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50-100 μm band refraction double separation THz camera lens

A photographic lens and wavelength band technology, applied in optical components, optics, instruments, etc., can solve the problems of not considering the aberration of the CCD detector crystal protection sheet, the difficulty of non-refractive lens processing, and the high price of the lens, so as to achieve good relative distortion and Effects of chromatic aberration of magnification, reduction of lens weight, and reduction of lens size

Inactive Publication Date: 2016-08-17
CHANGCHUN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The THz optical system described in this proposal consists of three lenses, including diffractive elements, however, the processing of this non-refractive lens is very difficult
The lens material is thallium bromide-thallium iodide (KRS-5) crystal, which makes the lens expensive, which is not conducive to popularization and application
[0011] The prior art does not take into account the aberration of the CCD detector crystal protection plate, that is, the parallel plate in the design of the imaging optical system, and the parallel plate located in the converging light path of the THz photographic lens will make the image quality worse

Method used

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  • 50-100 μm band refraction double separation THz camera lens
  • 50-100 μm band refraction double separation THz camera lens
  • 50-100 μm band refraction double separation THz camera lens

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The data of the THz photographic lens with a wavelength band of 50-100 μm and a focal length of 45 mm is given in the table below, and the data unit in the table is millimeter.

[0025]

[0026] Among them: the convex surface of the converging convex-concave positive lens 1 is an ellipsoid of order 8, and its coefficient is: -3.1461×10 -4 , 7.8671×10 -7 , -4.4511×10 -11, 2.1432×10 -13 . The size of the clear aperture of the convex ellipsoid in the table is the size of the aperture stop of the THz photographic lens.

[0027] The MTF curves of each field of view of the THz camera lens show that its optical system has excellent image quality, such as figure 2 As shown, the MTF curves of each field of view of the optical system in the figure almost coincide with the diffraction-limited MTF curve of the ideal optical system.

[0028] Although modulation MTF can comprehensively evaluate various aberrations in the optical system, it cannot evaluate DIST, so DIST needs...

Embodiment 2

[0030] The data of the THz photographic lens with a wavelength band of 50-100 μm and a focal length of 25 mm is given in the table below, and the data unit in the table is millimeter.

[0031]

[0032] When the focal length of the THz camera lens is reduced to 25mm, the image quality of the optical system is excellent, such as Figure 4 As shown, the MTF curves of each field of view in the figure almost coincide with the diffraction-limited MTF curves of the ideal optical system. DIST is less than 0.5%, such as Figure 5 As shown, it is far less than 5%, indicating that the optical system DIST fully meets the imaging requirements.

Embodiment 3

[0034] The data of the THz photographic lens with a wavelength band of 50-100 μm and a focal length of 100 mm is given in the table below, and the data unit in the table is millimeter.

[0035]

[0036] When the focal length of the THz camera lens is enlarged to 100mm, the image quality of the optical system is excellent, such as Figure 6 As shown, the MTF curve of the 0.707 field of view of the optical system in the figure almost coincides with the diffraction-limited MTF curve of the ideal optical system, and the MTF curves of the 0 field of view and the full field of view are close to the diffraction-limited MTF curve of the ideal optical system. DIST is less than 0.5%, such as Figure 7 As shown, it is far less than 5%, indicating that the optical system DIST fully meets the imaging requirements.

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PUM

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Abstract

The invention relates to a 50-100 μm band refraction double-separation THz photographic lens, which belongs to the technical field of THz imaging. The existing THz camera lens has a complex structure and high cost, and the working band is not suitable for astronomy, military and other fields. The THz photographic lens of the present invention is characterized in that, converging convex-concave positive lens, compensating convex-concave positive lens, and parallel flat plates are optically coaxial successively, and the materials are all high-resistance silicon; the convex surface of converging convex-concave positive lens is a high-order ellipsoid, and Coincident, the concave surface of the converging convex-concave positive lens is a standard spherical surface; the convex surface and the concave surface of the compensation convex-concave positive lens are standard spherical surfaces, the convex surface of the compensation convex-concave positive lens is opposite to and separated from the concave surface of the converging convex-concave positive lens; the concave surface of the compensation convex-concave positive lens and Parallel plates face each other and move away from each other. Since there are only two lenses, both of which are refracting lenses, the structure is simple and the cost is reduced; the working band is extended to 50-100 μm.

Description

technical field [0001] The invention relates to a 50-100 μm band refraction double-separation THz photographic lens, which belongs to the technical field of THz (Terahertz, terahertz) imaging. Background technique [0002] THz refers to a band with a frequency of 0.1-10 THz and a wavelength of 3-0.03 mm. The electromagnetic wave in this band, that is, the THz wave, is between infrared light and millimeter waves. THz waves have the following properties, which give THz technology many unique uses: [0003] 1. THz waves have good penetration to many dielectric materials and non-polar liquids, which enables THz waves to be used for quality inspection or safety inspection of packaged items; [0004] 2. The energy of THz waves is several orders of magnitude lower than that of X-rays, and will not cause ionization loss to biological tissues, which makes it safe in biomedical inspections; [0005] 3. The frequency of THz waves is very high and the pulse is very short, and its time...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B13/00G02B13/18
Inventor 王文生刘莹莹苗华陈宇
Owner CHANGCHUN UNIV OF SCI & TECH