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Small F-number dielectric lens improving depth of field of passive millimeter-wave imaging system

A millimeter wave imaging and dielectric lens technology, which is used in geological exploration using millimeter waves, radio wave measurement systems, electromagnetic wave detection, etc., can solve problems such as small depth of field, and achieve the effect of improving depth of field and large movable range.

Inactive Publication Date: 2015-07-08
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the problem that the depth of field of the existing passive millimeter wave imaging system is small, the present invention further proposes a small F-number dielectric lens for improving the depth of field of the passive millimeter wave imaging system

Method used

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  • Small F-number dielectric lens improving depth of field of passive millimeter-wave imaging system
  • Small F-number dielectric lens improving depth of field of passive millimeter-wave imaging system
  • Small F-number dielectric lens improving depth of field of passive millimeter-wave imaging system

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specific Embodiment approach 1

[0010] Specific implementation mode one: combine figure 1 Describe this embodiment. A small F-number dielectric lens for improving the depth of field of a passive millimeter-wave imaging system described in this embodiment is formed by sequentially connecting a left-rotation hyperboloid 1 and a right-rotation hyperboloid 2. The apex of the left-rotation hyperboloid 1 The radius of curvature is 14.5mm, and the radius of curvature of the vertex of the right-rotation hyperboloid 2 is 58mm. The dielectric constant is 2.2.

[0011] Set up the x1oy Cartesian coordinate system in the vertical direction with the geometric center of the hyperboloid 1 surface of the left rotation as the zero point, and establish the x2oy Cartesian coordinate system in the vertical direction with the geometric center of the hyperboloid 2 surface of the right rotation as the zero point. In this embodiment, the left rotation The calculation formula of hyperboloid 1 is:

[0012] ...

specific Embodiment approach 2

[0016] Specific implementation mode two: combination figure 1 Describe this embodiment, the height H of the lens composed of a left-rotation hyperboloid 1 and a right-rotation hyperboloid 2 of a small F-number dielectric lens that improves the depth of field of a passive millimeter-wave imaging system described in this embodiment is 96mm, and the left-rotation hyperboloid The length L of the lens composed of 1 and right-rotating hyperboloid 2 is 50mm. Other components and connections are the same as those in the first embodiment.

specific Embodiment approach 3

[0017] Specific implementation mode three: combination figure 1 This embodiment is described. The edge of the lens composed of left-rotation hyperboloid 1 and right-rotation hyperboloid 2 of a small F-number dielectric lens for improving the depth of field of a passive millimeter-wave imaging system described in this embodiment is provided with a metal reflector.

[0018] The technical effect of this embodiment is: such arrangement can prevent lens edge diffraction from affecting the receiving performance of the receiver. Other compositions and connections are the same as those in Embodiment 1 or 2.

[0019] working principle

[0020] combine figure 2 Explain the working principle of the present invention: according to Fermat's principle, the spherical wave whose phase center is located at the focal point of the left-rotating hyperboloid of the lens passes through the lens and then converges at the focal point of the right-rotating hyperboloid. Millimeter waves have quasi-...

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Abstract

The invention relates to small F-number dielectric lenses, in particular to a small F-number dielectric lens improving the depth of field of a passive millimeter-wave imaging system. The small F-number dielectric lens aims at solving the problem that the depth of field of an existing passive millimeter-wave imaging system is small. A left-hand rotation hyperboloid and a right-hand rotation hyperboloid are sequentially connected into a whole, the curvature radius of the vertex of the left-hand rotation hyperboloid is 14.5 mm, the curvature radius of the vertex of the right-hand rotation hyperboloid is 58 mm, the left-hand rotation hyperboloid and the right-hand rotation hyperboloid are made of polytetrafluoroethylene, and the dielectric constant of the left-hand rotation hyperboloid and the dielectric constant of the right-hand rotation hyperboloid are each 2.2. The small F-number dielectric lens is applied to the field of millimeter-wave imaging.

Description

technical field [0001] The invention relates to a small F-number dielectric lens, in particular to a small F-number dielectric lens for improving the depth of field of a passive millimeter-wave imaging system, and belongs to the field of millimeter-wave imaging. Background technique [0002] The millimeter wave band is located between microwave and infrared, and has its own unique properties in addition to the common characteristics of microwave and infrared. Compared with microwave, millimeter wave has good directivity, strong anti-interference ability, good detection performance, and can penetrate plasma; compared with infrared, millimeter wave is less affected by airflow and has a strong ability to distinguish metal targets from the surrounding environment. Compared with photoelectric detectors, millimeter-wave detectors can work in harsh weather conditions, have all-weather working capabilities, provide special information that infrared and visible light detectors cannot...

Claims

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Application Information

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IPC IPC(8): G01S7/03G01V3/12H01Q15/08H01Q15/23
CPCG01V8/005H01Q15/08H01Q15/23
Inventor 谷海川邱景辉宗华
Owner HARBIN INST OF TECH
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