CN103163527B - Laser monitoring device based on charge-coupled device (CCD) auxiliary positioning and double-optical wedge light beam regulation and monitoring method by using same - Google Patents
Laser monitoring device based on charge-coupled device (CCD) auxiliary positioning and double-optical wedge light beam regulation and monitoring method by using same Download PDFInfo
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Abstract
The invention relates to a laser monitoring technology, discloses a laser monitoring device based on charge-coupled device (CCD) auxiliary positioning and double-optical wedge light beam regulation and a monitoring method by using the same and aims to solve the problems that a monitored object is complexly positioned, the optimal vibration point cannot be effectively monitored, the conventional laser monitoring method is influenced by common-mode interference capacity, and monitoring information of an optical signal is limited. The laser monitoring device comprises a multi-dimensional compound regulation table, a laser, a polarization light splitting prism, a lambda/4 glass sheet, a double-light wedge system, a telescoping and amplifying system, a CCD imaging system, a computer, an amplifying circuit and a four-quadrant photoelectric detector. According to the laser monitoring system, a monitored target refection surface is searched by the CCD imaging system and divided into M*N array sub regions, the double-light wedge system is controlled for array scanning to ensure that a laser point falls to the array sub region with the maximum voltage signal, and the voltage signal is converted to a sound signal to obtain monitoring information. The laser monitoring device is applied to laser monitoring field.
Description
Technical field
The present invention relates to a kind of laser monitoring technique.
Background technology
Monitoring and anti-monitoring technique are one of important issue of various countries' national defence always, are widely used in military monitoring, spy's eavesdropping and police surveillance etc.Monitoring technique based on different, comprises multiple audiomonitor.For example, the line that wired eavesdropping utilizes outwardness intercepts target information as telephone wire, grid line and the eavesdropping line that buries in advance etc., but wired eavesdropping must depend on " line ", so easily got rid of by investigation, anti-reconnaissance capability is very weak; It is a kind of passive receive device that software radio is intercepted, by radio-frequency front-end reception, signal processing and computing machine, processing three parts forms, software radio ether watcher advantage is that volume is little, signal band is wide, processing capacity is powerful, upgrading is easy, a compatibility is high, there is high degree of flexibility etc., but signal is directly propagated in broad space, and the menace of divulging a secret is large; Microwave monitoring technique is to using microwave as sensor, by extracting the engineering of being known voice signal property amount by the vibration information of vibration material, but microwave monitoring technique successful variation when intercepting at a distance, and anti-intercept capabilities a little less than.The monitoring principle that laser is monitored is similar with microwave principle, and its specific works principle is as follows:
First at transmitting terminal, the infrared laser that pointolite sends is radiated at modulated terminal, and monitored target vibration is on glass; Because monitored target sound signal can produce acoustic pressure at glass surface, drive glass to do forced vibration, make it near laser incidence point, do near normal vibration, also there is the displacement of corresponding linearity in the optical axis that the micro-displacement of glass makes to reflect laser; At receiving end, by detection, be mapped to the variation of facula position or the area of photoelectric detector window, light signal can be changed into the electric signal of variation, then through to processing such as the filtration of variation electric signal, amplifications, realize the reduction amplification effect of sound; Finally realize the object that laser is monitored.
In Dec, 2003, the publish an article research > > of < < Laser Eavesdropping of the 40th the 12nd phase of volume of laser and optoelectronics progress, traditional laser monitor method introduced in this piece of article.The realization of the method is mainly comprised of emitter and receiving trap, wherein emitter mainly comprises semiconductor laser and optical system, semiconductor laser sends 5mw near infrared light, wavelength coverage is greatly about 790-820nm, in remote eavesdropping, need to use optical beam expander, increase the irradiated area to glass, if beam divergence angle is excessive, sometimes also need to aim at telescopic system, in a word, emission coefficient main task is fallen exactly incident ray and is got to glass central authorities, will keep direction constant simultaneously, receiving trap mainly comprises photodetector, optical receiving system and electrical signal processing system, wherein first monochromatic filter partly passes through catoptrical infrared light, convergent lens is by the focus of light focusing, detector is arranged on the focus place of convergent lens, detector is converted into different electric signal by different infrared energy, regulate, prime amplifier gains the electric signal of being inputted by detector to amplify and be input to note amplifier LM380, note amplifier LM380 can directly drive loudspeaker, and be input to voltage follower, the output valve of voltage follower is directly presented on galvanometer, the size that represents the luminous energy that detector receives.The method has overcome the shortcoming that wired monitoring is easily got rid of by investigation, has also overcome to a certain extent microwave simultaneously and has intercepted the deficiency of monitoring apart from short.But the shortcoming of traditional monitor method is: dispensing device is separated with receiving trap, the building of monitoring system, locate, adjusting etc. is more complicated; In remote monitoring, light signal is too faint; Common mode noise signal is larger on monitoring quality impact.
In February, 2008, laser and infrared this piece of article introduced the 38th the 2nd phase of volume publish an article < < Laser Eavesdropping improvement with realize > >, this piece of article introduced a kind of utilization " opal " principle laser monitoring technique carried out to improved method.The method installs " opal " additional in monitored vibration end, having focal length is the convex lens of f, and the monitored plane of oscillation is overlapped with " opal " focal plane, thus make reflection ray and incident ray parallel to each other, like this, transmitting terminal and receiving end can be combined in a system; When sound wave effect is during in " opal " target, cause optical system vibration, make it depart from origin-location, different incident angle corresponding to position, different defocusing amount corresponding to incident angle, different defocusing amounts causes that the catoptrical angle of divergence is different, finally causes the difference of surveying echoed signal power.The ratio of the method definition echo power and emissive power is power contrast degree M, and the pass of deriving power contrast degree and defocusing amount is:
The method has overcome classical way emitter and laser instrument unstable cause monitoring signal unsettled shortcoming separated with receiving trap.But the method belongs to half intrusive mood eavesdropping, once opal, by investigation discovery, is monitored i.e. failure.
Above-mentioned two kinds of methods have following shortcoming:
(1) lack system and the device being specifically designed to monitored target plane of oscillation location, make in laser instrument use procedure to regulate more complicated, once the target plane of oscillation changes, need to again regulate, process is more complicated, and incident light irradiation position might not be to monitor the best position of effect.
(2) the common mode amounts such as surround lighting are lacked and effectively suppress method;
(3) photodetector is only that echo power size is surveyed, and the monitoring information that echo power comprises is limited.
Summary of the invention
The object of the invention is for solve existing laser monitor method location complicated, cannot effectively monitor optimal vibration point, affected with luminous power by common mode amount interference volume to comprise the limited problem of monitoring information, a kind of laser monitoring device based on CCD auxiliary positioning-bis-wedge light beam regulation is provided and adopts this device to realize the method for monitoring.
Laser monitoring device based on CCD auxiliary positioning-bis-wedge light beam regulation of the present invention comprises the compound regulating platform 1 of multidimensional, laser instrument 2, polarization splitting prism 3, λ/4 slide 4, two wedge systems 5, the amplification system 6 of looking in the distance, CCD imaging system 7, computing machine 8, amplifying circuit 9 and four-quadrant photo detector 10, laser instrument 2, polarization splitting prism 3, λ/4 slide 4, the sharp direction of light that two wedge systems 5 and the amplification system 6 of looking in the distance are launched along laser instrument 2 is arranged in order, and the output optical axis of laser instrument 2, λ/4 slide 4, the central shaft of two wedge systems 5 and the amplification system 6 of looking in the distance overlaps, two wedge control signal output terminals of computing machine 8 are connected with the control signal input end of two wedge systems 5, the signal output part of CCD imaging system 7 is connected with the ccd signal input end of computing machine 8, a quadrant signal output terminal of four-quadrant photo detector 10, b quadrant signal output terminal, c quadrant signal output terminal and d quadrant signal output terminal respectively with a quadrant signal input end of amplifying circuit 9, b quadrant signal input end, c quadrant signal input end is connected with d quadrant signal input end, the voltage signal output end of amplifying circuit 9, x direction voltage signal output end and y direction voltage signal output end respectively with the photodetector voltage signal input end of computing machine 8, x direction voltage signal input end is connected with y direction voltage signal input end, and laser instrument 2 is fixed on the compound regulating platform 1 of multidimensional.
The amplifying circuit 9 of the laser monitoring device based on CCD auxiliary positioning-bis-wedge light beam regulation of the present invention comprises pre-amplification circuit A, summation amplifying circuit, pre-amplification circuit B, differentiating circuit, subtraction circuit A and subtraction circuit B, differentiating circuit respectively to time differentiate, and is exported the result after differentiate respectively a quadrant signal input end of pre-amplification circuit A by the signal of input, b quadrant signal input end, c quadrant signal input end and d quadrant signal input end are respectively a quadrant signal input end of amplifying circuit 9, b quadrant signal input end, c quadrant signal input end and d quadrant signal input end, a quadrant signal input end of pre-amplification circuit A, b quadrant signal input end, c quadrant signal input end and d quadrant signal input end respectively with a quadrant signal input end of pre-amplification circuit B, b quadrant signal input end, c quadrant signal input end is connected with d quadrant signal input end, a quadrant signal output terminal of pre-amplification circuit A, b quadrant signal output terminal, c quadrant signal output terminal and d quadrant signal output terminal respectively with summation amplifying circuit a quadrant signal input end, b quadrant signal input end, c quadrant signal input end is connected with d quadrant signal input end, a quadrant signal output terminal of pre-amplification circuit B, b quadrant signal output terminal, c quadrant signal output terminal and d quadrant signal output terminal respectively with a quadrant signal input end of differentiating circuit, b quadrant signal input end, c quadrant signal input end is connected with d quadrant signal input end, a quadrant signal output terminal of differentiating circuit, b quadrant signal output terminal, c quadrant signal output terminal and d quadrant signal output terminal respectively with a quadrant signal input end of subtraction circuit A, b quadrant signal input end, c quadrant signal input end is connected with d quadrant signal input end, a quadrant signal input end of subtraction circuit A, b quadrant signal input end, c quadrant signal input end and d quadrant signal input end respectively with a quadrant signal input end of subtraction circuit B, d quadrant signal input end, c quadrant signal input end is connected with b quadrant signal input end, the voltage signal output end of summation amplifying circuit is the voltage signal output end of amplifying circuit 9, the voltage signal output end of subtraction circuit A is the x direction voltage signal output end of amplifying circuit 9, and the voltage signal output end of subtraction circuit B is the y direction voltage signal output end of amplifying circuit 9.
The pass of differentiating circuit output signal and input signal is: a quadrant signal output terminal output signal is a quadrant signal input end input signal time differential, b quadrant signal output terminal output signal is b quadrant signal input end input signal time differential, c quadrant signal output terminal output signal is c quadrant signal input end input signal time differential, and d quadrant signal output terminal output signal is d quadrant signal input end input signal time differential.
The output signal of subtraction circuit A and the pass of input signal are:
Output signal=(a quadrant signal input end input signal+d quadrant signal input end input signal)-(b quadrant signal is defeated
Enter to hold input signal+c quadrant signal input end input signal);
The output signal of subtraction circuit B and the pass of input signal are:
Output signal=(a quadrant signal input end input signal+b quadrant signal input end input signal)-(c quadrant signal input end input signal+d quadrant signal input end input signal).
The amplification coefficient of subtraction circuit A in the amplifying circuit 9 of the laser monitoring device based on CCD auxiliary positioning-bis-wedge light beam regulation of the present invention equates with the amplification coefficient of subtraction circuit B.
The above-mentioned laser monitoring device based on CCD auxiliary positioning-bis-wedge light beam regulation is realized the method for monitoring and is realized by following steps:
Step 1, startup laser instrument 2, position and the angle of adjusting CCD imaging system 7, make 7 pairs of monitored target reflectings surface of CCD imaging system carry out imaging;
Step 2, computing machine 8 gather CCD imaging data and target reflecting surface are divided into M * N array subregion,
Utilize line number and the columns (i, j) of described array subregion to define this region, initialization array region (i, j)=(1,1);
Step 3, computing machine 8 are controlled two wedge systems 5 and are carried out array scanning, obtain the voltage signal values U of each array subregion
i,j;
The voltage signal values U of each array subregion that step 4, computing machine 8 obtain according to step 3
i,j, determine the band of position (x, y) of voltage signal values maximum;
Step 5, computing machine 8 regulate two wedge systems 5, and the laser spots that laser instrument 2 is sent drops on voltage signal values Ui,
jin maximum array subregion (x, y);
Step 6, computing machine 8 gather the voltage signal that four-quadrant photo detector 10 sends
U
x=k[(dI
a/dt+dI
d/dt)-(dI
b/dt+dI
c/dt)]
Or
U
y=k[(dI
a/dt+dI
b/dt)-(dI
c/dt+dI
d/dt)]，
By voltage signal U
xor U
ybe converted to voice signal and process and store, obtaining monitoring information;
Wherein, k=a
2b
2c, a
2for the amplification coefficient of pre-amplification circuit B, b
2for the amplification coefficient of differentiating circuit, c is the amplification coefficient of subtraction circuit A and subtraction circuit B, I
a, I
b, I
cand I
dbe respectively four current signal value that quadrant sends of four-quadrant photo detector 10.
Computing machine 8 described in the step 3 of the method that the laser monitoring device realization based on CCD auxiliary positioning-bis-wedge light beam regulation of the present invention is monitored is controlled two wedge systems 5 and is carried out array scanning, obtains the voltage signal values Ui of each array subregion,
jprocess by following steps, realize:
Steps A, computing machine 8 regulate spacing and the angle of two wedges in two wedge systems 5, make laser that laser instrument 2 sends successively by polarization splitting prism 3, λ/4 slide 4, two wedge system 5 with look in the distance after amplification system 6, be radiated in monitored target reflecting surface array subregion (i, j); Execution step B;
Step B, array subregion (i, j) light signal being reflected back is successively by entering four-quadrant photo detector 10 after the amplification system 6 of looking in the distance, two wedge system 5, λ/4 slide 4 and polarization splitting prism 3, described i and j are respectively line number and the columns at the array subregion place at target reflecting surface inner laser point place, four-quadrant photo detector 10 converts the light signal being reflected back to voltage signal, this voltage signal of computer acquisition, execution step C;
Step C, judging whether i is odd number, is to perform step F if judgment result is that; Otherwise, execution step D;
Step D, judging whether the value of j equals 1, is to perform step H if judgment result is that; Otherwise execution step E;
Step e, j=j-1; Return to steps A;
Step F, judging whether the value of j equals N, is to perform step H if judgment result is that; Otherwise execution step G;
Step G, j=j+1; Return to steps A;
Step H, judge that whether the value of i equals M, if the determination result is NO, performs step I; Otherwise finish array scanning process;
Step I, i=i+1; Return to steps A.
Laser aid based on CCD auxiliary positioning-bis-wedge light beam regulation of the present invention is realized the method for monitoring and by CCD imaging system, monitored target is positioned, by being carried out to array scanning, monitored target reflecting surface finds optimal vibration point, by subtraction circuit A or subtraction circuit B, eliminating common mode amount disturbs, utilize four-quadrant photo detector to detect reflected light vibration position information, and then obtain effective monitoring information, have monitored target localization simple, can effectively monitor optimal vibration point, not affected with light signal by common mode amount interference volume and comprise the advantage that monitoring information amount is large.
Accompanying drawing explanation
Fig. 1 is the laser monitoring device structural drawing based on CCD auxiliary positioning-bis-wedge light beam regulation of the present invention;
Fig. 2 is the principle schematic of the amplifying circuit of the laser monitoring device based on CCD auxiliary positioning-bis-wedge light beam regulation of the present invention;
Fig. 3 is four-quadrant photo detector planar structure schematic diagram;
Fig. 4 is the laser monitor method process flow diagram based on CCD auxiliary positioning-bis-wedge light beam regulation;
Fig. 5 is M * N array region figure of target vibration reflecting surface.
Embodiment
Embodiment one: in conjunction with Fig. 1, present embodiment is described, the laser monitoring device based on CCD auxiliary positioning-bis-wedge light beam regulation described in present embodiment comprises the compound regulating platform 1 of multidimensional, laser instrument 2, polarization splitting prism 3, λ/4 slide 4, two wedge systems 5, the amplification system 6 of looking in the distance, CCD imaging system 7, computing machine 8, amplifying circuit 9 and four-quadrant photo detector 10, laser instrument 2, polarization splitting prism 3, λ/4 slide 4, the sharp direction of light that two wedge systems 5 and the amplification system 6 of looking in the distance are launched along laser instrument 2 is arranged in order, and the output optical axis of laser instrument 2, λ/4 slide 4, the central shaft of two wedge systems 5 and the amplification system 6 of looking in the distance overlaps, two wedge control signal output terminals of computing machine 8 are connected with the control signal input end of two wedge systems 5, the signal output part of CCD imaging system 7 is connected with the ccd signal input end of computing machine 8, a quadrant signal output terminal of four-quadrant photo detector 10, b quadrant signal output terminal, c quadrant signal output terminal and d quadrant signal output terminal respectively with a quadrant signal input end of amplifying circuit 9, b quadrant signal input end, c quadrant signal input end is connected with d quadrant signal input end, the voltage signal output end of amplifying circuit 9, x direction voltage signal output end and y direction voltage signal output end respectively with the photodetector voltage signal input end of computing machine 8, x direction voltage signal input end is connected with y direction voltage signal input end, and laser instrument 2 is fixed on the compound regulating platform 1 of multidimensional.
Embodiment two: in conjunction with Fig. 2, present embodiment is described, the difference of the laser monitoring device based on CCD auxiliary positioning-bis-wedge light beam regulation described in present embodiment and embodiment one is: described amplifying circuit 9 comprises pre-amplification circuit A, summation amplifying circuit, pre-amplification circuit B, differentiating circuit, subtraction circuit A and subtraction circuit B, differentiating circuit respectively to time differentiate, and is exported the result after differentiate respectively a quadrant signal input end of pre-amplification circuit A by the signal of input, b quadrant signal input end, c quadrant signal input end and d quadrant signal input end are respectively a quadrant signal input end of amplifying circuit 9, b quadrant signal input end, c quadrant signal input end and d quadrant signal input end, a quadrant signal input end of pre-amplification circuit A, b quadrant signal input end, c quadrant signal input end and d quadrant signal input end respectively with a quadrant signal input end of pre-amplification circuit B, b quadrant signal input end, c quadrant signal input end is connected with d quadrant signal input end, a quadrant signal output terminal of pre-amplification circuit A, b quadrant signal output terminal, c quadrant signal output terminal and d quadrant signal output terminal respectively with summation amplifying circuit a quadrant signal input end, b quadrant signal input end, c quadrant signal input end is connected with d quadrant signal input end, a quadrant signal output terminal of pre-amplification circuit B, b quadrant signal output terminal, c quadrant signal output terminal and d quadrant signal output terminal respectively with a quadrant signal input end of differentiating circuit, b quadrant signal input end, c quadrant signal input end is connected with d quadrant signal input end, a quadrant signal output terminal of differentiating circuit, b quadrant signal output terminal, c quadrant signal output terminal and d quadrant signal output terminal respectively with a quadrant signal input end of subtraction circuit A, b quadrant signal input end, c quadrant signal input end is connected with d quadrant signal input end, a quadrant signal input end of subtraction circuit A, b quadrant signal input end, c quadrant signal input end and d quadrant signal input end respectively with a quadrant signal input end of subtraction circuit B, d quadrant signal input end, c quadrant signal input end is connected with b quadrant signal input end, the voltage signal output end of summation amplifying circuit is the voltage signal output end of amplifying circuit 9, the voltage signal output end of subtraction circuit A is the x direction voltage signal output end of amplifying circuit 9, the voltage signal output end of subtraction circuit B is the y direction voltage signal output end of amplifying circuit 9
The pass of differentiating circuit output signal and input signal is: a quadrant signal output terminal output signal is a quadrant signal input end input signal time differential, b quadrant signal output terminal output signal is b quadrant signal input end input signal time differential, c quadrant signal output terminal output signal is c quadrant signal input end input signal time differential, and d quadrant signal output terminal output signal is d quadrant signal input end input signal time differential;
The output signal of subtraction circuit A and the pass of input signal are:
Output signal=(a quadrant signal input end input signal+d quadrant signal input end input signal)-(b quadrant signal is defeated
Enter to hold input signal+c quadrant signal input end input signal);
The output signal of subtraction circuit B and the pass of input signal are:
Output signal=(a quadrant signal input end input signal+b quadrant signal input end input signal)-(c quadrant signal is defeated
Enter to hold input signal+d quadrant signal input end input signal).
Embodiment three: in conjunction with Fig. 2, present embodiment is described, the difference of the laser monitoring device based on CCD auxiliary positioning-bis-wedge light beam regulation described in present embodiment and embodiment two is: the pass of described differentiating circuit output signal and input signal is:
A quadrant signal output terminal output signal is a quadrant signal input end input signal time differential,
B quadrant signal output terminal output signal is b quadrant signal input end input signal time differential,
C quadrant signal output terminal output signal is c quadrant signal input end input signal time differential,
D quadrant signal output terminal output signal is d quadrant signal input end input signal time differential.
Embodiment four: in conjunction with Fig. 2, present embodiment is described, the difference of the laser monitoring device based on CCD auxiliary positioning-bis-wedge light beam regulation described in present embodiment and embodiment two is: the output signal of described subtraction circuit A and the pass of input signal are:
Output signal=(a quadrant signal input end input signal+d quadrant signal input end input signal)-(b quadrant signal input end input signal+c quadrant signal input end input signal);
The output signal of described subtraction circuit B and the pass of input signal are:
Output signal=(a quadrant signal input end input signal+b quadrant signal input end input signal)-(c quadrant signal input end input signal+d quadrant signal input end input signal).
Embodiment five: in conjunction with Fig. 2, present embodiment is described, present embodiment is with the difference of the laser monitoring device based on CCD auxiliary positioning-bis-wedge light beam regulation described in embodiment two: the amplification coefficient of described subtraction circuit A equates with the amplification coefficient of subtraction circuit B.
Embodiment six: in conjunction with Fig. 4, present embodiment is described, described in present embodiment is that the laser monitoring device based on CCD auxiliary positioning-bis-wedge light beam regulation described in embodiment one is realized the method for monitoring, and described method realizes by following steps:
Step 1, startup laser instrument 2, position and the angle of adjusting CCD imaging system 7, what make CCD imaging system 7 imagings is monitored target reflecting surface;
Step 2, computing machine 8 gather CCD imaging data and target reflecting surface are divided into M * N array subregion,
Utilize line number and the columns (i, j) of described array subregion to define this region, initialization array region (i, j)=(1,1);
Step 3, computing machine 8 are controlled two wedge systems 5 and are carried out array scanning, obtain the voltage signal values U of each array subregion
i,j;
The voltage signal values U of each array subregion that step 4, computing machine 8 obtain according to step 3
i,j, determine the band of position (x, y) of voltage signal values maximum;
Step 5, computing machine 8 regulate two wedge systems 5, and the laser spots that laser instrument 2 is sent drops on voltage signal values Ui,
jin maximum array subregion (x, y);
Step 6, computing machine 8 gather the voltage signal that four-quadrant photo detector 10 sends
U
x=k[(dI
a/dt+dI
d/dt)-(dI
b/dt+dI
c/dt)]
Or
U
y=k[(dI
a/dt+dI
b/dt)-(dI
c/dt+dI
d/dt)]，
By voltage signal U
xor U
ybe converted to voice signal and process and store, obtaining monitoring information;
Wherein, k=a
2b
2c, a
2for the amplification coefficient of pre-amplification circuit B, b
2for the amplification coefficient of differentiating circuit, c is the amplification coefficient of subtraction circuit A and subtraction circuit B, I
a, I
b, I
cand I
dbe respectively four current signal value that quadrant sends of four-quadrant photo detector 10.
The laser monitor method based on CCD auxiliary positioning-bis-wedge light beam regulation described in present embodiment utilizes 7 pairs of monitored targets of CCD imaging system to position, and localization method is simple; By monitored target reflecting surface is carried out to the band of position that array scanning is found voltage signal maximal value place, can effectively monitor optimal vibration point; By subtraction circuit A or subtraction circuit B, eliminating common mode amount disturbs; Utilize 10 pairs of reflected light of four-quadrant photo detector to survey, the change in location of 10 pairs of light of four-quadrant photo detector is responsive, and the monitoring information amount that the light signal of acquisition comprises is large.
Embodiment seven, in conjunction with Fig. 4 and Fig. 5, present embodiment is described, the difference that the laser monitoring device based on CCD auxiliary positioning-bis-wedge light beam regulation described in present embodiment and embodiment four is realized the method for monitoring is: the computing machine 8 described in the step 3 of described method is controlled two wedge systems 5 and carried out array scanning, obtains the voltage signal values U of each array subregion
i,jprocess by following steps, realize:
Steps A, computing machine 8 regulate spacing and the angle of two wedges in two wedge systems 5, make laser that laser instrument 2 sends successively by polarization splitting prism 3, λ/4 slide 4, two wedge system 5 with look in the distance after amplification system 6, be radiated in monitored target reflecting surface array subregion (i, j); Execution step B;
Step B, array subregion (i, j) light signal being reflected back is successively by entering four-quadrant photo detector 10 after the amplification system 6 of looking in the distance, two wedge system 5, λ/4 slide 4 and polarization splitting prism 3, described i and j are respectively line number and the columns at the array subregion place at target reflecting surface inner laser point place, four-quadrant photo detector 10 converts the light signal being reflected back to voltage signal, this voltage signal of computer acquisition, execution step C;
Step C, judging whether i is odd number, is to perform step F if judgment result is that; Otherwise, execution step D;
Step D, judging whether the value of j equals 1, is to perform step H if judgment result is that; Otherwise execution step E;
Step e, j=j-1; Return to steps A;
Step F, judging whether the value of j equals N, is to perform step H if judgment result is that; Otherwise execution step G;
Step G, j=j+1; Return to steps A;
Step H, judge that whether the value of i equals M, if the determination result is NO, performs step I; Otherwise finish array scanning process;
Step I, i=i+1; Return to steps A.
Four-quadrant photo detector 10 converts the light signal being reflected back to voltage signal U
i,j=k
1(I
a+ I
b+ I
c+ I
d), k wherein
1=a
1b
1, a
1for the amplification coefficient of pre-amplification circuit A, b
1amplification coefficient for summation amplifying circuit.
Claims (6)
1. the laser monitoring device based on CCD auxiliary positioning-bis-wedge light beam regulation, is characterized in that: described laser monitoring device comprises the compound regulating platform of multidimensional (1), laser instrument (2), polarization splitting prism (3), λ/4 slide (4), two wedge systems (5), the amplification system of looking in the distance (6), CCD imaging system (7), computing machine (8), amplifying circuit (9) and four-quadrant photo detector (10), laser instrument (2), polarization splitting prism (3), λ/4 slide (4), two wedge systems (5) and the amplification system of looking in the distance (6) are arranged in order along the sharp direction of light of laser instrument (2) transmitting, and the output optical axis of laser instrument (2), λ/4 slide (4), the central shaft of two wedge systems (5) and the amplification system of looking in the distance (6) overlaps, two wedge control signal output terminals of computing machine (8) are connected with the control signal input end of two wedge systems (5), the signal output part of CCD imaging system (7) is connected with the ccd signal input end of computing machine (8), a quadrant signal output terminal of four-quadrant photo detector (10), b quadrant signal output terminal, c quadrant signal output terminal and d quadrant signal output terminal respectively with a quadrant signal input end of amplifying circuit (9), b quadrant signal input end, c quadrant signal input end is connected with d quadrant signal input end, the voltage signal output end of amplifying circuit (9), x direction voltage signal output end and y direction voltage signal output end respectively with the photodetector voltage signal input end of computing machine (8), x direction voltage signal input end is connected with y direction voltage signal input end, and laser instrument (2) is fixed on the compound regulating platform of multidimensional (1),
The amplifying circuit of described laser monitoring device (9) comprises pre-amplification circuit A, summation amplifying circuit, pre-amplification circuit B, differentiating circuit, subtraction circuit A and subtraction circuit B, differentiating circuit respectively to time differentiate, and is exported the result after differentiate respectively a quadrant signal input end of pre-amplification circuit A by the signal of input, b quadrant signal input end, c quadrant signal input end and d quadrant signal input end are respectively a quadrant signal input end of amplifying circuit (9), b quadrant signal input end, c quadrant signal input end and d quadrant signal input end, a quadrant signal input end of pre-amplification circuit A, b quadrant signal input end, c quadrant signal input end and d quadrant signal input end respectively with a quadrant signal input end of pre-amplification circuit B, b quadrant signal input end, c quadrant signal input end is connected with d quadrant signal input end, a quadrant signal output terminal of pre-amplification circuit A, b quadrant signal output terminal, c quadrant signal output terminal and d quadrant signal output terminal respectively with summation amplifying circuit a quadrant signal input end, b quadrant signal input end, c quadrant signal input end is connected with d quadrant signal input end, a quadrant signal output terminal of pre-amplification circuit B, b quadrant signal output terminal, c quadrant signal output terminal and d quadrant signal output terminal respectively with a quadrant signal input end of differentiating circuit, b quadrant signal input end, c quadrant signal input end is connected with d quadrant signal input end, a quadrant signal output terminal of differentiating circuit, b quadrant signal output terminal, c quadrant signal output terminal and d quadrant signal output terminal respectively with a quadrant signal input end of subtraction circuit A, b quadrant signal input end, c quadrant signal input end is connected with d quadrant signal input end, a quadrant signal input end of subtraction circuit A, b quadrant signal input end, c quadrant signal input end and d quadrant signal input end respectively with a quadrant signal input end of subtraction circuit B, d quadrant signal input end, c quadrant signal input end is connected with b quadrant signal input end, the voltage signal output end of summation amplifying circuit is the voltage signal output end of amplifying circuit (9), the voltage signal output end of subtraction circuit A is the x direction voltage signal output end of amplifying circuit (9), and the voltage signal output end of subtraction circuit B is the y direction voltage signal output end of amplifying circuit (9).
2. the laser monitoring device based on CCD auxiliary positioning-bis-wedge light beam regulation according to claim 1, is characterized in that: the pass of described differentiating circuit output signal and input signal is:
A quadrant signal output terminal output signal is a quadrant signal input end input signal time differential,
B quadrant signal output terminal output signal is b quadrant signal input end input signal time differential,
C quadrant signal output terminal output signal is c quadrant signal input end input signal time differential,
D quadrant signal output terminal output signal is d quadrant signal input end input signal time differential.
3. the laser monitoring device based on CCD auxiliary positioning-bis-wedge light beam regulation according to claim 1, is characterized in that: the output signal of described subtraction circuit A and the pass of input signal are:
Output signal=(a quadrant signal input end input signal+d quadrant signal input end input signal)-(b quadrant signal input end input signal+c quadrant signal input end input signal);
The output signal of described subtraction circuit B and the pass of input signal are:
Output signal=(a quadrant signal input end input signal+b quadrant signal input end input signal)-(c quadrant signal input end input signal+d quadrant signal input end input signal).
4. the laser monitoring device based on CCD auxiliary positioning-bis-wedge light beam regulation according to claim 1, is characterized in that: the amplification coefficient of the subtraction circuit A of the amplifying circuit of described laser monitoring device (9) equates with the amplification coefficient of subtraction circuit B.
5. based on the laser monitoring device based on CCD auxiliary positioning-bis-wedge light beam regulation claimed in claim 1, realize the method for monitoring, it is characterized in that: described method realizes by following steps:
Step 1, startup laser instrument (2), position and the angle of adjusting CCD imaging system (7), make CCD imaging system (7) carry out imaging to monitored target reflecting surface;
Step 2, computing machine (8) gather CCD imaging data and target reflecting surface are divided into M * N array subregion, utilize line number and the columns (i, j) of described array subregion to define this region, initialization array region (i, j)=(1,1);
Step 3, computing machine (8) are controlled two wedge systems (5) and are carried out array scanning, obtain the voltage signal values Ui of each array subregion, j;
The voltage signal values U of each array subregion that step 4, computing machine (8) obtain according to step 3
i,j, determine the band of position (x, y) of voltage signal values maximum;
Step 5, computing machine (8) regulate two wedge systems (5), and the laser spots that laser instrument (2) is sent drops on voltage signal values U
i,jin maximum array subregion (x, y);
Step 6, computing machine (8) gather the voltage signal that four-quadrant photo detector (10) sends
U
x=k[(dI
a/dt+dI
d/dt)-(dI
b/dt+dI
c/dt)]
Or
U
y=k[(dI
a/dt+dI
b/dt)-(dI
c/dt+dI
d/dt)]，
By voltage signal U
xor U
ybe converted to voice signal and process and store, obtaining monitoring information;
Wherein, k=a
2b
2c, a
2for the amplification coefficient of pre-amplification circuit B, b
2for the amplification coefficient of differentiating circuit, c is the amplification coefficient of subtraction circuit A and subtraction circuit B, I
a, I
b, I
cand I
dbe respectively four current signal value that quadrant sends of four-quadrant photo detector (10).
6. the laser monitoring device based on CCD auxiliary positioning-bis-wedge light beam regulation according to claim 5 is realized the method for monitoring, it is characterized in that: the computing machine described in the step 3 of described method (8) is controlled two wedge systems (5) and carried out array scanning, obtains the voltage signal values U of each array subregion
i,jprocess by following steps, realize:
Steps A, computing machine (8) regulate spacing and the angle of two wedges in two wedge systems (5), make laser that laser instrument (2) sends successively by after polarization splitting prism (3), λ/4 slide (4), two wedge system (5) and the amplification system of looking in the distance (6), be radiated in monitored target reflecting surface array subregion (i, j); Execution step B;
Step B, array subregion (i, j) light signal being reflected back is successively by entering four-quadrant photo detector (10) after the amplification system of looking in the distance (6), two wedge system (5), λ/4 slide (4) and polarization splitting prism (3), described i and j are respectively line number and the columns at the array subregion place at target reflecting surface inner laser point place, four-quadrant photo detector 10 converts the light signal being reflected back to voltage signal, this voltage signal of computer acquisition, execution step C;
Step C, judging whether i is odd number, is to perform step F if judgment result is that; Otherwise, execution step D;
Step D, judging whether the value of j equals 1, is to perform step H if judgment result is that; Otherwise execution step E;
Step e, j=j-1; Return to steps A;
Step F, judging whether the value of j equals N, is to perform step H if judgment result is that; Otherwise execution step G;
Step G, j=j+1; Return to steps A;
Step H, judge that whether the value of i equals M, if the determination result is NO, performs step I; Otherwise finish array scanning process;
Step I, i=i+1; Return to steps A.
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| CN104036787B (en) * | 2014-03-05 | 2017-12-01 | 佛山科学技术学院 | A kind of speech monitoring method and equipment, and laser reflection sound localization method |
| CN105675115B (en) * | 2016-01-18 | 2019-03-12 | 佛山科学技术学院 | A kind of online vibration measuring system of laser-Doppler and method |
| CN107102337B (en) * | 2017-05-18 | 2020-02-11 | 哈尔滨工业大学 | Visual field compensation measuring method of follow-up laser semi-active azimuth measuring device |
| CN109373816A (en) * | 2018-11-12 | 2019-02-22 | 宋兵 | A kind of laser facula and echo tracking monitoring device |
| CN111007521B (en) * | 2019-12-09 | 2022-04-26 | 北京信息科技大学 | Laser active detection system and target identification method |
| CN111526292B (en) * | 2020-04-30 | 2021-08-03 | 浙江大华技术股份有限公司 | Audio and video mixing monitoring method, equipment and storage device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5285062A (en) * | 1992-04-14 | 1994-02-08 | Hoetron, Inc. | Laser/detector hybrid with mirror source and diffracted return beam |
| US6114684A (en) * | 1998-05-19 | 2000-09-05 | Mc Guire; James F. | Laser listening device detector |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100716589B1 (en) * | 2005-06-24 | 2007-05-09 | 손호원 | Portable eavesdropping detector |
| KR20100131024A (en) * | 2009-06-05 | 2010-12-15 | 안교승 | All in one type of acoustic noise generator and transducer to defeat laser eavesdropping and signal receiver |
-
2013
- 2013-04-02 CN CN201310112928.4A patent/CN103163527B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5285062A (en) * | 1992-04-14 | 1994-02-08 | Hoetron, Inc. | Laser/detector hybrid with mirror source and diffracted return beam |
| US6114684A (en) * | 1998-05-19 | 2000-09-05 | Mc Guire; James F. | Laser listening device detector |
Non-Patent Citations (4)
| Title |
|---|
| 张超凡.激光窃听技术的改进与实现.《激光与红外》.2008,第38卷(第2期),全文. |
| 激光窃听实验探究;甯青松等;《物理实验》;20091231;第29卷(第12期);全文 * |
| 激光窃听技术的改进与实现;张超凡;《激光与红外》;20080229;第38卷(第2期);全文 * |
| 甯青松等.激光窃听实验探究.《物理实验》.2009,第29卷(第12期),全文. |
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