EP2257832A1 - Caméra à ondes millimétriques avec une résolution améliorée par utilisation du principe sar en combinaison avec une optique de focalisation - Google Patents

Caméra à ondes millimétriques avec une résolution améliorée par utilisation du principe sar en combinaison avec une optique de focalisation

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Publication number
EP2257832A1
EP2257832A1 EP09714397A EP09714397A EP2257832A1 EP 2257832 A1 EP2257832 A1 EP 2257832A1 EP 09714397 A EP09714397 A EP 09714397A EP 09714397 A EP09714397 A EP 09714397A EP 2257832 A1 EP2257832 A1 EP 2257832A1
Authority
EP
European Patent Office
Prior art keywords
receivers
imaging
radiation
line
electromagnetic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP09714397A
Other languages
German (de)
English (en)
Inventor
Torsten LÖFFLER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Synview GmbH
Original Assignee
Synview GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Synview GmbH filed Critical Synview GmbH
Publication of EP2257832A1 publication Critical patent/EP2257832A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/003—Bistatic radar systems; Multistatic radar systems
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/88—Radar or analogous systems specially adapted for specific applications
    • G01S13/887—Radar or analogous systems specially adapted for specific applications for detection of concealed objects, e.g. contraband or weapons
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/88—Radar or analogous systems specially adapted for specific applications
    • G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/88—Radar or analogous systems specially adapted for specific applications
    • G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
    • G01S13/90—Radar or analogous systems specially adapted for specific applications for mapping or imaging using synthetic aperture techniques, e.g. synthetic aperture radar [SAR] techniques
    • G01S13/904—SAR modes
    • G01S13/9082—Rotating SAR [ROSAR]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
    • H01Q21/08—Arrays of individually energised antenna units similarly polarised and spaced apart the units being spaced along or adjacent to a rectilinear path

Definitions

  • the present invention relates to an apparatus and a method for imaging an object by means of ultra-high frequency electromagnetic radiation.
  • the terahertz frequency range is one of the last "dark" frequency ranges of the electromagnetic spectrum, ie radiation sources and receivers are so far difficult to obtain for this frequency range, so far the applications of electromagnetic radiation in this frequency range are limited to research-related fields, such as For example, radio astronomy or material sciences, the THz frequency range offers considerable advantages over other frequency ranges of the electromagnetic spectrum:
  • THz radiation is non-ionizing and therefore considered safe in the biomedical field.
  • THz radiation provides essential information about charge carrier dynamics, especially in nanostructures, which play an essential role in future photonic and electronic components.
  • THz radiation shows a low scattering compared to optical frequencies and is therefore particularly suitable for use in industrial environments in which, for example, more dust is generated.
  • the THz frequency range for imaging applications in particular in medical technology and in security technology, for example, for people control, has been trying to make accessible. Frequently, methods of so-called synthetic imaging are used.
  • the principle of synthetic imaging which is often referred to as synthetic aperture imaging, is to take the snapshot of an antenna or large aperture lens through a plurality of temporally successive shots of a moving one - -
  • the best-known synthetic imaging system is the so-called Synthetic Aperture Radar (SAR for short).
  • SAR Synthetic Aperture Radar
  • the transmitting and the receiving antenna of a radar system which is for example mounted on an aircraft, moved past an object. In the course of this movement, the object is illuminated under a variable angle and recorded accordingly.
  • the aperture of a large antenna can be synthesized from the intensity and phase position of the ultra-high frequency signal emitted by the transmitting antenna and reflected by the object back into the receiving antenna, thus achieving high spatial resolution in the direction of movement of the antenna ,
  • a separate synthetic antenna is calculated for each location illuminated by the transmitting antenna in the course of the flyby, whose angular resolution in azimuth is chosen such that the geometric resolution in the direction of flight or movement is the same for all the distances considered ,
  • systems which, instead of a single pair of transmitting and receiving antennas, which are in motion relative to the object, use a plurality of transmitting and receiving antennas, which image the object at different angles and whose signals are evaluated according to the SAR principle.
  • either the transmission antennas themselves or separate reception antennas can be used to receive the waves reflected by or transmitted through an object.
  • the signal radiated by a single transmitting antenna is received by a plurality of receiving antennas.
  • the system known from WO 2006/036454 A2 uses a line-like arrangement of transmitters and receivers, wherein to scan a three-dimensional object it is rotated on a motor-driven platform in front of the transmitter or receiver line. In this way, the surface of a three-dimensional object is completely scanned during the measurement, as happens in a conventional aircraft-mounted SAR system by the flyby of the aircraft over the earth's surface.
  • the transmitter or receiver line is rotated around the object so as to enable fully synthetic detection of the object.
  • Still other systems use two-dimensional arrangements of transmitters and receivers in the manner of an array in order to achieve a fully synthetic imaging of a three-dimensional object.
  • Such systems require a large number of transmitters and receivers in both dimensions to provide sufficient resolution.
  • the present invention has the object to provide an apparatus and a method for imaging an object using electromagnetic ultra-high frequency radiation, which make it possible to achieve the highest possible resolution with the lowest possible number of transmitters and receivers and optionally a rotation of the object to be imaged to avoid.
  • an apparatus for imaging an object by means of high frequency electromagnetic radiation having at least two receivers for the high frequency radiation, the receivers being arranged to form a row, having a control arranged such that the receivers are operable to produce a synthetic aperture image in a direction parallel to the line, and having imaging optics arranged to provide optical imaging only in planes substantially perpendicular to the line.
  • the device according to the invention represents a hybrid system which effects a conventional optical imaging with the aid of an imaging optic in a first direction or dimension, while in a second direction or dimension perpendicular thereto the advantages of a synthetic aperture imaging are available.
  • ultra-high frequency radiation is electromagnetic radiation in a frequency range from 800 MHz to 10 THz, ie in an extended THz frequency range.
  • the frequencies used for the mapping are in a range of 30 GHz to 1 THz, and more preferably about 100 GHz. At these frequencies, there are large differences in the reflection or transmission behavior of different - -
  • Metal for example the surface of a firing or stabbing weapon
  • biological material for example the skin surface of the weapon carrier
  • the device according to the invention comprises at least a first and a second source of electromagnetic radiation of the highest frequency, which together with the receivers are arranged so as to form a row of radiation sources and receivers.
  • the illumination of the object with the radiation emitted by the radiation sources takes place in one embodiment with the same imaging optics, which serves to image the radiation onto the receivers.
  • the device according to the invention is not limited to two radiation sources or receivers, but in embodiments has more than two transmitters and / or receivers.
  • a line in the sense of the present invention is understood to mean an arrangement of the radiation sources and / or receivers in which the radiation sources and / or receivers are arranged along a straight line. This means that the arrangement of radiation sources and / or receivers has a greater extent in one direction than in the direction perpendicular thereto. However, a line within the meaning of the present invention does not exclude that each column of the row has more than one radiation source or one receiver. That Also, for example, arrangements of 2 x 4 or 4 x 20 radiation sources or receivers are considered as a row, as long as the arrangements in one direction have a greater extent than in the direction perpendicular thereto.
  • the imaging optics are arranged to effect optical imaging only in planes substantially perpendicular to the line, this means that, for example, beams impinging in parallel on the imaging optics only be deflected in planes perpendicular to the line so that they are focused on a line behind the imaging optics.
  • the first radiation source is adapted to radiate a first uniquely identifiable electromagnetic signal
  • the second radiation source is arranged to radiate a second uniquely identifiable electromagnetic signal
  • the two receivers being arranged to substantially each of them simultaneously receiving the first and second signals.
  • the electromagnetic signals radiated from the individual radiation sources are uniquely coded using the frequency of the radiated signals, i. they are distinguished by their frequency. Since in one embodiment there are no two radiation sources of identical frequency of the respective radiated electromagnetic signal, each signal received by a receiver can be unambiguously assigned to a single radiation source.
  • each of the receivers receives the first signal and the second signal simultaneously, a large aperture in the direction of the line of radiation sources and / or receivers can be synthesized from the received signals in a short time, and a cell-shaped image with high resolution can be calculated.
  • the frequency of the electromagnetic signals is understood to mean their carrier frequency and not their modulation frequency.
  • the unambiguous identifiability of the electromagnetic signals emitted by the individual radiation sources can also be achieved by a unique channel coding at the same carrier frequency, as is known from mobile communications and communications technology.
  • the first and the second receiver are coupled in a phase-locked manner, regardless of whether the radiation sources and the receivers are coupled in a phase-locked manner or not.
  • the detection of the electromagnetic signals can be carried out interferometrically using interferometric algorithms which take into account the phase differences of the electromagnetic signals between the individual receivers.
  • the first and second receivers are phase locked to the radiation sources.
  • the device according to the invention is suitable in particular for the emission and the reception of an electromagnetic continuous wave signal (CW signal).
  • CW signal electromagnetic continuous wave signal
  • the frequency of the radiated continuous wave electromagnetic signals may be kept constant over the measurement time.
  • the frequency of the signals may be varied over the measurement time, provided that at any time two signals have the same frequency or the same uniquely identifiable signature to unambiguously associate the individual signals received by the receivers over the entire measurement time to allow for the respective radiation sources.
  • the emission of the first and second signals is substantially simultaneous. Due to the unambiguous identifiability of the electromagnetic signals emitted by the individual radiation sources, despite simultaneous emission of the signals, these signals can be unambiguously assigned to the emitting radiation sources.
  • the calculation of the cellular image in the direction of the cell arrangement of radiation sources and / or receivers is carried out with the aid of algorithms as typically used for synthetic aperture imaging methods or for interferometric radar imaging or interferometric radio astronomy.
  • the signals from a single radiation source received simultaneously by at least two receivers are processed into a first synthetic image of a single virtual antenna having a large synthetic aperture. This generation of a synthetic image is then carried out simultaneously for all signals that are emitted by the other radiation sources.
  • the disclosure of DE 10 2007 045 103 is incorporated herein by reference with its entire disclosure content.
  • the imaging optic has a cylindrical optic.
  • Such cylinder optics are astigmatic in the ideal sense, ie they produce optical images only in planes perpendicular to their cylinder axis. Such cylindrical optics are therefore suitable for use in - -
  • cylindrical optics are understood to be optics whose refractive interfaces or reflective surfaces are formed by the outer surface of a cylinder or the inner surface of a hollow cylinder or of a surface segment thereof.
  • the basic bodies for these cylindrical optics are preferably straight cylinders,
  • the row of radiation sources and / or receivers is arranged in a first focal point of a hollow-cylindrical optic.
  • the hollow-cylindrical optic has an elliptical inner cross-sectional area which defines the course of the reflective inner surface of the body, then the cylinder optic has two focal points. If one arranges the cylindrical line of radiation sources and / or receivers in the first focal point, so
  • the electromagnetic radiation emitted by the radiation sources is focused by the elliptical mirror on a line on the object. While the resolution of this imaging system in the direction perpendicular to the array of the line is achieved by the imaging itself, a synthetic aperture becomes parallel to the line in one direction
  • the imaging optics in embodiments of the invention may also be formed by cylindrical telescopes, for example cylindrical Cassegrain telescopes, Newton telescopes, Schmidt telescopes or hybrids thereof.
  • the cylindrical optics is one to the cylinder axis, i. also to the line of radiation sources and / or receivers, parallel axis pivoted. In this way, an object can be scanned or scanned in a direction perpendicular to the line.
  • the cylindrical optics is pivoted about an axis parallel to the cylinder axis, but also the line of radiation sources and / or - -
  • the pivot axis is preferably located on the axis, which is formed by the row of radiation sources and / or receivers.
  • the focal line of the imaging optics in embodiments of the invention also be carried out by a translational movement of one or more elements of the device.
  • the line of radiation sources and / or receivers, the cylindrical optics, the primary mirror or primary mirror may be translated relative to each other in a direction perpendicular to the direction of the line of radiation sources and / or receivers.
  • the cylindrical optics preferably a cylindrical concave mirror
  • that basic surface is meant which defines the shape of the inner surface of the concave mirror.
  • An embodiment of the invention has an arrangement in which the hollow cylindrical mirror forms a primary mirror of the imaging optics, and the imaging optics additionally has a secondary mirror.
  • the secondary mirror is arranged in one embodiment in the first focal point of the hollow cylindrical optics.
  • the hollow cylindrical primary mirror At the vertex of the hollow cylindrical primary mirror emitted electromagnetic radiation first strikes the secondary mirror, is reflected from there to the hollow cylindrical primary mirror and is subsequently focused by the hollow cylindrical primary mirror in one dimension on the object.
  • the secondary mirror is pivotable about an axis substantially parallel to the cylinder axis of the hollow cylindrical primary mirror, so that the focal line generated by the primary mirror can be moved in a direction perpendicular to the cylinder axis, which it makes it possible to scan an object in this direction and create a complete image of its surface. It points
  • the imaging optics in one embodiment, a plurality of secondary mirrors, which are preferably formed by the lateral surfaces of a prismatic body.
  • a plurality of secondary mirrors can cause a high sampling rate in a direction perpendicular to the cylinder axis upon rotation of the plurality of secondary mirrors about an axis parallel to the cylinder axis.
  • the secondary mirror in embodiments of the present invention need not have a flat surface, but this may also be curved. - -
  • a movement of the imaging optics is dispensed with and instead an object moves past the measuring system.
  • the object can be moved linearly by means of a conveyor belt or rotated by means of a turntable.
  • the person to be checked moves independently past the measuring system or turns independently in front of the measuring system, whereby actively moving elements of the measuring system can be dispensed with.
  • the device according to the invention has a device for changing the focal length of the imaging optics.
  • a device for changing the focal length of the imaging optics makes it possible to achieve sharp images of a three-dimensional object even with an imaging optics with a shallow depth of field.
  • the means for changing the focal length of the imaging optic 15 includes elements that effect a change in at least one distance between the elements of the device.
  • Such an element is, for example, a linear adjuster, which makes it possible to move one component of the device driven by a motor relative to another.
  • the distance between the row of radiation sources and / or receivers and the secondary mirror or the primary mirror or the distance between the primary mirror and the -0 secondary mirror can be changed to achieve a change in the focal length.
  • the means for changing the focal length of the imaging optics is formed by a plurality of secondary mirrors which are rotatable about a rotation axis and which are set up such that the distances of the secondary mirrors from the axis of rotation are different.
  • the focal length of the imaging optics can be scanned in discrete steps and a sharp image of the object over a depth substantially equal to the difference between the distances of the secondary mirror closest to the axis of rotation and the farthest from the axis of rotation secondary mirror
  • the secondary mirrors have different radii of curvature, so that they have a different focal length, which affects the total focal length of the imaging optics.
  • FIG. 1 shows a three-dimensional view of a first embodiment of the device according to the invention.
  • FIG. 2 schematically shows the structure and the wiring of radiation sources and receivers according to an embodiment of the invention.
  • FIG. 3 shows a three-dimensional view of an alternative embodiment of the device according to the invention.
  • FIG. 1 shows a first embodiment of the device according to the invention with a line-shaped arrangement 1 of a plurality of radiation sources 1 10 and receivers 111 and a
  • the reflecting inner surface of the concave mirror 2 is defined by an ellipse which lies in a plane which is perpendicular to the direction of the line 1.
  • the line-shaped arrangement 1 has radiation sources 110 and receiver 111 arranged next to one another in an irregular sequence. In the illustrated embodiment, the row has five radiation sources 110 and one receiver 11 each. This results in a large number of intervals between
  • the vertical, line-shaped array of radiation sources 110 and receivers 11 1 is arranged in a first focal point of the elliptical hollow cylindrical mirror 2. In vertical,
  • the mirror 2 is not curved, so that only a astigmatic image in a plane perpendicular to the line 1 is effected as in a cylindrical lens.
  • the hollow cylindrical mirror 2 could be replaced by a cylindrical lens. Whereby the object would be to be arranged 35 behind the lens as seen from the line 1.
  • the object to be imaged is arranged approximately in the second focal point of the concave mirror.
  • the position of the object is indicated in Figure 1 by the object plane 4. All objects located in object level 4 - ⁇
  • the arrangement of the line 1 and the concave mirror 2 about an axis of rotation 3 is pivotable. In this way, by pivoting the arrangement of line 1 and concave mirror 2, the focal line in the object plane 4 in the horizontal direction 5 can be given away. Thus, the entire object arranged in the object plane 4 can be scanned. .5
  • Line 1 has five transmitters or radiation sources 110 and receiver 11 1 each. Only four radiation sources 110 and receiver 111 are explicitly shown in the schematic representation, while the analogous continuation of the system with another 30 radiation sources and receivers is indicated by black dots.
  • an object 108 is disposed between the radiation sources 110 and receivers 111 so that depending on the position of the object 108 with respect to the radiation sources 110 and receiver 111 from the receivers 11 1 transmitted through the object 108 or from the Object 108 reflected radiation is detected.
  • the system has a computer 109. - -
  • Each radiation source 110 has a signal generator 102 for generating a transmitter intermediate frequency signal 112 as well as a mixer 103 and a transmitting antenna 104. Moreover, each radiation source 110 is connected to a signal generator 101 for generating a radio frequency signal 113 at a frequency of 30 GHz. The mixers 103 of each radiation source 110 serve to mix the radio frequency signal 113 with a corresponding transmitter intermediate frequency signal 112. The mixed signal generated thereby is radiated by means of the transmitting antenna 104 from the radiation source 1 10.
  • the mixers 103 are so-called single sideband mixers which generate a signal containing only the sum frequency of the frequency of the radio frequency signal 113 and the transmitter intermediate frequency signal 112.
  • Each of the intermediate signals 112a, 112b, 112c, 112d, ... generated by the signal generators 102 of the radiation sources 110 has a frequency different from the other intermediate frequencies.
  • the first intermediate frequency 112a is 2 MHz
  • the second intermediate frequency 112b is 4 MHz
  • 112c is 6 MHz
  • the fourth intermediate frequency 112d is 8 MHz, etc. Since the mixers 103 of the radiation sources 110 generate only the sum signal from the radio frequency signal 113 and the transmitter intermediate frequency signals 112 , the electromagnetic signals radiated by the antennas 104, which illuminate the object 108, also have the same frequency spacings
  • the single-sideband mixers 103 each generate only the difference signal between the radio frequency signal 113 and the corresponding transmitter intermediate frequency signals 1 12. It is only important that the mixers 103 do not generate two .5 identical or overlapping frequencies and a unique assignment of the radiation sources 1 10 emitted electromagnetic signals to the individual radiation sources 110 remains guaranteed.
  • two adjacent mixers 30, 103 are supplied with the signal of a single intermediate frequency generator 102, the first mixer 103 being a sideband mixer which generates only the difference frequency from the radio frequency signal 13 and the transmitter intermediate frequency signal, while the second mixer 103 is a single sideband mixer which generates only the sum frequency from the radio frequency signal and the transmitter intermediate frequency signal.
  • the antenna 103 of a first radiation source 110 could be directly fed with the radio frequency signal 113, while all other radiated signals are generated by mixing processes, as in this case as well, a unique assignability of the signals to the radiation sources 110 over the frequency of radiated electromagnetic signals is possible.
  • the intermediate frequency signals 1 12 generated by the signal generators 102 are detected by the computer 109, in order subsequently to enable an association of the individual received signals to the sources 1 10 during the detection.
  • the signal outputs of the generators 102 5 are connected to the computer 109.
  • the receivers 1 11 likewise shown in FIG. 2 have a construction similar to the radiation sources 110.
  • Each of the receivers 11 1 consists of a receiving antenna 105 and a mixer 106.
  • the mixers 106 of the receivers 11 1 are respectively connected to the corresponding receiving antennas 105 and to the signal generator 101.
  • the mixers 106 of the receivers 11 1 are single-sideband mixers which form intermediate frequency signals having the difference frequency between the radio frequency signal 1 13 and the signals received by the receiving antennas 105.
  • Each of the receivers 11 1 has a detection bandwidth which corresponds to the maximum frequency spacing of two transmitter intermediate frequency signals of the generators 102. Since each of the receiving antennas 105 receives all the signals radiated from the radiation sources 110 and these signals are mixed by the mixers 106 with the radio frequency signal 113, the receiver intermediate frequency signals 107a, 107b, 107c, 107d, ... of all the receivers 11 contain 1 signal components
  • Each signal output 107a, 107b, 107c, 107d, ... thus contains a set of intermediate frequency signals which can be uniquely assigned to one of the radiation sources 110.
  • the receiver intermediate frequency signals 107a, 107b, 107c, 107d,... are connected to the computer 109. This has for each receiver 1 11 a corresponding demultiplexer, which makes it possible to decompose and evaluate each set of receiver intermediate signals, as generated by the respective receiver 111, in its spectral frequency components.
  • FIG. 3 shows an alternative embodiment to the arrangement from FIG. 1.
  • the arrangement from FIG. 3 has an elliptical hollow cylindrical mirror 2 ', which together with a plurality of mirrors T forms an arrangement of primary mirror 2' and secondary mirror T.
  • the line 1 'of radiation sources and receivers is at the apex of the hollow cylindrical mirror 2', i. at the point of greatest distance from the first focus of the elliptical mirror.
  • the axis of the line V is aligned parallel to the cylinder axis of the mirror 2 '.
  • the secondary mirrors T form the side surfaces of a prismatic body.
  • This prismatic body is arranged rotatably about a rotation axis 3 ', wherein the rotation of the plurality of secondary mirrors T in FIG. 3 replaces the pivotal movement of the entire arrangement of line 1 and mirror 2 of FIG.
  • the rotational movement of the plurality of secondary mirrors 7 'about the axis of rotation 3' causes a pivoting of the focal line in the object plane
  • the scanning speed with which the focal line scans the body located in the object plane 4 ' can be increased.
  • FIGS. 4a) to f) show different arrangements with a row 1, 1 'of radiation sources and receivers, hollow mirrors 2, 2' and in the embodiments of FIGS. 4c) to f) additional secondary mirrors.
  • FIGS. 4a) to f) differ from each other and partly also from the arrangements of FIGS. 1 and 3, the elements are denoted by identical reference numerals.
  • FIG. 4a shows a plan view from above of the arrangement shown in FIG. 1 in a three-dimensional view. It can clearly be seen how a rotation of the line 1 and of the elliptical cylinder mirror 2 about the rotation axis 3 effects a displacement of the focal line in a direction 5.
  • Figure 4b shows an alternative embodiment in which the pivoting of the array of mirror 2 and line 1 is accomplished by a lateral, i. to the direction of line 1 vertical shift of line 1 is replaced.
  • a displacement also causes a lateral displacement of the focal line in the object plane and thus enables a rasterization of the object in one direction.
  • Figures 4c) to 4f) show arrangements in which the imaging optics forms a telescope with a primary mirror 2 'and a secondary mirror T. Both the primary mirror 2 'and the - -
  • Secondary mirrors T are cylindrical optics, each with curved surfaces in one direction.
  • the line 1 'of radiation sources and receivers is arranged in each case near the focal point of the telescope.
  • the line 1 'of radiation sources and receivers is reciprocated in a translational movement parallel to the direction 5', in order to bring about a lateral displacement of the focal line in the object plane.
  • the secondary mirror 7 ' is displaced in the direction 5' so as to bring about a lateral movement of the focal line via the object in the direction 5 '.
  • Figure 4f shows one of the embodiment shown in Figure 3 similar arrangement in which a plurality of secondary mirrors 7 'are rotated about a rotation axis 3', so that the object can be scanned at a high frequency.
  • Figure 4f shows one of the embodiment shown in Figure 3 similar arrangement in which a plurality of secondary mirrors 7 'are rotated about a rotation axis 3', so that the object can be scanned at a high frequency.
  • the secondary mirror T in the arrangement of Figure 4f) curved surfaces.
  • the individual secondary mirrors T have mutually different distances from the axis of rotation 3 '. In this way, the focal length of the telescope from the primary mirror 2 'and the secondary mirrors 7' changes during a revolution of the prismatic body about the axis of rotation 3 'in discrete steps, so that an artificial enlargement of the depth of focus is achieved because the

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  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

La présente invention porte sur un dispositif et un procédé pour former l'image d'un objet à l'aide d'un rayonnement haute fréquence électromagnétique. De l'état de la technique, on connaît des systèmes et des procédés pour former des images à synthèse d'ouverture, lesquels distinguent les signaux rayonnés par les différentes antennes émettrices après leur réflexion sur un objet lors de la réception par une pluralité de récepteurs. A cette occasion, on connaît des systèmes qui utilisent pour cela une disposition en ligne d'émetteurs et de récepteurs, un objet est amené à tourner devant la ligne d'émetteurs ou de récepteurs sur une plateforme entraînée par un moteur. La présente invention vise à mettre à disposition un dispositif et un procédé pour la formation d'une image d'un objet, lesquels permettent d'obtenir une résolution la plus élevée possible avec un nombre le plus bas possible d'émetteurs et de récepteurs. A cet effet, il est proposé, conformément à la présente invention, un dispositif pour la formation d'image d'un objet à l'aide d'un rayonnement haute fréquence électromagnétique avec au moins deux récepteurs pour le rayonnement haute fréquence, les récepteurs étant disposés en forme cellulaire, avec une commande qui entraîne les récepteurs de telle sorte qu'ils produisent, dans une direction parallèle aux lignes, une formation d'image avec une synthèse d'ouverture, et avec une optique de formation d'image, laquelle est dirigée de telle sorte qu'elle effectue une formation d'image optique seulement dans les plans sensiblement perpendiculaires aux lignes.
EP09714397A 2008-02-27 2009-02-11 Caméra à ondes millimétriques avec une résolution améliorée par utilisation du principe sar en combinaison avec une optique de focalisation Withdrawn EP2257832A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008011350A DE102008011350A1 (de) 2008-02-27 2008-02-27 Vorrichtung und Verfahren zur Echtzeiterfassung von elektromagnetischer THz-Strahlung
PCT/EP2009/051538 WO2009106424A1 (fr) 2008-02-27 2009-02-11 Caméra à ondes millimétriques avec une résolution améliorée par utilisation du principe sar en combinaison avec une optique de focalisation

Publications (1)

Publication Number Publication Date
EP2257832A1 true EP2257832A1 (fr) 2010-12-08

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