CN105807288A - Laser monitoring device and system of monitoring equipment - Google Patents
Laser monitoring device and system of monitoring equipment Download PDFInfo
- Publication number
- CN105807288A CN105807288A CN201610211292.2A CN201610211292A CN105807288A CN 105807288 A CN105807288 A CN 105807288A CN 201610211292 A CN201610211292 A CN 201610211292A CN 105807288 A CN105807288 A CN 105807288A
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- laser
- eavesdropping
- infrared
- monitoring device
- discharger
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/88—Lidar systems specially adapted for specific applications
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
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- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Optical Communication System (AREA)
Abstract
The invention discloses a laser monitoring device and system of monitoring equipment.The laser monitoring device and system comprise a semiconductor laser transmitter, a laser monitoring eavesdropping transmitting device, a laser beam expanding optical system, a laser transmitting system, a closed box, a sound collection device, a common infrared eavesdropping transmitting device, a laser detector, a noise reduction processing system, an audio output end, an audio modulation amplifier, a pre-amplifier, an infrared receiver, an infrared modulation transmitting system and an amplification noise processer.The laser monitoring device and system have the advantages that the device integrates the advantages of the contact type eavesdropping technology in a short-distance complex environment and the advantages of laser eavesdropping under a long-distance non-contact condition, and the device switches between the two eavesdropping modes freely according to different conditions.The device integrates common infrared and laser infrared as transmission media, thereby the eavesdropping distance can reach one kilometer, the device can be adapted to the contact situation as well as the non-contact situation, high practicability is achieved, the inner structure of the system is stable in connection, and the laser monitoring device and system are suitable for being used for criminal investigation and criminal case cracking equipment.
Description
Technical field
The present invention relates to a kind of laser eavesdropping device, be specifically related to laser monitoring device and the system of a kind of audiomonitor, belong to acousto-optics technical field.
Background technology
The form monitored has multiple, from initial installation specialty audiomonitor, sets up pseudo-base station till now and monitors for wireless phone, experienced by very long process.Nowadays the use of monitoring technique is fairly common, in war, for learning the content that enemy gets in touch with each other, often electric wire is connected on enterprising the committing theft of enemy's communication line and listens, to grasp the initiative of war.In present cracking of cases, Security Officer is placed on, Minisize wireless microphone, the place that suspect often haunts, and monitors their conversation content, grasps conclusive evidence.Monitor requirement quite hidden, be not easily found, so needing to adopt various methods cleverly and technology.Laser technology is adopted to monitor, it is possible to hear heavily guarded, the acoustic information in the room that people cannot be close.Photodetector of a great variety, common are selenium, germanium, silicon, GaAs etc..Can with in a branch of invisible Laser emission to the windowpane in this room, owing to sound can cause the microvibration of windowpane, thus causing the laser spot positions reflected to change.Some current audiomonitors come with some shortcomings to it is frequently necessary to contact when part is monitored and just can carry out monitoring work, and the use scope of monitoring is less, inefficiency.
Summary of the invention
The purpose of the present invention is that the laser monitoring device and system that provide a kind of audiomonitor in order to solve the problems referred to above.
The present invention is achieved through the following technical solutions laser monitoring device and the system of a kind of audiomonitor of above-mentioned purpose, including semiconductor laser transmitter, laser eavesdropping discharger, laser beam expanding optical system, transmitting laser system, airtight box, adopts acoustic device, common infrared eavesdropping discharger, laser detector, noise reduction process system, audio output, voice modulation amplifier, preamplifier, infrared remote receiver, infrared modulated transmission system and amplifies noise processor；nullDescribed laser eavesdropping discharger is internally provided with semiconductor laser transmitter、Laser beam expanding optical system and transmitting laser system，Described laser eavesdropping discharger is connected by optical signal with airtight box，Described airtight box is connected with adopting acoustic device，The described amplification noise processor adopting acoustic device and be arranged within common infrared eavesdropping discharger is connected，Described amplification noise processor sends system with infrared modulated and is connected，Described common infrared eavesdropping discharger is connected with infrared remote receiver，Described infrared remote receiver is connected with preamplifier signal，Described preamplifier is connected with laser detector，And described laser detector is connected with described airtight box optical signal，Described preamplifier is connected with voice modulation amplifier，Described voice modulation amplifier is connected with audio output，It is connected to noise reduction process system between described voice modulation amplifier and described audio output.
Preferably, described semiconductor laser transmitter and described laser beam expanding optical system connect, and described laser beam expanding optical system and transmitting laser system connect.
Preferably, described audio output, described voice modulation amplifier, described preamplifier and described infrared remote receiver constitute reception device.
Preferably, described infrared modulated transmission system is positioned at the inside of described common infrared wiretap.
Preferably, described transmitting laser system sends continuous print 5mW near infrared light, and wave-length coverage is approximately in 790-820nm.
Preferably, described laser detector investigative range is between 400-1100nm.
The invention has the beneficial effects as follows: this equipment complex contact Eavesdropping short distance compared with the advantage under complex environment and laser eavesdropping the advantage under remote noncontact condition, freely switch between two kinds of eavesdropping modes according to different condition.This equipment complex adopt common infrared with laser infrared as transmission medium, so that eavesdropping distance reaches 1 kilometer, and adapt to contact and two kinds of situations of noncontact, and there is very strong practicality, it is of a specified duration that this equipment has service life, simple to operate, monitoring effective, disposable charging can use for a long time, has the function of store voice information recording, it is suitable for investigation and use of solving a case, uses scope wider.Selecting silicon photodetector, its advantage: stable performance, spectral region width in this device, frequency characteristic is good, and conversion efficiency is high, resistant to hyperthermia radiation etc..
Accompanying drawing explanation
Fig. 1 is the construction module figure of the present invention；
Fig. 2 is the operation principle module map of the present invention；
In figure: 1, semiconductor laser transmitter；2, laser eavesdropping discharger；3, laser beam expanding optical system；4, laser system is launched；5, airtight box；6, acoustic device is adopted；7, common infrared eavesdropping discharger；8, laser detector；9, noise reduction process system；10, audio output；11, voice modulation amplifier；12, preamplifier；13, infrared remote receiver；14, infrared modulated sends system；15, noise processor is amplified.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention.
Refer to Fig. 1-2, the laser monitoring device of a kind of audiomonitor and system, including semiconductor laser transmitter 1, laser eavesdropping discharger 2, laser beam expanding optical system 3, transmitting laser system 4, airtight box 5, adopt acoustic device 6, common infrared eavesdropping discharger 7, laser detector 8, noise reduction process system 9, audio output 10, voice modulation amplifier 11, preamplifier 12, infrared remote receiver 13, infrared modulated transmission system 14 and amplify noise processor 15；nullDescribed laser eavesdropping discharger 2 is internally provided with semiconductor laser transmitter 1、Laser beam expanding optical system 3 and transmitting laser system 4，Described laser eavesdropping discharger 2 is connected by optical signal with airtight box 5，Described airtight box 5 is connected with adopting acoustic device 6，The described amplification noise processor 15 adopting acoustic device 6 and be arranged within common infrared eavesdropping discharger 7 is connected，Described amplification noise processor 15 sends system 14 with infrared modulated and is connected，Described common infrared eavesdropping discharger 7 is connected with infrared remote receiver 13，Described infrared remote receiver 13 is connected with preamplifier 12 signal，Described preamplifier 12 is connected with laser detector 8，And described laser detector 8 is connected with described airtight box 5 optical signal，Described preamplifier 12 is connected with voice modulation amplifier 11，Described voice modulation amplifier 11 is connected with audio output 10，It is connected to noise reduction process system 9 between described voice modulation amplifier 11 and described audio output 10.
A kind of technical optimization scheme as the present invention: described semiconductor laser transmitter 1 and described laser beam expanding optical system 3 connect, described laser beam expanding optical system 3 and transmitting laser system 4 connect, described semiconductor laser transmitter can directly send a signal to laser beam expanding optical system, and work efficiency is high.
A kind of technical optimization scheme as the present invention: described audio output 10, described voice modulation amplifier 11, described preamplifier 12 and described infrared remote receiver 13 constitute reception device, it is possible to make the range of signal that reception device receives wide.
A kind of technical optimization scheme as the present invention: described infrared modulated sends system 14 and is positioned at the inside of described common infrared wiretap 7, and infrared modulated sends system and directly infrared ray can be modulated and send.
A kind of technical optimization scheme as the present invention: described transmitting laser system 4 sends continuous print 5mW near infrared light, and wave-length coverage is approximately in 790-820nm.The power of 5mW is enough in laser eavesdropping, and working range can reach lkm.
A kind of technical optimization scheme as the present invention: described laser detector 8 investigative range is between 400-1100nm.The wavelength of near infrared light just meets the requirement of the peak response wavelength of silicon photoelectric diode, makes pick-up probe be operated in bigger responsiveness.Infrared light is black light, it is not easy to monitored object is discovered；Infrared light has good characteristics of atmospheric transmission, almost can be left out atmospheric scattering；This laser instrument is easy to carry, it is easy to carry out practical operation；For the infrared light of bigger wavelength, near-infrared is susceptible to the influence of noise that heat radiation brings；The reception sensor of near infrared light, it is not necessary to special cooling device, it is possible to work in optimum sensitivity.
In use, this device utilizes laser and the feature of infrared directivity and monochromaticity to the present invention, adopts laser monitoring system.During system work, laser generator produces a branch of superfine laser, and be transmitted to be ravesdropping on the glass in room, when there being people to talk in room, glass is because being subject to the impact of indoor sound variation and slight vibration occurring, and produce acoustic pressure at glass surface, the size of acoustic pressure is relevant with location with particle, and only reacting and acting directly on local acoustical above of glass surface is pressed into direct ratio, therefore glass can be deformed so that laser angle of incidence when incident direction is constant is changed.Can learn that the luminous power of reflection light also changes therewith by the reflection law of light, the law of refraction and fresnel formula.People, on outdoor certain position, receive with laser pickoff, and after filtering and amplify, can be achieved with the function that people in monitor room speaks.Voice can directly be saved as digital document by this equipment, it is possible to exported by 3.5 audio interface.
This device is broadly divided into discharger, signal processing apparatus, reception device and speech data storage device, and owing to laser eavesdropping is identical with common infrared eavesdropping record principle, simply detecting head is different, and therefore receiving device can share.The discharger of laser eavesdropping part is made up of semiconductor laser transmitter and optical system.The discharger of common infrared eavesdropping part is amplified by sound collection, and infrared modulated sends system and constitutes.Sound is when sending, sound source can produce vibration on glass, the reflection that can cause light changes, after RF transmitter launches laser, laser can bump against on glass, glass can produce trickle change, light can be become the inside being delivered to condenser by laser, the projection that light changes can be gathered the surface of optical-electrical converter by condenser, optical-electrical converter can convert optical signals to weak electric signal, it is amplified through band amplifier, band signal after amplification becomes acoustical signal, acoustical signal can be delivered to denoiser, denoiser can carry out noise reduction process, acoustical signal after noise reduction process can play back either directly through speaker, acoustical signal after amplifying can be become digital signal file storage by the memorizer of this device interior, file after storage finally can be processed by computer.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, and when without departing substantially from the spirit of the present invention or basic feature, it is possible to realize the present invention in other specific forms.Therefore, no matter from which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the invention rather than described above limits, it is intended that all changes in the implication of the equivalency dropping on claim and scope included in the present invention.Any accompanying drawing labelling in claim should be considered as the claim that restriction is involved.
In addition, it is to be understood that, although this specification is been described by according to embodiment, but not each embodiment only comprises an independent technical scheme, this narrating mode of description is only for clarity sake, description should be made as a whole by those skilled in the art, and the technical scheme in each embodiment through appropriately combined, can also form other embodiments that it will be appreciated by those skilled in the art that.
Claims (6)
1. the laser monitoring device of an audiomonitor and system, including semiconductor laser transmitter (1), laser eavesdropping discharger (2), laser beam expanding optical system (3), launch laser system (4), airtight box (5), adopt acoustic device (6), common infrared eavesdropping discharger (7), laser detector (8), noise reduction process system (9), audio output (10), voice modulation amplifier (11), preamplifier (12), infrared remote receiver (13), infrared modulated sends system (14) and amplifies noise processor (15)；nullIt is characterized in that: described laser eavesdropping discharger (2) is internally provided with semiconductor laser transmitter (1)、Laser beam expanding optical system (3) and transmitting laser system (4)，Described laser eavesdropping discharger (2) is connected by optical signal with airtight box (5)，Described airtight box (5) is connected with adopting acoustic device (6)，Described adopt acoustic device (6) and be connected with the amplification noise processor (15) that to be arranged at common infrared eavesdropping discharger (7) internal，Described amplification noise processor (15) sends system (14) with infrared modulated and is connected，Described common infrared eavesdropping discharger (7) is connected with infrared remote receiver (13)，Described infrared remote receiver (13) is connected with preamplifier (12) signal，Described preamplifier (12) is connected with laser detector (8)，And described laser detector (8) is connected with described airtight box (5) optical signal，Described preamplifier (12) is connected with voice modulation amplifier (11)，Described voice modulation amplifier (11) is connected with audio output (10)，Noise reduction process system (9) it is connected between described voice modulation amplifier (11) and described audio output (10).
2. the laser monitoring device of a kind of audiomonitor according to claim 1 and system, it is characterized in that: described semiconductor laser transmitter (1) and described laser beam expanding optical system (3) connect, described laser beam expanding optical system (3) and transmitting laser system (4) connect.
3. the laser monitoring device of a kind of audiomonitor according to claim 1 and system, it is characterised in that: described audio output (10), described voice modulation amplifier (11), described preamplifier (12) and described infrared remote receiver (13) constitute reception device.
4. the laser monitoring device of a kind of audiomonitor according to claim 1 and system, it is characterised in that: described infrared modulated sends system (14) and is positioned at the inside of described common infrared wiretap (7).
5. the laser monitoring device of a kind of audiomonitor according to claim 1 and system, it is characterised in that: described transmitting laser system (4) sends continuous print 5mW near infrared light, and wave-length coverage is approximately in 790-820nm.
6. the laser monitoring device of a kind of audiomonitor according to claim 1 and system, it is characterised in that: described laser detector (8) investigative range is between 400-1100nm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610211292.2A CN105807288B (en) | 2016-04-06 | 2016-04-06 | A kind of the laser monitoring device and system of audiomonitor |
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| CN201610211292.2A CN105807288B (en) | 2016-04-06 | 2016-04-06 | A kind of the laser monitoring device and system of audiomonitor |
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| CN105807288A true CN105807288A (en) | 2016-07-27 |
| CN105807288B CN105807288B (en) | 2019-01-04 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108471332A (en) * | 2018-03-17 | 2018-08-31 | 广东容祺智能科技有限公司 | A kind of remote monitoring system |
| CN108847091A (en) * | 2018-04-24 | 2018-11-20 | 山东大学 | A kind of instrument and meter and automated integrated experimental device |
| CN113219482A (en) * | 2021-04-08 | 2021-08-06 | 三明学院 | Laser monitoring device and monitoring method capable of improving energy utilization rate |
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| CN101568051A (en) * | 2009-06-08 | 2009-10-28 | 北京建筑工程学院 | Method and device for restoring acoustical signal by using laser |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108471332A (en) * | 2018-03-17 | 2018-08-31 | 广东容祺智能科技有限公司 | A kind of remote monitoring system |
| CN108847091A (en) * | 2018-04-24 | 2018-11-20 | 山东大学 | A kind of instrument and meter and automated integrated experimental device |
| CN108847091B (en) * | 2018-04-24 | 2020-08-28 | 山东大学 | Instrument and meter and automatic comprehensive experiment device |
| CN113219482A (en) * | 2021-04-08 | 2021-08-06 | 三明学院 | Laser monitoring device and monitoring method capable of improving energy utilization rate |
| CN113219482B (en) * | 2021-04-08 | 2024-05-03 | 三明学院 | Laser monitoring device capable of improving energy utilization rate and monitoring method |
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| CN105807288B (en) | 2019-01-04 |
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