CN106100725A - A kind of reverse modulation wireless light communication device and method based on laser speckle detection - Google Patents
A kind of reverse modulation wireless light communication device and method based on laser speckle detection Download PDFInfo
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- CN106100725A CN106100725A CN201610361314.3A CN201610361314A CN106100725A CN 106100725 A CN106100725 A CN 106100725A CN 201610361314 A CN201610361314 A CN 201610361314A CN 106100725 A CN106100725 A CN 106100725A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
- H04B10/112—Line-of-sight transmission over an extended range
- H04B10/1123—Bidirectional transmission
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Abstract
The invention discloses a kind of reverse modulation wireless light communication device and method based on laser speckle detection, this device transmitting terminal condenser lens, piezoelectric ceramics, driver, receiving terminal includes laser instrument, optical alignment antenna, half-reflecting half mirror, optics telephoto lens, high speed camera, video signal collecting card, image signal processing blocks.Laser instrument sends laser beam, through half-reflecting half mirror after optical alignment antenna collimates, is focused after lens converge and is incident to piezoelectric ceramics formation laser speckle pattern；Driver produces vibration according to input signal modulation piezoelectric ceramics, makes laser specklegram case generation respective change；The light beam of piezoelectric ceramics reflection is along the retroeflection of former road to receiving terminal, optics telephoto lens is reflexed to by half-reflecting half mirror, laser speckle pattern is made to defocus virtualization by changing focal length, and by high speed camera collect laser speckle image export to image signal processing blocks, according to the size recovering signal of gray value.Low light signals can be detected by the present invention, simple in construction, easy and simple to handle.
Description
Technical field
The invention belongs to wireless light communication technical field, a kind of reverse modulation based on laser speckle detection is wireless
Optical communication apparatus and method.
Background technology
Grew up in recent years inversely modulates wireless light communication, utilizes " opal " effect can deduct conventional wireless light and leads to
The transmitter of one terminal of communication system and pointing system, reduce the technical sophistication of radio optical communication system to a certain extent
Degree, causes the extensive concern of research worker.The transmitting terminal of reverse modulation free-space optical communication system configures a band " cat
Eye " the reverse manipulator (Modulating Retro-Reflector, MRR) of optical system.In this system, receiving terminal is first
First send the laser beam through collimation and constitute the reverse manipulator of " opal " optics to transmitting terminal, condenser lens and piezoelectric ceramics,
Driver modulation piezoelectric ceramics so that incident light beam returns along former direction after being modulated.The reverse modulation technique of Application Optics
Optical communication system use reverse modulated signal to communicate, remove the pointing system of one of them terminal from, alleviate wherein one
The volume and weight of individual terminal, adds the motility of communication system applications.
Reverse modulation radio optical communication system solves the needs that conventional wireless optical communication system exists to a certain extent
The problems such as automatic pointing, therefore this technology is quite paid attention to and has carried out substantial amounts of research by various countries.External to inversely modulating skill
The research of art is compared to domestic starting relatively early.US Naval Research Laboratory (NRL) started just to carry out its Tactical Application from 1998
Research, and be applied to explosive ordnance and process (EOD), unmanned plane (UAVs) and unmanned battlebus (UGVs) three fields.This
Outward, the country such as Britain, Sweden the most all carries out correlational study.But generally there is reception in the most reverse modulation wireless light communication
The weak problem being difficult to detect of optical signal.To this end, need to design the optical antenna of larger caliber when receiving, and use high sensitivity
Photodetector (such as AMD avalanche multiplication photodiode and PMT photomultiplier tube), make the most again system become more sophisticated,
Volume and weight is bigger.
Summary of the invention
It is an object of the invention to provide a kind of be capable of low light signals detection based on laser speckle detection reverse
Modulation wireless light communication device and method.
The technical solution realizing the object of the invention is: a kind of reverse modulation wireless optical based on laser speckle detection is led to
T unit, including transmitting terminal and receiving terminal, wherein transmitting terminal includes condenser lens, piezoelectric ceramics, driver, and receiving terminal includes swashing
At light device, optical alignment antenna, half-reflecting half mirror, optics telephoto lens, high speed camera, video signal collecting card, picture signal
Reason module；Described laser instrument, optical alignment antenna, half-reflecting half mirror, condenser lens, piezoelectric ceramics common optical axis successively are arranged, and drive
The outfan of dynamic device accesses piezoelectric ceramics；Optics telephoto lens and the supporting setting of high speed camera, and the outfan of high speed camera is logical
Cross video signal collecting card incoming image signal processing module；
The laser instrument of receiving terminal sends laser beam, collimates through optical alignment antenna, and the light beam after collimation is anti-through half
Transmitting in atmospheric channel after pellicle mirror, the light beam arriving transmitting terminal through atmospheric channel transmission is focused after lens converge incident
To piezoelectric ceramics, light beam forms laser speckle pattern on the surface of piezoelectric ceramics；Driver is believed according to voice or the data of input
Number modulation piezoelectric ceramics produce vibration, make the laser specklegram case generation respective change that piezoelectric ceramics surface is formed；Piezoelectric ceramics
The light beam of reflection is by the former road retroeflection of condenser lens tailing edge to receiving terminal, and the information that laser speckle pattern carries also is returned to connect
Receiving end；Retroeflection is reflexed to optics telephoto lens to the light beam of receiving terminal by half-reflecting half mirror, and optics telephoto lens is by changing Jiao
Defocus virtualization away from the laser speckle pattern making retroeflection, defocus the laser speckle pattern after virtualization and collected laser by high speed camera
Speckle image, this laser speckle image is processed by video signal collecting card output to image signal processing blocks, picture signal
Module detects a part or whole part gray value of each frame laser speckle image, according to the voice of the size also original sender of gray value
Or data signal.
Preferably, described piezoelectric ceramics is not positioned at the focal position of condenser lens.
Preferably, the frame frequency of described high speed camera by transmission voice or data signal bandwidth twice more than.
A kind of reverse modulation wireless light communication method based on laser speckle detection, step is as follows:
Step 1, the laser instrument of receiving terminal sends laser beam, collimates through optical alignment antenna, and the light beam after collimation is worn
Transmit in atmospheric channel after crossing half-reflecting half mirror；
Step 2, the light beam through atmospheric channel transmission arrival transmitting terminal is focused after lens converge and is incident to piezoelectric ceramics,
Light beam forms laser speckle pattern on the surface of piezoelectric ceramics；Driver is made pottery according to voice or the data signal modulation piezoelectricity of input
Porcelain produces vibration, makes the laser specklegram case generation respective change that piezoelectric ceramics surface is formed；
Step 3, the light beam of piezoelectric ceramics reflection passes through the former road retroeflection of condenser lens tailing edge to receiving terminal, laser speckle pattern
The information carrying signal to be sent is also returned to receiving terminal；
Step 4, the light beam of retroeflection to receiving terminal is reflexed to optics telephoto lens by half-reflecting half mirror, and optics telephoto lens is led to
Crossing change focal length makes the laser speckle pattern of retroeflection defocus virtualization, defocuses the laser speckle pattern after virtualization and is gathered by high speed camera
Obtain laser speckle image；
Step 5, the laser speckle image that high speed camera gathers is processed to picture signal by video signal collecting card output
Module, image signal processing blocks detects a part or whole part gray value of each frame laser speckle image, big according to gray value
Little reduction output voice or data signal.
Further, driver described in step 2 produces vibration according to voice or the data signal modulation piezoelectric ceramics of input,
Particularly as follows: the method using intensity modulated, change the amplitude of piezoelectric ceramic vibration according to the size of input signal, thus realize letter
Number modulation.
Further, image signal processing blocks described in step 5 detects a part or whole part of each frame laser speckle image
Gray value, reduces according to the size of gray value and exports voice or data signal, particularly as follows: at receiving terminal, select laser specklegram
The subregion of picture or Zone Full, by the gray value superposition of each pixel, the ash that after superposition, gained is total in selected areas
Angle value changes along with the vibration of transmitting terminal piezoelectric ceramics, according to size reduction voice or the data signal of gray value, completes to solve
Adjust and realize communication.
Compared with prior art, its remarkable advantage is the present invention: (1) is come extensive with the gray value detecting laser speckle pattern
Multiple primary signal, the change in optical signal that its energy perception is faint, it is achieved low light signals detects；(2) reduce the complexity of system, subtract
The little volume and weight of communication equipment.
Accompanying drawing explanation
Fig. 1 is the reverse structural representation modulating wireless light communication device that the present invention detects based on laser speckle.
Fig. 2 is the speckle pattern before and after piezoelectric ceramic vibration, the speckle pattern before wherein (a) is piezoelectric ceramic vibration, and (b) is pressure
Speckle pattern after electroceramics vibration.
Fig. 3 is the partial enlarged drawing of laser specklegram.
Fig. 4 is the primary signal figure that image signal processing blocks is reduced according to laser speckle image gray value.
Detailed description of the invention
Reverse modulation wireless light communication method based on laser speckle detection disclosed by the invention is by laser speckle measurement skill
Art is applied to inversely modulate radio optical communication system, and the method for available detection laser speckle realizes low light signals detection, thus
Realize inversely modulating wireless light communication.
In conjunction with Fig. 1, the reverse modulation wireless light communication device that the present invention detects based on laser speckle, including transmitting terminal with connect
Receiving end, wherein transmitting terminal includes condenser lens 1, piezoelectric ceramics 2, driver 3, and receiving terminal includes laser instrument 4, optical alignment antenna
5, half-reflecting half mirror 6, optics telephoto lens 7, high speed camera 8, video signal collecting card 9, image signal processing blocks 10；Described
Laser instrument 4, optical alignment antenna 5, half-reflecting half mirror 6, condenser lens 1, piezoelectric ceramics 2 common optical axis successively are arranged, driver 3
Outfan accesses piezoelectric ceramics 2；Optics telephoto lens 7 and the supporting setting of high speed camera 8, and the outfan of high speed camera 8 passes through
Video signal collecting card 9 incoming image signal processing module 10；
Work process is: the laser instrument 4 of receiving terminal sends laser beam, collimates through optical alignment antenna 5, after collimation
Light beam transmits after half-reflecting half mirror 6 in atmospheric channel, and the light beam arriving transmitting terminal through atmospheric channel transmission is focused
Lens 1 are incident to piezoelectric ceramics 2 after converging, and light beam forms laser speckle pattern on the surface of piezoelectric ceramics 2；Driver 3 basis
The voice of input or data signal modulation piezoelectric ceramics 2 produce vibration, make the laser specklegram crime that piezoelectric ceramics 2 surface is formed
Raw respective change；The light beam of piezoelectric ceramics 2 reflection passes through condenser lens 1 tailing edge former road retroeflection to receiving terminal, laser speckle pattern
The information carried also is returned to receiving terminal；Retroeflection is reflexed to optics telephoto lens to the light beam of receiving terminal by half-reflecting half mirror 6
7, optics telephoto lens 7 makes the laser speckle pattern of retroeflection defocus virtualization by changing focal length, defocuses the laser speckle after virtualization
Pattern is collected laser speckle image by high speed camera 8, and this laser speckle image is by video signal collecting card 9 output extremely figure
Image signal processing module 10, image signal processing blocks 10 detects a part or whole part gray value of each frame laser speckle image,
The voice of the also original sender of the size according to gray value or data signal.
Preferably, described piezoelectric ceramics 2 is not positioned at the focal position of condenser lens 1.
Preferably, the frame frequency of described high speed camera 8 by transmission voice or data signal bandwidth twice more than.
The reverse modulation wireless light communication method that the present invention detects based on laser speckle, step is as follows:
Step 1, the laser instrument 4 of receiving terminal sends laser beam, collimates through optical alignment antenna 5, the light beam after collimation
Transmit in atmospheric channel after half-reflecting half mirror 6.
Step 2, the light beam through atmospheric channel transmission arrival transmitting terminal is focused after lens 1 converge and is incident to piezoelectric ceramics
2, light beam forms laser speckle pattern on the surface of piezoelectric ceramics 2；Driver 3 is according to the voice inputted or data signal modulation pressure
Electroceramics 2 produces vibration, makes the laser specklegram case generation respective change that piezoelectric ceramics 2 surface is formed；
Described driver 3 produces vibration according to voice or the data signal modulation piezoelectric ceramics 2 of input, particularly as follows: use
The method of intensity modulated, changes the amplitude of piezoelectric ceramics 2 vibration, thus realizes the modulation of signal according to the size of input signal.
Step 3, the light beam of piezoelectric ceramics 2 reflection passes through condenser lens 1 tailing edge former road retroeflection to receiving terminal, laser specklegram
Case carries the information of signal to be sent and is also returned to receiving terminal.
Step 4, the light beam of retroeflection to receiving terminal is reflexed to optics telephoto lens 7, optics telephoto lens by half-reflecting half mirror 6
7 make the laser speckle pattern of retroeflection defocus virtualization by changing focal length, defocus the laser speckle pattern after virtualization by high speed camera 8
Collect laser speckle image.
Step 5, the laser speckle image that high speed camera 8 gathers is exported to picture signal by video signal collecting card 9
Reason module 10, image signal processing blocks 10 detects a part or whole part gray value of each frame laser speckle image, according to gray scale
The size reduction output voice or data signal of value, particularly as follows: at receiving terminal, select laser speckle image subregion or
Zone Full, by the gray value superposition of each pixel in selected areas, the gray value that after superposition, gained is total is along with sending side pressure
The vibration of electroceramics 2 and change, reduce voice or data signal according to the size of gray value, complete demodulation and realize communication.
Embodiment 1
Below in conjunction with the accompanying drawings and the present invention is inversely modulated wireless light communication based on what laser speckle detected by specific embodiment
Device and method carries out as described below, is embodied as step as follows:
The first step: communication is initiated by receiving terminal, and the laser instrument 4 of receiving terminal sends laser beam, through optical alignment antenna 5
Collimation, the light beam after collimation has the less angle of divergence, is then passed through half-reflecting half mirror 6 and transmits in atmospheric channel, so, warp
The concentration of light energy can be kept well after long-distance transmission.
Second step: at transmitting terminal, the light beam arriving transmitting terminal through propagation in atmosphere is focused directive out of focus after lens 1 converge
Piezoelectric ceramics 2.In order to form laser speckle on the surface of piezoelectric ceramics, out of focus piezoelectric ceramics 2 can not be placed on focal point, it is necessary to
It is positioned at position at non-focus (not the most being easily formed laser speckle).Compared with optical wavelength, the surface of piezoelectric ceramics is rougher, because of
This laser beam can form laser speckle on the surface of out of focus piezoelectric ceramics 2.Driver 3 is according to the size modulations of signal to be transmitted
Piezoelectric ceramics 2, piezoelectric ceramics 2 produces vibration along with the change of input signal strength, so that out of focus piezoelectric ceramics 2 surface
The laser specklegram case generation respective change formed, as in figure 2 it is shown, the signal now loaded is the sine wave of 180Hz, this mistake
Journey namely achieve transmission signal modulation.When reflected light beam passes through condenser lens 1 tailing edge backtracking to receiving terminal,
Laser speckle pattern carries the information of signal to be sent and is also returned to receiving terminal.Before wherein Fig. 2 (a) is piezoelectric ceramic vibration
Speckle pattern, Fig. 2 (b) is the speckle image after piezoelectric ceramic vibration.
3rd step: the laser beam of retroeflection to receiving terminal is reflexed to optics telephoto lens 7, light schoolmate by half-reflecting half mirror 6
Zoom lens 7, by changing its focal length, makes the laser speckle of retroeflection defocus virtualization, and then this speckle pattern is by high speed camera 8 He
Video signal collecting card 9 imaging output digital video signal.In order to preferably recover signal, need high-speed sampling.Now,
The frame frequency of high speed camera 8 is that 500 frames are per second, then selects the speckle regions that brightness is higher, or selects whole laser specklegram,
Image signal processing blocks 10 is by the gray value superposition of each pixel in selected areas.After superposition, total gray value will be with
The vibration of transmitting terminal piezoelectric ceramics 2 and change.Fig. 3 is the image after the laser specklegram partial enlargement that experiment is selected, Fig. 4 institute
The 180Hz sine wave signal of output is demodulated after being shown as the gray value superposition of all pixels of selected areas.Therefore transmission can be reduced
The signal that end sends, completes demodulation with this, it is achieved communication.
Claims (6)
1. a reverse modulation wireless light communication device based on laser speckle detection, it is characterised in that include transmitting terminal and connect
Receiving end, wherein transmitting terminal includes condenser lens (1), piezoelectric ceramics (2), driver (3), and receiving terminal includes laser instrument (4), optics
Collimation antenna (5), half-reflecting half mirror (6), optics telephoto lens (7), high speed camera (8), video signal collecting card (9), image
Signal processing module (10)；Described laser instrument (4), optical alignment antenna (5), half-reflecting half mirror (6), condenser lens (1), piezoelectricity
Pottery (2) common optical axis successively is arranged, and the outfan of driver (3) accesses piezoelectric ceramics (2)；Optics telephoto lens (7) and high speed
Camera (8) supporting setting, and the outfan of high speed camera (8) is by video signal collecting card (9) incoming image signal process mould
Block (10)；
The laser instrument (4) of receiving terminal sends laser beam, collimates through optical alignment antenna (5), and the light beam after collimation is through half
Transmitting in atmospheric channel after anti-pellicle mirror (6), the light beam arriving transmitting terminal through atmospheric channel transmission is focused lens (1) remittance
Being incident to piezoelectric ceramics (2) after Ju, light beam forms laser speckle pattern on the surface of piezoelectric ceramics (2)；Driver (3) is according to defeated
The voice entered or data signal modulation piezoelectric ceramics (2) produce vibration, make the laser speckle pattern that piezoelectric ceramics (2) surface is formed
There is respective change；The light beam that piezoelectric ceramics (2) reflects is dissipated by condenser lens (1) tailing edge former road retroeflection to receiving terminal, laser
The information that speckle pattern carries also is returned to receiving terminal；Retroeflection is reflexed to optics to the light beam of receiving terminal by half-reflecting half mirror (6)
Telephoto lens (7), optics telephoto lens (7) makes the laser speckle pattern of retroeflection defocus virtualization by changing focal length, defocuses virtualization
After laser speckle pattern collected laser speckle image by high speed camera (8), this laser speckle image passes through video signal
Capture card (9) exports to image signal processing blocks (10), and image signal processing blocks (10) detects each frame laser specklegram
A part or whole part gray value of picture, according to voice or the data signal of the size also original sender of gray value.
Reverse modulation wireless light communication device based on laser speckle detection the most according to claim 1, it is characterised in that
Described piezoelectric ceramics (2) is not positioned at the focal position of condenser lens (1).
Reverse modulation wireless light communication device based on laser speckle detection the most according to claim 1, it is characterised in that
The frame frequency of described high speed camera (8) by transmission voice or data signal bandwidth twice more than.
4. a reverse modulation wireless light communication method based on laser speckle detection, it is characterised in that step is as follows:
Step 1, the laser instrument (4) of receiving terminal sends laser beam, collimates through optical alignment antenna (5), the light beam after collimation
Transmit in atmospheric channel after half-reflecting half mirror (6)；
Step 2, the light beam through atmospheric channel transmission arrival transmitting terminal is focused after lens (1) converge and is incident to piezoelectric ceramics
(2), light beam forms laser speckle pattern on the surface of piezoelectric ceramics (2)；Driver (3) is according to the voice inputted or data signal
Modulation piezoelectric ceramics (2) produces vibration, makes the laser specklegram case generation respective change that piezoelectric ceramics (2) surface is formed；
Step 3, the light beam that piezoelectric ceramics (2) reflects passes through the former road retroeflection of condenser lens (1) tailing edge to receiving terminal, laser specklegram
Case carries the information of signal to be sent and is also returned to receiving terminal；
Step 4, the light beam of retroeflection to receiving terminal is reflexed to optics telephoto lens (7), optics telephoto lens by half-reflecting half mirror (6)
(7) make the laser speckle pattern of retroeflection defocus virtualization by change focal length, defocus the laser speckle pattern after virtualization by high speed phase
Machine (8) collects laser speckle image；
Step 5, the laser speckle image that high speed camera (8) gathers is exported to picture signal by video signal collecting card (9)
Reason module (10), image signal processing blocks (10) detects a part or whole part gray value of each frame laser speckle image, according to
The size reduction output voice of gray value or data signal.
Reverse modulation wireless light communication method based on laser speckle detection the most according to claim 4, it is characterised in that
Driver described in step 2 (3) produces vibration according to voice or the data signal modulation piezoelectric ceramics (2) of input, particularly as follows: use
The method of intensity modulated, changes, according to the size of input signal, the amplitude that piezoelectric ceramics (2) vibrates, thus realizes the tune of signal
System.
Reverse modulation wireless light communication method based on laser speckle detection the most according to claim 4, it is characterised in that
Image signal processing blocks described in step 5 (10) detects a part or whole part gray value of each frame laser speckle image, according to ash
The size reduction output voice or data signal of angle value, particularly as follows: at receiving terminal, select laser speckle image subregion or
Person's Zone Full, by the gray value superposition of each pixel in selected areas, the gray value that after superposition, gained is total is along with transmitting terminal
The vibration of piezoelectric ceramics (2) and change, reduce voice or data signal according to the size of gray value, complete demodulation and realize communication.
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| CN107703498A (en) * | 2017-11-22 | 2018-02-16 | 中国计量大学 | A kind of miniature laser radar |
| CN109217924A (en) * | 2018-08-03 | 2019-01-15 | 中国人民解放军陆军工程大学 | Two-dimensional signal modulation and demodulation device and method for inverse modulation space optical communication |
| CN109600166A (en) * | 2018-12-10 | 2019-04-09 | 西安理工大学 | Two-way Li-Fi system terminal optical optimization structure and optimization method |
| CN110224752A (en) * | 2018-03-01 | 2019-09-10 | 长春理工大学 | A kind of space optical communication network device based on region segmentation |
| CN110289904A (en) * | 2019-05-24 | 2019-09-27 | 中国人民解放军陆军工程大学 | Turbulent flow restraining method and device for precompensating transmitting optical power in reverse modulation optical communication |
| CN112363039A (en) * | 2020-10-29 | 2021-02-12 | 华南理工大学 | Weak light detection system of organic photoelectric device and control method |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107703498A (en) * | 2017-11-22 | 2018-02-16 | 中国计量大学 | A kind of miniature laser radar |
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| CN110289904A (en) * | 2019-05-24 | 2019-09-27 | 中国人民解放军陆军工程大学 | Turbulent flow restraining method and device for precompensating transmitting optical power in reverse modulation optical communication |
| CN110289904B (en) * | 2019-05-24 | 2022-05-27 | 中国人民解放军陆军工程大学 | Turbulent flow restraining method and device for precompensating transmitting optical power in reverse modulation optical communication |
| CN112363039A (en) * | 2020-10-29 | 2021-02-12 | 华南理工大学 | Weak light detection system of organic photoelectric device and control method |
| CN112363039B (en) * | 2020-10-29 | 2022-04-22 | 华南理工大学 | Weak light detection system of organic photoelectric device and control method |
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| Publication number | Publication date |
|---|---|
| CN106100725B (en) | 2017-12-08 |
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