CN1900741A - High spectrum full polarization three dimension imaging integrate detecting system - Google Patents
High spectrum full polarization three dimension imaging integrate detecting system Download PDFInfo
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Abstract
The detection system includes imaging lens, acousto-optic tunable filter plate AOTF, control circuit, linear phase delay LCVR, electronic controller in use for controlling value of voltage applied to LCVR, focal plane array, image collection card, self-adapting structured light projection device, and computer. Being kernel part of whole system, the computer is in use for sending out control commands to control RF drive frequency applied to AOTF so as to change wavelength, and obtain image of object in the wavelength. Also, the computer is in use for controlling value of voltage applied to LCVR so as to change linear phase delay LCVR. Moreover, the computer collects image information of object to be measured, and carries out process for the collected images. The invention possesses integrated capabilities of measuring 3D space, high spectrum and polarization corresponding to scale of object image cell. Features are: good adaptability, and raised detection capability.
Description
Technical field
The present invention relates to a kind of high spectrum full polarization three dimension imaging integrate detecting system spaceborne, airborne and ground remote sensing of the earth and survey of deep space that is used for.
Background technology
Remote optical sensing is from being that light wave and tested atural object interact in essence, thereby influence the parameter (amplitude, frequency, phase place, polarization) of light wave, reaches the process of detection and recognition objective.Remote sensing system be one relate to physics, mathematics, atmosphere, learn, complication system such as thalassography, the physics law that it is followed and traditional physics are essentially different, the further investigation mechanism of remote sensing is the key that improves the remote sensing application level.Yet, aspect remote sensing application, the contradiction that data explosion and information are hungered and thirst is still very remarkable, add up according to NASA, up to the present remote sensing accumulated about in the epidermic pictorial data only the data less than 5% be used, trace it to its cause, mainly be that the means of present Remote Sensing Information Extraction are too single, only rely on the multiband that resembles TM one class closely vertically to look the face of land information of obtaining, this mode is constrained many useful informations.Even the high-spectrum remote-sensing device that receives much concern, also can only have on some particular problems of distinguishing mark absorption bands, as: the leaf area index estimation, chlorophyll content, there is superiority aspects such as lithology identification, owing to there is following problem: (1) is subjected to environmental interference, high-spectral data " the different spectrum of jljl " and " with the spectrum foreign matter " phenomenon often to occur; (2) interference of atural object two tropism's reflection characteristics; (3) existence of mixed pixel does not also obtain fine solution from mechanism, so high-spectrum remote-sensing does not also reach people's expectation value in other applications.This shows, inquiring into the new method of obtaining face of land information from the interactional mechanism of light wave and atural object is the development trend of optical detection load research, it has been recognized that multi-angle remote sensing, the affiliation that adds of multipolarization data etc. makes relevant atural object, physics, how much, biological parameter is convenient to inverting.For example: (1) is in multi-angle remote sensing, obtain the spectral radiance and the polarization information of atural object by a plurality of angles, can set up the data inversion model of imperfect conforming layer and Lambert surface, the spectral signature that draws atural object is not only closely bound up with chemical property such as its composition, but also is closely connected with physical characteristicss such as the thick perceived noisiness in spatial geometric shape, surface of these atural objects itself, water cut.Compare with single direction remote sensing, what system obtained is not the optical information of two dimensional surface, but comprises the optical information of the actual three-dimensional structure information of atural object, therefore, not only can improve the precision of Physical Property Analysis, also can obtain the space structure of atural object.(2) polarization is an optics multipolarization information, and non-polarized light beam can produce partial poolarized light from smooth dielectric surface reflection, and heat radiation simultaneously also can produce certain polarization.Polarization information has reflected the texture of being visited atural object, structure, roughness, water cut, the physicochemical property of material, anisotropy etc., different objects polarization of reflected light degree is a sun altitude, view angle, the function of position angle and measurement wavelength, therefore, existing polarization is surveyed experiment and is shown, polarization is as the supplementary means of radiation detection, change by the clutter reflections polarization state, the information of target surface is enhanced, outstanding more details of target and phenomenon improve image contrast, survey object structures and texture information, improving accuracy of identification etc., is a kind of very potential method that improves the target detection ability.
Multiband, multi-angle, multipolarization remote sensing have development prospect in a lot of applications.(1) plant for example: utilize the high spectral information of multi-angle can survey leaf area index, chlorophyll content etc.; Comparison by parameters such as degree of polarization in the multi-angle polarization and polarization angle can obtain leaf surface and nexine information, moisture and growing way in the prediction leaf.(2) atmosphere: utilize multi-angle polarization spectrum information, atmospheric sounding and aerocolloidal thickness, particle scale, density, complex index of refraction, chemical constitution etc. effectively, distinguish ice cloud and water cloud effectively, to the foundation of aviation, meteorology, global atmosphere model and to improve the atmospheric correction precision of remotely-sensed data significant.(3) ocean: utilize polarization spectrum information, can survey chlorophyll concentration in the coastal zone, silt effectively, seashore height, sea surface wind are to, information such as air space above sea air regime.(4) mineral: high spectral information can carry out lithology identification effectively, at the further further investigation that awaits of the reflection of polarization feature of rock.(5) military target: because polarization information can be distinguished nature and man-made target well, therefore, spectrum polarizing information can improve the detectivity of military target greatly and disclose the ability of camouflage, also can play a great role aspect the effect assessment of battlefield.
Though at present the research of the detection means of multiband, multi-direction, multipolarization and mechanism of remote sensing also has a lot of problems to await further research and solves.As: multi-angle remote sensing is from multi-angle optical information inverting atural object structure, but still blank aspect the relational model of setting up atural object structure, optical information and sun altitude, observed azimuth, the present detection means that does not also have to provide simultaneously space structure, spectrum and polarization.In addition, the detection study of full polarization state was just risen during polarization was surveyed, polarization is surveyed the research of mechanism also can not satisfy actual needs far away, it is at the early-stage with the research of the detection instrument of full polarization state to survey high spectrum simultaneously, and the development of high resolving power, high-precision detection instrument is not also finished as yet.
Summary of the invention
Technology of the present invention is dealt with problems and is: overcome the deficiency that existing Detection Techniques majority can only be surveyed the simple target parameter, a kind of high spectrum full polarization three dimension imaging integrate detecting system that can realize the three dimensions of picture dot yardstick correspondence, high spectrum, the integrated measurement function of polarization is provided, this system can provide the three dimensions of target pixel yardstick correspondence, high spectrum, full polarization information, can improve the detectivity of system greatly.
Technical solution of the present invention: high spectrum full polarization three dimension imaging integrate detecting system, its characteristics are to comprise following parts:
Imaging lens is positioned at whole detection system foremost, is used for that measured target is imaged in focal plane array and lists;
Acousto-optic tunable filter plate AOTF is positioned at the back of linear phase delayer, is used for the spectrum beam split of detection system, links to each other with computing machine by control circuit;
Control circuit is used to change the frequency values of the signal that is added in acousto-optic tunable filter plate AOTF, thereby realizes the spectrum beam split function of AOTF, and one end and acousto-optic tunable filter plate AOTF join, and the other end links to each other with computer by serial or USB interface;
Linear phase delayer LCVR is positioned at the back of imaging lens, and the polarization function of linear phase delayer LCVR and acousto-optic tunable filter plate AOTF has constituted the polarimetry assembly of 4 full stokes component functions of detectable target;
Electronic controller is used to control the magnitude of voltage that is added in linear phase delayer LCVR, thereby changes the phase-delay value of LCVR, and an end and linear phase delayer LCVR join, and the other end links to each other with computer by serial or USB interface;
Focal plane arrays (FPA) is electrooptical device, is used for the light radiation intensity of measured target is converted to electric signal, and the electric signal of its output is sent into image pick-up card;
Image pick-up card is used for the signal after the focal plane arrays (FPA) opto-electronic conversion is sent into computing machine, and it is inserted in the PCI slot of calculating;
Based on the adaptive structure light projecting apparatus of acoustooptic deflector, be used for to several sinusoidal gratings of measured object surface projection, by the phase place and the frequency of sine streak that computer control is throwed;
Computing machine is the core component of whole remote sensing system, is used to control be added in the control signal frequency that AOTF goes up control signal, thereby changes the wavelength by the light of AOTF, obtains the image of target at this wavelength place, has realized the imaging spectral detecting function of system; Control simultaneously is added in the magnitude of voltage of LCVR, thereby changes the phase-delay value of LCVR; Control is throwed several sinusoidal gratings based on the adaptive structure light projecting apparatus of acoustooptic deflector to the measured object surface, by the phase place and the frequency of sine streak that computer control is throwed, realizes the measurement of Three-dimension Target pattern; Gather the measured target picture signal, and institute's images acquired is handled, realized polarimetry.
Described adaptive structure light projecting apparatus based on acoustooptic deflector is made up of acoustooptic deflector, modulated laser, drive signal circuit and optical system, drive signal circuit produces two paths of signals, one the road drives acoustooptic deflector, another road is used to drive modulated laser, produce the grid that reversed of stress distributes in the acoustooptic deflector, when modulating lasering beam passes through acoustooptic deflector with certain angle, outgoing beam produces diffraction, and the plano-convex lens of two bundle diffraction lights in optical system focuses on and produce the sinusoidal interference ripple.
Described linear phase delayer LCVR is by two glass plates making for borosilicate or fused silica material up and down, filling liquid crystal LC in the middle of two glass plates, and liquid crystal LC makes liquid crystal parallel with glass plate through the flour milling polyimide PI of interior surfaces of glass alignment.
Principle of work of the present invention is: the measurement of imaging spectral is: AOTF forms by piezoelectric transducer with along the double refraction single-shaft crystal of suitably direction cutting, frequency signal by control signal comes the drive pressure electric transducer to make to conduct ultrasound wave in the crystal, ultrasound wave makes the refractive index generating period variation of crystals, this ultrasound wave is formed the ultrasonic phase grating of row, have only the light wave of specific wavelength can satisfy specific momentum matching condition and diffraction takes place in the feasible light wave that incides in the birefringece crystal, change the frequency of control signal, AOTF can change the wavelength coverage of passing through rapidly, at extremely short time interscan overall optical spectral limit, thus the measurement of realization imaging spectral.The measuring method of target three-dimensional appearance: by throwing list structure light to target surface by the sine streak grenade instrumentation, then take via the structured light after the target surface reflection modulation by image capturing system, calculate the three-dimensional appearance of target surface by the phase information of this structured light, be added in the signal frequency that AOTF goes up control circuit by computer control, thereby change wavelength, obtain the image of target at this wavelength place by the light of AOTF.Order changes the control signal frequency, sequence is gathered the target at different wave length place, obtain as the data cube among Fig. 2, promptly get the spectral information of target, because the structured light of structured light grenade instrumentation projection adopts laser as light source, so structural light stripes is very narrow at the catoptrical line width on testee surface, is generally about 2nm.If its wavelength is 632.8nm, if the image of 632.8nm spectrum segment in the abstract image cube, so just can the modulation stripe image through the body surface reflection be extracted from data cube, handle computing through a series of images and obtain the Three-dimension Target pattern.Polarimetry is: the polarimetry assembly is made of a linear filtering sheet LP of voltage-controlled variable liquid crystal phase delay device LCVR and its back, the direction of adjusting LP allows horizontal polarization light pass through, length of delay by the computer control phase delay device, 4 groups of different phase-delay value images acquired are set obtain 4 image intensity value, obtain a system of linear equations, utilize inverse matrix to obtain 4 component I of full Stokes Stokes vector, Q, the value of U and V.
The present invention compared with prior art has following advantage:
(1) overcomes the deficiency that existing Detection Techniques majority can only be surveyed the simple target parameter, use same focal plane arrays (FPA) to gather Three-dimension Target space, high spectrum, full polarization information, the three dimensions of target pixel yardstick correspondence, high spectrum, full polarization information are provided, it is a rapid progress in remote sensing field, can improve the detectivity and the adaptive faculty of system greatly, effectively solve the contradiction that present remote sensing field data explosion and information are hungered and thirst.
(2) utilize acousto-optic tunable filter plate AOTF to realize spectrum beam split function, the polarization characteristic of phase delay device LCVR and AOTF is realized the polarimetry function of system, employing is throwed sine streak based on the adaptive structure light projecting apparatus of acoustooptic deflector to measured target, the whole detecting functions of system all use automatically controlled device, need not mechanical mobile device, improve the reliability and the life-span of system greatly;
(3) owing to full optical parameter such as the amplitude of utilizing light wave simultaneously, frequency, phase place, polarization, obtain the measured object multidimensional information, by information fusion, the in-depth mechanism of remote sensing is studied, and can improve the detectivity of system greatly.
Description of drawings
Fig. 1 is that system of the present invention forms structured flowchart;
Fig. 2 is the work synoptic diagram of acousto-optic tunable filter plate AOTF of the present invention;
Fig. 3 is wave vector of the present invention interaction principle figure in TeO2AOTF;
Fig. 4 is that AOTF wavelength of the present invention is selected schematic diagram;
Fig. 5 is the contrast figure of AOTF inner structure of the present invention and light vector and ultrasonic vector;
Fig. 6 is a measuring three-dimensional morphology principle schematic of the present invention;
Fig. 7 is the adaptive structure light projecting apparatus structural representation based on acoustooptic deflector of the present invention;
Fig. 8 is a linear phase retarder arrangement synoptic diagram of the present invention;
Fig. 9 is a measurement process flow diagram of the present invention.
Embodiment
As shown in Figure 1, the present invention is by imaging lens, adaptive sine streak grenade instrumentation, focal plane arrays (FPA), image pick-up card, acousto-optic tunable filter plate AOTF, control circuit, linear phase delayer LCVR, electronic controller, computing machine based on acoustooptic deflector are formed, imaging lens is positioned at whole remote sensing system foremost, is used for that measured target is imaged in focal plane array and lists; Adaptive sine streak grenade instrumentation based on acoustooptic deflector, be used for to several sine streaks of measured object surface projection, phase place and frequency by sine streak that computer control is throwed, linear phase delayer LCVR, be positioned at the back of imaging lens, the polarization function of linear phase delayer LCVR and acousto-optic tunable filter plate AOTF has constituted the polarimetry assembly of this remote sensing system, be connected with computing machine by electronic controller, acousto-optic tunable filter plate AOTF is positioned at the back of linear phase delayer LCVR, be used for spectrum beam split function, link to each other with computer by serial; Focal plane array is classified electrooptical device as, is used for the light radiation intensity of measured target is converted to electric signal, and the electric signal of its output is sent into image pick-up card; The signal of image pick-up card after with the focal plane arrays (FPA) opto-electronic conversion sent into computing machine, and it is inserted in the PCI slot of calculating; Electronic controller controls is added in the magnitude of voltage of linear phase delayer LCVR, thereby changes the phase-delay value of LCVR, and an end and linear phase delayer LCVR join, and the other end links to each other with computer by serial or USB interface; Computing machine is the core component of total system, is used to control be added in the control signal frequency that AOTF goes up control signal, thereby changes the wavelength by the light of AOTF, obtains the image of target at this wavelength place, has realized the imaging spectral detecting function of system; Control simultaneously is added in the magnitude of voltage of LCVR, thereby changes the phase-delay value of LCVR; Control is throwed several sinusoidal gratings based on the adaptive structure light projecting apparatus of acoustooptic deflector to the measured object surface, by the phase place and the frequency of sine streak that computer control is throwed, realizes the measurement of Three-dimension Target pattern; Gather the measured target picture signal, and institute's images acquired is handled, realized polarimetry.
Present widely used method is to use a plurality of detection systems to be placed on the detection of carrying out target on the platform, so also can realize obtaining of Three-dimension Target, spectrum and polarization information, but because be not to use same electrooptical device, these values need coupling, be difficult to each other be mapped, the present invention obtains when using same focal plane arrays (FPA) to realize Three-dimension Target, spectrum and polarization information, need not mate, just can realize three-dimensional, spectrum and the polarization information of object pixel level correspondence.
As shown in Figure 2, for the measurement of imaging spectral, the present invention uses beam splitter to be acousto-optic tunable filter plate AOTF 5, and the principle of work of AOTF is that light beam and ultrasound wave are interacted in transparent medium.AOTF forms by piezoelectric transducer with along the double refraction single-shaft crystal of suitably direction cutting.Come the drive pressure electric transducer to make by control signal and conduct ultrasound wave in the crystal.Ultrasound wave makes the refractive index generating period variation of crystals.This ultrasound wave is formed the ultrasonic phase grating of row, has only the light wave of specific wavelength can satisfy specific momentum matching condition and diffraction takes place in the feasible light wave that incides in the birefringece crystal.Can change the wavelength coverage of passing through rapidly by the frequency AOTF that changes control signal, at extremely short time interscan overall optical spectral limit.
This acousto-optic interaction not only just has the effect of the light of selecting single wavelength, and it has also changed the diffraction polarized state of light simultaneously.This uniaxial crystal makes the natural light of incident be divided into two bundles (o light and e light) as the AOTF crystal medium, their polarization direction quadrature, and velocity of propagation is different with direction.Figure 3 shows that a typical A OTF shop drawing, when a branch of natural light with incident angle θ
iBe directly incident in the crystal of AOTF, diffraction just may take place in the light that this light beam medium wavelength satisfies formula (1) condition.
Wherein
For being respectively diffraction light and incident light vector;
Be ultrasonic vector.
λ is an optical wavelength in the formula; F is a ultrasonic frequency; V is that sound wave is in intracrystalline velocity of propagation; n
i, n
dBe respectively the refractive index of incident light and diffraction light, they satisfy following relation:
TeO
2The wavelength vector ellipsoid of the birefringece crystal of AOTF, the incident light vector
At ultrasonic vector
Effect under, become the orthogonal o optical diffraction of polarization state light k
d oWith e optical diffraction light k
d eBlock e optical diffraction light k
d eThe small part light of diffraction does not take place, and then emergent light is and has the very linearly polarized light of narrow bandwidth.
The AOTF wavelength is selected principle as shown in Figure 4, and the light that contains different wave length is injected AOTF, when the ultrasound wave vector is k
a F1The time, the diffraction light vector that satisfies the momentum matching condition has only k
d λ 1, therefore just having only wavelength is λ
1Light pass AOTF, the rest may be inferred, when the ultrasound wave vector is k
a FnThe time, the diffraction light vector that satisfies the momentum matching condition has only k
d λ n, therefore also just having only wavelength is λ
nLight pass AOTF.Like this, AOTF has just played the effect of beam split filtering.
As shown in Figure 5, if light vector spirogram and ultrasonic polar plot and the non-AOTF of acoustic optic interaction in the same way structural drawing are put together, and corresponding equal angular, can intuitively obtain the principle of acousto-optic interaction, and the angle corresponding relation between each vector wherein.
In the AOTF structural drawing, adjusted the angle of exit plane especially, can make the light wave generation diffraction of different wave length like this after, though the angle of diffraction difference, the outgoing direction of light is identical.Thereby effectively reduced longitudinal aberration between the pairing image of different wave length.
From above principle analysis as can be seen, AOTF can finish the spectral information measurement function of system to target well as light-splitting device.
For measuring three-dimensional morphology, the present invention adopts the projection gate phase method to carry out Three-dimension Target and measures, as Fig. 6, the adaptive sine streak grenade instrumentation of acoustooptic deflector is projeced into body surface with striped light, form the striation 3-D view of being modulated by the testee surface configuration from the teeth outwards, this 3-D view is surveyed by the image capturing system that is in the another location, thereby obtain striation two dimension fault image, the distortion degree of striation depends on relative position and the body surface shape exterior feature (highly) between structured light projector and the image capturing system.On directly perceived, proportional along the displacement (or skew) that striation demonstrates with the body surface height, the variation on plane has been represented in kink, the discontinuous Surface Physical gap that shown, adaptive structure light projecting apparatus and one timing of the relative position between the image capturing system when acoustooptic deflector just can reappear body surface shape exterior feature by the optical strip image coordinate that distorts.The light intensity general type of deformed grating is:
I(x，y)＝γ(x，y){I
DC+I
mcos[Φ(x，y)]} (4)
Wherein (x y) is the reflection coefficient of projection light gate region to γ; I
DCDC component for the grating sine streak; I
mBe system contrast; (x y) is phase place to Φ, and it is target shape h (x, function y).Adopt three phase algorithm, make the three kind sinusoidal projection raster images of fringe phase φ, carry out phase place and resolve for { φ=0, φ=pi/2, φ=π }.(x y) can differ the gray-scale value I of the CCD picture point of pi/2 according to three width of cloth to phase place Φ
0, I
Pi/2, I
πDetermine that formula is as follows:
I
0＝γ(I
DC+I
msinΦ)
I
π/2＝γ(I
DC+I
mcosΦ) (5)
I
π＝γ(I
DC-I
msinΦ)
Obtain Φ (x, y) after because it is that (x, function y) according to the structural parameters of camera model that calibrates and sensor, just can calculate the three-dimensional coordinate of object table millet cake to target shape h.
As shown in Figure 7, based on the adaptive structure light projecting apparatus of acoustooptic deflector by acoustooptic deflector, modulated laser, drive signal circuit and optical system are formed, drive signal circuit produces two paths of signals, one the road drives acoustooptic deflector, another road is used to drive modulated laser, produce the grid that reversed of stress distributes in the acoustooptic deflector, when modulating lasering beam passes through acoustooptic deflector with certain angle, outgoing beam produces diffraction, the plano-convex lens of two bundle diffraction lights in optical system focuses on and produces the sinusoidal interference ripple, and the phase place of the sinusoidal interference striped that is produced is relevant with the frequency difference between two drive signals of acoustooptic deflector with the phase differential of acousto-optic drive signal by the laser modulation signal respectively with spacing.After laser beam entered acoustooptic deflector, mixed frequency signal was divided into two bundles with incident beam, and along with the increase of front-end driven signal, the angle of two light beams also becomes greatly, and the cycle of resulting interference fringe diminishes, and made that promptly striped attenuates, pitch smaller.When the front end drive signal reduces, the angle of two light beams diminishes, and resulting striped chap, spacing become big.There is phase differential between the control signal of modulated laser and the control signal of acoustooptic deflector, make the asynchronism(-nization) of the propagation of two light beams in acoustooptic deflector, produce constant phase differential, so just make two luminous points after lens converge produce constant phase differential, therefore the phase place of interference fringe just can change by the phase differential that changes control signal, the automatic control of drive signal be can realize, the phase place and the spacing variation of not moving any parts and finishing the projection striped reached.
For the measurement of polarization, polarimetry assembly of the present invention is made of the linear filtering face LP that two voltage-controlled variable liquid crystal phase delay device LCVR and AOTF itself are had, and the direction of adjusting AOTF only allows horizontal polarization light pass through.The stationary shaft direction of LCVR becomes an angle in 0 degree～180 degree scopes with the plane of polarization LP direction of AOTF.Signal to noise ratio (S/N ratio) harmony according to four measured stokes components of system can be optimized design to the angle of these three polarization directions, obtains optimum angle.
As shown in Figure 8, linear phase delayer LCVR is two glass plates that borosilicate or fused silica material are made by both sides up and down, the escapement that glass plate is separated from two ends separates, middle filling liquid crystal LC, liquid crystal LC makes liquid crystal parallel with glass plate through the flour milling polyimide PI of interior surfaces of glass alignment.The electronic controller of LCVR is the accurate stabilized voltage supply of high precision, and is identical with general voltage source principle.Employing Muller matrix operation characterizes the transmitted light by the plane of polarization LP of AOTF.The available Stokes vector S of light of coming out from LP
0=(LP) (VR) S
iRepresent, wherein S
i=(I, Q, U, V) represent (unknown) input Stokes vector by conventional symbols, that is I is the light intensity of polarized light not, Q is that horizontal linear polarization subtracts perpendicular linear polarization, U is that 45 ° of linear polarizations subtract 135 ° of linear polarizations, and V is the difference that right-hand circular polarization subtracts Left-hand circular polarization.
In order to find 4 components of input Stokes vector, 4 groups of different phase-delay value images acquired are set obtain 4 I
0Value obtains a system of linear equations, utilizes S
iInverting S
i=(B)
-1I
0Obtain four 4 components of incident light, wherein (B) row is corresponding to variable I in top each equation of 4 pairs of length of delays (δ, Δ), Q, the coefficient of U and V.
As shown in Figure 9, computing machine of the present invention to the collection and the data handling procedure of measured target is: the phase-delay value that LCVR at first is set all is 0 °, change the RF driving frequency of AOTF, make it begin progressively to scan up to finishing wavelength from initial wavelength location, therefrom extract in the data cube with based on the identical image of modulated laser wavelength in the adaptive structure light projecting apparatus of acoustooptic deflector, carry out obtaining Three-dimension Target information after a series of images data processing; Change the phase-delay value ° of LCVR then successively, the RF frequency that changes AOTF makes it in whole wavelength coverage interscan images acquired, obtains in the scape image arbitrary pixel at 4 I of each wavelength
0Value is separated the high spectrum Stokes of the target polarized component value that system of linear equations just can get 4 pixel yardstick correspondences, so just can obtain in the scape image the high spectrum of pixel yardstick correspondence on each pixel, polarization and three-dimensional spatial information entirely.
Claims (3)
1, high spectrum full polarization three dimension imaging integrate detecting system, its characteristics are to comprise as the lower part:
Imaging lens is positioned at whole detection system foremost, is used for that measured target is imaged in focal plane array and lists;
Acousto-optic tunable filter plate AOTF is positioned at the back of linear phase delayer, is used for the spectrum beam split of detection system, links to each other with computing machine by control circuit;
Control circuit is used to change the frequency values of the signal that is added in acousto-optic tunable filter plate AOTF, realizes the spectrum beam split function of AOTF, and one end and acousto-optic tunable filter plate AOTF join, and the other end links to each other with computer by serial or USB interface;
Linear phase delayer LCVR is positioned at the back of imaging lens, and the polarization function of linear phase delayer LCVR and acousto-optic tunable filter plate AOTF has constituted the polarimetry assembly of 4 full stokes component functions of detectable target;
Electronic controller is used to control the magnitude of voltage that is added in linear phase delayer LCVR, thereby changes the phase-delay value of LCVR, and an end and linear phase delayer LCVR join, and the other end links to each other with computer by serial or USB interface;
Focal plane arrays (FPA) is electrooptical device, is used for the light radiation intensity of measured target is converted to electric signal, and the electric signal of its output is sent into image pick-up card;
Image pick-up card is used for the signal after the focal plane arrays (FPA) opto-electronic conversion is sent into computing machine, and it is inserted in the PCI slot of calculating;
Based on the adaptive structure light projecting apparatus of acoustooptic deflector, be used for to several sinusoidal gratings of measured object surface projection, by the phase place and the frequency of sine streak that computer control is throwed;
Computing machine is the core component of whole remote sensing system, is used to control be added in the RF frequency that AOTF goes up control circuit, thereby changes the wavelength by the light of AOTF, obtains the image of target at this wavelength place; Be used to control the magnitude of voltage that is added in LCVR, thereby change the phase-delay value of LCVR; Gather the measured target picture signal, and institute's images acquired is handled.
2, high spectrum full polarization three dimension imaging integrate detecting system according to claim 1, it is characterized in that: described adaptive structure light projecting apparatus based on acoustooptic deflector is by acoustooptic deflector, modulated laser, drive signal circuit and optical system are formed, drive signal circuit produces two paths of signals, one the road drives acoustooptic deflector, another road is used to drive modulated laser, produce the grid that reversed of stress distributes in the acoustooptic deflector, when modulating lasering beam passes through acoustooptic deflector with certain angle, outgoing beam produces diffraction, and the plano-convex lens of two bundle diffraction lights in optical system focuses on and produce the sinusoidal interference ripple.
3, high spectrum full polarization three dimension imaging integrate detecting system according to claim 1 is characterized in that: the stationary shaft direction of described LCVR becomes an angle in 0 degree～180 degree scopes with the plane of polarization LP direction of AOTF.
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| CN1256408A (en) * | 1999-12-28 | 2000-06-14 | 中国科学院西安光学精密机械研究所 | Polarization-type interference imaging spectral technology and equipment |
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