CN204859188U - Laser modulation signal collector - Google Patents
Laser modulation signal collector Download PDFInfo
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- CN204859188U CN204859188U CN201520600719.9U CN201520600719U CN204859188U CN 204859188 U CN204859188 U CN 204859188U CN 201520600719 U CN201520600719 U CN 201520600719U CN 204859188 U CN204859188 U CN 204859188U
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- circuit
- laser
- modulation
- diode
- modulated
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Abstract
The utility model discloses a laser modulation signal collector. It includes audio frequency amplitude modulation modulated circuit, voltage -current conversion circuit, laser diode, silicon optical diode, modulated current signaling conversion circuit, resonance amplifier circuit, demodulation circuit, filter circuit, low frequency amplifier circuit, and audio frequency amplitude modulation modulated circuit passes through the voltage -current conversion circuit and links to each other with laser diode, and laser diode, silicon optical diode, modulated current signaling conversion circuit, resonance amplifier circuit, demodulation circuit, filter circuit, low frequency amplifier circuit are consecutive, audio frequency amplitude modulation modulated circuit still be connected with MSP430 single chip microcomputer control. The utility model discloses an amplitude modulation modulation mode's laser has stronger interference killing feature, does not need the signal of photoelectric device transmission upper frequency, and collection effect is good, and the practicality is strong.
Description
Technical field
The utility model relates to audio mining technique field, is specifically related to laser modulation signal collector.
Background technology
The approach of information collection is varied, penetrates into present various high-tech investigation monitoring means from initial spy.Turn in main war in the modern times with information, the effect of high-tech investigation audiomonitor in war is also more and more important.Public security officer in case fact-finding process, in order to grasp clue to solve the case specifically and collect evidence, micro radio monitoring device is placed on the place that suspect often haunts, obtains their conversation content.Monitoring like this needs wireless monitor device to have well to pretend function, needs to apply various technique and method cleverly.Because laser monitoring technique is different from Ordinary Electromagnetic Wave listening mode, this kind of mode has good anti-electromagnetic interference capability.Meanwhile, laser monitoring technique is again a kind of non-mounted listening mode, and therefore it has unique advantage in camouflage monitoring.
Utility model content
For solving the problem, the utility model provides laser modulation signal collector, adopts the laser of amplitude-modulating modulation mode, has stronger antijamming capability, and do not need photoelectric device to transmit the signal of upper frequency, collection effect is good, practical.
For achieving the above object, the technical scheme that the utility model is taked is: laser modulation signal collector, comprise amplitude modulation by tone modulation circuit, voltage-current converter circuit, laser diode, silicon photo diode, modulated current signal change-over circuit, oscillator amplifier circuit, demodulator circuit, filter circuit, low-frequency amplifier circuit, amplitude modulation by tone modulation circuit is connected with laser diode by voltage-current converter circuit, laser diode, silicon photo diode, modulated current signal change-over circuit, oscillator amplifier circuit, demodulator circuit, filter circuit, low-frequency amplifier circuit is connected successively, described amplitude modulation by tone modulation circuit is also connected with MSP430 Single-chip Controlling.
As preferably, described voltage-current converter circuit adopts transconcluctance amplifier.
As preferably, described silicon photo diode is that light-emitting diode and resistant series form.
The utility model has following beneficial effect: the laser adopting amplitude-modulating modulation mode, has stronger antijamming capability, and do not need photoelectric device to transmit the signal of upper frequency, collection effect is good, practical.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is voltage-current converter circuit figure of the present utility model;
Fig. 3 is the circuit diagram of silicon photo diode of the present utility model;
Fig. 4 is the equivalent circuit diagram of Fig. 3.
Embodiment
In order to make the purpose of this utility model and advantage clearly understand, below in conjunction with embodiment, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
As Figure 1-4, the utility model embodiment provides laser modulation signal collector, comprise amplitude modulation by tone modulation circuit 1, voltage-current converter circuit 2, laser diode 3, silicon photo diode 4, modulated current signal change-over circuit 5, oscillator amplifier circuit 6, demodulator circuit 7, filter circuit 8, low-frequency amplifier circuit 9, amplitude modulation by tone modulation circuit 1 is connected with laser diode 3 by voltage-current converter circuit 2, laser diode 3, silicon photo diode 4, modulated current signal change-over circuit 5, oscillator amplifier circuit 6, demodulator circuit 7, filter circuit 8, low-frequency amplifier circuit 9 is connected successively, described amplitude modulation by tone modulation circuit 1 is also connected with MSP430 Single-chip Controlling.
It should be noted that described voltage-current converter circuit 2 adopts transconcluctance amplifier.
In addition, described silicon photo diode 4 forms for light-emitting diode and resistant series.
The operation principle of this embodiment: single-frequency audio signal (as 500Hz or 1000Hz) is modulated on the sine wave of 100kHz, by the modulated voltage signal obtained, current signal is converted to by voltage-current converter circuit (transconcluctance amplifier), driving laser diode, produces voice modulation laser signal source.The operation such as the conversion of voice modulation current signal, oscillator amplifier circuit received by silicon photo diode, removes other clutters, then passes through demodulation, filtering, low-frequency amplifier circuit, restore original audio signal, carries out power amplification, promote loud speaker, reduction audio signal.
The audio collection mode of this embodiment is: on the basis of first stage, constantly reduces the amplitude of input audio signal, by improving the performance of opto-electronic receiver and post processing electric circuit, parses original audio signal.When the little useful signal to obtaining with optical lever system of the audio signal inputted is at the same order of magnitude, namely opto-electronic receiver now and post processing electric circuit reach necessary requirement.Now, change amplitude modulation by tone modulation circuit into 100kHz sine wave generating circuit, non-installing type audio collection device can be realized.
The above is only preferred implementation of the present utility model; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (3)
1. laser modulation signal collector, it is characterized in that, comprise amplitude modulation by tone modulation circuit (1), voltage-current converter circuit (2), laser diode (3), silicon photo diode (4), modulated current signal change-over circuit (5), oscillator amplifier circuit (6), demodulator circuit (7), filter circuit (8), low-frequency amplifier circuit (9), amplitude modulation by tone modulation circuit (1) is connected with laser diode (3) by voltage-current converter circuit (2), laser diode (3), silicon photo diode (4), modulated current signal change-over circuit (5), oscillator amplifier circuit (6), demodulator circuit (7), filter circuit (8), (9 are connected low-frequency amplifier circuit successively, described amplitude modulation by tone modulation circuit (1) is also connected with MSP430 Single-chip Controlling.
2. laser modulation signal collector according to claim 1, is characterized in that, described voltage-current converter circuit (2) adopts transconcluctance amplifier.
3. laser modulation signal collector according to claim 1, is characterized in that, described silicon photo diode (4) forms for light-emitting diode and resistant series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520600719.9U CN204859188U (en) | 2015-08-06 | 2015-08-06 | Laser modulation signal collector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520600719.9U CN204859188U (en) | 2015-08-06 | 2015-08-06 | Laser modulation signal collector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204859188U true CN204859188U (en) | 2015-12-09 |
Family
ID=54749699
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520600719.9U Expired - Fee Related CN204859188U (en) | 2015-08-06 | 2015-08-06 | Laser modulation signal collector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204859188U (en) |
-
2015
- 2015-08-06 CN CN201520600719.9U patent/CN204859188U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151209 Termination date: 20160806 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |