CN202547766U - Fiber bragg grating vibration sensing measurement system - Google Patents
Fiber bragg grating vibration sensing measurement system Download PDFInfo
- Publication number
- CN202547766U CN202547766U CN2012200869795U CN201220086979U CN202547766U CN 202547766 U CN202547766 U CN 202547766U CN 2012200869795 U CN2012200869795 U CN 2012200869795U CN 201220086979 U CN201220086979 U CN 201220086979U CN 202547766 U CN202547766 U CN 202547766U
- Authority
- CN
- China
- Prior art keywords
- fiber
- grating sensor
- laser source
- optic grating
- fiber bragg
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Optical Transform (AREA)
Abstract
The utility model discloses a fiber bragg grating vibration sensing measurement system. An upper computer is connected with a tunable laser source, an acquisition card and a signal processing circuit, wherein a synchronous triggering output port of the tunable laser source is connected with a synchronous triggering input port of the acquisition card; laser output by the laser source is connected to a laser splitting port of a coupler; the combination port of the coupler is connected in series with n fiber bragg gratings (FBGs) which are distributed at different test positions and have different working wavelength regions; and the other laser splitting port of the coupler is connected with a photoelectric detector and connected to the acquisition card through the signal processing circuit. During use, in a vibration-free initial state, the n FBGs are subjected to spectral scanning; the acquisition card synchronously acquires, selects and stores set wavelengths lambda(m) of the FBGs; and the acquisition card acquires reflection light power information of the vibrated FBGs to the lambda(m) according to an acquisition frequency set by the upper computer and sends the information to the upper computer for fast fourier transformation (FFT) to obtain a vibration frequency of each point. The fiber bragg grating vibration sensing measurement system can monitor a plurality of points, is high in measurement precision and high in anti-noise property and can dynamically measure and demodulate high-frequency signals at high speed to instantly obtain a result.
Description
(1) technical field
The utility model relates to the Photoelectric Detection field, is specially a kind of fiber bragg grating vibration sensing measurement system.
(2) background technology
Along with the develop rapidly of science and technology, highlight day by day as the sensor status of one of detection technique key areas, towards accurately, sensitive, strong, the small and exquisite and intelligentized direction of adaptability developing.Current optical communication technique develops towards the direction of hypervelocity, high Capacity Communication System rapidly, and progressively to all-optical network evolution.New sensing technology, i.e. Fibre Optical Sensor have appearred under this situation.Fibre Optical Sensor has the incomparable advantage of traditional sensors: capacity is big, highly sensitive, bandwidth is big, in light weight, volume is little, multi-usage, to little, anti-electromagnetic interference (EMI) of medium influence and corrosion-resistant and essential safety, be easy to realize multichannel or distributed sensing or the like.
Fiber-optic grating sensor belongs to a kind of of Fibre Optical Sensor; (Fiber Bragg Grating Sensor is a kind of wavelength-modulated type Fibre Optical Sensor FBG), when laser wavelength of incidence is the response wave length of FBG reflectance spectrum to fiber Bragg grating sensor; Incident light is reflected, otherwise transmission.The response wave length of fiber Bragg grating sensor changes with external physical quantity, so it can be used for detecting the Fibre Optical Sensor and the optical fiber sensor network of different kinds of parameters such as stress, strain, temperature, pressure, displacement, acceleration, inclination angle.
Vibration measurement technique all has a wide range of applications in the civil and military field; The fiber bragg grating vibration sensor that is used for detecting vibration signal is a kind of of Fibre Optical Sensor, and it is applied to, and building construction vibration is measured, the elevator motor vibration frequency is measured and mechanical arm vibration displacement measurement etc.Both at home and abroad the development of optical fiber grating vibration sensor technology is paid much attention at present; Concrete discussion and research have been carried out from many aspects; Be that sensor construction designs or input demodulation aspect has all obtained certain progress, demodulation method commonly used comprises that non-equilibrium M-Z interferes detection, adjustable optic fibre F-P wave filter, the demodulation by filter of matched fiber Bragg grating and the demodulation of tunable laser length scanning.
But multiplexing a plurality of fiber-optic grating sensors simultaneously, optical fiber grating vibration sensor measuring system that test specification is big are not arranged at present as yet, limited the application of Fiber Bragg Grating FBG.
(3) utility model content
The purpose of the utility model provides a kind of fiber bragg grating vibration sensing measurement system, contains the fiber Bragg grating sensor of a plurality of series connection in the system.
The fiber bragg grating vibration sensing measurement system of the utility model design comprises host computer, tunable laser source, coupling mechanism, fiber-optic grating sensor and photodetector.Said fiber-optic grating sensor is fiber Bragg grating sensor (Fiber Bragg Grating Sensor, a FBG sensor), and host computer connects tunable laser source.Have capture card and signal processing circuits synchronous and asynchronous two kinds of mode of operations in addition, host computer connects capture card.Tunable laser source has the synchronous triggering output port, and capture card has the synchronous triggering input port that cooperates with it, and the two is connected.The line data analysis of going forward side by side of PC control tunable laser source output Wavelength of Laser, the mode of operation of control capture card.Signal processing circuit contains signal amplification circuit.The laser beam of tunable laser source output inserts a branch optical port of three-dB coupler; Laser beam arrives three-dB coupler and closes n the fiber-optic grating sensor that road port is connected in series; N is 1～120 integer, and the size of n is by laser tunable range and each fiber-optic grating sensor bandwidth decision.The operation wavelength zone of the n that an is connected fiber-optic grating sensor is all inequality, reflectance spectrum all has certain bandwidth, and the wavelength points that wherein energy of reflection light is the highest is its centre wavelength.N fiber-optic grating sensor is distributed in different test positions; When wherein the external physical quantity of certain fiber-optic grating sensor environment of living in changes; Influence the effective refractive index and the fiber-optic periodic of this fiber-optic grating sensor; Thereby make its reflected light wavelength at certain scope bias internal, and the physical quantity of corresponding its residing test position change.Another of three-dB coupler minute optical port is connected to photodetector; Photodetector converts light signal into electric signal; The current signal of its output amplifies and is transformed into voltage signal through signal processing circuit and inserts capture card, closes each fiber-optic grating sensor reflected light signal of terminal series connection and carries out analog to digital conversion in order to catch this optical splitter.Capture card is accepted synchronous triggering signal and is carried out synchronous acquisition under the synchronous acquisition pattern.Capture card is under Asynchronous Mode, and the average time interval of collection is by the host computer setting, capture card by the frequency acquisition image data of host computer setting, send into host computer.The capture card figure place is many more, and then sensitivity is high more; And picking rate is fast more, and the vibration frequency that then can test is high more.
When the light source output wavelength remains unchanged, when external physical quantity changed the reflected light centre wavelength that causes fiber-optic grating sensor skew takes place, the reflected optical power that then receives changed.Utilize this point, native system is measured the reflectance spectrum of each fiber-optic grating sensor earlier, confirms the setting wavelength of each fiber-optic grating sensor with this.When tunable laser source is exported the setting wavelength of each fiber-optic grating sensor, gather the data of each fiber-optic grating sensor reflected optical power, can detect the vibration frequency of each fiber-optic grating sensor present position by its variation.
The response wave length deviation range of employed each fiber-optic grating sensor all belongs to the wavelength coverage that tunable laser source covered of native system in this fiber bragg grating vibration sensing measurement system.The scanning wavelength total bandwidth of the tunable laser source that native system is used is λ
ALLThe reflection spectrum bandwidth of n fiber-optic grating sensor equates to be λ
BW, the operation wavelength zone is different, and each fiber-optic grating sensor reflectance spectrum marginality is good, and ripple is little, and n will satisfy so:
n＜λ
ALL/λ
BW
Each fiber-optic grating sensor is 80%～90% to the light reflectivity of its centre wavelength.Reflectance spectrum crest both sides slope is by the decision of fiber-optic grating sensor self character, during making, can make slope big as far as possible, and the vibration signal intensity dynamic range of test is little and highly sensitive so; Otherwise sensitivity is low if the little then dynamic range of slope is big.In the measuring process, the setting wavelength of middle the wavelength of linear range of wavelengths of choosing the better more smooth side of reflectance spectrum crest both sides neutral line during, thereby the maximum dynamic range of assurance measuring vibrations signal as working sensor.
Measure the reflectance spectrum of each fiber-optic grating sensor of native system when the fiber bragg grating vibration sensing measurement system of the utility model design uses earlier, confirm the setting wavelength that each fiber-optic grating sensor is corresponding.Make tunable laser source export the setting wavelength of each fiber-optic grating sensor successively afterwards, gather the data of each fiber-optic grating sensor reflected optical power, calculate the vibration frequency of each fiber-optic grating sensor present position by its change-detection.
The advantage of the utility model fiber bragg grating vibration sensing measurement system is: a plurality of fiber-optic grating sensors of 1, connecting, can monitor a plurality of test points; 2, measuring accuracy is high, and anti-noise ability is strong, can detect the corresponding variable quantity of fiber grating sensor wavelength skew that is low to moderate 0.1pm; But 3 high speed kinetic measurements are conciliate and are heightened signal frequently, obtain test result immediately; 4, applying flexible adopts PC control; 5, simple in structure, be easy to safeguard.
(4) description of drawings
Fig. 1 is the structural representation of this fiber bragg grating vibration sensing measurement system embodiment.
(5) embodiment
Embodiment is as shown in Figure 1 for this bragg grating vibrating sensing measuring system, comprises host computer, tunable laser source, coupling mechanism, fiber-optic grating sensor, photodetector, signal processing circuit and capture card.Host computer connects tunable laser source and capture card.Capture card has synchronously and asynchronous two kinds of mode of operations, and tunable laser source has the synchronous triggering output port, and capture card has the synchronous triggering input port that cooperates with it, and the two is connected.The line data analysis of going forward side by side of PC control tunable laser source output Wavelength of Laser, the mode of operation of control capture card.The laser beam of tunable laser source output inserts a branch optical port of three-dB coupler, and laser beam arrives n the fiber-optic grating sensor that this three-dB coupler closes the road port serial connection.The operation wavelength zone of the n that an is connected fiber-optic grating sensor is all inequality, and is distributed in different test positions.Another of three-dB coupler minute optical port is connected to photodetector; Photodetector converts light signal into electric signal; The current signal of its output amplifies and is transformed into voltage signal through signal processing circuit and inserts capture card; Capture card is accepted synchronous triggering signal and is carried out synchronous acquisition under the synchronous acquisition pattern; Under Asynchronous Mode, capture card carries out data acquisition, sends into host computer by the frequency acquisition of host computer setting.
Wavelength coverage 1525～1568nm that this routine tunable laser source covered, total bandwidth is: λ
ALL=1568-1525=43nm, each fiber-optic grating sensor bandwidth that this example is used equates: λ
BW=0.25nm, n＜λ so
ALL/ λ
BW, the n maximal value is 58.This example is got n=15.
Each fiber-optic grating sensor is 80%～90% to the light reflectivity of its centre wavelength.
When this bragg grating vibrating sensing measuring system embodiment uses, earlier 15 fiber-optic grating sensors are carried out spectral scan not receiving under the vibration effect original state, confirm the setting wavelength that each fiber-optic grating sensor is corresponding, be recorded as λ
mAnd be stored in the host computer, m=1,2,3 ... 15, m is the sequence number of each fiber-optic grating sensor.Starter motor is according to the setting wavelength X of 15 fiber-optic grating sensors
mSet the output optical maser wavelength of tunable laser source successively, measure the reflected optical power change information that each fiber-optic grating sensor is influenced by motor oscillating, and obtain the vibration frequency of each test point with the FFT demodulation.
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 (3)
1. the fiber bragg grating vibration sensing measurement system comprises host computer, tunable laser source, coupling mechanism, fiber-optic grating sensor and photodetector; Said fiber-optic grating sensor is a fiber Bragg grating sensor, and host computer connects tunable laser source; It is characterized in that:
Have capture card and signal processing circuits synchronous and asynchronous two kinds of mode of operations in addition, host computer connects capture card; Tunable laser source has the synchronous triggering output port, and capture card has the synchronous triggering input port that cooperates with it, and the two is connected; The line data analysis of going forward side by side of PC control tunable laser source output Wavelength of Laser, the mode of operation of control capture card; Signal processing circuit contains signal amplification circuit; The laser beam of tunable laser source output inserts a branch optical port of three-dB coupler; Laser beam arrives three-dB coupler and closes n the fiber-optic grating sensor that road port is connected in series; N is 1～120 integer; The operation wavelength zone of the n that an is connected fiber-optic grating sensor is all inequality, the highest wavelength points of energy of reflection light is its centre wavelength in the reflectance spectrum, and n fiber-optic grating sensor is distributed in different test positions; Another of three-dB coupler minute optical port is connected to photodetector; The current signal of photodetector output inserts capture card through signal processing circuit; Capture card is accepted synchronous triggering signal and is carried out synchronous acquisition under the synchronous acquisition pattern; Capture card carries out data acquisition, sends into host computer by the frequency acquisition of host computer setting under Asynchronous Mode.
2. fiber bragg grating vibration sensing measurement system according to claim 1 is characterized in that:
The size of said n is by laser tunable range and each fiber-optic grating sensor bandwidth decision, and the scanning wavelength total bandwidth of described tunable laser source is λ
ALL, the reflection spectrum bandwidth of n fiber-optic grating sensor equates to be λ
BW, n is satisfied with:
n＜λ
ALL/λ
BW。
3. fiber bragg grating vibration sensing measurement system according to claim 1 is characterized in that:
Said each fiber-optic grating sensor is 80～90% to the light reflectivity of its centre wavelength.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200869795U CN202547766U (en) | 2012-03-09 | 2012-03-09 | Fiber bragg grating vibration sensing measurement system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200869795U CN202547766U (en) | 2012-03-09 | 2012-03-09 | Fiber bragg grating vibration sensing measurement system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202547766U true CN202547766U (en) | 2012-11-21 |
Family
ID=47168384
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200869795U Expired - Fee Related CN202547766U (en) | 2012-03-09 | 2012-03-09 | Fiber bragg grating vibration sensing measurement system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202547766U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103033205A (en) * | 2012-12-14 | 2013-04-10 | 张丽 | Fiber bragg grating interrogator based on digitization tunable light sources and method thereof |
| CN103090991A (en) * | 2013-01-11 | 2013-05-08 | 上虞市电力公司 | Fiber grating demodulator used for taking temperature of electrical equipment |
| 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 |
| CN103337120A (en) * | 2013-06-26 | 2013-10-02 | 武汉理工光科股份有限公司 | Addressing method and system for quasi-distributed fiber bragg grating perimeter intrusion alarming system |
| CN105157812A (en) * | 2015-09-18 | 2015-12-16 | 南京派光信息技术有限公司 | Digital enhanced interference-based high-sensitivity quasi-distributed fiber bragg grating vibration sensor |
| CN107553477A (en) * | 2017-10-12 | 2018-01-09 | 桐乡市易知简能信息技术有限公司 | A kind of multi-joint stabilizing mechanical hand |
| CN111885434A (en) * | 2020-06-18 | 2020-11-03 | 华为技术有限公司 | Port identification method, device and system |
| CN114609494A (en) * | 2022-05-12 | 2022-06-10 | 华北电力大学 | GIL partial discharge optical fiber sensing system |
-
2012
- 2012-03-09 CN CN2012200869795U patent/CN202547766U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN103033205A (en) * | 2012-12-14 | 2013-04-10 | 张丽 | Fiber bragg grating interrogator based on digitization tunable light sources and method thereof |
| CN103033205B (en) * | 2012-12-14 | 2016-04-20 | 张丽 | A kind of fiber Bragg grating (FBG) demodulator based on digitizing tunable optical source and demodulation method thereof |
| CN103090991A (en) * | 2013-01-11 | 2013-05-08 | 上虞市电力公司 | Fiber grating demodulator used for taking temperature of electrical equipment |
| CN103337120A (en) * | 2013-06-26 | 2013-10-02 | 武汉理工光科股份有限公司 | Addressing method and system for quasi-distributed fiber bragg grating perimeter intrusion alarming system |
| CN105157812A (en) * | 2015-09-18 | 2015-12-16 | 南京派光信息技术有限公司 | Digital enhanced interference-based high-sensitivity quasi-distributed fiber bragg grating vibration sensor |
| CN107553477A (en) * | 2017-10-12 | 2018-01-09 | 桐乡市易知简能信息技术有限公司 | A kind of multi-joint stabilizing mechanical hand |
| CN111885434A (en) * | 2020-06-18 | 2020-11-03 | 华为技术有限公司 | Port identification method, device and system |
| CN114609494A (en) * | 2022-05-12 | 2022-06-10 | 华北电力大学 | GIL partial discharge optical fiber sensing system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202547766U (en) | Fiber bragg grating vibration sensing measurement system | |
| CN103308144A (en) | Fiber Bragg grating vibration sensing measurement system and use method | |
| CN105865753B (en) | A kind of measuring device and measuring method of fibre optic interferometer arm length difference | |
| CN102426198B (en) | Acoustic emission signal sensing system based on matching-type fiber Bragg grating (FBG) | |
| CN201845405U (en) | Optical fiber grating temperature fire alarm system employing combination of etalon and temperature control grating | |
| CN103017804B (en) | High time synchronized multi-path optical fiber grating sensing system | |
| JP3944578B2 (en) | Strain and AE measuring device using optical fiber sensor | |
| CN201476800U (en) | High-speed multi-channel fiber grating sensor demodulating system based on AWG | |
| CN104848980B (en) | Bridge cable Suo Li online test methods and system based on Fibre Optical Sensor | |
| CN101650509B (en) | Bragg grating high-speed demodulating system based on cascade-connection long period fiber grating | |
| CN1955640A (en) | Fibre-optical grating sensor and its wavelength demodulation method and sensor | |
| CN102589588A (en) | Method for demodulating cavity length of Fabry-Perot cavity by utilizing fiber Bragg gratings | |
| Orr et al. | High-speed, solid state, interferometric interrogator and multiplexer for fiber Bragg grating sensors | |
| CN102661755A (en) | Fiber Bragg grating-based extensible distributed sensing system | |
| CN105181108A (en) | Optical fiber grating earth sound sensing probe and sensing system | |
| CN102506917A (en) | Optical fiber sensing device for optical fiber chaos laser device and method thereof | |
| CN102269573A (en) | Quasi-distributed composite structure strain and temperature detection system | |
| CN102778242A (en) | Demodulation method for Bragg grating | |
| CN114111909A (en) | Fiber Bragg grating temperature and stress dual-parameter integrated sensing and demodulating system based on diffraction grating | |
| CN104848927A (en) | Vibration detection system based on chirped grating sensing and wavelength division multiplexing technology | |
| CN107356275A (en) | A kind of method that spectral resolution is improved in optical frequency domain reflection-based optical fiber distributed sensing | |
| CN111811554A (en) | Optical cavity ring-down-based large-range high-precision fiber grating sensing method and device | |
| CN111189556A (en) | Real-time multichannel fiber grating temperature measurement system based on AWG | |
| Fujisue et al. | Demodulation of acoustic signals in fiber Bragg grating ultrasonic sensors using arrayed waveguide gratings | |
| CN207036297U (en) | A kind of optical fiber grating temperature-measuring system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121121 Termination date: 20160309 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |