CN201463922U - Multi-fiber grating sensor demodulator - Google Patents
Multi-fiber grating sensor demodulator Download PDFInfo
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- CN201463922U CN201463922U CN2009200782944U CN200920078294U CN201463922U CN 201463922 U CN201463922 U CN 201463922U CN 2009200782944 U CN2009200782944 U CN 2009200782944U CN 200920078294 U CN200920078294 U CN 200920078294U CN 201463922 U CN201463922 U CN 201463922U
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Abstract
The utility model relates to a multi-fiber grating sensor demodulator, which comprises an adjustable fiber laser, a wavelength discriminator, a preceding-stage fiber coupler, an optical isolator, at least four photoelectric detectors, at least four backward-stage fiber couplers, at least four sensor testing ports, a data acquisition card, a computer processor and a display. Each sensor testing port comprises a fiber Prague grating sensor testing port, a chatter fiber grating sensor testing port and a long-period fiber grating sensor testing port. A plurality of fiber Prague grating sensors, a plurality of chatter fiber grating sensors and a plurality of long-period fiber grating sensors can be simultaneously measured on the same sensor demodulator.
Description
Technical field
The utility model relates to a kind of sensor (FBG) demodulator, especially relates to a kind of many fiber-optic grating sensors (FBG) demodulator, is specially adapted to the characteristic of measuring optical fiber grating sensor.
Background technology
Fiber grating is a kind of novel optical fiber passive device, comes out so far from 1978, and many in the world scientific researches and engineering technical personnel join in the development and application work of fiber grating, and relative various technology have obtained very great development.Studying the successful ultraviolet based on mask plate in 1989 writes manufacturing technology and makes the mass production of fiber grating and industrial applications become possibility.Now, fiber grating has been widely used among optical fiber communication and the sensory field.In sensor field, it is sensing mechanism based on optical wavelength and bandwidth that fiber-optic grating sensor has (1), makes measuring-signal not be subjected to factor affecting such as intensity of light source fluctuation, fibre-optical bending, optical fiber junction loss and detector sensitivity variation; (2) can use wavelength-division multiplex technique in an optical fiber, to be connected in series a plurality of fiber-optic grating sensors, simultaneously a plurality of measurement points, a plurality of physical quantity be carried out accurate distribution measuring; (3) volume little, in light weight, be not subjected to electromagnetic interference (EMI), essential safety.So fiber grating has been applied to making the sensors such as temperature, strain, pressure, displacement, vibration, sound and magnetic field of high precision, high reliability, plays an important role in a plurality of fields such as aviation, boats and ships, electric power, petrochemical complex and medical science.
Fiber-optic grating sensor is based on the reflectance spectrum of fiber grating or transmission spectrum to the measurement of various physical quantitys characteristic realizes with this characteristic of change of physical quantity.Therefore, make the fiber-optic grating sensor (FBG) demodulator, to the reflectance spectrum of fiber grating or the transmission spectrum characteristic is measured and be inevitable important technology in the fiber-optic grating sensor system with the value that its characterisitic parameter is demodulated to the physical quantity of surveying.At present, people design and produce out the fiber-optic grating sensor (FBG) demodulator with several different methods.Yet these (FBG) demodulators have plenty of specially at the fiber Bragg grating sensor design, are not suitable for the measurement of long-period fiber grating sensor.And generally only measure the wavelength of grating at the (FBG) demodulator of fiber Bragg grating sensor design, and do not measure the bandwidth of grating, so be not suitable for those are changed to mechanism with measurand based on bandwidth chirped fiber grating sensor.Have plenty of specially at the long-period fiber grating sensor design, be not suitable for the measurement of fiber Bragg grating sensor and chirped fiber grating sensor.General spectroanalysis instrument can the measuring optical fiber Bragg grating sensor, the wavelength and the bandwidth of chirped fiber grating sensor and long-period fiber grating sensor, but its measuring speed is slow, only is applicable to the static properties of survey sensor.Therefore, present fiber-optic grating sensor (FBG) demodulator does not also possess the static state of measuring optical fiber Bragg grating sensor, chirped fiber grating sensor and long-period fiber grating sensor and the function of dynamic property simultaneously.
Summary of the invention
Possess the static state of measuring optical fiber Bragg grating sensor, chirped fiber grating sensor and long-period fiber grating sensor and the purpose of dynamic property simultaneously in order to reach a fiber-optic grating sensor (FBG) demodulator, the utility model provides a kind of novel fiber grating sensor (FBG) demodulator, with the wavelength and the bandwidth of fiber grating in the same (FBG) demodulator survey sensor, with (FBG) demodulator simultaneously can the measuring optical fiber Bragg grating sensor, the static state and the dynamic property of chirped fiber grating sensor and long-period fiber grating sensor.
The utility model to achieve the above object, provide a kind of many fiber-optic grating sensors (FBG) demodulator it be included as LASER Light Source, the prime fiber coupler that is connected with light beam with LASER Light Source light beam output terminal, optoisolator and the photodetector that is connected with light beam with prime fiber coupler light beam output terminal respectively, the data collecting card that is electrically connected with photodetector, the computer processor that is connected with the data collecting card output terminal, the display that is connected with the computer processor output terminal, being connected with optoisolator light beam output terminal is equipped with the back level fiber coupler of test port on the light beam output terminal that is connected with light beam, and the sensor test port; Also comprise the wavelength determinant on the light path that places between prime fiber coupler and the photodetector, described LASER Light Source is the adjustable optic fibre laser instrument, described photodetector has 4 at least, and described back level fiber coupler has 4 at least, and described sensor test port has 4 at least.
Described sensor test port comprises the fiber Bragg grating sensor test port, chirped fiber grating sensor test port and long-period fiber grating sensor test port.
The utility model has been compared significant benefit with existing fiber-optic grating sensor (FBG) demodulator.
As above-mentioned structure, sensor (FBG) demodulator of the present utility model comprises at least 4 photodetectors, level fiber coupler after at least 4, at least 4 sensor test ports.In described sensor test port, comprise the fiber Bragg grating sensor test port, chirped fiber grating sensor test port and long-period fiber grating sensor test port.So the utility model sensor (FBG) demodulator simultaneously can the measuring optical fiber Bragg grating sensor, the characteristic of chirped fiber grating sensor and long-period fiber grating sensor.Promptly on same sensor (FBG) demodulator, can measure a plurality of fiber Bragg grating sensors, chirped fiber grating sensor and long-period fiber grating sensor simultaneously.
As above-mentioned structure, sensor (FBG) demodulator of the present utility model comprises the wavelength determinant on the light path that places between prime fiber coupler and the photodetector, and described LASER Light Source is the adjustable optic fibre laser instrument.So the wavelength of the utility model sensor (FBG) demodulator and equal scalable of cycle, not only have high s/n ratio, high resolution, high measurement frequency and big these advantages of range of dynamic measurement, when reaching higher survey frequency, also have very high range of dynamic measurement, can be used for the static state and the dynamic property of accurate measuring optical fiber grating sensor.
As above-mentioned structure, sensor (FBG) demodulator of the present utility model also is different from general spectrometer, and the static parameter that sensor (FBG) demodulator of the present utility model not only can the measuring optical fiber grating also can be measured dynamic parameter.
As above-mentioned structure, the LASER Light Source of the utility model sensor (FBG) demodulator is the adjustable optic fibre laser instrument and is furnished with the wavelength determinant, when improving sensor (FBG) demodulator precision, also simplified in the sensor (FBG) demodulator computer processor to the handling procedure of wavelength.
Description of drawings
Fig. 1 is the structural representation of many fiber-optic grating sensors (FBG) demodulator one embodiment of the present utility model;
Among Fig. 1: 1 is LASER Light Source; 2 is the prime fiber coupler; 3 is the optical wavelength determinant; 4 is optoisolator; 5,6,7,8 is back level fiber coupler; 9,10,11,12 is the sensor test port, wherein 9 is the fiber Bragg grating sensor test port, 10 is chirped fiber grating sensor test port, and 11 is long-period fiber grating sensor test lead light delivery outlet, and 12 is long-period fiber grating sensor test lead optical input; 13,14,15,16 is photodetector; 17 is data collecting card; 18 is computer processor; 19 is display.
Fig. 2 is the structural representation of adjustable optic fibre laser instrument one embodiment in many fiber-optic grating sensors (FBG) demodulator of the present utility model;
Among Fig. 2: 20 is pump laser, and 21 is wavelength division multiplexer, and 22 is Er-doped fiber, and 23 is fiber coupler, and 24 is arrowband adjustable optic fibre wave filter, and 25 is the front end optoisolator, and 26 is the rear end optoisolator, and 27 is arrowband adjustable optic fibre wave filter driver.
Fig. 3 is the structural representation of optical wavelength determinant one embodiment in many fiber-optic grating sensors (FBG) demodulator of the present utility model;
Among Fig. 3: 28 is first fiber coupler, and 29 for passband centre wavelength is short wavelength's short wavelength light fiber filter, and 30 for passband centre wavelength is long wavelength's longwave optical fiber filter, and 31 is second fiber coupler.
Fig. 4 is that fiber-optic grating sensor (FBG) demodulator of the present utility model is in the connection diagram that is applied to measuring fiber grating sensor characteristic test one embodiment;
Among Fig. 4: 32 is fiber Bragg grating sensor, 33 is fiber Bragg grating sensor, 34 is fiber Bragg grating sensor, 35 is the chirped fiber grating sensor, 36 is the chirped fiber grating sensor, and 37 is the chirped fiber grating sensor, and 38 is long-period fiber grating sensor, 39 is long-period fiber grating sensor, and 40 is long-period fiber grating sensor.
Embodiment
Architectural feature below in conjunction with many fiber-optic grating sensors of description of drawings the utility model (FBG) demodulator.
As shown in Figure 1, many fiber-optic grating sensors (FBG) demodulator of the present utility model is included as LASER Light Source 1, the prime fiber coupler 2 that is connected with light beam with LASER Light Source 1 light beam output terminal, optoisolator 4 and the wavelength determinant 3 that is connected with light beam with prime fiber coupler 2 light beam output terminals respectively, the photodetector 15 that is connected with light beam with wavelength determinant 3 light beam output terminals, the data collecting card 17 that is electrically connected with photodetector 15, the computer processor 18 that is connected with data collecting card 17 output terminals, the display 19 that is connected with computer processor 18 output terminals;
As shown in Figure 1, comprise in the present embodiment: 4 photodetectors 13,14,15,16; Level fiber coupler 5,6,7,8 after 4; 4 sensor test ports 9,10,11,12, the wherein 11 and 12 common test ports of forming a long-period fiber grating sensor.Wherein level fiber coupler 5 in back is connected with the light beam output terminal of optoisolator 4 with light beam, back level fiber coupler 6 is connected with the light beam output terminal of light beam with back level fiber coupler 5, and back level fiber coupler 7,8 is connected with back level fiber coupler 6 with light beam respectively; Sensor test port 9 is connected with light beam with back level fiber coupler 8 for the fiber Bragg grating sensor test port; Sensor test port one 0 is connected with light beam with back level fiber coupler 7 for chirped fiber grating sensor test port; Sensor test port one 1 is connected with light beam with back level fiber coupler 5 for long-period fiber grating sensor test lead light delivery outlet; Sensor test port one 2 is connected with light beam with photodetector 16 for long-period fiber grating sensor test lead optical input; Photodetector 13 and back level fiber coupler 8 are connected with light beam; Photodetector 14 and back level fiber coupler 7 are connected with light beam; Photodetector 13,14,15,16) all is electrically connected with data collecting card 17.
As shown in Figure 1, in the present embodiment, the cycle of described long-period fiber grating sensor is between 60 μ m～1000 μ m; The cycle of described fiber Bragg grating sensor and chirped fiber grating sensor is 1 μ m magnitude, is the short period.
In the present embodiment, described LASER Light Source 1 is the adjustable optic fibre laser instrument.Structure as shown in Figure 2.
The light that LASER Light Source 1 is sent is through prime fiber coupler 2, and a part enters optical wavelength determinant 3, and another part enters back level fiber coupler 5 by optoisolator 4; Be divided into two parts by optoisolator 4 to the light of back level fiber coupler 5, a part enters back level fiber coupler 6, another part is shone outside the (FBG) demodulator by long-period fiber grating sensor test lead light delivery outlet 11, light source as test long-period fiber grating sensor characteristic. the light that back level fiber coupler 6 will enter is divided into two parts, wherein a part of light enters back level fiber coupler 7, shine outside the (FBG) demodulator by chirped fiber grating sensor test port one 0, as the light source of test chirped fiber grating sensor characteristic; Another part light enters back level fiber coupler 8, shines outside the (FBG) demodulator by fiber Bragg grating sensor test port 9, as measuring fiber Bragg grating sensor light source; When the measuring fiber Bragg grating sensor, the effect that one of sensor terminates at fiber Bragg grating sensor test port 9. fiber Bragg grating sensors of instrument is that the light that will incide some specific wavelength in the grating reflects back it is transmitted no longer forward, if the light in a broadband incides in the Fiber Bragg Grating FBG, then the light that is in the optical grating reflection bandwidth of wavelength is reflected, the light of other wavelength can continue transmission forward by grating, all light intensities of optical grating reflection are shown that by the wavelength order just forming grating reflection composes. the light of sensor test port 9 outgoing also is the laser of smaller bandwidth, can be similar to the light of regarding single wavelength as, if light wavelength periodicity linearity in time increases gradually. the optical wavelength of outgoing is in the Fiber Bragg Grating FBG reflection bandwidth in a certain moment, then the light of this wavelength is owing to the effect of grating is reflected, incide photodetector 13 by back level fiber coupler 8, if at this moment the light intensity that receives of photodetector 13 is higher. the optical wavelength of outgoing is not in the optical grating reflection bandwidth in a certain moment, then the light of this wavelength is not subjected to the influence of grating to continue transmission forward, this the time be engraved in photodetector 13 light intensity for very weak. photodetector 13 is converted to the light signal that receives and is gathered by data collecting card 17 (being A/D converter in the present embodiment) behind the electric signal and become digital signal to be input in the computer processor 18 analog signal conversion. the intensity that is input to all electric signal constantly in the computer processor in the one-period is shown in chronological order, then can obtain the reflectance spectrum of optical fiber Bragg fiber-optic grating sensor, because the corresponding light intensity of the intensity of electric signal, corresponding light wavelength constantly.
When test chirped fiber grating sensor, one of sensor terminates at the chirped fiber grating sensor test port one 0 of instrument.The effect of chirped fiber grating is that the light that will incide some specific wavelength in the grating reflects back it is transmitted no longer forward, if in the broadband light incident long period fiber grating, then the light that is in the optical grating reflection bandwidth of wavelength is reflected, the light of other wavelength can continue transmission forward by grating, all light intensities of optical grating reflection is shown by the wavelength order just form the grating reflection spectrum.In general, compare with Fiber Bragg Grating FBG, it is big that the reflection bandwidth of chirped fiber grating is wanted.The light of sensor test port one 0 outgoing also is the laser of smaller bandwidth, can be similar to the light of regarding single wavelength as, and light wavelength periodicity linearity in time increases gradually.If the optical wavelength of outgoing is in the chirped fiber grating reflection bandwidth in a certain moment, then the light of this wavelength is owing to the effect of grating is reflected, incide photodetector 14 by a back level fiber coupler 7, at this moment photodetector 14 receive light intensity higher.If the optical wavelength of outgoing is not in the optical grating reflection bandwidth in a certain moment, then the influence that is not subjected to grating of the light of this wavelength continues transmission forward, this time be engraved in the light intensity of photodetector 14 for very weak.Photodetector 14 is converted to the light signal that receives and is gathered by data collecting card 17 behind the electric signal and become digital signal to be input in the computer processor 18 analog signal conversion.The intensity that is input to all electric signal constantly in the computer processor in the one-period is shown in chronological order, then can obtain the reflectance spectrum of chirped fiber fiber-optic grating sensor, because the corresponding light intensity of the intensity of electric signal, corresponding light wavelength constantly.
When test long-period fiber grating sensor characteristic, one of sensor terminates at the long-period fiber grating sensor test lead light delivery outlet 11 of instrument, thereby the other end be connected on the effect of long-period fiber grating sensor test lead optical input 12. long period fiber grating of instrument be will incide the light of some specific wavelength in the grating be coupled to fibre cladding from fiber core and lose transmission no longer forward, if in the broadband light incident long period fiber grating, then wavelength is in the light that grating does in the dedicated bandwidth and is depleted, the light of other wavelength can continue transmission forward by grating, behind grating, all light intensities are shown the transmission spectrum that just forms grating by the wavelength order. the laser of the only smaller bandwidth of sensor test port one 1 outgoing, can be similar to the light of regarding single wavelength as, if light wavelength periodicity linearity in time increases gradually. the optical wavelength of interior outgoing of a certain moment is in long period fiber grating and does in the dedicated bandwidth, then the effect owing to grating of the light of this wavelength is depleted, if the light intensity when this constantly incides light intensity heel end mouth 11 outgoing of photodetector 16 by port one 2 is compared very weak. the optical wavelength of outgoing is not in long period fiber grating is made dedicated bandwidth in a certain moment, then the influence that is not subjected to grating of the light of this wavelength continues transmission forward, stronger in this moment by the light intensity that port one 2 incides photodetector 16, light intensity during 11 outgoing of heel end mouth is close. and photodetector 16 is converted to the light signal that receives and is gathered by data collecting card 17 behind the electric signal and become digital signal to be input in the computer processor 18 analog signal conversion, the intensity that is input to all electric signal constantly in the computer processor in the one-period is shown in chronological order, then can obtain the transmission spectrum of long-period fiber grating sensor, because the corresponding light intensity of the intensity of electric signal, corresponding light wavelength of the moment. after having obtained the transmission spectrum or reflectance spectrum of fiber-optic grating sensor after tested, the characterisitic parameter that just can draw fiber-optic grating sensor is centre wavelength and bandwidth. for optical fiber Bragg fiber grating or chirped fiber grating sensor, 2 the wavelength difference that light intensity value is at the highest notch and minimum point is middle in its reflectance spectrum is exactly the reflection bandwidth of sensor, the wavelength that is in the some correspondence of this two dot center is exactly the centre wavelength of sensor. for long-period fiber grating sensor, 2 the wavelength difference that light intensity value is at the highest notch and minimum point is middle in its transmission spectrum is exactly the transmission bandwidth of sensor, the wavelength that is in the some correspondence of this two dot center is exactly the centre wavelength of sensor. like this, just tested the optical fiber Bragg fiber grating, chirped fiber grating grating and long-period fiber grating sensor centre wavelength and bandwidth, be presented on the display 19 of (FBG) demodulator, the frequency of test is identical with the frequency of adjustable optic fibre laser scans. generally speaking, the mechanism that the centre wavelength that fiber Bragg grating sensor and long-period fiber grating sensor are based on grating changes with measurand designs, the mechanism that the grating reflection bandwidth changes with measurand of being based on the chirped fiber grating sensor designs. obtained the centre wavelength or bandwidth of grating in test after, the relation of fiber grating characterisitic parameter and measurand in just can sensor calculates the value of measurand.
Fig. 2 is the structural representation of adjustable optic fibre laser instrument one embodiment in many fiber-optic grating sensors (FBG) demodulator of the present utility model.As shown in Figure 2, in the present embodiment, described LASER Light Source 1 is the adjustable optic fibre laser instrument.Described adjustable optic fibre laser instrument 1 comprises pump laser 20, wavelength division multiplexer 21, and Er-doped fiber 22, fiber coupler 23 has the arrowband adjustable optic fibre wave filter 24 of driver 27, front and back ends optoisolator 25,26; Enter Er-doped fiber 22 by pump laser 20 emitted laser bundles through wavelength division multiplexer 21, the broadband spontaneous emission light that Er-doped fiber 22 produces enters arrowband adjustable optic fibre wave filter 24 through wavelength division multiplexer 21 and fiber coupler 23, enter Er-doped fiber 22 once more behind the narrow band light process front end optoisolator 25 by arrowband adjustable optic fibre wave filter 24, outgoing is the exciting light of fiber laser, at last from rear end optoisolator 26 output laser of narrowband light beams.
Structure as Fig. 2, the broadband spontaneous emission light that is produced by Er-doped fiber 22 enters arrowband adjustable optic fibre wave filter 24 through wavelength division multiplexer 21 and fiber coupler 23, narrow band light in arrowband adjustable filter pass band width is transmitted forward by this wave filter 24, and other light all is depleted.Narrow band light by wave filter 24 enters Er-doped fiber once more through front end optoisolator 25, becomes the exciting light of fiber laser.Like this, just constituted the adjustable optic fibre laser instrument by exciting light, pumping laser and active material Er-doped fiber.What sent by the adjustable optic fibre laser instrument is the narrow band light of high-energy-density, and light wavelength is identical with the excitation light wavelength, and promptly the passband wavelength with the arrowband adjustable filter is identical.The laser major part that fiber laser sends is through fiber coupler 23,26 outputs of rear end optoisolator, and fraction is got back to Er-doped fiber as exciting light by arrowband adjustable optic fibre wave filter, optoisolator and wavelength division multiplexer again.Can regulate the passband wavelength of arrowband adjustable optic fibre wave filter 24 by optical fiber filter driver 27, thereby regulate the output wavelength of fiber laser, form the fiber laser of wavelength-tunable.The adjustable optic fibre laser instrument sends Wavelength of Laser in time by the linear gradually long wavelength who is increased to setting of the short wavelength who sets, and then the short wavelength who gets back to setting by the long wavelength who sets, so periodic cycle scanning.Here claim that the short wavelength who sets is the initial wavelength of laser scans, the long wavelength of setting is the cutoff wavelength of laser scans, and the cycle of scanning is exactly the frequency that (FBG) demodulator is measured.
Fig. 3 is the structural representation of optical wavelength determinant one embodiment in many fiber-optic grating sensors (FBG) demodulator of the present utility model. as shown in Figure 3, described wavelength determinant 3 comprises first, second fiber coupler 28,31, short wavelength light fiber filter 29 and longwave optical fiber filter 30; Light beam penetrates from first fiber coupler 28, through penetrating by second fiber coupler 31 after short wavelength light fiber filter 29 or 30 filtering of longwave optical fiber filter.
As shown in Figure 3, passband centre wavelength be the long wavelength for longwave optical fiber filter 30; Passband centre wavelength be the short wavelength for short wavelength light fiber filter 29.No matter be the passband central wavelength lambda of short wavelength light fiber filter 29
SPassband central wavelength lambda with longwave optical fiber filter 30
LAll be in the optical wavelength range of adjustable optic fibre laser scans, and respectively near the initial wavelength and the cutoff wavelength of laser scans wavelength.In the present embodiment, passband center long wavelengths
LBe 1560-1568nm; Passband center short wavelength λ
SBe 1522-1530nm.If the adjustable optic fibre laser instrument sends light and enters short wavelength light fiber filter 29 or longwave optical fiber filter 30 simultaneously after by first fiber coupler 28, if light wavelength is not in the pass band width of two wave filters, light can not pass through wave filter so, and second fiber coupler 31 does not just have light output.If light wavelength is in the pass band width of short wavelength light fiber filter 29, light can pass through short wavelength light fiber filter 29 so, and by 31 outputs of second fiber coupler.If light wavelength is in the pass band width of longwave optical fiber filter 30, light can pass through longwave optical fiber filter 30 so, and by 31 outputs of second fiber coupler.Be converted to behind the electric signal to be gathered by data collecting card 17 by photodetector 15 by the light of optical wavelength determinant output and become digital signal in computer processor 18 through analog signal conversion, computer processor judges that according to this signal the adjustable optic fibre laser instrument sends light wavelength constantly at each.Here the adjustable optic fibre laser instrument is sent laser and be labeled as t by computer processor by the moment that capture card obtains by short wavelength light fiber filter 29 backs
S, be labeled as t by longwave optical fiber filter 30 and by the moment that computer processor obtains
LThen at t
SAnd t
LBetween moment t, the wavelength X that the adjustable optic fibre laser instrument sends is
Fig. 4 is that fiber-optic grating sensor (FBG) demodulator of the present utility model is in the connection diagram that is applied to measuring fiber grating sensor characteristic test one embodiment.As shown in Figure 4, on sensor test port 9, connecting fiber Bragg grating sensor 32, fiber Bragg grating sensor 33, fiber Bragg grating sensor 34 etc. with light beam; On sensor test port one 0, connecting chirped fiber grating sensor 35, chirped fiber grating sensor 36, chirped fiber grating sensor 37 etc. with light beam; Sensor test port one 1,12 is connecting long-period fiber grating sensor 38, long-period fiber grating sensor 39, long-period fiber grating sensor 40 etc. with light beam.As seen from Figure 4, a sensor test port in the utility model can be connected simultaneously and be measured a plurality ofly with a kind of grating sensor, can measure a plurality of fiber Bragg grating sensors, chirped fiber grating sensor and long-period fiber grating sensor simultaneously on same sensor (FBG) demodulator.
In a word, the function that can carry out kinetic measurement, demodulation to the characteristic of long-period fiber grating sensor, fiber Bragg grating sensor and chirped fiber grating sensor simultaneously based on many fiber-optic grating sensors (FBG) demodulator realization of adjustable optic fibre laser instrument provided by the utility model is for fiber Bragg grating sensor, chirped fiber grating sensor and long-period fiber grating sensor provide a kind of high performance novel (FBG) demodulator.
Claims (4)
1. fiber-optic grating sensor (FBG) demodulator more than a kind, comprise LASER Light Source, the prime fiber coupler that is connected with light beam with LASER Light Source light beam output terminal, optoisolator and the photodetector that is connected with light beam with prime fiber coupler light beam output terminal respectively, the data collecting card that is electrically connected with photodetector, the computer processor that is connected with the data collecting card output terminal, the display that is connected with the computer processor output terminal, the back level fiber coupler and the sensor test port that are connected with light beam with optoisolator light beam output terminal, it is characterized in that comprising the wavelength determinant on the light path that places between prime fiber coupler and the photodetector, described LASER Light Source is the adjustable optic fibre laser instrument, described photodetector has 4 at least, described back level fiber coupler has 4 at least, and described sensor test port has 4 at least.
2. many fiber-optic grating sensors (FBG) demodulator according to claim 1 is characterized in that described sensor test port comprises fiber Bragg grating sensor test port, chirped fiber grating sensor test port and long-period fiber grating sensor test port.
3. many fiber-optic grating sensors (FBG) demodulator according to claim 1 is characterized in that described wavelength determinant comprises first, second fiber coupler, short wavelength light fiber filter and longwave optical fiber filter; Light beam penetrates from first fiber coupler, through penetrating by second fiber coupler after short wavelength light fiber filter or the filtering of longwave optical fiber filter.
4. many fiber-optic grating sensors (FBG) demodulator according to claim 1 is characterized in that described adjustable optic fibre laser instrument comprises pump laser, wavelength division multiplexer, Er-doped fiber, fiber coupler has the arrowband adjustable optic fibre wave filter of driver, front and back ends optoisolator; Enter Er-doped fiber by pump laser emitted laser bundle through wavelength division multiplexer, the broadband spontaneous emission light that Er-doped fiber produces enters arrowband adjustable optic fibre wave filter through wavelength division multiplexer and fiber coupler, enter Er-doped fiber once more behind the narrow band light process front end optoisolator by arrowband adjustable optic fibre wave filter, outgoing is the exciting light of fiber laser, at last from rear end optoisolator output laser of narrowband light beam.
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| CN2009200782944U CN201463922U (en) | 2009-07-15 | 2009-07-15 | Multi-fiber grating sensor demodulator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102889903A (en) * | 2011-07-21 | 2013-01-23 | 桂林优西科学仪器有限责任公司 | OFS (optical fiber sensor) measuring system for tunable laser sources and application method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102889903A (en) * | 2011-07-21 | 2013-01-23 | 桂林优西科学仪器有限责任公司 | OFS (optical fiber sensor) measuring system for tunable laser sources and application method thereof |
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