WO2020139215A1 - Passive mmw/thz imaging system for remote detection of concealed objects under the clothes on humans - Google Patents

Passive mmw/thz imaging system for remote detection of concealed objects under the clothes on humans Download PDF

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Publication number
WO2020139215A1
WO2020139215A1 PCT/TR2019/050064 TR2019050064W WO2020139215A1 WO 2020139215 A1 WO2020139215 A1 WO 2020139215A1 TR 2019050064 W TR2019050064 W TR 2019050064W WO 2020139215 A1 WO2020139215 A1 WO 2020139215A1
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WO
WIPO (PCT)
Prior art keywords
antenna
clothes
humans
objects under
concealed objects
Prior art date
Application number
PCT/TR2019/050064
Other languages
French (fr)
Inventor
Ahmet UNAL
Original Assignee
Orta Dogu Teknik Universitesi
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 Orta Dogu Teknik Universitesi filed Critical Orta Dogu Teknik Universitesi
Publication of WO2020139215A1 publication Critical patent/WO2020139215A1/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V8/00—Prospecting or detecting by optical means
    • G01V8/005—Prospecting or detecting by optical means operating with millimetre waves, e.g. measuring the black losey radiation
    • 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
    • G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
    • G01S3/02—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using radio waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V8/00—Prospecting or detecting by optical means

Definitions

  • the present invention generally relates to detection of concealed objects under the clothes of humans using passive MMW (millimeter wave) and THz (terahertz) imaging technique with variable focal length feature.
  • the invention of the Chinese Utility Model CN204156099(U) is a reflective antenna of an imaging system that can be used in millimeter wave and terahertz bands.
  • a mechanism for performing the step-by-step variable focal length feature in other words, the function of the zoom lens.
  • this mechanism does not offer a reliable performance in imaging the concealed objects.
  • the systems using active MMW/THz at low power levels are harmful to human health and they do not offer a reliable performance at long distances.
  • the systems using X-Ray are also harmful to human health, especially for children and pregnant women.
  • the aim of the present invention is to use passive millimeter wave/terahertz imaging with variable focal length configuration for detecting the concealed objects under the humans’ clothes.
  • Existing products and studies do not use the variable focal length feature. These systems can operate at different distances but do not offer resolution improvement according to distance.
  • I t is an innovation of the invention that the zoom lens function in optical cameras is adapted to the millimeter wave and terahertz bands. Thus, resolution improvements can be made at different distances when using the system. As a result, concealed objects under the clothes of humans who are approaching from long distances can be visualized. Due to this feature, it provides a significant advantage over other systems.
  • the conventional Cassegrain telescope optical assembly is adapted to millimeter wave and terahertz bands.
  • a fixed-focus system reduces resolution.
  • the reduced resolution is increased by the variable focal length while providing mobility between the optical elements.
  • long distance imaging property is added using optical system with variable focal length at millimeter wave and terahertz bands.
  • variable-focal length property subjected to this invention is to improve the resolution while taking images at different distances. I n this way, objects that are hidden under the human clothes at different distances can be displayed. This feature is not available in the current imaging systems used for this purpose.
  • FI G. 1 is an illustration of a block diagram of the system’s components.
  • the scene/ object (7) is the thing that is desired to be detected.
  • the primary mirror(2) is used to collect the electromagnetic wave radiation in millimeter wave and terahertz bands.
  • the secondary mirror(1 ) is used to focus this electromagnetic wave on the antenna(4) .
  • the central aperture(3) on the primary mirror is used to collect electromagnetic wave reflected from the secondary mirror(1 ) on the antenna(4) .
  • the antenna(4) converts the electromagnetic wave radiation in the millimeter wave and terahertz bands to electrical current and receiver(5) is used to convert the millimeter waves and terahertz to voltage. This is standard working principle of a scanning system .
  • the antenna(4) and the secondary mirror(1 ) can be fixed and the primary mirror(2) can be moved towards the secondary mirror(1 ) .
  • the distance between the secondary mirror(1 ) and the antenna(4) may be fixed, then fixing the primary mirror’s(2) position, secondary mirror(1 ) and the antenna(4) can be moved as they have a constant distance between them.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geophysics (AREA)
  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Aerials With Secondary Devices (AREA)

Abstract

The present invention generally relates to detection of concealed objects under the clothes of humans using passive MMW/THz imaging technique with variable focal length configuration.

Description

PASSI VE MMW/ THZ I MAGI NG SYSTEM FOR REMOTE DETECTI ON OF CONCEALED OBJECTS UNDER THE CLOTHES ON HUMANS
Related Field of the I nvention
The present invention generally relates to detection of concealed objects under the clothes of humans using passive MMW (millimeter wave) and THz (terahertz) imaging technique with variable focal length feature.
Background of the I nvention ( Prior Art)
I n the state of the art, there are imaging systems used in millimeter wave and terahertz bands can operate at different distances, and these systems cannot offer resolution improvement at different distances with the zoom function or, in other words, with variable focal length feature.
Exemplary inventions for such systems are disclosed in US patent 6746642 (B2) to Chinese patents CN101788665 (B) and CN102809745 (B) .
The invention of the Chinese Utility Model CN204156099(U) is a reflective antenna of an imaging system that can be used in millimeter wave and terahertz bands. On the said reflective antenna, there is provided a mechanism for performing the step-by-step variable focal length feature, in other words, the function of the zoom lens. However, this mechanism does not offer a reliable performance in imaging the concealed objects.
The systems using active MMW/THz at low power levels are harmful to human health and they do not offer a reliable performance at long distances. On the other hand, the systems using X-Ray are also harmful to human health, especially for children and pregnant women.
Brief Description of the I nvention
The aim of the present invention is to use passive millimeter wave/terahertz imaging with variable focal length configuration for detecting the concealed objects under the humans’ clothes. Existing products and studies do not use the variable focal length feature. These systems can operate at different distances but do not offer resolution improvement according to distance. I t is an innovation of the invention that the zoom lens function in optical cameras is adapted to the millimeter wave and terahertz bands. Thus, resolution improvements can be made at different distances when using the system. As a result, concealed objects under the clothes of humans who are approaching from long distances can be visualized. Due to this feature, it provides a significant advantage over other systems.
Since the system consists of known standard elements, it provides cost advantage. I n this invention, the conventional Cassegrain telescope optical assembly is adapted to millimeter wave and terahertz bands. When the distance increases, a fixed-focus system reduces resolution. The reduced resolution is increased by the variable focal length while providing mobility between the optical elements. With the increasing resolution, long distance imaging property is added using optical system with variable focal length at millimeter wave and terahertz bands.
The variable-focal length property subjected to this invention is to improve the resolution while taking images at different distances. I n this way, objects that are hidden under the human clothes at different distances can be displayed. This feature is not available in the current imaging systems used for this purpose.
Definition of The Figures
FI G. 1 . is an illustration of a block diagram of the system’s components.
Description of The Components And Parts Of The I nvention
The components shown in the figures prepared for a better explanation of the is numbered separately and explanation of each number is given below.
1 . Secondary mirror
2. Primary mirror
3. Central aperture of primary mirror
4. Antenna
5. Receiver
6. Pan-Tilt
7. Scene/ Object Detailed Description of The I nvention
The scene/ object (7) is the thing that is desired to be detected. The primary mirror(2) is used to collect the electromagnetic wave radiation in millimeter wave and terahertz bands. The secondary mirror(1 ) is used to focus this electromagnetic wave on the antenna(4) . The central aperture(3) on the primary mirror is used to collect electromagnetic wave reflected from the secondary mirror(1 ) on the antenna(4) . The antenna(4) converts the electromagnetic wave radiation in the millimeter wave and terahertz bands to electrical current and receiver(5) is used to convert the millimeter waves and terahertz to voltage. This is standard working principle of a scanning system .
I n a possible embodiment of the invention, in order to provide the variable-focal length feature to the optical system, the antenna(4) and the secondary mirror(1 ) can be fixed and the primary mirror(2) can be moved towards the secondary mirror(1 ) .
I n an another embodiment of the invention, in order to provide the variable-focal length feature to the optical system , the distance between the secondary mirror(1 ) and the antenna(4) may be fixed, then fixing the primary mirror’s(2) position, secondary mirror(1 ) and the antenna(4) can be moved as they have a constant distance between them.

Claims

CLAI MS
1 . Passive MMW/THz I maging System for Remote Detection of Concealed Objects under the Clothes on Humans comprising ;
• A primary mirror(2) to collect the electromagnetic wave radiation in millimeter wave and terahertz bands,
• An antenna(4) to convert the electromagnetic wave in millimeter wave and
terahertz bands to electrical current,
• A receiver(5) to convert millimeter wave and terahertz to voltage,
• A secondary mirror(1 ) to focus electromagnetic wave on the antenna(4) ,
• A central aperture(3) on the primary mirror(2) to collect electromagnetic wave reflected from secondary mirror(1 ) on the antenna(4) .
2. Passive MMW/THz I maging System for Remote Detection of Concealed Objects under the Clothes on Humans according to claim 1 , characterized in that variable focal length feature is utilized as the antenna(4) and the secondary mirror(1 ) are fixed and the primary mirror(2) is moved towards the secondary mirror(1 ) .
3. Passive MMW/THz I maging System for Remote Detection of Concealed Objects under the Clothes on Humans according to claim 1 , characterized in that variable focal length feature is utilized as the distance between the secondary mirror( 1 ) and the antenna(4) is fixed, then fixing the primary mirror’s(2) position, secondary mirror( 1 ) and the antenna(4) are moved as they have a constant distance between them.
PCT/TR2019/050064 2018-12-26 2019-02-01 Passive mmw/thz imaging system for remote detection of concealed objects under the clothes on humans WO2020139215A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TRPCT/TR2018/050899 2018-12-26
TR2018050899 2018-12-26

Publications (1)

Publication Number Publication Date
WO2020139215A1 true WO2020139215A1 (en) 2020-07-02

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/TR2019/050064 WO2020139215A1 (en) 2018-12-26 2019-02-01 Passive mmw/thz imaging system for remote detection of concealed objects under the clothes on humans

Country Status (1)

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WO (1) WO2020139215A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007027827A2 (en) * 2005-08-30 2007-03-08 Trex Enterprises Corp. Millimeter wave imaging unit with frequency scanning antenna
US20070235658A1 (en) * 2004-05-26 2007-10-11 Zimdars David A Terahertz imaging system for examining articles
EP2443437A1 (en) * 2009-06-19 2012-04-25 Smiths Heimann GmbH Method and device for detecting hidden objects by means of electromagnetic millimeter waves

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070235658A1 (en) * 2004-05-26 2007-10-11 Zimdars David A Terahertz imaging system for examining articles
WO2007027827A2 (en) * 2005-08-30 2007-03-08 Trex Enterprises Corp. Millimeter wave imaging unit with frequency scanning antenna
EP2443437A1 (en) * 2009-06-19 2012-04-25 Smiths Heimann GmbH Method and device for detecting hidden objects by means of electromagnetic millimeter waves

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