CN104348543A - Glass vibration eavesdropping system - Google Patents
Glass vibration eavesdropping system Download PDFInfo
- Publication number
- CN104348543A CN104348543A CN201310346218.8A CN201310346218A CN104348543A CN 104348543 A CN104348543 A CN 104348543A CN 201310346218 A CN201310346218 A CN 201310346218A CN 104348543 A CN104348543 A CN 104348543A
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- CN
- China
- Prior art keywords
- glass
- vibration
- silicon photocell
- eavesdropping
- signal
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Abstract
The invention provides a glass vibration eavesdropping system. A set of audio monitoring system is designed and manufactured by using a photoelectric detection principle; the system is placed outdoors; a laser beam is emitted to the glass of a window and is reflected into a sensor silicon photocell; a sound signal propagated indoors reaches the glass and enables the glass to do micro chemical vibration, and the micro vibration of the glass causes change in intensity of the laser of the silicon photocell; a light signal is converted into a micro photocurrent signal through the silicon photocell and can be reduced into an indoor sound signal content through a filtering and amplifying circuit, so that monitoring and recording effects can be achieved. The system has the advantages of wide application range, simplicity, convenience, low cost, capability of quickly building a monitoring platform and good sound effect.
Description
Technical field
The present invention relates to monitoring system, particularly a kind of glass vibration eavesdropping system.
Background technology
Eavesdropping develops swift and violent in recent years, coil is connected on certain communication line to Eavesdropping more advanced now from initial, as microtelephone tapping device, circuit carrier is eavesdropped, telephone tapping and laser eavesdropping etc., wherein laser is monitored along with the development of science and technology is progressively ripe, and moves towards to use, object is herein on the basis of the general principle analyzing laser monitoring technique, utilizes simple, cheap device to build pilot system.
Current audiomonitor depend on more communication business communication service, such as at patent CN 102075926 A when monitoring the communication service that terminal is carried out, the user ID that obtaining communication business is corresponding; Send monitored data request message to motoring gateway, described monitored data request message comprises the type of service of described user ID and described communication service, performs monitoring service to trigger described motoring gateway according to described monitored data request message.The audiomonitor of the embodiment of the present invention, monitor method and system, monitored data request message is sent to LIG whether monitored with inquiring user mark by NE, and the monitored data that NE returns according to LIG is monitored etc., make NE side no longer can store the monitored data of user.But the shortcoming of this invention is once signal interruption will affect monitoring effect, and easily causes information leakage.
Summary of the invention
A kind of glass vibration is the object of the present invention is to provide to eavesdrop system.
For reaching above object, the present invention by the following technical solutions:
Utilize optical detection principle to design and make a set of audio select system.System is positioned over outdoor, to launch on glass that beam of laser is mapped to window and reflection enters into transducer silicon photocell, the voice signal of indoor propagation runs into glass and makes it do Small mechanical vibrations, the microvibration of glass can cause the change of the laser intensity entering silicon photocell, light signal changes into small photo-signal through silicon photocell, by filtering and amplifying circuit, indoor sound signal content can be reduced, can to reach the effect of monitoring, record.
Beneficial effect of the present invention is:
The present invention is applied widely, simple and convenient, cost is low, and can build rapidly monitoring platform, sound effect is good.
Embodiment
The present invention mainly comprises three parts: emitter, receiving system, signal processing apparatus,
Emitter of the present invention is 650nm semiconductor laser; Receiving system of the present invention is: photodetector, optical focus mirror, monochromatic filter.Filter can eliminate the interference of environment daylight, avoids the saturated of transducer; Condenser, by after light focusing to focus, acts on silicon photocell, improves the signal to noise ratio of receiving system.
Signal processing: computer, power amplifier, loud speaker.
Signal is elementary to be put into and to adopt amplifier chip LM386, and its gain is adjustable at 20 ~ 200 times, and bandwidth is that this circuit of 50 kHz. is good to the amplification effect of low voltage signal, and driving force is strong, and output signal can the loud speaker of Direct driver 8 Ω.
Sound causes glass vibration, and the hot spot of laser reflection light is subjected to displacement, and the position be radiated on silicon photocell changes.Due to the vibration of glass, make reverberation with the information of sound wave.Regulate photronic position, there is corresponding change in the spot areas be radiated at when hot spot is vibrated on silicon photocell, thus causes the change of silicon photocell output voltage, then this change in voltage is amplified through amplifier, proceeds to loud speaker, just can acoustic.Whole process can be regarded as simply: the signal of telecommunication of voice signal → glass vibration → light signal → faint → amplify → be reduced into sound.
Claims (4)
1. a glass vibration eavesdropping system, is characterized in that: the present invention mainly comprises two parts: the present invention mainly comprises three parts: emitter, receiving system, signal processing apparatus.
2. glass vibration eavesdropping system according to claim 1, is characterized in that: emitter of the present invention is 650nm semiconductor laser.
3. glass vibration eavesdropping system according to claim 1, is characterized in that: receiving system of the present invention is: photodetector, optical focus mirror, monochromatic filter.
4. glass vibration eavesdropping system according to claim 1, is characterized in that: signal processing comprises computer, power amplifier, loud speaker, and elementary being put into of signal adopts amplifier chip LM386.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310346218.8A CN104348543A (en) | 2013-08-11 | 2013-08-11 | Glass vibration eavesdropping system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310346218.8A CN104348543A (en) | 2013-08-11 | 2013-08-11 | Glass vibration eavesdropping system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104348543A true CN104348543A (en) | 2015-02-11 |
Family
ID=52503461
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310346218.8A Pending CN104348543A (en) | 2013-08-11 | 2013-08-11 | Glass vibration eavesdropping system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104348543A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112037753A (en) * | 2020-09-04 | 2020-12-04 | 东南大学 | Method and system for restoring sound in real time by using bulb |
-
2013
- 2013-08-11 CN CN201310346218.8A patent/CN104348543A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112037753A (en) * | 2020-09-04 | 2020-12-04 | 东南大学 | Method and system for restoring sound in real time by using bulb |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150211 |
|
| WD01 | Invention patent application deemed withdrawn after publication |