CN102507449A - Temperature-insensitive light source self-correcting humidity sensor based on TFBG (tilted fiber Bragg grating) - Google Patents
Temperature-insensitive light source self-correcting humidity sensor based on TFBG (tilted fiber Bragg grating) Download PDFInfo
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- CN102507449A CN102507449A CN2011103881515A CN201110388151A CN102507449A CN 102507449 A CN102507449 A CN 102507449A CN 2011103881515 A CN2011103881515 A CN 2011103881515A CN 201110388151 A CN201110388151 A CN 201110388151A CN 102507449 A CN102507449 A CN 102507449A
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Abstract
The invention relates to a temperature-insensitive light source self-correcting humidity sensor based on a TFBG (tilted fiber Bragg grating), which is manufactured byapplying the principle that a Bragg mode reflected by a tilted fiber Bragg grating is not modulated by external humidity while a cladding mode reflected by the tilted fiber Bragg grating is modulated by the external humidity. The temperature-insensitive light source self-correcting humidity sensor comprises a light source, a three-port optical circulator, a biconical fiber, a single mode fiber carved with the tilted fiber Bragg grating, a 1X2 fiber coupler, two optical filters, two photoelectric diodes and a data processing module. The cladding mode and the Bragg mode returned from the tilted fiber Bragg grating enter a fiber core for transmission after being coupled by the biconical fiber, and are respectively converted into analog electric signals to enter the data processing module, so that external humidity information is obtained by measuring the strength ratio of the cladding mode and the Bragg mode. By means of the characteristic that the Bragg reflection mode of the tilted fiber Bragg grating is not affected by the humidity, the influence of fluctuation of the light source on measuring results can be effectively avoided, external temperature change only affects small- range drifting of the wavelength of a reflection spectrum, and the influence of the temperature change on measurement can be effectively avoided.
Description
Technical field
The invention belongs to technical field of optical fiber sensing, be specifically related to a kind of light source self-correction humidity sensor based on the TFBG temperature-insensitive.
Background technology
Human existence and social activities and humidity are closely related.Along with modern realization, be difficult to find out a field that has nothing to do with humidity.In departments such as workers and peasants' production, meteorology, environmental protection, national defence, scientific research, space flight, often need measure and control ambient humidity.But in the environmental parameter of routine, humidity is the most difficult parameter of accurately measuring.See from making angle, be both humidity sensor, material, structure difference, technology is different, and its performance and technical indicator have very big-difference.Humidity measuring is than measuring the many of temperature complicacy; Temperature is individual independently measured; And humidity receives the influence of other factors (temperature), so come the method for humidity measuring can't satisfy the needs of modern development in science and technology with resistive moisture sensor and capacitive moisture sensor.
Fibre Optical Sensor has anti-electromagnetic interference (EMI), it is microminiaturized, corrosion-resistant to be prone to, measuring accuracy is high, be suitable under the inflammable and explosive environment use and stablize advantage such as sensing at a distance.At present; Humidity sensor based on optical fiber utilizes plastic optical fiber, Fiber Bragg Grating FBG (FBG) and LPFG (LPG) and slant optical fiber grating (TFBG) etc.; (patent No.: ZL200810053342.4), its shortcoming is to solve the cross sensitivity effect that temperature and light source fluctuation cause to the patent of invention of having authorized based on the relative air humidity measuring instrument of inclined optical fiber grating.
Summary of the invention
The purpose of this invention is to provide a kind of light source self-correction humidity sensor, to solve the cross sensitivity effect that light fibre humidity transducer temperature and light source fluctuation cause based on the TFBG temperature-insensitive.
The light source self-correction humidity sensor of described temperature-insensitive based on TFBG; It is characterized in that comprising light source, three ports light rings, double-tapered fiber, humidity sensitive material, the single-mode fiber that is carved with inclined optical fiber grating, 1 * 2 fiber coupler, two optical filters, two photodiodes and data processing module; The two ends of double-tapered fiber respectively with the single-mode fiber of standard and the single-mode fiber welding without acceptance of persons of being carved with inclined optical fiber grating; Constitute the sensing probe of sensing device; The a end of described three ports light rings links to each other with light source; The b end links to each other with sensing probe; The c end links to each other with an input port of 1 * 2 fiber coupler; First output port of 1 * 2 fiber coupler links to each other with an input end of data processing module through first optical filter, first photodiode successively, and second output port of 1 * 2 fiber coupler links to each other with another input end of data processing module through second optical filter, second photodiode successively, and described humidity sensitive coated materials is on the surface of the single-mode fiber that is carved with inclined optical fiber grating.
The light source self-correction humidity sensor of described temperature-insensitive based on TFBG is characterized in that described light source is that to adopt wavelength be the smooth wideband light source of 1520nm-1560nm scope.
The light source self-correction humidity sensor of described temperature-insensitive based on TFBG; It is characterized in that described first optical filter is that wavelength is the cladding mode optical filter of 1535nm-1545nm, isolation＞20dB reflection, second optical filter is that wavelength is Prague mould optical filter of 1545nm-1547nm, isolation＞20dB reflection.
The advantage of patent of the present invention is: utilize Prague mould of the reflection of inclined optical fiber grating not receive the characteristic of humidity effect; Can avoid the influence of light source power fluctuation to measurement result; Simultaneously ambient temperature changes that the wavelength that only influences reflectance spectrum drifts about among a small circle and spectral intensity is constant; Can avoid the influence of temperature variation, obtain a kind of temperature-insensitive that has, the light fibre humidity transducer of light source self-correction measuring.
Description of drawings
Fig. 1 is the structural representation of light source self-correction humidity sensor that the present invention is based on the temperature-insensitive of TFBG.
Embodiment
Below in conjunction with Figure of description the present invention is further specified:
As shown in Figure 1; Humidity sensor based on the temperature-insensitive of inclined optical fiber grating; Comprise light source 1, three port light circulators 2, double-tapered fiber 3, the single-mode fiber 4 that is carved with inclined optical fiber grating, humidity sensitive material 5,1 * 2 fiber coupler 6, two 7,8, two photodiodes 9,10 of optical filter and data processing modules 11; The two ends of said double-tapered fiber respectively with the single-mode fiber of standard and single-mode fiber 4 welding without acceptance of persons of being carved with inclined optical fiber grating; Constitute the sensing probe of sensing device; The a end of described three ports light rings links to each other with light source 1; B end links to each other with sensing probe, and the c end links to each other with an input port of 1 * 2 fiber coupler 6, and 1 * 2 fiber coupler, 6 first output ports warp first optical filter 7, first photodiode 9 successively link to each other with an input end of data processing module 11; 6 second output ports of 1 * 2 fiber coupler link to each other with another input end of data processing module 11 through second optical filter 8, second photodiode 10 successively, and described humidity sensitive material 5 is coated in the surface of the single-mode fiber 4 that is carved with inclined optical fiber grating.
The working method of apparatus of the present invention is: the light that light source sends is input to three ports light rings through a port of three port light circulators; Due to the self-characteristic of Three-port circulator; Light is by the output of b port and further be input in the double-tapered fiber; Finally be transferred to inclined optical fiber grating; The inclined optical fiber grating reflected light is made up of Prague mould and many cladding modes, through double-tapered fiber these cladding modes is coupled in the fibre core of single-mode fiber again, and the light that reflects is through the output of the c of three ports light rings end.The cladding mode light signal that sensing probe returns converts the cladding mode flashlight to simulating signal and gets into data processing module through three ports light rings, 1 * 2 fiber coupler, first optical filter and first photodiode; Prague mould that sensing probe returns converts Prague mould flashlight to simulating signal and gets into data processing module through three ports light rings, 1 * 2 fiber coupler, second optical filter and second photodiode.Data processing module is handled the two-way photosignal of input, calculates corresponding humidity value according to the amplitude relation of two-way photosignal, and this ratio is realized light source self-correction not with the light source amplitude fluctuations.
In the present embodiment, the double-tapered fiber length of selecting for use is 1mm, and mid diameter is 70 μ m, and double tapered angle is 15 °; The about 2-3cm of grid region length of inclined optical fiber grating, grating fringe and shaft axis of optic fibre angle are 3 °-8 °, and the grating cycle is 1066 μ m.
Claims (3)
1. based on the light source self-correction humidity sensor of the temperature-insensitive of TFBG; It is characterized in that comprising light source (1), three ports light rings (2), double-tapered fiber (3), the single-mode fiber (4) that is carved with inclined optical fiber grating, humidity sensitive material (5), 1 * 2 fiber coupler (6), two optical filters (7), (8), two photodiodes (9), (10) and data processing module (11); The two ends of said double-tapered fiber respectively with the single-mode fiber of standard and single-mode fiber (5) welding without acceptance of persons of being carved with inclined optical fiber grating; Constitute the sensing probe of sensing device; The a end of described three ports light rings links to each other with light source (1); The b end links to each other with sensing probe; The c end links to each other with an input port of 1 * 2 fiber coupler (6); First output port of 1 * 2 fiber coupler (6) links to each other with an input end of data processing module (11) through first optical filter (7), first photodiode (9) successively; (6) second output ports of 1 * 2 fiber coupler link to each other with another input end of data processing module (11) through second optical filter (8), second photodiode (10) successively, and described humidity sensitive material (5) is coated in the surface of the single-mode fiber (4) that is carved with inclined optical fiber grating.
2. the light source self-correction humidity sensor of the temperature-insensitive based on TFBG according to claim 1 is characterized in that described light source (1) is that to adopt wavelength be the smooth wideband light source of 1520nm-1560nm scope.
3. the light source self-correction humidity sensor of the temperature-insensitive based on TFBG according to claim 1; It is characterized in that described first optical filter (7) is that wavelength is 1535nm-1545nm, isolation＞20dB reflection cladding mode optical filter, second optical filter (8) is that wavelength is 1545nm-1547nm, isolation＞20dB reflection Prague mould optical filter.
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Cited By (3)
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| CN103033489A (en) * | 2012-12-14 | 2013-04-10 | 中国计量学院 | PH value sensor based on tilted fiber Bragg grating girdle amplification welding technology |
| CN103592261A (en) * | 2013-11-20 | 2014-02-19 | 天津大学 | All-fiber temperature compensating gas sensor and compensating method thereof |
| CN106768268A (en) * | 2016-11-18 | 2017-05-31 | 电子科技大学 | The optical fiber vibration sensing system that a kind of low reflection oblique raster array is combined with Φ OTDR |
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| CN202393696U (en) * | 2011-11-29 | 2012-08-22 | 中国计量学院 | Temperature-insensitive light source self-correcting humidity sensor based on TFBG (tilted fiber Bragg grating) |
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| EP1626259A1 (en) * | 2004-08-12 | 2006-02-15 | Agilent Technologies, Inc. | Optical sensing of a physical parameter |
| JP2009063390A (en) * | 2007-09-06 | 2009-03-26 | Fiberlabs Inc | Optical fiber humidity sensor and humidity detection system using it |
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| CN103033489A (en) * | 2012-12-14 | 2013-04-10 | 中国计量学院 | PH value sensor based on tilted fiber Bragg grating girdle amplification welding technology |
| CN103592261A (en) * | 2013-11-20 | 2014-02-19 | 天津大学 | All-fiber temperature compensating gas sensor and compensating method thereof |
| CN103592261B (en) * | 2013-11-20 | 2016-03-30 | 天津大学 | All-optical fiber temperature offset-type gas sensor and compensation method thereof |
| CN106768268A (en) * | 2016-11-18 | 2017-05-31 | 电子科技大学 | The optical fiber vibration sensing system that a kind of low reflection oblique raster array is combined with Φ OTDR |
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Application publication date: 20120620 |