CN107014478B - Modulation-demodulation device for optical fiber vector hydrophone - Google Patents
Modulation-demodulation device for optical fiber vector hydrophone Download PDFInfo
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- CN107014478B CN107014478B CN201710229315.7A CN201710229315A CN107014478B CN 107014478 B CN107014478 B CN 107014478B CN 201710229315 A CN201710229315 A CN 201710229315A CN 107014478 B CN107014478 B CN 107014478B
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 64
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- 239000000835 fiber Substances 0.000 claims abstract description 16
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- 230000003321 amplification Effects 0.000 claims description 8
- 238000001208 nuclear magnetic resonance pulse sequence Methods 0.000 claims description 8
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/002—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means for representing acoustic field distribution
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
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- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The invention discloses a kind of modulation-demodulation devices for optical fiber vector hydrophone, disclosed device includes optical transmitter module and optical receiver module, wherein: the optical transmitter module is connect, for providing modulated light source for optical fiber vector hydrophone with optical fiber vector hydrophone by transmission fiber；Optical transmitter module includes laser, PGC modulation circuit and pulse-modulator；The optical receiver module is connect by transmission fiber with optical fiber vector hydrophone, and for the interference light signal that reception optical fiber vector hydrophone issues, demodulation obtains the underwater acoustic field signal in optical signal, carries out information exchange with external equipment；Optical receiver module includes photoelectric conversion unit, AD conversion unit and signal processing unit.The stability of optical fiber vector hydrophone output signal is improved by PGC modulation /demodulation, to further increase the accuracy of underwater sound field vector signal detection.
Description
Technical field
The present invention relates to technical field of optical fiber sensing more particularly to a kind of modulation /demodulation for optical fiber vector hydrophone
Device.
Background technique
As China is to the pay attention to day by day of ocean development and underwater early warning, carry out underwater acoustic detection system technical research and engineering
Application study have become there is an urgent need to.Underwater sound field is the important observation element of ocean section research and Underwater Target Detection, in object
In reason, underwater sound field is vector field, the scalar sum vector signal obtained by vector hydrophone, may be implemented to carry out sound field complete
Description.Vector hydrophone generation underwater for research sound wave, radiation, propagation and received rule, solution and submarine target
Detection, identification and the related sound problem of signals transmission are of great significance.In recent years based on fibre optic hydrophone
Underwater Detection technology has obtained development rapidly, and the developed countries such as U.S. detect battle array in submarine shell side cooler, towed array and subsurface buoy
Start to equip in sonar, wherein the appearance of optical fiber vector hydrophone solves the problems, such as that it is new that Underwater Detection provides with fast-developing
Technological approaches.
Optical fiber vector hydrophone combines the advantages of vector hydrophone and fibre optic hydrophone, has high sensitivity, and low frequency is special
Property good, the features such as dynamic range is big, and underwater operation stability is high, resistance to severe ring, border, be conducive to the long-term detection to underwater sound field,
It can be applied not only to target acquisition, also illustrate wide application in important fields such as submarine observation network, offshore oil detections
Prospect.Tested underwater sound field vector signal is converted into optical signal by optical fiber vector hydrophone, and reaches processing system by transmission cable
System extracts underwater sound field information, since measured signal is to be modulated at interference-type optical fiber vector hydrophone output letter in the form of phase information
In number, it is necessary to carry out modulating and demodulating signal and just be able to achieve the reduction of underwater sound field vector signal.It is right in the application of underwater sound field vector signal
The stability of each three-dimensional component amplitude of optical fiber vector hydrophone has higher requirement.
Therefore the stability of optical fiber vector hydrophone output signal how is improved, to further increase underwater sound field arrow
The accuracy for measuring detection, becomes those skilled in the art's urgent problem to be solved.
Summary of the invention
The technical problem to be solved by the present invention is to overcome drawbacks described above of the existing technology, provide a kind of for optical fiber
The modulation-demodulation device of vector hydrophone, can be improved the stability of optical fiber vector hydrophone output signal, to further mention
The accuracy of high underwater sound field vector signal detection.
The present invention is provided to the modulation-demodulation devices of optical fiber vector hydrophone, including optical transmitter module and light-receiving mould
Block, in which:
The optical transmitter module is connect by transmission fiber with optical fiber vector hydrophone, for being optical fiber vector hydrophone
Modulated light source is provided；Optical transmitter module includes laser, PGC modulation circuit and pulse-modulator, in which:
Laser provides light source for emitting laser, and carries out optical frequency modulation by the cosine-modulation signal of PGC modulation circuit
Laser of frequency modulation is sent to pulse-modulator afterwards；
PGC modulation circuit, for generating, cosine-modulation signal is sent to laser and generation pulse-modulated signal is sent to
Pulse-modulator；
Pulse-modulator, the frequency modulated light signal for exporting laser carry out impulse modulation, generate light pulse sequence hair
Give optical fiber vector hydrophone；
The optical receiver module is connect by transmission fiber with optical fiber vector hydrophone, comes from optical fiber vector for receiving
The interference light signal of hydrophone, demodulation obtains the underwater acoustic field signal in optical signal, and carries out information exchange with external equipment；Light connects
Receiving module includes photoelectric conversion unit, AD conversion unit and signal processing unit, in which:
Photoelectric conversion unit is converted to analog telecommunications for receiving the interference light signal of laser fiber vector hydrophone
Number, it is sent to AD conversion unit；
AD conversion unit is sent to letter for received electric signal to be converted to digital electric signal from analog electrical signal
Number processing unit；
Signal processing unit carries out information exchange with external equipment for digital electric signal to be demodulated into underwater acoustic field signal.
Preferably, the optical transmitter module further includes isolator, for the reflection returned from optical fiber vector hydrophone to be isolated
Light.
Preferably, the optical transmitter module further includes gain control amplifying circuit, and laser controls amplification electricity by gain
Road is connect with PGC modulation circuit, for inhibiting the drift of optical frequency modulation efficiency in light source.
Preferably, it is specially the light pulse sequence for meeting time division multiplexing duty ratio that the pulse-modulator, which generates light pulse sequence,
Column.
Preferably, the laser is the semiconductor laser of narrow line width regulatable, and PGC modulation circuit is fpga chip,
Pulse-modulator is SOA modulator.
Preferably, the optical receiver module further includes light intensity automatic control module, is sent out for reception optical fiber vector hydrophone
The interference light signal sent, and according to the amplitude of preset condition adjusting optical signal, the optical signal after adjusting is sent to photoelectric conversion
Unit.
Preferably, the light intensity automatic control module is AGC ring.
Preferably, the signal processing unit is fpga chip and dsp chip.
Preferably, the optical receiver module further includes Network Interface Module, and signal processing unit passes through Network Interface Module
Information exchange is carried out with external equipment.
Optical fiber vector hydrophone work is supplied to after optical signal is carried out optical frequency modulation and impulse modulation by PGC modulation module
For light source, the interference light signal that optical fiber vector hydrophone generates is demodulated into underwater sound field by photoelectric conversion, analog-to-digital conversion and PGC
Signal improves optical fiber vector hydrophone stable output signal by PGC modulation /demodulation, to further increase the water of extraction
The accuracy of sound field information.Detailed description of the invention
Fig. 1 is a kind of structural block diagram of the modulation-demodulation device for optical fiber vector hydrophone provided by the invention.
Specific embodiment
In order that those skilled in the art will better understand the technical solution of the present invention, with reference to the accompanying drawing to the present invention
It is described in further detail.
It is a kind of structural block diagram of the modulation-demodulation device for optical fiber vector hydrophone provided by the invention referring to Fig. 1.
The present invention is provided to the modulation-demodulation devices of optical fiber vector hydrophone, including optical transmitter module 20 and light-receiving mould
Block 30, in which:
The optical transmitter module 20 is connect by transmission fiber with optical fiber vector hydrophone 10, for being optical fiber vector water
Device 10 is listened to provide modulated light source；Optical transmitter module 20 includes laser 21, PGC modulation circuit 22 and pulse-modulator 23,
Wherein:
Laser 21 provides light source for emitting laser, and carries out optical frequency by the cosine-modulation signal of PGC modulation circuit 22
Laser of frequency modulation is sent to pulse-modulator 23 after modulation；
PGC modulation circuit 22 is sent to laser 21 and generation pulse-modulated signal hair for generating cosine-modulation signal
Give pulse-modulator 23；
Pulse-modulator 23, the frequency modulated light signal for exporting laser 21 carry out impulse modulation, generate light pulse sequence
Column are sent to optical fiber vector hydrophone 10；
The optical receiver module 30 is connect by transmission fiber with optical fiber vector hydrophone 10, comes from optical fiber for receiving
The interference light signal of vector hydrophone 10, demodulation obtains the underwater acoustic field signal in optical signal, and carries out information friendship with external equipment
Mutually；Optical receiver module 30 includes photoelectric conversion unit 31, AD conversion unit 32 and signal processing unit 33, in which:
Photoelectric conversion unit 31 is converted to simulation for receiving the interference light signal of laser fiber vector hydrophone 10
Electric signal is sent to AD conversion unit 32；
AD conversion unit 32 is sent to signal processing for received analog electrical signal to be converted to digital electric signal
Unit 33；
Signal processing unit 33 carries out information with external equipment for digital electric signal PGC to be demodulated into underwater acoustic field signal
Interaction.
The PGC modulation circuit 22 of optical transmitter module 20 generates cosine-modulation signal and pulse-modulated signal, to laser 21
The optical signal of transmitting carries out optical frequency modulation and impulse modulation.Modulated optical signal is sent to optical fiber vector by transmission fiber
Hydrophone 10.Optical fiber vector hydrophone 10 detects the interference light signal that position to be measured generates, and passes light-receiving back by transmission fiber
Module 30, interference light signal pass sequentially through at the photoelectric conversion unit 31, AD conversion unit 32 and signal of optical receiver module 30
Interference light signal photoelectric conversion, analog-to-digital conversion and PGC are demodulated into underwater acoustic field signal by reason unit 33, and by final result and outside
Portion's equipment interacts.PGC, Phase Generated Carrier, i.e. phase generate carrier technology, have demodulation simply, right
The small feature of hardware requirement.Optical fiber arrow is supplied to after optical signal is carried out optical frequency modulation and impulse modulation by PGC modulation module
Hydrophone is measured as light source, the interference light signal that optical fiber vector hydrophone generates passes through photoelectric conversion, analog-to-digital conversion and PGC solution
It is adjusted to underwater acoustic field signal, the stability of optical fiber vector hydrophone output signal is improved by PGC modulation /demodulation, thus further
Improve the accuracy for the underwater sound field information extracted.
Further explanation in detail will be carried out to optical transmitter module 20 and optical receiver module 30 below.
Optical transmitter module 20 includes laser 21, PGC modulation circuit 22 and pulse-modulator 23.The laser 21 is narrow
The semiconductor laser that line width is tunable, PGC modulation circuit 22 are FPGA(Field-Programmable Gate Array,
That is field programmable gate array) chip, pulse-modulator 23 is SOA(Semiconductor Optical Amplifier) line
Property semiconductor optical amplifier) modulator.Cosine-modulation signal is generated by fpga chip, the semiconductor of narrow line width regulatable is swashed
The optical frequency of light device carries out cosine-modulation, and the modulated optical signal of optical frequency is passed through single polarization maintaining optical fibre input pulse modulator.
Fpga chip generates pulse-modulated signal, carries out impulse modulation to the modulated optical signal of optical frequency in pulse-modulator, generates
The light pulse sequence for meeting time division multiplexing duty ratio, is sent to optical fiber vector hydrophone by transmission fiber, and successively beam splitting is injected
The each channel of vector probe of optical fiber vector hydrophone.
Laser noise is system Main Noise Sources, including light source frequency noise and light source intensity noise.Low noise light source
Selection it is most important for the noise control of whole device.Thus use small in size, small power consumption, the narrow linewidth of low noise light source
Tunable semiconductor laser.
The optical transmitter module 20 further includes isolator 24, for the reflection returned from optical fiber vector hydrophone 40 to be isolated
Light makes laser 21 be not reflected optical disturbance.
In order to further increase cosine-modulation signal stabilization, the optical transmitter module 20 further includes gain control amplification electricity
Road 25, laser 21 control amplifying circuit 25 by gain and connect with PGC modulation circuit 22, for inhibiting optical frequency in light source to modulate
The drift of efficiency.
PGC modulation circuit 22 exports the amplitude stabilization of cosine-modulation signal itself and adjustable, to the light source tune of laser 21
When processed, there is biggish drift with parameters such as temperature in modulation efficiency, it is therefore desirable to control amplifying circuit 25 by adjusting gain
Control voltage carry out feedback regulation.The gain of gain control amplifying circuit 25 changes with control voltage.Gain control amplification
For the output signal U o of circuit 25 through detection and after filter filters out low frequency modulations component and noise, output to light source carries out optical frequency
Modulation, optical frequency modulated signal reflect that into the interference signal of optical fiber vector hydrophone, optical receiver module is obtained from interference signal
After the fluctuation of the optical frequency modulation efficiency of light source, generated in a manner of negative-feedback control voltage Uc export give gain control amplifying circuit
25.When optical receiver module monitors that the drift of optical frequency modulation efficiency becomes larger, control Uc becomes smaller and the gain of amplifying circuit is made to become smaller,
Uo also becomes smaller therewith, otherwise when optical receiver module monitors that the drift of optical frequency modulation efficiency becomes smaller, control Uc, which becomes larger, makes amplification electricity
The gain on road becomes larger, and Uo also becomes larger therewith, this negative feedback process makes at the interference signal modulation parameter of optical fiber vector hydrophone
In stable state, achieve the purpose that automatic growth control.Gain controls amplifying circuit 25 using the program-controlled increasing of AD602 of ADI company
Beneficial chip is realized.AD602 chip is a variable gain amplification chip.The chip noise and distortion rate are low.Bandwidth be 0 ~
35MHZ meets bandwidth demand.Amplification factor adjustable extent is between -10dB -30dB.Voltage is controlled by changing, is able to achieve
Accurate control to chip entirety amplification factor controls precision in ± 0.3dB.
The signal processing unit 33 of optical receiver module 30 is fpga chip and DSP(Digital Signal Processing
Digital Signal Processing) chip.Dsp chip is soared Q6713 chip using the domestic milky way.
In order to further increase input interference light signal stability, the optical receiver module 30 further includes that light intensity automatically controls
Module 34, the range stability of the interference light signal for controlling optical fiber vector hydrophone adjust optical signal according to preset condition
Amplitude, the optical signal after adjusting is sent to photoelectric conversion unit.
For inputting interference light signal, when the signal gets too small, when signal carries out analog-to-digital conversion, quantizing noise can be excessive, letter
It makes an uproar than decline.When signal is excessive, since there are maximum output voltages for amplifier, saturation distortion will lead to.When input interference light
When signal becomes smaller, that is, when being less than interference light signal intensity preset range, light intensity automatic control module 34 improves gain, guarantees input
Optical signal after adjusting is sent to photoelectric conversion unit 31 by the intensity of interference light signal；When input interference light signal intensity mistake
When big, that is, when being greater than interference light signal intensity preset range, light intensity automatic control module 34 reduces gain, makes to input interference light letter
Number light intensity reduces, and the optical signal after adjusting is sent to photoelectric conversion unit 31, to make to input interference light signal by photoelectricity
It is maintained in the linear zone of the response of signal processing unit 33 after converting unit 31, the processing of AD conversion unit 32.That is, can
To automatically control the amplitude of the gain of light and decaying by changing input and output compression factor, it can change in input signal amplitude
In biggish situation, amplitude output signal is made to keep constant or only change in smaller range, is unlikely to because of input signal too
It is small and Demodulation Systems noise is caused to become larger, also it is unlikely to be saturated receiving end because input signal is too big.Interference light letter
Number intensity preset range is obtained by design and experiment, guarantees that 33 input signal of signal processing unit can make signal processing unit 33
Response is in linear zone.
34 circuit of light intensity automatic control module uses AGC(Auto Gain Control, automatic growth control) ring, AGC ring
It is closed loop circuit, is a degeneration factor.It can keep passing through light intensity when interference light signal light intensity fluctuates in a big way
Automatic control module 34 exports stable optical signal, to reduce the fluctuating of 33 input signal amplitude of signal processing unit to demodulation
As a result influence.The MEMS(Micro electro mechanical of the selection of light intensity automatic control module 34 Wuhan GuangXun Co., Ltd
System, MEMS) optical attenuator realization.
The optical receiver module 30 further includes Network Interface Module 35, and signal processing unit 33 passes through Network Interface Module 35
Information exchange is carried out with external equipment.Network Interface Module 35 includes network interface chip and network interface, due to network interface
The convenience used establishes the signal transfer mechanisms based on 100 m ethernet.
Detailed Jie has been carried out to a kind of modulation-demodulation device for optical fiber vector hydrophone provided by the present invention above
It continues.Used herein a specific example illustrates the principle and implementation of the invention, and the explanation of above embodiments is only
It is to be used to help understand core of the invention thought.It should be pointed out that for those skilled in the art, not
, can be with several improvements and modifications are made to the present invention under the premise of being detached from the principle of the invention, these improvement and modification are also fallen into
In the protection scope of the claims in the present invention.
Claims (7)
1. a kind of modulation-demodulation device for optical fiber vector hydrophone, which is characterized in that including optical transmitter module and light-receiving
Module, in which:
The optical transmitter module is connect, for providing for optical fiber vector hydrophone with optical fiber vector hydrophone by transmission fiber
Modulated light source；Optical transmitter module includes laser, PGC modulation circuit, isolator, gain control amplifying circuit and pulse tune
Device processed, in which:
Laser provides light source for emitting laser, and incites somebody to action after carrying out optical frequency modulation by the cosine-modulation signal of PGC modulation circuit
Laser of frequency modulation is sent to pulse-modulator；
PGC modulation circuit, for generating, cosine-modulation signal is sent to laser and generation pulse-modulated signal is sent to pulse
Modulator；
Pulse-modulator, the frequency modulated light signal for exporting laser carry out impulse modulation, generate light pulse sequence and are sent to
Optical fiber vector hydrophone；
Isolator, for the reflected light returned from optical fiber vector hydrophone to be isolated；
Gain controls amplifying circuit, and laser controls amplifying circuit by gain and connect with PGC modulation circuit, gain control amplification
Circuit is also connect with optical receiver module, the PGC modulation electricity that the control voltage adjustment for being sent according to optical receiver module is sent to
The output voltage on road inhibits the drift of optical frequency modulation efficiency in light source；
The optical receiver module is connect by transmission fiber with optical fiber vector hydrophone, is listened for receiving from optical fiber vector water
The interference light signal of device, demodulation obtains the underwater acoustic field signal in optical signal, and carries out information exchange with external equipment；From from light
After the fluctuation for obtaining the optical frequency modulation efficiency of light source in the interference light signal of fine vector hydrophone, control is generated in a manner of negative-feedback
Voltage processed is sent to gain control amplifying circuit, and optical receiver module includes at photoelectric conversion unit, AD conversion unit and signal
Manage unit, in which:
Photoelectric conversion unit is converted to analog electrical signal, sends out for receiving the interference light signal of laser fiber vector hydrophone
Give AD conversion unit；
AD conversion unit is sent to signal processing unit for received analog electrical signal to be converted to digital electric signal；
Signal processing unit carries out information exchange with external equipment for digital electric signal to be demodulated into underwater acoustic field signal.
2. the modulation-demodulation device according to claim 1 for optical fiber vector hydrophone, which is characterized in that the pulse
It is specially the light pulse sequence for meeting time division multiplexing duty ratio that modulator, which generates light pulse sequence,.
3. the modulation-demodulation device according to claim 2 for optical fiber vector hydrophone, which is characterized in that the laser
Device is the semiconductor laser of narrow line width regulatable, and PGC modulation circuit is fpga chip, and pulse-modulator is SOA modulator.
4. according to claim 1 to the modulation-demodulation device for optical fiber vector hydrophone of 3 any one, feature exists
In the optical receiver module further includes light intensity automatic control module, the interference light letter sent for reception optical fiber vector hydrophone
Number, and according to the amplitude of preset condition adjusting optical signal, the optical signal after adjusting is sent to photoelectric conversion unit.
5. the modulation-demodulation device according to claim 4 for optical fiber vector hydrophone, which is characterized in that the light intensity
Automatic control module is AGC ring.
6. the modulation-demodulation device according to claim 5 for optical fiber vector hydrophone, which is characterized in that the signal
Processing unit is fpga chip and dsp chip.
7. the modulation-demodulation device according to claim 6 for optical fiber vector hydrophone, which is characterized in that the light connects
Receiving module further includes Network Interface Module, and signal processing unit carries out information exchange by Network Interface Module and external equipment.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108519146B (en) * | 2018-03-29 | 2019-03-22 | 中国人民解放军国防科技大学 | Optical fiber vector hydrophone demodulation system based on ZYNQ series FPGA |
| CN110716065B (en) * | 2019-10-31 | 2022-01-25 | 湖南长城海盾光纤科技有限公司 | Flow velocity measurement system and method based on optical fiber vector hydrophone |
| CN111928935A (en) * | 2020-07-31 | 2020-11-13 | 中科长城海洋信息系统有限公司 | Optical power automatic control device for optical fiber hydrophone sensing array |
| WO2023051554A1 (en) * | 2021-09-29 | 2023-04-06 | 欧梯恩智能科技(苏州)有限公司 | Optical sensing demodulation module and optical sensing system |
| CN116047526B (en) * | 2023-03-29 | 2023-06-09 | 中国人民解放军国防科技大学 | Superfine continuous optical fiber towed sonar and underwater mobile platform |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB9901965D0 (en) * | 1999-01-29 | 1999-03-17 | Geo Sensor Corp | Angle demodulation |
| US7339678B2 (en) * | 2005-11-09 | 2008-03-04 | Northrop Grumman Corporation | Method and system of using odd harmonics for phase generated carrier homodyne |
| CN102095487B (en) * | 2010-11-10 | 2013-02-13 | 中国科学院声学研究所 | Optical path structure of time-division-multiplexing optical fiber hydrophone array and modulation and demodulation method thereof |
| CN202075031U (en) * | 2011-03-24 | 2011-12-14 | 中国电子科技集团公司第二十三研究所 | Optical fiber grating hydrophone and phase demodulating device thereof |
| CN102359797B (en) * | 2011-07-08 | 2014-05-07 | 清华大学 | System and method for reducing noise of phase generated carrier (PGC) system in optical fiber hydrophone |
| CN102680072B (en) * | 2012-05-09 | 2014-07-30 | 清华大学 | System and method for reducing noise of optical fiber hydrophone phase generated carrier (PGC) time division multiplexing system |
| CN204559587U (en) * | 2015-04-29 | 2015-08-12 | 桂林电子科技大学 | Laser frequency hopping causes sound digital communication system under water |
| CN205808543U (en) * | 2016-06-02 | 2016-12-14 | 长沙湘计海盾科技有限公司 | A kind of sound pressure sensitivity measurement apparatus of fibre optic hydrophone |
| CN106124029B (en) * | 2016-06-17 | 2020-12-29 | 中国人民解放军国防科学技术大学 | Optical fiber hydrophone system based on micro-nano optical fiber all-optical phase modulator |
| CN106052843B (en) * | 2016-08-09 | 2019-10-18 | 北京航天控制仪器研究所 | A kind of heterodyne interference type fibre optic hydrophone time division multiplexing array and demodulation method |
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