric signal changes, and testing temperature is waited for by measuring the variation acquisition of its electrical signal intensity.
Advantageous effect：Present invention utilizes the centre wavelengths of micro-nano long-period fiber grating sensor for the Gao Ling of temperature
Sensitivity, when temperature change, the wavelength change of micro-nano long-period fiber grating sensor, the phase between the first optical fiber and the second optical fiber
Potential difference changes, and temperature information to be measured is obtained by the Strength Changes of detecting system output signal caused by measurement, can
Accurate detection temperature information, has the advantages that of low cost and simple in structure.
Description of the drawings
Fig. 1 is the structural schematic diagram of apparatus of the present invention；
Fig. 2 is the transmitted spectrum of micro-nano long-period fiber grating sensor in embodiment；
Fig. 3 is the spectrum diagram of temperature change in embodiment；
Fig. 4 is the signal strength relation schematic diagram in the case of different temperatures in embodiment.
Specific implementation mode
Technical solution of the present invention is described in detail below, but protection scope of the present invention is not limited to the implementation
Example.
Embodiment：
Embodiment 1：A kind of temperature-detecting device based on micro-nano long-period fiber grating sensor, as shown in Figure 1, including
Wideband light source 100, micro-nano long-period fiber grating sensor 101, acousto-optic modulator 102, the first coupler 103, the first optical fiber
104, the second optical fiber 105, the second coupler 106, photodetector 107 and signal processing unit 108.Wideband light source 100, micro-nano
Long-period fiber grating sensor 101, acousto-optic modulator 102 and the first coupler 103 are sequentially connected, the first coupler 103 warp
105 two first optical fiber 104, the second optical fiber light paths are respectively connected to the second coupler 106, are then sequentially connected photodetector
107 and signal processing unit 108.The present embodiment middle width strip light source 100 is Amonics ALS-18 light sources, and output power is
18dBm, wave-length coverage are 1528~1564nm, and the laser sent out enters micro-nano long-period fiber grating sensor 101
A port, micro-nano long-period fiber grating sensor 101 are to utilize CO2Pulse laser is carved on general single mode micro-nano fiber
The micro-nano long period micro-nano fiber grating sensor that 20 period pitch of system are 100 μm, the general single mode micro-nano fiber are to utilize
General single mode is drawn into a diameter of 6.2 μm of micro-nano fiber, and transmitted spectrum is as shown in fig. 2, it can be seen that wherein cardiac wave is a length of
1537.5nm.Another port output of the broad band laser through micro-nano long-period fiber grating sensor 101 enters acousto-optic modulation
The input port of device 102Gooch＆Housego Fiber-Q, the laser signal modulated by acousto-optic modulator 102 is from acousto-optic modulation
The output port of device 102 exports, and exports first coupler 103 of the modulated signal of shift frequency through 3dB and separates two beam signal lights, a branch of
Signal light is through 104 general single mode fiber of the first optical fiber, and length enters the input terminal of the second coupler 106 of 3dB after being 2km, separately
For a branch of signal light through 105 general single mode fiber of the second optical fiber, length enters the input terminal of the second coupler 106 after being 2.1km, this
Two beam signal lights from its output end output signal light, the signal light enter photodetector after being mixed on the second coupler 106
107 input terminal, photodetector 107 are the Finisar XPDV21x0RA of 50GHz, and response wave length is 1528~1564nm,
It is obtained after the processing of signal processing unit 108 by 107 transformed electric signal entering signal processing unit 108 of photodetector
Temperature information on micro-nano long-period fiber grating sensor 101.
The principle of above-mentioned temperature checking method is that the variation of temperature causes micro-nano long-period fiber grating sensor 101 to transmit
The change of wavelength, the phase difference between the first optical fiber 104 and the second optical fiber 105 change, so as to cause into photodetection
The change of the luminous power of device 107 so that the intensity that photodetector 107 exports electric signal changes, due to the strength information
There is quantitative relationship with temperature, can be demarcated in advance, when temperature detection by measure the variation of electrical signal intensity obtain it is to be measured
Temperature.
The frequency spectrum of specific output temperature variation is fig. 3, it is shown that the centre frequency of signal is 199.92MHz, temperature
Signal strength when degree is 35 DEG C is higher than intensity at 30 DEG C, and the relationship between temperature and signal strength is as shown in figure 4, from Fig. 4
As can be seen that as the temperature increases, the intensity of signal linearly increases, slope is 0.46a.u/ DEG C, therefore, according to the rule
After rule is demarcated, it can be passed by measuring the intensity of 107 output signal of photodetector to obtain micro-nano long-period fiber grating
The temperature information that sensor 101 senses.
Embodiment 2：It is roughly the same with 1 temperature-detecting device of embodiment and method, except that the first optical fiber 104 is
The highly nonlinear optical fiber of 1.8km, the second optical fiber 105 are the dispersion shifted optical fiber of 1.2km.
Claims (4)
1. a kind of temperature-detecting device based on micro-nano long-period fiber grating sensor, it is characterised in that：Including being sequentially connected
Wideband light source（100）, micro-nano long-period fiber grating sensor（101）, acousto-optic modulator（102）, the first coupler
（103）, optical fiber, the second coupler（106）, photodetector（107）And signal processing unit（108）, the wideband light source
（100）For the wideband light source that the spontaneous radiation of 1525nm ~ 1565nm wave bands is amplified, the optical fiber includes the first optical fiber（104）With
Second optical fiber（105）, the first coupler（103）Pass through the first optical fiber respectively（104）With the second optical fiber（105）It is connected to the second coupling
Clutch（106）, first optical fiber（104）With the second optical fiber（105）For single mode optical fiber, dispersion shifted optical fiber and high non-linearity light
One or both of fibre.
2. the temperature-detecting device according to claim 1 based on micro-nano long-period fiber grating sensor, feature exist
In：The photodetector（107）For balanced detector, response wave length and wideband light source（100）Wave band is consistent.
3. a kind of temperature checking method based on micro-nano long-period fiber grating sensor, it is characterised in that：Wideband light source（100）
It sends out laser signal and enters micro-nano long-period fiber grating sensor（101）, from micro-nano long-period fiber grating sensor（101）
The laser signal of output enters acousto-optic modulator（102）, through acousto-optic modulator（102）The modulated signal of shift frequency is exported after modulation,
Modulated signal is through the first coupler（103）It is divided into two beam signal lights, passes through the first optical fiber respectively（104）With the second optical fiber（105）
Into the second coupler（106）Laser signal to be analyzed is exported after merging, laser signal to be analyzed is through photodetection
Device（107）Electric signal is converted to, electric signal is through signal processing unit（108）The strength information of its signal is measured, with reference to mark in advance
The quantitative relationship of fixed strength information and temperature obtains temperature information to be measured.
4. the temperature checking method according to claim 3 based on micro-nano long-period fiber grating sensor, feature exist
In：The variation of temperature causes micro-nano long-period fiber grating sensor（101）The change of transmission peak wavelength, the first optical fiber（104）With
Second optical fiber（105）Between phase difference change, cause enter photodetector（107）Luminous power change so that
Photodetector（107）The intensity of output electric signal changes, and testing temperature is waited for by measuring the variation acquisition of its electrical signal intensity.
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| CN108414112A (en) * | 2018-02-08 | 2018-08-17 | 盐城工学院 | A kind of Discrete Production Workshop device temperature monitoring device and method based on Internet of Things |
| CN112881952A (en) * | 2020-12-28 | 2021-06-01 | 国网江西省电力有限公司信息通信分公司 | Magnetic field sensor and preparation method thereof |
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Application publication date: 20161207 Assignee: Dongtai tepusong Machinery Equipment Co.,Ltd. Assignor: Dongtai Chengdong science and Technology Pioneer Park Management Co.,Ltd. Contract record no.: X2023980043158 Denomination of invention: Temperature detection device and method based on micro nano long period fiber grating sensors Granted publication date: 20180828 License type: Common License Record date: 20231012 |
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Application publication date: 20161207 Assignee: Dongtai Donggao Electronic Information Technology Co.,Ltd. Assignor: Dongtai Chengdong science and Technology Pioneer Park Management Co.,Ltd. Contract record no.: X2023980045160 Denomination of invention: Temperature detection device and method based on micro nano long period fiber grating sensors Granted publication date: 20180828 License type: Common License Record date: 20231102 |
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Application publication date: 20161207 Assignee: Dongtai Gaoxin Mechanical Equipment Co.,Ltd. Assignor: Dongtai Chengdong science and Technology Pioneer Park Management Co.,Ltd. Contract record no.: X2023980046304 Denomination of invention: Temperature detection device and method based on micro nano long period fiber grating sensors Granted publication date: 20180828 License type: Common License Record date: 20231110 |