CN202149785U - Optical fiber sensor measuring system for tunable laser light source - Google Patents
Optical fiber sensor measuring system for tunable laser light source Download PDFInfo
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- CN202149785U CN202149785U CN201120259554U CN201120259554U CN202149785U CN 202149785 U CN202149785 U CN 202149785U CN 201120259554 U CN201120259554 U CN 201120259554U CN 201120259554 U CN201120259554 U CN 201120259554U CN 202149785 U CN202149785 U CN 202149785U
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- fiber
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- tunable laser
- grating sensor
- optic grating
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Abstract
The utility model discloses an optical fiber sensor measuring system for a tunable laser light source, wherein a CPU is connected with and controls the tunable laser light source, laser emitted by the light source is divided into M optical beams via an optical splitter, the M optical beams go into the light splitting ports of corresponding 1*2 optical splitters respectively and reach n FBGs in series connection with the combination ports of the 1*2 optical splitters, with n being an integer from 1 to 120, and the central wavelength shift scopes of the n FBGs on the same channel are different and do not intersect or overlap. The other light splitting port of each 1*2 optical splitter is connected with a PD, which is switched into a signal processing circuit, and switched into the CPU via a multiway switch. M optical beams go into M channels respectively, and when an input laser wavelength is the response wavelength of an ith FBG, the laser is reflected, and reflected light is sent to the CPU via the PDs and the signal processing circuits. The CPU identifies which path a received signal belongs to according to the selection state of the multiway switch, and calculates the physical quantity variation of a corresponding test point. The optical fiber sensor measuring system forms an FBG network of multiple monitoring points, and is high in measuring precision and high in speed.
Description
(1) technical field
The utility model relates to the Photoelectric Detection field, is specially a kind of Optical Fiber Sensor Measurement System of tunable laser source.
(2) background technology
Fiber Bragg grating sensor (Fiber Bragg Grating Sensor is a kind of wavelength-modulated type Fibre Optical Sensor FBG), and when laser wavelength of incidence was the response wave length of FBG reflectance spectrum, incident light was reflected, otherwise transmission.The response wave length of fiber Bragg grating sensor changes with external physical quantity (like temperature, tension force), so it can be used for the variation of physical parameters such as detected temperatures, pressure, displacement, stress, voltage, acceleration.From had first in 1989 report with fiber grating as sensor application since, Fibre Optical Sensor receives the extensive attention of each scope of the world, with the conditional electronic sensor relatively; Because the electrical insulating property of Fibre Optical Sensor is good, anti-electromagnetic interference (EMI) and anti-Radio frequency interference (RFI) (RFI) ability are strong, stable chemical performance, corrosion-resistant; Volume is little, in light weight; Loss is little, capacity is big, and highly sensitive, bandwidth is big and be easy to realize advantages such as multichannel or distributed sensing, in a lot of fields such as civil engineering work, Aero-Space, petrochemical complex, compound substance; Fiber Bragg grating sensor has all been obtained successful application, and obtains lasting and development fast.
The light source that Fibre Optical Sensor is selected for use has determined mode of operation, signal processing method, resolution and the sensitivity of measuring system, i.e. measuring accuracy.Thereby select a kind of suitable light source that overall optical fiber sensor Design of Measurement System is played crucial effects.The factor that when selecting light source, need consider is a lot, and like the size of light source, power, stability, coherence, spectral characteristic and with the complexity of optical fiber coupling etc., the price of light source determines to a great extent also whether measuring system can practicability in addition.
At present; General Optical Fiber Sensor Measurement System adopts wideband A SE (amplified spontaneous emission) LASER Light Source; Scheme has two kinds: the wavelength effect detection of reflected light intensity of one, utilizing photodetector; Advantage is that system constitutes simply, and shortcoming is that precision is low, error is big, and can only support 1 road Fibre Optical Sensor to insert; Two, utilize wideband light source to add tunable optic filter and realize that output wavelength is tunable, the advantage of total system is that response speed is fast, and shortcoming is a system complex, need do periodic calibration, and cost is high.The shortcoming of using broad band laser light source maximum is that the optical power density of output is low, and useful power is merely below the per mille of its output general power, thereby causes the Fibre Optical Sensor in this scheme in short range, to use, and measure dot number is few.
At present, Optical Fiber Sensor Measurement System develops towards the direction of wavelength-division multiplex and optical fiber sensor network, and this development trend need adopt tunable laser source.Tunable laser source is meant the laser instrument that can continuously change laser output wavelength within the specific limits, mainly is the place that is used for wavelength (perhaps frequency) is had requirement, and its resolution is high, power is big.But do not see the report of the feasible design of tunable laser source and Fibre Optical Sensor composition measuring system as yet.
(3) utility model content
The purpose of the utility model provides a kind of Optical Fiber Sensor Measurement System of tunable laser source.
The Optical Fiber Sensor Measurement System of the tunable laser source of the utility model design comprises tunable laser source, optical splitter, center processor (CPU) and fiber-optic grating sensor, also has signal processing circuit and multi-way switch.Said fiber-optic grating sensor be fiber Bragg grating sensor (Fiber Bragg Grating Sensor, FBG).Center processor connects the control tunable laser source, and the tunable laser source emitted laser is divided into M road light beam through 1 * M optical splitter, M be in 2～64 2 take advantage of number formulary.The every road of M bundle light connects reverse 1 * 2 optical splitter (i.e. 2 * 1 combiners) that uses; Every road light beam get into its 1 * 2 corresponding optical splitter a branch optical port, arrive n the fiber-optic grating sensor that it closes the road port serial connection; N is 1～120 integer; The response wave length of each fiber-optic grating sensor all has certain bandwidth, and the wavelength points that wherein energy of reflection light is the highest is its centre wavelength.When the frequency spectrum of response wave length for being symmetrically distributed, centre wavelength is exactly the central point of responsive bandwidth.When the fiber-optic grating sensor external physical quantity changes; Its response wave length is at certain scope bias internal; The deviation range of the centre wavelength of the n that connects on a same passage fiber-optic grating sensor is all inequality, and the centre wavelength of promptly adjacent fiber-optic grating sensor does not have juxtaposition.Another minute optical port of each 1 * 2 optical splitter is connected to its corresponding photodetector, and the current signal of this photodetector output inserts corresponding signal processing circuit, in order to catch the reflected light information that this optical splitter closes n fiber-optic grating sensor of terminal series connection.The output of M said signal processing circuit inserts center processor through multi-way switch.The center wavelength shift scope of n fiber-optic grating sensor of different passage series connection can be identical.Center processor control multi-way switch switches in turn with each passage and connects, and selection is to concern one to one to the physical connection of each passage with switch, so which passage the signal that promptly can discern reception through switch selection mode center processor belongs to.
Each fiber-optic grating sensor is according to the difference of external condition, and response wave length is at certain scope bias internal, and the technology when this deviation range is made by grating as required determines.The response wave length deviation range of employed each fiber-optic grating sensor all belongs in the wavelength coverage that tunable laser source covered of native system use in the Optical Fiber Sensor Measurement System of the utility model tunable laser source.And each the self-corresponding center wavelength shift scope of n fiber-optic grating sensor in the same passage is all inequality, and the centre wavelength of promptly adjacent fiber-optic grating sensor does not have juxtaposition.
Reflection spectrum bandwidth λ when n fiber-optic grating sensor
IBWEquate, and the center wavelength shift amount λ of n fiber-optic grating sensor
IdEquate that also so wherein i fiber-optic grating sensor satisfies:
λ
id＜(λ
ALL-λ
iBW)/n
Wherein, λ
ALLScanning wavelength total bandwidth for the used tunable laser source of native system.The center wavelength shift amount λ of each fiber-optic grating sensor
IdBig more, the scope of the physical quantity of test is just big more.
Each fiber-optic grating sensor is 80～90% to the light reflectivity of its centre wavelength.
Integrated analog digit converter or programmable comparator in the said center processor, the output of M said signal processing circuit inserts center processor through multi-way switch, and center processor carries out analog to digital conversion or numeric ratio to the signal that receives.
Perhaps, analog to digital converter or programmable comparator are individual components, and the output terminal of M signal processing circuit inserts center processor through multi-way switch respectively again after corresponding analog to digital converter or programmable comparator.
The center processor control tunable laser source of the Optical Fiber Sensor Measurement System of the tunable laser source of the utility model sends wavelength continually varying laser; Be divided into M road light beam through 1 * M optical splitter; M road light get into respectively M 1 * 2 optical splitter a beam split port transmission to corresponding 1 * 2 optical splitter close n the fiber-optic grating sensor that road port is connected in series; When the scan laser wavelength of input is the reflective spectral response wavelength of wherein i fiber-optic grating sensor; This fiber-optic grating sensor is to laser-bounce, otherwise sees through.Reflected light is through another minute of 1 * 2 optical splitter optical port arrival photodetector, and photodetector converts reflected light into current signal, sends into signal processing circuit, and current signal converts voltage signal into and is admitted to center processor.In the light beam of M road which center processor at first come from according to the current reflected light signal that receives of the current selection mode of multi-way switch identification, calculates the pairing test physics of this reflected light quantitative changeization then.Because the center wavelength shift scope of each fiber-optic grating sensor is all inequality and do not have juxtaposition, be i fiber-optic grating sensor and the current central wavelength lambda of this fiber-optic grating sensor so center processor can calculate this reflected light pairing according to the reflected light signal that is received
I0, and the centre wavelength of demarcating with this fiber-optic grating sensor original state
Relatively, can obtain the variation of the external physical quantity of i fiber-optic grating sensor check point of living in.
For example be used for thermometric fiber-optic grating sensor, its centre wavelength offset characteristic is 0.01nm/ ℃, and the centre wavelength that certain fiber-optic grating sensor is demarcated in the time of 0 ℃ is 1543.890nm.After scanning, obtain in 1544.900～1545.002nm scope reflected light being arranged so, promptly the current centre wavelength of this fiber-optic grating sensor is (1544.900+1545.002)/2=1544.951nm,
Can calculate this fiber-optic grating sensor check point of living in thus
Current Temperatures=0+ (1544.951-1543.890)/0.01=97.1 ℃.
Center processor calculates the current central wavelength lambda of i fiber-optic grating sensor according to the reflected light signal that is received
I0Method be:
Signal processing circuit is sent into the analog to digital conversion numerical value of voltage signal of center processor greater than setting threshold or when reaching the rising edge of programmable comparator, the tunable laser source output wavelength λ that the center processor record is current
I1,, write down current tunable optical source output wavelength λ again when the center processor detects analog to digital conversion numerical value less than setting threshold or when reaching the negative edge of programmable comparator
I2, the current central wavelength lambda of i fiber-optic grating sensor
I0Calculate with following formula:
λ
i0＝(λ
i1+λ
i2)/2
I fiber-optic grating sensor reflected light spectrum width λ
IBWCalculate with following formula:
λ
iBW＝(λ
i2-λ
i1)
The rising edge negative edge of said setting threshold or programmable comparator is 40%～60% of a catoptrical intensity peak.
During the scanning of center processor control tunable laser source, use half numerical value of the reflected light spectrum width of each fiber-optic grating sensor earlier, i.e. λ
IBW/ 2 carry out coarse scanning for stepping, obtain λ
I1And λ
I2Coarse value, near these two wavelength coarse value, carry out close scanning then, thereby obtain the λ that precision reaches 0.05～0.15pm with 0.05～0.15pm stepping
I1And λ
I2Exact value.Such method has also improved 50 times with measuring speed having guaranteed the high-precision while of measuring, and has guaranteed measured real-time property.
The advantage of the Optical Fiber Sensor Measurement System of the utility model tunable laser source is: 1, adopt the multichannel optical splitter; The output of tunable laser source can be told nearly 64 passages; Every passage can be connected and inserted nearly 120 centre wavelength different fibers grating sensors; Constitute the nearly fiber sensor measuring network of 7680 monitoring points, transmission range and measure dot number can satisfy General System and detect requirement; 2, measuring accuracy is high, can detect the variable quantity of the fiber-optic grating sensor centre wavelength that is low to moderate 0.1pm.3, measuring speed is high, has guaranteed measured real-time property; 4, simple in structure, be easy to safeguard that the power utilization of tunable laser source is high, cost of investment is low with maintenance.
(4) description of drawings
Fig. 1 is the structural representation of the Optical Fiber Sensor Measurement System embodiment of this tunable laser source.
(5) embodiment
The Optical Fiber Sensor Measurement System embodiment of this tunable laser source is as shown in Figure 1, comprises tunable laser source, optical splitter, signal processing circuit, analog to digital converter (A/D converter), multi-way switch and center processor (CPU) and fiber-optic grating sensor.Said fiber-optic grating sensor is fiber Bragg grating sensor (FBG).Center processor connects the control tunable laser source; The tunable laser source emitted laser is divided into 64 road light beams through 1 * 64 optical splitter; 64 bundle light get into a branch optical port of 64 1 * 2 optical splitters respectively; Each 1 * 2 optical splitter close n fiber-optic grating sensor of serial connection after the terminal, n is 120 to the maximum.The center wavelength shift scope of n fiber-optic grating sensor is all inequality and do not have a juxtaposition.This example is used the fiber-optic grating sensor that 120 reflected light spectral bandwidths equate, the center wavelength shift amount also equates, the reflected light spectral bandwidth is 0.25～0.45nm.The tuning range of this routine tunable laser source is 1525～1610nm, λ
All=85nm,
(λ
ALL-λ
iBW)/n＝(85-0.45)/120＝704.6pm，
Choose the side-play amount λ of each fiber-optic grating sensor centre wavelength
Id=700pm is less than 704.6pm.
Each fiber-optic grating sensor is 85% to the light reflectivity of its centre wavelength.The center wavelength shift scope situation of n fiber-optic grating sensor of different passages is identical.The reflected light that same 1 * 2 optical splitter closes n fiber-optic grating sensor of terminal series connection is connected to photodetector (PD) along separate routes through another of this optical splitter; The current signal of photodetector (PD) output inserts signal processing circuit; Each connects multi-way switch through analog to digital converter the output of 64 signal processing circuits, thereby is connected to the information processing that center processor carries out each passage.
Said analog to digital converter is an individual components.
The foregoing description is merely concrete example of purpose, technical scheme and beneficial effect further explain to the utility model, and the utility model is not to be defined in this.All any modifications of within the scope of disclosure of the utility model, being made, be equal to replacement, improvement etc., all be included within the protection domain of the utility model.
Claims (4)
1. the Optical Fiber Sensor Measurement System of tunable laser source comprises tunable laser source, optical splitter and center processor and fiber-optic grating sensor; It is characterized in that:
Also comprise signal processing circuit and multi-way switch; Said center processor connects the control tunable laser source; The tunable laser source emitted laser is divided into M road light beam through 1 * M optical splitter; M is the number formulary of taking advantage of of 2 in 2～64; M road light gets into a branch optical port of M 1 * 2 optical splitter respectively, each 1 * 2 optical splitter close n fiber-optic grating sensor of serial connection after the terminal, n is 1～120 integer; The center wavelength shift scope of n fiber-optic grating sensor is all inequality; The reflected light that is connected on n fiber-optic grating sensor behind same 1 * 2 optical splitter is connected to corresponding photodetector through another minute optical port of this optical splitter; The current signal of photodetector output inserts signal processing circuit, and the output of M signal processing circuit inserts center processor through multi-way switch.
2. the Optical Fiber Sensor Measurement System of tunable laser source according to claim 1 is characterized in that:
The reflection spectrum bandwidth λ of a said n fiber-optic grating sensor
IBWEquate, and the center wavelength shift amount λ of n fiber-optic grating sensor
IdEquate that also each parameter satisfies following formula:
λ
id＜(λ
ALL-λ
BW)/n
Wherein, λ
ALLScanning wavelength total bandwidth for said native system tunable laser source.
3. the Optical Fiber Sensor Measurement System of tunable laser source according to claim 1 is characterized in that:
Said M * n fiber-optic grating sensor is 80～90% to the light reflectivity of its centre wavelength.
4. the Optical Fiber Sensor Measurement System of tunable laser source according to claim 1 is characterized in that:
Integrated analog digit converter or programmable comparator in the said center processor;
Perhaps, analog to digital converter or programmable comparator are individual components, and the output terminal of M signal processing circuit inserts center processor through multi-way switch respectively again after corresponding analog to digital converter or programmable comparator.
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| CN201120259554U CN202149785U (en) | 2011-07-21 | 2011-07-21 | Optical fiber sensor measuring system for tunable laser light source |
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| CN201120259554U CN202149785U (en) | 2011-07-21 | 2011-07-21 | Optical fiber sensor measuring system for tunable laser light source |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102692283A (en) * | 2012-06-11 | 2012-09-26 | 太原科技大学 | Device and method for measuring multi-FBG (fiber bragg grating) colorimetric transient temperature |
| 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 |
| CN103308144A (en) * | 2012-03-09 | 2013-09-18 | 桂林市光明科技实业有限公司 | Fiber Bragg grating vibration sensing measurement system and use method |
| CN105116056A (en) * | 2015-09-17 | 2015-12-02 | 山东大学 | Acoustic emission positioning system and method based on FBG sensing system and second order statistic |
| CN115420314A (en) * | 2022-11-03 | 2022-12-02 | 之江实验室 | Electronic endoscope measurement and control system based on Bragg grating position and posture sensing |
-
2011
- 2011-07-21 CN CN201120259554U patent/CN202149785U/en not_active Expired - Fee Related
Cited By (6)
| 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 |
| CN103308144A (en) * | 2012-03-09 | 2013-09-18 | 桂林市光明科技实业有限公司 | Fiber Bragg grating vibration sensing measurement system and use method |
| CN102692283A (en) * | 2012-06-11 | 2012-09-26 | 太原科技大学 | Device and method for measuring multi-FBG (fiber bragg grating) colorimetric transient temperature |
| CN105116056A (en) * | 2015-09-17 | 2015-12-02 | 山东大学 | Acoustic emission positioning system and method based on FBG sensing system and second order statistic |
| CN105116056B (en) * | 2015-09-17 | 2017-12-29 | 山东大学 | Acoustic Emission location system and method based on FBG sensor-based systems and second-order statistic |
| CN115420314A (en) * | 2022-11-03 | 2022-12-02 | 之江实验室 | Electronic endoscope measurement and control system based on Bragg grating position and posture sensing |
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| C53 | Correction of patent of invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Li Yan Inventor after: Zhao Ke Inventor before: Li Yan Inventor before: Wang Guanjun Inventor before: Zhao Ke |
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Free format text: CORRECT: INVENTOR; FROM: LI YAN WANG GUANJUN ZHAO KE TO: LI YAN ZHAO KE |
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Granted publication date: 20120222 Termination date: 20160721 |
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| CF01 | Termination of patent right due to non-payment of annual fee |