CN202903210U - Fiber grating sensing device - Google Patents
Fiber grating sensing device Download PDFInfo
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- CN202903210U CN202903210U CN 201220516163 CN201220516163U CN202903210U CN 202903210 U CN202903210 U CN 202903210U CN 201220516163 CN201220516163 CN 201220516163 CN 201220516163 U CN201220516163 U CN 201220516163U CN 202903210 U CN202903210 U CN 202903210U
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- grating sensing
- bragg grating
- fiber bragg
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Abstract
The utility model provides a fiber grating sensing device with a large capacity, comprising a pulse signal generator, a wavelength measuring module, a coupler, several fibers, a time-delay fiber, and a sensing array. The fiber grating sensing device further comprises a reflective semiconductor optical amplifier RSOA, the sensing array is formed by serial connection of a plurality of low reflectivity sensors with the same center wavelength, and spacing between every two sensors is 2-5 meters. The fiber grating sensing device is advantageous in that, a mixed multiplexing technology of division multiplexing and wavelength division multiplexing in combination is provided, the sensors are grouped, and sensor groups are accessed in the mode of match of parallel connection and serial connection, thereby greatly increasing multiplexing capacity of the sensors of a system.
Description
Technical field
The utility model relates to cheaply fiber grating sensing system of a kind of large capacity.
Background technology
Fiber-optic grating sensor is the light sensitive characteristic that utilizes optical fiber core material, forms the structure that refractive index becomes period profile by UV-irradiation at fibre core, is satisfying under the condition of phase matching, produces wavelength selectivity thereby coupling occurs between the resonant wavelength pattern.The resonant wavelength of fiber grating is subjected to the impact of the external environment conditions such as temperature and strain, so it can be used as sensor and change by wavelength variations perception external environment condition parameter, realizes the measurement of various parameters.Except have that the ordinary optic fibre sensor has lightweight, be not subjected to electromagnetic interference (EMI), the advantage such as highly sensitive, anticorrosive the characteristics such as easy networking is measured, large capacity-sharing, Wavelength demodulation that it also has.
The optical fiber optical grating multiplexing technology is the basis that makes up optical fiber sensing network, and common optical fiber optical grating multiplexing technology has wavelength-division multiplex (WDM), time division multiplex (TDM), space division multiplexing (SDM) and their hybrid multiplex technology.These multiplex techniques exist the cost that consists of sensor-based system relatively high at present, and power system capacity is limited, the problems such as inconvenient operation.Optical fiber sensing technology Future Development direction is low cost, high-performance, large capacity and networking, therefore increases the system multiplexing capacity sensor and reduce the optical fiber sensing system cost to be significant.
Wavelength-division multiplex: each sensor takies certain spectral range, the operation wavelength non-overlapping copies, and the identification of sensor is to judge according to wavelength coverage.The multiplexing number of sensors of wavelength-division multiplex technique is determined by dynamic range and the light source bandwidth of measurement point, common wideband light source bandwidth is 40 ~ 60nm, the quantity of limited light source limit bandwidth sensor can realize the multiplexing of 15 ~ 20 sensors on the common single optical fiber.Advantage: the sensor signal to noise ratio (S/N ratio) is high; Shortcoming: multiplexing negligible amounts, dynamic range of sensor is little, and cost is higher.
Time division multiplex: this technology adopts light-pulse generator, and each working sensor is in identical wavelength coverage, and the identification of sensor is to rely on the time interval that is reflected back signal.Only need a mask plate to make the antiradar reflectivity grating of same period, the sensor reflected signal is faint.Number of sensors is not subjected to the light source limit bandwidth, and each sensor all can use whole light source bandwidth.Because each sensor wavelength is identical, therefore can reflect the signal section of all the other sensors and generation signal attenuation, sensor is more, and attenuated optical signal is also faster.Advantage: cost is lower, and multiplexing capacity is large, and dynamic range of sensor is large; Shortcoming: the sensor signal to noise ratio (S/N ratio) is low.
Space division multiplexing: need the photoswitch switching channel, realize the selection of different sensors array, because there is insertion loss in photoswitch, the more insertion loss of space division multiplexing cascade level are larger, and are longer during interchannel addressing, and system configuration is complicated.Advantage: signal to noise ratio (S/N ratio) is higher; Shortcoming: system complex, cost is higher.
Fiber grating sensing system is mainly take wavelength-division multiplex technique as main at present, the most representative is the fiber grating sensing system of Micron Optics company, this system adopts wavelength-division multiplex technique and tunable laser source to realize multichannel simultaneously scanning, owing to adopt wavelength-division multiplex technique, the quantity of each channel sensor and dynamic range are subjected to the light source limit bandwidth, in high-capacity optical fiber Application in Sensing occasion, need several system to work simultaneously or adopt photoswitch to realize the passage expansion, the method for this increase capacity causes sensor-based system too complicated and expensive.Therefore, in conjunction with the advantage of various multiplex techniques, structure possesses that system architecture is simple, dependable performance, multiplexing optical fiber sensing system capacious are to reduce system cost, promotes the key that optical fiber sensing technology is used in each field.
The utility model content
The purpose of this utility model provides the multiplexer of a kind of low cost and jumbo fiber-optic grating sensor, and it is higher to solve current fiber grating sensing system cost, the problem that capacity is less.
A kind of fiber bragg grating sensing device of one of the utility model embodiment comprises a pulse signal generator, a wavelength measurement module, a coupling mechanism, some optical fiber, a time delay optical fiber and a sensor array, and this fiber bragg grating sensing device further comprises a reflection type semiconductor image intensifer RSOA, described sensor array is in series by the identical antiradar reflectivity sensor of a plurality of centre wavelengths, spacing 2-5 rice between each sensor.
A kind of fiber bragg grating sensing device of two of the utility model embodiment, comprise a pulse signal generator, one wavelength measurement module, one coupling mechanism, some time delay optical fiber and a sensor array, and this fiber bragg grating sensing device further comprises a reflection type semiconductor image intensifer RSOA and an array waveguide optical grating AWG, this array waveguide grating AWG is connected between time delay optical fiber and the sensor array, this sensor array is connected in parallel on described array waveguide grating AWG by m group sensor group and forms, and every group of sensor internal is in series by n the identical antiradar reflectivity sensor of centre wavelength.
A kind of fiber bragg grating sensing device of three of the utility model embodiment, comprise a pulse signal generator, a wavelength measurement module, a coupling mechanism, some optical fiber, some time delay optical fiber and a sensor array, and this fiber bragg grating sensing device further comprises a reflection type semiconductor image intensifer RSOA, described sensor array is in series by m group sensor group, connect with time delay optical fiber between every group of sensor group, and every group of sensor internal is in series by n the different antiradar reflectivity sensor of centre wavelength.
A kind of fiber bragg grating sensing device of the utility model drives reflection type semiconductor image intensifer RSOA and different sensors formation resonant cavity by the pulse signal of different frequency, realizes reading of different transducing signals.It adopts the mode of timesharing access sensors, solved the problem that traditional fiber grating wavelength-division multiplex technique number of sensors is subjected to the light source limit bandwidth, owing to adopt the resonant cavity technology, faint transducing signal can amplify in the chamber, has therefore also solved the low problem of traditional time-division multiplex technology transducing signal signal to noise ratio (S/N ratio).In conjunction with the hybrid multiplex technology of time division multiplex and wavelength-division multiplex, sensor is divided into groups, with mode access sensors group in parallel, that series connection is arranged in pairs or groups mutually, greatly increased the multiplexing capacity of system for sensor.
Description of drawings
Fig. 1 is the structural representation of the first embodiment of a kind of fiber bragg grating sensing device of the utility model.
Fig. 2 is the basic functional principle figure of the first embodiment of a kind of fiber bragg grating sensing device of the utility model.
Fig. 3 is the structural representation of the second embodiment of a kind of fiber bragg grating sensing device of the utility model.
Fig. 4 is the structural representation of the 3rd embodiment of a kind of fiber bragg grating sensing device of the utility model.
Fig. 5 is the structural representation of the 4th embodiment of a kind of fiber bragg grating sensing device of the utility model.
Embodiment
By describing technology contents of the present utility model, structural attitude in detail, reached purpose and effect, below hereby exemplify embodiment and cooperate that accompanying drawing is detailed to give explanation.
Embodiment one
A kind of fiber bragg grating sensing device of the utility model comprises a reflection type semiconductor image intensifer RSOA1, a pulse signal generator 2, a wavelength measurement module 3, a coupling mechanism 4, some optical fiber, time delay optical fiber 6 and a sensor array 7.
See also Fig. 1 and Fig. 2, the embodiment step of a kind of fiber bragg grating sensing device of the utility model is as follows:
One, utilize Programmable pulse generator 2 to produce a pulsewidth and adjustable pulse signal driving reflection type semiconductor image intensifer RSOA1 of cycle, reflection type semiconductor image intensifer RSOA1 sends frequency, the pulsewidth broadband optimal pulse corresponding with pulse signal under pulse signal drives, light pulse signal enters sensor array 7 through after the time delay optical fiber 6, and the reflectivity of described sensor is 1%-5%;
Two, described sensor array 7 is in series by the identical antiradar reflectivity sensor of a plurality of centre wavelengths, and spacing is 2-5 rice between each sensor, and is connected with optical fiber between sensor and the sensor;
Three, described broadband optimal pulse is propagated in optical fiber, part signal is reflected when running into sensor, the signal that is reflected by each sensor arrives reflection type semiconductor image intensifer RSOA1 successively, the cycle that pulse signal is set and light signal are when equate to two-way time between a sensor and the reflection type semiconductor image intensifer RSOA1 therein, this sensor signal can enter reflection type semiconductor image intensifer ROSA1 and be exaggerated, and the signal of other sensor then can't enter reflection type semiconductor image intensifer RSOA1;
Four, after the transducing signal that enters reflection type semiconductor image intensifer RSOA1 is exaggerated, enter wavelength measurement module 3 through coupling mechanism 4 part signals, realize the measurement of selected sensor senses signal.
The control input end of reflection type semiconductor image intensifer RSOA1 is connected with the output terminal of pulse signal generator 2; The optical fiber I/O end of reflection type semiconductor image intensifer RSOA1 links to each other with the input end of coupling mechanism 4.Described coupling mechanism 4 is the coupling mechanism of 10:90 splitting ratio for output terminal, and the port of described coupling mechanism 4 splitting ratios 10% is connected with wavelength measurement module 3, and the port of splitting ratio 90% is connected with an end of time delay optical fiber 6.An other end of described time delay optical fiber 6 is connected with first sensor of sensor array 7.
Described wavelength measurement module adopts the spectral measurement module based on the CCD technology, perhaps based on the wavelength measurement meter of edge filter technology.Pulsewidth and the cycle adjustable module of described pulse signal generator 2 for adopting the FPGA programming device to realize.
See also Fig. 2, basic functional principle of the present utility model is as follows: pulse signal generator 2 produces the pulse signal that frequency is adjustable, when first pulse is applied to reflection type semiconductor image intensifer RSOA1, reflection type semiconductor image intensifer RSOA1 since self-excitation radiation (ASE) send a broadband optimal pulse and propagate along the sensor array column direction, when broadband optimal pulse runs into each sensor, the part luminous power is reflected, the wavelength of the light pulse signal of each sensor reflection is to wavelength that should sensor, the transducing signal that is reflected arrives reflection type semiconductor image intensifer RSOA1 successively, wherein, light signal arrives sensor S
1, S
2, S
3... S
NTime be respectively T
1, T
2, T
3... T
nWhen cycle of pulse signal generator 2 and light pulse signal at reflection type semiconductor image intensifer RSOA1 and sensor S
1Between when come and go equating, i.e. pulse producer cycle T=2T
1The time, then by sensor S
1When the light signal of reflection arrived reflection type semiconductor image intensifer RSOA1, reflection type semiconductor image intensifer RSOA1 was in conducting state, and transducing signal λ
1Can enter reflection type semiconductor image intensifer RSOA1 is exaggerated and reflects again and propagate to the sensor array column direction.The light pulse signal that this moment, reflection type semiconductor image intensifer RSOA1 sent is by self-excitation radiation (ASE) broadband optimal pulse that produces and the sensor signal λ that is exaggerated
1Be formed by stacking.Repeat above process, can amplify the reflection type semiconductor image intensifer RSOA1 of 18dB as light source and photoswitch gating device, transducing signal λ to input optical signal because the utility model fiber bragg grating sensing device adopts
1Repeatedly enter reflection type semiconductor image intensifer RSOA1 by the saturated output of gradual magnification to reflection type semiconductor image intensifer RSOA1, enter the optic fiber grating wavelength demodulation module through coupling mechanism 4 part transducing signals, realize the measurement of sensor wavelength.Sensor S
1And S
2Between connect with optical fiber, the travel-time of light pulse between the two is T
S1, reflected signal λ
1, λ
2Mistiming be 2T
S1For with sensor signal λ
1, λ
2Separately, then the width of pulse signal satisfies: T
W＜2T
S1When the signal of other sensor reflection arrives reflection type semiconductor image intensifer RSOA1, because pulse signal cycle and sensor are unequal two-way time, this moment, reflection type semiconductor image intensifer RSOA1 was in closed condition, the light pulse signal that sensing is sent is absorbed, so realized the access of sensor S1, and then can draw light pulse signal at sensor S
11, S
12, S
13... S
1nAnd be respectively 2T two-way time between the reflection type semiconductor image intensifer RSOA1
11, 2T
11+ 2T
S1,
The cycle of pulse signal generator 2 adjusted to each sensor equate two-way time, then can realize the access of each sensor.If equidistantly, light pulse travel-time between adjacent sensors is T between the sensor
S1, then the pulse signal cycle of addressing individual sensor is respectively: 2T
11, 2T
11+ 2T
S1..., 2T
11+ 2 (n-1) T
S1, then can realize access to all the sensors in the sensor array by the frequency that changes pulse signal generator.
Embodiment two
See also Fig. 3, present embodiment and embodiment one difference mainly are: (one) present embodiment further comprises an array waveguide optical grating AWG8, and this array waveguide grating AWG8 is connected between time delay optical fiber 6 and the sensor array 7; (2) sensor array is different, and this sensor array 7 is formed in parallel by m group sensing group.Every group of sensor internal consists of by n the identical antiradar reflectivity sensor of centre wavelength, and the centre wavelength between the sensor group is different, and the wavelength of each sensor group is in the output wavelength scope of each corresponding ports of array waveguide grating AWG8.
The corresponding ports phase downlink connection of every group of sensor and array waveguide grating AWG8 light splitting end, and the fiber lengths that is connected between the corresponding ports of every group of sensor and array waveguide grating AWG8 light splitting end equates that all the transducer spacing of each sensor group inside also equates.
The broadband optimal pulse that reflection type semiconductor image intensifer RSOA1 sends is divided into m the narrow band light pulse that wavelength is different when passing through array waveguide grating AWG8, the light splitting end of process array waveguide grating AWG8 enters respectively respectively organizes sensor array.M the different narrow band light pulse of wavelength propagated in each group sensor array, propagates to reflection type semiconductor image intensifer RSOA1 direction by array waveguide grating AWG8 after being reflected successively by each sensor.The transducing signal that arrives simultaneously reflection type semiconductor image intensifer RSOA1 is made of m the different transducing signal of wavelength, transducing signal reflection type semiconductor optical amplifier RSOA1 amplification enters wavelength measurement module 3 by overcoupling device 4, and the signal of m sensor is measured.Wavelength measurement module 3 in this embodiment is the spectral measurement module based on the CCD technology.
Embodiment three
See also Fig. 4, present embodiment mainly is from embodiment one difference: sensor array is different.In the present embodiment, described sensor array 7 is in series by m group sensor group, connect with time delay optical fiber 6 between every group of sensor group, and every group of sensor internal is made of n the different antiradar reflectivity sensor of centre wavelength.Sensor group 1, sensor group 2 ... time-multiplexed mode is adopted in the access of sensor group m.
The broadband optimal pulse that described reflection type semiconductor image intensifer RSOA1 sends is reflected after arriving and respectively organizing sensor successively, be with embodiment one difference: the pulsewidth of pulse signal generator is wider, the light impulse length that reflection type semiconductor image intensifer RSOA1 sends can shine all the sensors in each group sensor simultaneously, is made of m the different transducing signal of wavelength so arrive the transducing signal of reflection type semiconductor image intensifer RSOA1.Transducing signal reflection type semiconductor optical amplifier RSOA1 amplification enters wavelength measurement module 3 by overcoupling device 4, and the signal of m sensor is measured.Wavelength measurement module 3 in this embodiment is the spectral measurement module based on the CCD technology, measures when can realize a plurality of wavelength.
Embodiment four
See also Fig. 5, present embodiment and embodiment one difference mainly are: present embodiment further comprises a 1*M coupling mechanism 9, between these described 1*M coupling mechanism 9 butt coupling devices and the sensor array 7; Described sensor array 7 is connected in parallel on described 1*M coupling mechanism 9 by a plurality of sensor groups and forms, and every group of sensor internal consists of series connection by the identical a plurality of antiradar reflectivity sensors of centre wavelength.Centre wavelength between described each sensor group can be identical, also can be different.Described each sensor group all interconnects by a time delay optical fiber and described 1*M coupling mechanism 9, and the length of described each time delay optical fiber is all unequal.In the sensor permutation 7, the length of described time delay optical fiber must satisfy following condition: the length of rear one group of time delay optical fiber is greater than length and the last sensor group length sum of last group of time delay optical fiber, and also, the length of time delay optical fiber will satisfy following condition: L
iL
I-1+ L '
I-1L ' wherein
I-1Be that the input end of first sensor of i-1 group sensor is to the length of the optical fiber of last transducer tip.So time delay optical fiber L is arranged
1, L
2... L
mThe time delay that produces causes that respectively to organize sensor accessed in different time ranges.The wavelength measurement module of this embodiment adopts the spectral measurement module based on the CCD technology, perhaps based on the wavelength measurement meter of edge filter technology.
In sum, a kind of fiber bragg grating sensing device 100 of the utility model drives reflection type semiconductor image intensifer RSOA1 and different sensors formation resonant cavity by the pulse signal of different frequency, realizes reading of different transducing signals.It adopts the mode of timesharing access sensors, solved the problem that traditional fiber grating wavelength-division multiplex technique number of sensors is subjected to the light source limit bandwidth, owing to adopt the resonant cavity technology, faint transducing signal can amplify in the chamber, has therefore also solved the low problem of traditional time-division multiplex technology transducing signal signal to noise ratio (S/N ratio).In conjunction with the hybrid multiplex technology of time division multiplex and wavelength-division multiplex, sensor is divided into groups, with mode access sensors group in parallel, that series connection is arranged in pairs or groups mutually, greatly increased the multiplexing capacity of system for sensor.
Above-described technical scheme only is the preferred embodiment of a kind of fiber bragg grating sensing device 100 of the utility model, within any equivalent transformation or the scope of the replacement claim that is included in this patent doing on a kind of fiber bragg grating sensing device of the utility model 100 bases.
Claims (10)
1. fiber bragg grating sensing device, comprise a pulse signal generator, a wavelength measurement module, a coupling mechanism, some optical fiber, a time delay optical fiber and a sensor array, it is characterized in that: this fiber bragg grating sensing device further comprises a reflection type semiconductor image intensifer RSOA, described sensor array is in series by the identical antiradar reflectivity sensor of a plurality of centre wavelengths, spacing 2-5 rice between each sensor.
2. fiber bragg grating sensing device, comprise a pulse signal generator, a wavelength measurement module, a coupling mechanism, some time delay optical fiber and a sensor array, it is characterized in that: this fiber bragg grating sensing device further comprises a reflection type semiconductor image intensifer RSOA and an array waveguide optical grating AWG, this array waveguide grating AWG is connected between time delay optical fiber and the sensor array, this sensor array is connected in parallel on described array waveguide grating AWG by m group sensor group and forms, and every group of sensor internal is in series by n the identical antiradar reflectivity sensor of centre wavelength.
3. fiber bragg grating sensing device according to claim 2 is characterized in that: the centre wavelength difference between described each sensor group.
4. fiber bragg grating sensing device, comprise a pulse signal generator, a wavelength measurement module, a coupling mechanism, some optical fiber, some time delay optical fiber and a sensor array, it is characterized in that: this fiber bragg grating sensing device further comprises a reflection type semiconductor image intensifer RSOA, described sensor array is in series by m group sensor group, connect with time delay optical fiber between every group of sensor group, and every group of sensor internal is in series by n the different antiradar reflectivity sensor of centre wavelength.
5. according to claim 1, the described fiber bragg grating sensing device of any one in 2,4, it is characterized in that: described coupling mechanism is that output terminal is the coupling mechanism of 10:90 splitting ratio.
6. according to claim 1, the described fiber bragg grating sensing device of any one in 2,4, it is characterized in that: minute optical port of described coupling mechanism 10% links to each other with the wavelength measurement module, and the port of splitting ratio 90% is connected with an end of time delay optical fiber ring.
7. according to claim 1, the described a kind of fiber bragg grating sensing device of any one in 2,4, it is characterized in that: employing can be amplified to the input optical pulse signal reflection type semiconductor image intensifer RSOA of 18dB.
8. according to claim 1, the described a kind of fiber bragg grating sensing device of 2,4 any one, it is characterized in that: the wavelength measurement module adopts the spectral measurement module based on the CCD technology, perhaps based on the wavelength measurement meter of edge filter technology.
9. according to claim 1, the described a kind of fiber bragg grating sensing device of 2,4 any one, it is characterized in that: pulsewidth and the cycle adjustable module of pulse signal generator for adopting the FPGA programming device to realize, the pulse minimum widith can reach for 10 nanoseconds.
10. according to claim 1, the described fiber bragg grating sensing device of any one in 2,4, it is characterized in that: the reflectivity of described sensor is 1%-5%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220516163 CN202903210U (en) | 2012-10-09 | 2012-10-09 | Fiber grating sensing device |
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|---|---|---|---|
| CN 201220516163 CN202903210U (en) | 2012-10-09 | 2012-10-09 | Fiber grating sensing device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102853858A (en) * | 2012-10-09 | 2013-01-02 | 成都阜特科技股份有限公司 | Fibre grating sensing device |
| CN106525091A (en) * | 2016-10-25 | 2017-03-22 | 华中科技大学 | Fiber grating array sensing demodulation system based on multi-wavelength pulse differential modulation |
| CN107402028A (en) * | 2017-08-02 | 2017-11-28 | 南昌大学 | A kind of multi-path optical fiber grating sensing system based on intensity type wavelength-division multiplex technique |
| CN109387756A (en) * | 2018-12-13 | 2019-02-26 | 云南电网有限责任公司电力科学研究院 | A kind of partial discharge detecting system and method based on fiber grating |
-
2012
- 2012-10-09 CN CN 201220516163 patent/CN202903210U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102853858A (en) * | 2012-10-09 | 2013-01-02 | 成都阜特科技股份有限公司 | Fibre grating sensing device |
| CN106525091A (en) * | 2016-10-25 | 2017-03-22 | 华中科技大学 | Fiber grating array sensing demodulation system based on multi-wavelength pulse differential modulation |
| CN107402028A (en) * | 2017-08-02 | 2017-11-28 | 南昌大学 | A kind of multi-path optical fiber grating sensing system based on intensity type wavelength-division multiplex technique |
| CN109387756A (en) * | 2018-12-13 | 2019-02-26 | 云南电网有限责任公司电力科学研究院 | A kind of partial discharge detecting system and method based on fiber grating |
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