CN203519025U - High-speed fiber grating demodulation system - Google Patents
High-speed fiber grating demodulation system Download PDFInfo
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- CN203519025U CN203519025U CN201320481178.3U CN201320481178U CN203519025U CN 203519025 U CN203519025 U CN 203519025U CN 201320481178 U CN201320481178 U CN 201320481178U CN 203519025 U CN203519025 U CN 203519025U
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Abstract
The utility model discloses a high-speed fiber grating demodulation system, belonging to the technical field of fiber grating sensing and wavelength demodulation. The high-speed fiber grating demodulation system is mainly composed of an FPGA (Field Programmable Gate Array) demodulation circuit board, a reflection type diffraction grating spectrum demodulation module, an ASE (Amplified Spontaneous Emission) light source, a high-speed optical switch, an optical coupler, a switching power supply and a host computer, wherein the FPGA demodulation circuit board comprises an FPGA processor, a high-speed analog signal collecting circuit, a filter circuit, a network communication interface circuit, an SDRAM (Synchronous Dynamic Random Access Memory) storage circuit, an optical switch control circuit, and a power conversion and voltage stabilization circuit; the high-speed optical switch is connected with the ASE light source and the reflection type diffraction grating spectrum demodulation module via the optical coupler; the FPGA demodulation circuit board is connected with the reflection type diffraction grating spectrum demodulation module via a control interface; and original spectrum signals are collected and transmitted to the host computer via network cables, and software of the host computer demodulates the wavelength of the signals and displays relative data. The high-speed fiber grating demodulation system can improve the stability of circuits, effectively improve the demodulation speed, and overcome interference of light noises in wavelength modulation.
Description
Technical field
The utility model relates to a kind of optical fiber grating regulating system, belongs to optical fiber grating sensing and Wavelength demodulation technical field.
Background technology
Development along with optical fiber sensing technology, fiber-optic grating sensor is with its anti-electromagnetic interference (EMI), corrosion-resistant, high-insulativity, is convenient to the advantages such as distributed measurement, in civil engineering work, petrochemical complex, Aero-Space, medical treatment, widespread use has been obtained in the fields such as shipping industry, becomes and in sensory field, develops one of technology faster.FBG (Fiber Bragg Grating, Fiber Bragg Grating FBG) can be packaged into various sensors, for temperature, and the detection of the physical quantitys such as strain and pressure.Yet along with the continuous progress of technology, and the needs of safety monitoring, proposed to utilize FBG to detect the requirement of vibration information, this just requires the optical fiber grating regulating system can two-forty, wide region, the variable quantity of high-resolution measurement FBG reflection wavelength.
According to the difference of fiber grating sensing signal, the light of reflection meeting specific wavelength, is converted to pulse signal through photoelectric conversion section, the corresponding reflected light wavelength of peak value of pulse.Mostly there is the deficiency that demodulation rate is lower in present fiber grating signal demodulating system, and due to the interference of various optical noises, when light intensity changes greatly, can bring very large impact to peak value sampling.
Fiber grating demodulation technology is the gordian technique that Fibre Optical Sensor is applied.High speed optic fiber grating sensor-based system is mainly used in the detection that the high speed oscillator fields such as slewing close sensing amount, and the difficult point of high speed optic fiber grating demodulation is that speed is fast, and data volume is large, and often with light intensity variation on a large scale.Peak value test section is the key of high speed optic fiber grating demodulation, is improving accuracy of detection, in the time of detection speed, must reduce noise, gets rid of the interference that the irregular and light intensity variation of converted-wave etc. brings.These are that traditional demodulation system institute is insurmountable.
Utility model content
The purpose of this utility model is in order to overcome the defect of above-mentioned prior art, discloses a kind of high speed fiber grating demodulating system, can improve the stability of circuit, and effectively improve demodulation speed, has overcome the interference of optical noise for Wavelength demodulation.
The purpose of this utility model is achieved through the following technical solutions.
A kind of high speed fiber grating demodulating system of the present utility model is mainly comprised of FPGA demodulator circuit plate, reflective diffraction gratings spectrum demodulation module, control signal card extender, ASE light source, high-speed optical switch, photo-coupler, Switching Power Supply, host computer.High speed fiber grating demodulating system can be accessed by four road fiber-optic grating sensors, and accessible 6～8 sensors of each optical path.
Described FPGA demodulator circuit plate comprises FPGA processor, high speed analog signal Acquisition Circuit, filtering circuit, amplifying circuit, network communication interface circuit, SDRAM memory circuit, high-speed optical switch control circuit, power supply conversion and mu balanced circuit, with network communication interface, photoswitch control interface, high speed analog signal acquisition interface, reflective diffraction gratings spectrum demodulation module control interface, power supply translation interface and power interface;
High speed analog signal acquisition interface on described FPGA demodulator circuit plate, reflective diffraction gratings spectrum demodulation module control interface and power supply translation interface are connected with reflective diffraction gratings spectrum demodulation module by control signal card extender.
High-speed optical switch is connected with ASE light source, reflective diffraction gratings spectrum demodulation module by photo-coupler, high-speed optical switch can be accessed by four road fiber-optic grating sensors, high-speed optical switch control interface is connected with the photoswitch control interface of FPGA demodulator circuit plate control, by FPGA demodulator circuit plate, export different control signals and can select respectively four road fiber-optic grating sensor demodulation, or Dui Si road fiber-optic grating sensor demodulation continuously.
Described high speed analog signal Acquisition Circuit, utilizes difference channel, through high-pass filtering, low-pass filtering, signal, amplifies and Shape correction, and the simulating signal after processing is sent into FPGA processor.
Described FPGA demodulator circuit plate is connected with reflective diffraction gratings spectrum demodulation module by reflective diffraction gratings spectrum demodulation module control interface, gather spectrum original signal and transfer data to host computer by netting twine, upper computer software carries out Wavelength demodulation and shows.
Described FPGA processor and peripheral circuit thereof are exported control signal by control signal interface to reflective diffraction gratings spectrum demodulation module, it is started working, by high speed analog signal Acquisition Circuit, gather spectrum original signal and carry out filtering, amplify, by 100 m ethernet, be transferred to host computer again, upper computer software is demodulated fiber-optic grating sensor centre wavelength and is shown by peak-seeking and fitting algorithm.
The conversion of described power supply and mu balanced circuit be input as 220V alternating current, Switching Power Supply is respectively ASE light source and the power supply of FPGA demodulator circuit plate, power supply conversion and mu balanced circuit are output as the peripheral circuit of FPGA processor and processor, high-speed optical switch, high speed analog signal Acquisition Circuit, network communication interface circuit, SDRAM memory circuit.
Described upper computer software is used the virtual instrument technique software LabVIEW of American National instrument (NI) company, open after software, first equipment is carried out to initialization and initial interrogation, if initialization failure, can be according to information, the reason of finding out initialization failure, then reinitializes.
After initialization success, need to carry out the setting of parameter, according to test, need to carry out the setting of sample frequency, acquisition software arranges subroutine, can operate by clicking the menu item that arranges at main interface.
And then by peak-seeking matching and demodulating algorithm, calculate wavelength data and show, the switching state by channel selecting subroutine selective light switch, can be fixed in a certain passage, also can realize the automatic switchover at certain hour interval.
By selecting each sensor check box of different channel numbers required wavelength to be presented in the waveform chart at main interface, can be by clicking the event response of the drawing area trigger port chooser program of waveform chart.
For the ease of analysis and the post-processed of experimental data, high speed fiber grating demodulating system has data storage function, the data of collection can be kept on the hard disk path of setting, is convenient to the analysis of experimental result; By clicking the store button at main interface, start to store, and to start the time called after " date Hour Minute Second " of depositing, the file layout of storage can be chosen as text document or Excel document.
Beneficial effect
A kind of high speed fiber grating demodulating system demodulation speed of the present utility model is high, effectively overcome the interference that irregular and light intensity variation of waveform etc. brings, and level of integrated system is high, and cost is low, simple in structure, easy to operate, and man-machine interaction is good.Can store many group demodulation data, and enquiry of historical data.And can carry out module expansion, access branched Sensor monitoring simultaneously and unify and control.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of high speed fiber grating demodulating system;
Fig. 2 is the schematic diagram of reflective diffraction gratings spectrum demodulation module.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described further.
Embodiment
A high speed fiber grating demodulating system, its structural drawing as shown in Figure 1, by FPGA demodulator circuit plate, reflective diffraction gratings spectrum demodulation module, ASE light source, high-speed optical switch, photo-coupler, Switching Power Supply, host computer forms.High speed fiber grating demodulating system can be accessed by four road fiber-optic grating sensors, and accessible 6～8 sensors of each optical path.
Described FPGA demodulator circuit plate comprises FPGA processor, high speed analog signal Acquisition Circuit, filtering circuit, amplifying circuit, network communication interface circuit, SDRAM memory circuit, high-speed optical switch control circuit, power supply conversion and mu balanced circuit, with network communication interface, photoswitch control interface, high speed analog signal acquisition interface, reflective diffraction gratings spectrum demodulation module control interface, power supply translation interface and power interface;
High speed analog signal acquisition interface on FPGA demodulator circuit plate, reflective diffraction gratings spectrum demodulation module control interface is connected with reflective diffraction gratings spectrum demodulation module by control signal card extender with power supply translation interface.
High-speed optical switch is by photo-coupler and ASE light source, reflective diffraction gratings spectrum demodulation module connects, high-speed optical switch can be accessed by four road fiber-optic grating sensors, high-speed optical switch control interface is connected with FPGA demodulator circuit plate control interface, by FPGA demodulator circuit plate, export different control signals and can select respectively four road fiber-optic grating sensor demodulation, or Dui Si road fiber-optic grating sensor demodulation continuously.
High speed analog signal Acquisition Circuit, utilizes difference channel, through high-pass filtering, low-pass filtering, signal, amplifies and Shape correction, and the simulating signal after processing is sent into FPGA processor.
FPGA demodulator circuit plate is connected with reflective diffraction gratings spectrum demodulation module by control interface, gathers spectrum original signal and transfers data to host computer by netting twine, and upper computer software carries out Wavelength demodulation and shows.
FPGA processor and peripheral circuit thereof are exported control signal by control signal interface to reflective diffraction gratings spectrum demodulation module, it is started working, by high speed analog signal Acquisition Circuit, gather spectrum original signal and carry out filtering, amplify, by 100 m ethernet, be transferred to host computer again, upper computer software is demodulated fiber-optic grating sensor centre wavelength and is shown by peak-seeking and fitting algorithm, and reflective diffraction gratings spectrum demodulation module fundamental diagram as shown in Figure 2.
Power supply conversion and mu balanced circuit be input as 220V alternating current, Switching Power Supply is respectively ASE light source and the power supply of FPGA demodulator circuit plate, power supply conversion and mu balanced circuit are output as the peripheral circuit of FPGA processor and processor, high-speed optical switch, high speed analog signal Acquisition Circuit, network communication interface circuit, SDRAM memory circuit.
Above-mentioned host computer is with the desktop computer of network communication interface or notebook computer;
Above-mentioned FPGA processor model is EP2C8Q208;
The master chip of above-mentioned network communication interface circuit is DM9000BEP;
Above-mentioned high speed analog signal Acquisition Circuit master chip model is AD7626;
Upper computer software is used the virtual instrument technique software LabVIEW of American National instrument company, opens after software, first equipment is carried out to initialization and initial interrogation, if initialization failure, can find out the reason of initialization failure according to information, then reinitialize.
After initialization success, need to carry out the setting of parameter, according to test, need to carry out the setting of sample frequency, acquisition software arranges subroutine, can operate by clicking the menu item that arranges at main interface.
And then by peak-seeking matching and demodulating algorithm, calculate wavelength data and show, the switching state by channel selecting subroutine selective light switch, can be fixed in a certain passage, also can realize the automatic switchover at certain hour interval.
By selecting each sensor check box of different channel numbers required wavelength to be presented in the waveform chart at main interface, can be by clicking the event response of the drawing area trigger port chooser program of waveform chart.
High speed fiber grating demodulating system has data storage function, the data of collection can be kept on the hard disk path of setting, is convenient to the analysis of experimental result; By clicking the store button at main interface, start to store, and to start the time called after " date Hour Minute Second " of depositing, the file layout of storage can be chosen as text document or Excel document.
The above is preferred embodiment of the present utility model, and the utility model should not be confined to the disclosed content of this embodiment and accompanying drawing.Everyly do not depart from the equivalence completing under spirit disclosed in the utility model or revise, all falling into the scope of the utility model protection.
Claims (3)
1. a high speed fiber grating demodulating system, is characterized in that:
Mainly by FPGA demodulator circuit plate, reflective diffraction gratings spectrum demodulation module, control signal card extender, ASE light source, high-speed optical switch, photo-coupler, Switching Power Supply, host computer, formed; High speed fiber grating demodulating system can be accessed by four road fiber-optic grating sensors, and accessible 6～8 sensors of each optical path;
Described FPGA demodulator circuit plate comprises FPGA processor, high speed analog signal Acquisition Circuit, filtering circuit, amplifying circuit, network communication interface circuit, SDRAM memory circuit, high-speed optical switch control circuit, power supply conversion and mu balanced circuit, with network communication interface, photoswitch control interface, high speed analog signal acquisition interface, reflective diffraction gratings spectrum demodulation module control interface, power supply translation interface and power interface;
High speed analog signal acquisition interface on described FPGA demodulator circuit plate, reflective diffraction gratings spectrum demodulation module control interface and power supply translation interface are connected with reflective diffraction gratings spectrum demodulation module by control signal card extender.
2. a kind of high speed fiber grating demodulating system according to claim 1, is characterized in that:
High-speed optical switch is connected with ASE light source, reflective diffraction gratings spectrum demodulation module by photo-coupler, high-speed optical switch can be accessed by four road fiber-optic grating sensors, high-speed optical switch control interface is connected with the photoswitch control interface of FPGA demodulator circuit plate control, by FPGA demodulator circuit plate, export different control signals and can select respectively four road fiber-optic grating sensor demodulation, or Dui Si road fiber-optic grating sensor demodulation continuously;
Described high speed analog signal Acquisition Circuit, utilizes difference channel, through high-pass filtering, low-pass filtering, signal, amplifies and Shape correction, and the simulating signal after processing is sent into FPGA processor;
Described FPGA demodulator circuit plate is connected with reflective diffraction gratings spectrum demodulation module by reflective diffraction gratings spectrum demodulation module control interface, gather spectrum original signal and transfer data to host computer by netting twine, upper computer software carries out Wavelength demodulation and shows;
Described FPGA processor and peripheral circuit thereof are exported control signal by control signal interface to reflective diffraction gratings spectrum demodulation module, it is started working, by high speed analog signal Acquisition Circuit, gather spectrum original signal and carry out filtering, amplify, by 100 m ethernet, be transferred to host computer again, upper computer software is demodulated fiber-optic grating sensor centre wavelength and is shown by peak-seeking and fitting algorithm;
The conversion of described power supply and mu balanced circuit be input as 220V alternating current, Switching Power Supply is respectively ASE light source and the power supply of FPGA demodulator circuit plate, power supply conversion and mu balanced circuit are output as the peripheral circuit of FPGA processor and processor, high-speed optical switch, high speed analog signal Acquisition Circuit, network communication interface circuit, SDRAM memory circuit.
3. a kind of high speed fiber grating demodulating system according to claim 1, is characterized in that: described host computer is with the desktop computer of networking communication interface or notebook computer.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105628173A (en) * | 2015-12-30 | 2016-06-01 | 山东省科学院激光研究所 | Hydropower station set vibration measurement monitoring device based on optical fiber sensing |
| CN105698836A (en) * | 2016-02-04 | 2016-06-22 | 昆明理工光智检测科技有限公司 | Optical fiber Bragg raster sensing net-based on-line monitoring method |
| CN105758521A (en) * | 2015-10-14 | 2016-07-13 | 北京信息科技大学 | Fiber grating demodulation system and method using micro grating to improve spectral resolution |
| CN107631741A (en) * | 2017-08-29 | 2018-01-26 | 北京航空航天大学 | A kind of implementation method of fiber Bragg grating sensor Wavelength demodulation |
| CN108572285A (en) * | 2018-03-26 | 2018-09-25 | 北京航空航天大学 | A kind of high speed photo coupling screening technique based on low-frequency broadband noise |
| CN108680193A (en) * | 2018-04-18 | 2018-10-19 | 中山水木光华电子信息科技有限公司 | A kind of optical fiber code recognition methods based on light splitting matrix demodulation |
| CN108880684A (en) * | 2018-05-22 | 2018-11-23 | 中山水木光华电子信息科技有限公司 | A method of the identification of full light and operation based on optical fiber code |
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2013
- 2013-08-08 CN CN201320481178.3U patent/CN203519025U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105758521A (en) * | 2015-10-14 | 2016-07-13 | 北京信息科技大学 | Fiber grating demodulation system and method using micro grating to improve spectral resolution |
| CN105628173A (en) * | 2015-12-30 | 2016-06-01 | 山东省科学院激光研究所 | Hydropower station set vibration measurement monitoring device based on optical fiber sensing |
| CN105628173B (en) * | 2015-12-30 | 2018-09-28 | 山东省科学院激光研究所 | Hydropower Plant vibration measurement monitoring device based on Fibre Optical Sensor |
| CN105698836A (en) * | 2016-02-04 | 2016-06-22 | 昆明理工光智检测科技有限公司 | Optical fiber Bragg raster sensing net-based on-line monitoring method |
| CN107631741A (en) * | 2017-08-29 | 2018-01-26 | 北京航空航天大学 | A kind of implementation method of fiber Bragg grating sensor Wavelength demodulation |
| CN108572285A (en) * | 2018-03-26 | 2018-09-25 | 北京航空航天大学 | A kind of high speed photo coupling screening technique based on low-frequency broadband noise |
| CN108572285B (en) * | 2018-03-26 | 2019-12-31 | 北京航空航天大学 | High-speed optocoupler screening method based on low-frequency broadband noise |
| CN108680193A (en) * | 2018-04-18 | 2018-10-19 | 中山水木光华电子信息科技有限公司 | A kind of optical fiber code recognition methods based on light splitting matrix demodulation |
| CN108880684A (en) * | 2018-05-22 | 2018-11-23 | 中山水木光华电子信息科技有限公司 | A method of the identification of full light and operation based on optical fiber code |
| CN108880684B (en) * | 2018-05-22 | 2020-12-15 | 中山水木光华电子信息科技有限公司 | All-optical recognition and operation method based on optical fiber coding |
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