CN106768269A - Fiber-optic hydrophone system based on PGC principles - Google Patents
Fiber-optic hydrophone system based on PGC principles Download PDFInfo
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- CN106768269A CN106768269A CN201611053984.5A CN201611053984A CN106768269A CN 106768269 A CN106768269 A CN 106768269A CN 201611053984 A CN201611053984 A CN 201611053984A CN 106768269 A CN106768269 A CN 106768269A
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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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Abstract
The present invention relates to technical field of optical fiber measurement,It is specifically a kind of rational in infrastructure,Reliable operation,Measurement is accurately based on the fiber-optic hydrophone system of PGC principles,It is characterized in that being provided with modulation of source unit,Multi-wavelength monochromatic laser emissions unit,First power equalization unit,Wavelength division multiplexer,Pulse-modulator,First amplifier,Sensor array,Second amplifier,Solution wavelength division multiplexer,Second power equalization unit,Photoelectric conversion unit,Signal is demodulated and display unit,Wherein modulation of source unit is modulated to the continuous optical signal of multi-wavelength single-frequency that multi-wavelength monochromatic laser emissions unit is exported,Signal after modulation enters the first power equalization unit,The signal of the first power equalization unit output enters the input port of wavelength division multiplexer,The present invention is prevented from the interchannel crosstalk that the signal of different time-division sensor arrays is not enough caused due to isolation of system degree,Reduce adverse effect of the interchannel crosstalk to signal analysis.
Description
Technical field：
The present invention relates to technical field of optical fiber measurement, specifically a kind of rational in infrastructure, reliable operation, measurement are accurate
Fiber-optic hydrophone system based on PGC principles.
Background technology：
Fibre optic hydrophone is a kind of underwater signal sensor of foundation on optical fiber, optoelectronic technology base.It passes through
Highly sensitive optical coherence detection, optical signal is converted into by underwater sound vibration, and signal processing system extraction sound is reached by optical fiber
Signal message.It has sensitivity high, the features such as good frequency response.It is suitable remote big due to doing information carrier using optical fiber
Scope is monitored.Fibre optic hydrophone is mainly used in acoustic propagation, noise, reverberation, submarine acoustic characteristic, target in marine acoustics environment
The detection of acoustic characteristic etc., is Modern Navy anti-submarine warfare, the advanced detection means of underwater ordnance experiment.
Realize that over long distances, large scale array is passed using the scheme of different multiplex modes combination more than current fiber-optic hydrophone system
Sense, conventional multiplex mode includes wavelength-division multiplex, space division multiplexing etc., hydrophone system can be greatly increased using different multiplex modes
The sensing passage number of system, but by realizing the devices such as the wavelength division multiplexer WDM that wavelength-division multiplex, space division multiplexing are used, coupler
The otherness of part production, luminous power has a larger difference between different multiplex channels, the noise of influence signal demodulation when dynamic range.
Realize over long distances, large scale array sensing, in addition it is also necessary to detection optical signal of the power amplifier to input sensor array
It is amplified, while it is secondary to need preamplifier to carry out the interference light signal for carrying acoustic information that sensor array is returned
Amplify.But due to the saturation input power threshold value of general EDFA amplifier requirements signals at present it is relatively low (generally below-
10dBm), it is impossible to meet underwater acoustic system image intensifer near transmitting terminal, input power requirement higher and noise coefficient bigger than normal (
As for 5), simultaneously because uses of the EDFA as preamplifier of unintentional nonlinearity effect in sensor fibre, significantly limit value
Scope.Due to having used the modes such as wavelength-division multiplex, space division multiplexing, the time-division sensor array number included in sensor array gradually increases
Plus, because the isolation of time-division sensor array interchannel is inadequate, cause the signal cross-talk between different arrays to increase, seriously limit
Demodulation effect of the hydrophone in detection application.
The content of the invention：
The present invention is for shortcoming and defect present in prior art, it is proposed that a kind of rational in infrastructure, reliable operation, measurement
Accurately it is based on the fiber-optic hydrophone system of PGC principles.
The present invention can be reached by following measures：
A kind of fiber-optic hydrophone system based on PGC principles, it is characterised in that be provided with modulation of source unit, multi-wavelength single-frequency
Laser emission element, the first power equalization unit, wavelength division multiplexer, pulse-modulator, the first amplifier, sensor array, second
Amplifier, solution wavelength division multiplexer, the second power equalization unit, photoelectric conversion unit, signal demodulation and display unit, wherein light source
Modulating unit is modulated to the continuous optical signal of multi-wavelength single-frequency that multi-wavelength monochromatic laser emissions unit is exported, the letter after modulation
Number entrance the first power equalization unit, the signal of the first power equalization unit output enters the input port of wavelength division multiplexer, ripple
The output port of division multiplexer is connected with the input of pulse-modulator, and the output signal of pulse-modulator is by the first amplifier
Enhanced processing after send into sensor array, the output signal of sensor array sends into solution wavelength division multiplexer after being processed through the second amplifier
Input, solve wavelength division multiplexer output end be connected with the corresponding wavelength input port of the second power equalization unit, second
The output end of power equalization unit is connected with photoelectric conversion unit, and photoelectric conversion unit is connected with signal demodulation with display unit
Connect.
Sensor array of the present invention includes multigroup channel-splitting filter, time-division sensor array and wave multiplexer, and every group of time-division senses battle array
Row are corresponding with the monochromatic sources of a wavelength, and the COM port of channel-splitting filter is input port, and transmission port connects each group of time-division
The input of sensor array, reflector port connects the COM port of next channel-splitting filter, the output port connection of time-division sensor array
The transmission port of corresponding wavelength wave multiplexer, the COM port of wave multiplexer connects the reflector port of previous wave multiplexer.
Modulation of source unit of the present invention can simultaneously export the sinusoidal modulation signal on most 16 tunnels, modulation voltage letter
Number adjustable range be -4V~+4V, Frequency modulation range be 0~100KHz.
Multiwavelength laser transmitter unit of the present invention output according to ITU-T G.692 standard specify with C34 passages
Centered on, multiple wavelength optical signal of the line width less than 10KHz, output wavelength port number is less than 16.
The first power equalization unit and the second power equalization unit are same class functional unit in the present invention, comprising with many ripples
Laser emission element identical port number long, each passage connects an optics adjustable attenuator, and the optics adjustable attenuator can
To be the manual adjustable attenuator of mechanical optics, or micro electromechanical (MEMS) optics adjustable attenuator, can to any one
Controlled attenuator, its attenuation range should meet 0.7dB~40dB.
Wavelength division multiplexer of the present invention, solution wavelength division multiplexer are similar device, described wavelength division multiplexer, solution wavelength division multiplexer
Operation wavelength is identical with the wavelength number that multiwavelength laser transmitter unit is exported and corresponds, and centre wavelength precision is less than just
Negative 0.1nm, insertion loss is less than 4dB, and each interchannel isolation is not less than 30dB.
The operation wavelength of pulse-modulator of the present invention is 1550 ± 30nm, and working frequency is less than 120MHz, extinction ratio
More than 50dB, optical rise time is less than 50ns.
First amplifier of the invention is EDFA amplifiers, and input wavelength scope is 1529nm~1563nm, input optical power
Less than -5~5dBm, 0~13dBm of power output is adjustable, and input isolation is that, more than 40dB, noise figure is less than 4.5dB.
Sensor array of the present invention 7 is included and the wavelength number identical channel-splitting filter of multiwavelength laser transmitter unit 2, conjunction
Ripple device and time-division sensor array, each group of channel-splitting filter are that similar device and transmission peak wavelength are single with multiwavelength laser transmitting with wave multiplexer
First wavelength is corresponded, and centre wavelength precision is less than ± 0.2nm, and channel isolation is more than 30dB, and time-division sensor array is multiple
The fibre optic interferometer of cascade, can be Michelson formula or Mach-pool Dare formula etc., defeated in each group of time-division sensor array
Enter end and be equipped with a fibre optic isolater.
The second amplifier is fiber Raman amplifier in the present invention, and its operating wavelength range is 1520~1560nm, input
Reference optical power be -40~-10dBm, equivalent noise figure be less than -3dB, typical gains be less than 16dB, input, output end every
30dB is all higher than from degree.
Photoelectric conversion unit number of active lanes is identical with multiwavelength laser transmitter unit output wavelength number in the present invention, in it
Portion is integrated with the FET PIN detector and A/D conversion chip of respective number, and detector transimpedance is not less than
100KV/W ,-three dB bandwidth is less than 50MHz, and A/D conversion chip sample rate is not less than 100Msps, and precision is not less than
12bit。
Signal demodulation includes performing the computer of demodulating algorithm and its display software section with display unit in the present invention,
It is characterized in that the overall signal of the time-division sensor array of a certain specific wavelength of correspondence can be shown, time-division sensor array can be shown again
In it is specific sensing array element signal.
During present invention work, modulation of source unit is by output and multiwavelength laser transmitter unit wavelength number corresponding
Tentering value and frequency sine voltage signal, while entering line amplitude and frequency modulation(PFM) to multiwavelength laser transmitter unit, multi-wavelength swashs
Optical Transmit Unit send comprising multiple wavelength and modulated detection light is coupled into same optical fiber by wavelength division multiplexer
And entering pulse-modulator, it is the pulsed light with one fixed width that detection light is modulated into, and pulsed optical signals enter first and amplify
Device carries out power amplification, makes up the power attenuation in optical signal modulation, transmitting procedure, and the first amplifier has saturation higher defeated
Enter power, while the power output of the first amplifier need to be controlled, it is to avoid occur nonlinear effect in sensor array.By what is amplified
After pulsed optical signals enter sensor array, when the detection optical signal of different wave length enters corresponding by the channel-splitting filter of corresponding wavelength
Point sensor array, the hydrophone array element in time-division sensor array is detected after environmental sound signal by conjunction corresponding with channel-splitting filter
Ripple device returns to " dry end " and is demodulated and display.The detection optical signal for carrying voice signal is subject to the second light in transmitting procedure
The distributed air-defense of fiber amplifier, optical signal can be improved in the case where Signal-to-Noise is not reduced and enters solution wavelength division multiplexer
Power.Optical signal separates the light of different wave length after solving wavelength division multiplexer, by the second power equalization unit adjust into
Enter photoelectric conversion unit, by the signal entering signal demodulation after opto-electronic conversion and display unit, demodulate " green end " sensing battle array
Arrange the voice signal for obtaining and the spectrum information for showing signal.
The beneficial effects of the present invention are：1st, to employ two sets of power equalization units, i.e. first, second power equal for this programme
Weighing apparatus unit, can not only adjust different wave length laser input signal keep power it is essentially identical, while also dynamic regulation from
The signal power of each wavelength that sensor array is returned keeps basically identical, and the power that input signal is improved to greatest extent is consistent
Property.2nd, the present invention not only used the mode that power amplification combines with preamplifier and be carried out to detecting light and interference signal respectively
Amplify, the power of return signal light has been effectively ensured.Meanwhile, preamplifier employs the distributed air-defense side of raman amplifier
Case, while playing equal multiplication factor, noise can reduce 1.5dB, relatively conventional EDFA magnification schemes, effectively reduce and be
The noise level of system.3rd, the present invention exists " " incidence end of the time-division sensor array in sensor array devises isolation and is more than green end
The fibre optic isolater of 60dB, is prevented from the interchannel that the signal of different time-division sensor arrays is not enough caused due to isolation of system degree
Crosstalk, reduces adverse effect of the interchannel crosstalk to signal analysis.
Brief description of the drawings：
Accompanying drawing 1 is structured flowchart of the invention.
Accompanying drawing 2 is the structured flowchart of sensor array in the present invention.
Reference：Modulation of source unit 1, multi-wavelength monochromatic laser emissions unit 2, the first power equalization unit 3, wavelength-division
Multiplexer 4, pulse-modulator 5, the first amplifier 6, sensor array 7, the second amplifier 8, solution wavelength division multiplexer 9, the second power
Balanced unit 10, the demodulation of photoelectric conversion unit 11, signal and display unit 12, channel-splitting filter 13, time-division sensor array 14, wave multiplexer
15。
Specific embodiment：
The present invention is further illustrated below in conjunction with the accompanying drawings.
Modulation of source unit 1 of the present invention passes through output frequency and the variable sine voltage signal of amplitude, to multiwavelength laser
The continuous optical signal of multi-wavelength single-frequency of the output of transmitter unit 2 carries out carrier modulation, and modulated multi-wavelength signals enter first
Power equalization unit 3, the multi-wavelength signals processed by power equalization connect the input port of wavelength division multiplexer 4, wavelength-division multiplex
The output port of device 4 is connected with the input port of pulse-modulator 5, and the output port of pulse-modulator 5 is by the first amplifier 6
Amplification enter sensor array 7, sensor array 7 includes multigroup channel-splitting filter 13, time-division sensor array 14 and wave multiplexer 15, often
Group time-division sensor array is corresponding with the monochromatic sources of a wavelength, and the COM port of channel-splitting filter 13 is input port, transmission port
The input of each time-division sensor array is connected, reflector port connects the COM port of next channel-splitting filter.Time-division sensor array
The transmission port of 14 output port connection corresponding wavelength wave multiplexer 15, the COM port of wave multiplexer 15 connects previous wave multiplexer
Reflector port.The output end of sensor array 7 is connected by the second amplifier 8 with the input port of solution wavelength division multiplexer 9.Solution
The output port of wavelength division multiplexer 9 is connected with the corresponding wavelength input port of the second power equalization unit 10, by power equalization
Optical signal after treatment by photoelectric conversion unit 11 and signal demodulate with display unit 12, complete to the demodulation of voice signal with
Display；Described modulation of source unit 1 can simultaneously export the sinusoidal modulation signal on most 16 tunnels, the tune of the modulated voltage signal
Adjusting range is -4V~+4V, and Frequency modulation range is 0~100KHz；Described multiwavelength laser transmitter unit 2 can be exported to be pressed
According to ITU-T G.692 standard regulation centered on C34 passages, line width less than 10KHz multiple wavelength optical signal, output wavelength lead to
Road number is less than 16；Described the first power equalization unit 3 and the second power equalization unit 10 are same class functional unit, comprising with
The identical port number of multiwavelength laser transmitter unit 2, each passage connects an optics adjustable attenuator, the optics adjustable damping
Device can be the manual adjustable attenuator of mechanical optics, or micro electromechanical (MEMS) optics adjustable attenuator, to any
Adjustable attenuator is planted, its attenuation range should meet 0.7dB~40dB；Described wavelength division multiplexer 4, solution wavelength division multiplexer 9 are same
Class device, the wavelength that described wavelength division multiplexer 4, the solution operation wavelength of wavelength division multiplexer 9 are exported with multiwavelength laser transmitter unit 2
Number it is identical and correspond, and centre wavelength precision be less than positive and negative 0.1nm, insertion loss be less than 4dB, and each channel spacing from
Degree is not less than 30dB；The operation wavelength of described pulse-modulator 5 is 1550 ± 30nm, and working frequency is less than 120MHz, delustring
Than more than 50dB, optical rise time is less than 50ns；The first described amplifier 6 is EDFA amplifiers, input wavelength scope
It is 1529nm~1563nm, input optical power is less than -5~5dBm, and 0~13dBm of power output is adjustable, and noise figure is less than
4.5dB；Described sensor array 7 is included and the wavelength number identical channel-splitting filter 13, wave multiplexer 15 of multiwavelength laser transmitter unit 2
And time-division sensor array 14.Each group of channel-splitting filter 13 is that similar device and transmission peak wavelength are launched with multiwavelength laser with wave multiplexer 15
The wavelength of unit 2 is corresponded, and centre wavelength precision is less than ± 0.2nm, and channel isolation is more than 30dB.Described time-division sensing battle array
Row 14 are the fibre optic interferometer of multiple cascades, can be Michelson formula or Mach-pool Dare formula etc., it is characterised in that
Each the input of time-division sensor array 14 is equipped with fibre optic isolater of the isolation more than 60dB；The second described amplification
Device 8 is fiber Raman amplifier, and its operating wavelength range is 1520~1560nm, and input optical power scope is -40~-10dBm,
Equivalent noise figure is less than -3dB, and typical gains are less than 16dB, and input, output end isolation are all higher than 30dB；Described light
Electric converting unit number of active lanes is identical with the output wavelength number of multiwavelength laser transmitter unit 2, and it has been internally integrated respective number
FET PIN detector and A/D conversion chip, detector transimpedance is not less than 100KV/W, and-three dB bandwidth is less than
50MHz, A/D conversion chip sample rate is not less than 100Msps, and precision is not less than 12bit；Described signal is demodulated and shown
Show that unit 12 includes performing the computer of demodulating algorithm and its display software section, it is characterized in that a certain spy of correspondence can be shown
The overall signal of standing wave time-division sensor array 14 long, can show the signal of specific sensing array element in time-division sensor array 14 again.
The beneficial effects of the present invention are：1st, to employ two sets of power equalization units, i.e. first, second power equal for this programme
Weighing apparatus unit, can not only adjust different wave length laser input signal keep power it is essentially identical, while also dynamic regulation from
The signal power of each wavelength that sensor array is returned keeps basically identical, and the power that input signal is improved to greatest extent is consistent
Property.2nd, the present invention not only used the mode that power amplification combines with preamplifier and be carried out to detecting light and interference signal respectively
Amplify, the power of return signal light has been effectively ensured.Meanwhile, preamplifier employs the distributed air-defense side of raman amplifier
Case, while playing equal multiplication factor, noise can reduce 1.5dB, relatively conventional EDFA magnification schemes, effectively reduce and be
The noise level of system.3rd, the present invention exists " " incidence end of the time-division sensor array in sensor array devises isolation and is more than green end
The fibre optic isolater of 60dB, is prevented from the interchannel that the signal of different time-division sensor arrays is not enough caused due to isolation of system degree
Crosstalk, reduces adverse effect of the interchannel crosstalk to signal analysis.
Claims (9)
1. a kind of fiber-optic hydrophone system based on PGC principles, it is characterised in that be provided with modulation of source unit, multi-wavelength single-frequency and swash
Optical Transmit Unit, the first power equalization unit, wavelength division multiplexer, pulse-modulator, the first amplifier, sensor array, second are put
Big device, solution wavelength division multiplexer, the second power equalization unit, photoelectric conversion unit, signal demodulation and display unit, wherein light source are adjusted
Unit processed is modulated to the continuous optical signal of multi-wavelength single-frequency that multi-wavelength monochromatic laser emissions unit is exported, the signal after modulation
Into the first power equalization unit, the signal of the first power equalization unit output enters the input port of wavelength division multiplexer, wavelength-division
The output port of multiplexer is connected with the input of pulse-modulator, and the output signal of pulse-modulator is by the first amplifier
Sensor array is sent into after enhanced processing, the output signal of sensor array sends into solution wavelength division multiplexer after being processed through the second amplifier
Input, the output end for solving wavelength division multiplexer is connected with the corresponding wavelength input port of the second power equalization unit, the second work(
The output end of rate balanced unit is connected with photoelectric conversion unit, and photoelectric conversion unit is connected with signal demodulation with display unit
Connect.
2. a kind of fiber-optic hydrophone system based on PGC principles according to claim 1, it is characterised in that the sensing battle array
Row include multigroup channel-splitting filter, time-division sensor array and wave multiplexer, every group of time-division sensor array and a monochromatic sources phase for wavelength
Correspondence, the COM port of channel-splitting filter is input port, and transmission port connects each group of input of time-division sensor array, reflection end
The COM port of the next channel-splitting filter of mouth connection, the output port of time-division sensor array connects the transmission end of corresponding wavelength wave multiplexer
Mouthful, the COM port of wave multiplexer connects the reflector port of previous wave multiplexer.
3. a kind of fiber-optic hydrophone system based on PGC principles according to claim 2, it is characterised in that the light source is adjusted
Unit processed can simultaneously export the sinusoidal modulation signal on most 16 tunnels, and the adjustable range of the modulated voltage signal is -4V~+4V,
Frequency modulation range is 0~100KHz.
4. a kind of fiber-optic hydrophone system based on PGC principles according to claim 2, it is characterised in that described many ripples
Laser emission element long output according to ITU-T G.692 standard specify centered on C34 passages, line width is more less than 10KHz
Wavelength channels, output wavelength port number is less than 16.
5. a kind of fiber-optic hydrophone system based on PGC principles according to claim 2, it is characterised in that the first power is equal
Weighing apparatus unit and the second power equalization unit are same class functional unit, comprising with multiwavelength laser transmitter unit identical passage
Number, each passage connects an optics adjustable attenuator, and the optics adjustable attenuator can be that mechanical optics is adjustable manually to decline
Subtract device, or micro electromechanical (MEMS) optics adjustable attenuator, to any one adjustable attenuator, its attenuation range should meet
0.7dB~40dB.
6. a kind of fiber-optic hydrophone system based on PGC principles according to claim 2, it is characterised in that wavelength-division multiplex
Device, solution wavelength division multiplexer are similar device, and described wavelength division multiplexer, solution wavelength division multiplexer operation wavelength are sent out with multiwavelength laser
The wavelength number for penetrating unit output is identical and correspond, and centre wavelength precision is less than positive and negative 0.1nm, and insertion loss is less than
4dB, and each interchannel isolation is not less than 30dB.
7. a kind of fiber-optic hydrophone system based on PGC principles according to claim 2, it is characterised in that the pulse is adjusted
The operation wavelength of device processed is 1550 ± 30nm, and working frequency is less than 120MHz, and extinction ratio is more than 50dB, and optical rise time is small
In 50ns；First amplifier is EDFA amplifiers, and input wavelength scope is 1529nm~1563nm, input optical power less than -5~
5dBm, 0~13dBm of power output is adjustable, and input isolation is that, more than 40dB, noise figure is less than 4.5dB.
8. a kind of fiber-optic hydrophone system based on PGC principles according to claim 2, it is characterised in that the sensing battle array
Row are included and multiwavelength laser transmitter unit wavelength number identical channel-splitting filter, wave multiplexer and time-division sensor array, each component
Ripple device is that similar device and transmission peak wavelength are corresponded with multiwavelength laser transmitter unit wavelength with wave multiplexer, centre wavelength precision
Less than ± 0.2nm, channel isolation is more than 30dB, and time-division sensor array is the fibre optic interferometer of multiple cascades, is mikey
Er Xunshi or Mach-pool Dare formula, a fibre optic isolater is equipped with each group of time-division sensor array input；Second amplifies
Device is fiber Raman amplifier, and its operating wavelength range is 1520~1560nm, and input optical power scope is -40~-10dBm,
Equivalent noise figure is less than -3dB, and typical gains are less than 16dB, and input, output end isolation are all higher than 30dB.
9. a kind of fiber-optic hydrophone system based on PGC principles according to claim 2, it is characterised in that opto-electronic conversion list
First number of active lanes is identical with multiwavelength laser transmitter unit output wavelength number, its FET for being internally integrated respective number
PIN detector and A/D conversion chip, detector transimpedance are not less than 100KV/W, and-three dB bandwidth is less than 50MHz, mould
Plan/digital conversion chip sample rate is not less than 100Msps, and precision is not less than 12bit.
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| CN107230307A (en) * | 2017-07-31 | 2017-10-03 | 威海北洋光电信息技术股份公司 | One kind is based on the full optical fiber interference type perimeter security system of 3 × 3 coupler schemes |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107230307A (en) * | 2017-07-31 | 2017-10-03 | 威海北洋光电信息技术股份公司 | One kind is based on the full optical fiber interference type perimeter security system of 3 × 3 coupler schemes |
| CN107421628A (en) * | 2017-07-31 | 2017-12-01 | 威海北洋光电信息技术股份公司 | A kind of anti-polarization decay interference type optical fiber hydrophone system |
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| CN109708743A (en) * | 2019-02-20 | 2019-05-03 | 湖北工业大学 | A kind of interference formula fibre optic hydrophone detection system |
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| CN111490829A (en) * | 2020-04-08 | 2020-08-04 | 威海北洋电气集团股份有限公司 | Signal dynamic regulation method and system and application thereof in optical fiber sensing |
| CN111490829B (en) * | 2020-04-08 | 2022-09-20 | 威海北洋电气集团股份有限公司 | Signal dynamic regulation method and system and application thereof in optical fiber sensing |
| CN112697256A (en) * | 2020-12-10 | 2021-04-23 | 中国科学院深圳先进技术研究院 | PGC demodulation system based on sound wave modulation and demodulation method thereof |
| CN112697256B (en) * | 2020-12-10 | 2023-06-27 | 中国科学院深圳先进技术研究院 | PGC demodulation system based on acoustic wave modulation and demodulation method thereof |
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