Utility model content
The purpose of this utility model is that the laser monitoring device providing a kind of audiomonitor in order to solve the problems referred to above.
This utility model is achieved through the following technical solutions the laser monitoring device 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 between described voice modulation amplifier and described audio output and has noise reduction process system.
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 about at 790-820nm.
Preferably, described laser detector investigative range is between 400-1100nm.
The beneficial effects of the utility model are: this equipment complex contact Eavesdropping advantage under short distance is compared with complex environment and laser eavesdropping advantage under remote noncontact condition, freely switch between two kinds of eavesdropping modes according to different condition.This equipment complex employing is the most infrared and laser infrared is as transmission medium, so that eavesdropping distance reaches 1 kilometer, and adapt to contact and two kinds of situations of noncontact, and there is the strongest practicality, it is long 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, being suitable for investigation and use of solving a case, range is wider.Selecting silicon photodetector, its advantage: stable performance, spectral region width in this device, frequency characteristic is good, and conversion efficiency is high, is resistant to hyperthermia radiation etc..
Detailed description of the invention
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is clearly and completely described, it is clear that described embodiment is only a part of embodiment of this utility model rather than whole embodiments.Based on the embodiment in this utility model, the every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise, broadly fall into the scope of this utility model protection.
Refer to Fig. 1-2, the laser monitoring device of a kind of audiomonitor, including semiconductor laser transmitter 1, laser eavesdropping discharger 2, laser beam expanding optical system 3, transmitting laser system 4, airtight box 5, adopts 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 amplifies 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 between described voice modulation amplifier 11 with described audio output 10 and has noise reduction process system 9.
As a kind of technical optimization scheme of the present utility model: 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.
As a kind of technical optimization scheme of the present utility model: 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 the range of signal making reception device receive is wide.
As a kind of technical optimization scheme of the present utility model: 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 can be modulated infrared ray and send.
As a kind of technical optimization scheme of the present utility model: described transmitting laser system 4 sends continuous print 5mW near infrared light, and wave-length coverage is about at 790-820nm.The power of 5mW is enough in laser eavesdropping, and working range can reach lkm.
As a kind of technical optimization scheme of the present utility model: 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 not consider atmospheric scattering；This laser instrument is easy to carry, easily carries 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 infrared directivity and the feature of monochromaticity to this utility model, uses 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, slight vibration is there is in glass because being affected by indoor sound variation, 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 in the case of incident direction is constant is changed.Can learn that the luminous power of reflection light changes the most 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, and 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 issuing when, 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 directly be played back by 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 this utility model is not limited to the details of above-mentioned one exemplary embodiment, and in the case of without departing substantially from spirit or essential attributes of the present utility model, it is possible to realize this utility model in other specific forms.Therefore, no matter from the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, scope of the present utility model is limited by claims rather than described above, it is intended that all changes fallen in the implication of equivalency and scope of claim included in this utility model.Should not be considered as limiting involved claim by any reference in claim.
In addition, it is to be understood that, although this specification is been described by according to embodiment, but the most each embodiment only comprises an independent technical scheme, this narrating mode of description is only for clarity sake, description should can also be formed, through appropriately combined, other embodiments that it will be appreciated by those skilled in the art that as an entirety, the technical scheme in each embodiment by those skilled in the art.