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Athermal and Achromatic Design for a Night Vision Camera Using Tolerable Housing Boundary on an Expanded Athermal Glass Map 원문보기

Current optics and photonics, v.1 no.2, 2017년, pp.125 - 131  

Ahn, Byoung-In (Department of Physics, Dankook University) ,  Kim, Yeong-Sik (Department of Physics, Dankook University) ,  Park, Sung-Chan (Department of Physics, Dankook University)

Abstract ▼ AI-Helper 아이콘AI-Helper

We propose a new graphical method for selecting a pair of optical and housing materials to simultaneously athermalize and achromatize an LWIR optical system. To have a much better opportunity to select the IR glasses and housing materials, an athermal glass map is expanded by introducing the DOE wit...

주제어

#Athermalization   #Achromatization   #Diffractive optical element   #Expanded athermal glass map  

AI 본문요약
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제안 방법

  • In order to solve these problems, this study suggests a new graphical method to obtain the material combination by providing the tolerable housing boundary on an expanded athermal glass map. We introduce the diffractive optical element (DOE) with negative chromatic power to expand an athermal glass map.
  • To design an athermal and achromatic LWIR lens, this study suggests a new graphical method to obtain the material combinations by providing the tolerable housing boundary on an expanded athermal glass map. By introducing the DOE, an athermal glass map is expanded.
  • We can also realize other athermal and achromatic systems by selecting the materials being in tolerable housing boundary. To prove it, five housing materials within this boundary are used to mount the lens elements and evaluate the MTF properties at margin field. The MTFs of these systems mounted in five different housings are very stable over the specified temperature ranges.
  • However, since the available optical and housing materials are limited in an LWIR optics, it is difficult to get available housing materials by changing the optical glass only. To solve this problem, this study suggests a new graphical method to obtain material combinations by providing the tolerable housing boundary which uses the depth of focus in an LWIR optics.

이론/모형

  • In this study, the Ge glass is replaced with the chalcogenide glass of which the surface can easily be aspherized by a mold press method. The molding method enables us to get the mass production so that the chalcogenide glasses are useful in civilian demand for a night vision camera[16].
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참고문헌 (16)

  1. H. Jamieson, "Thermal effects in optical systems," Opt. Eng. 20, 156-160 (1981). 

  2. Y. Tamagawa, "Design of an athermalized hybrid single lens in the 3-5 ${\mu}m$ wavelength band," OPTCAL REVIEW, 321-323 (1997). 

  3. K. Schwertz, D. Dillon, and S. Sparrold, "Graphically selecting optical components and housing material for color correction and passive athermalization," Proc. SPIE 8486, 84860E1-84860E18 (2012). 

  4. T. Y. Lim and S. C. Park, "Achromatic and athermal lens design by redistributing the element powers on an athermal glass map," Opt. Express 24, 18049-18058 (2016). 

    상세보기 crossref

  5. T. Y. Lim, Y. S. Kim, and S. C. Park, "Graphical selection of optical materials using an expanded athermal glass map and considering the housing material for an athermal and achromatic design," J. Opt. Soc. Korea 19, 531-536 (2015). 

    원문보기 상세보기 crossref

  6. C. Londono, Design and Fabrication of Surface Relief Diffractive Optical Elements, or Kinoforms, with Examples for Optical Athermalization (Tufts University PhD dissertation, Boston, USA, 1992), Chapter 1. 

  7. Y. G. Hong, S. I. Kim, W. G. Yeo, and C. K. Lee, "Telephotolens design with refractive/diffractive hybrid lens," J. Opt. Soc. Korea 1, 74-80 (1997). 

    원문보기 상세보기 crossref

  8. G. P. Behrmann and J. P. Bowen, "Influence of temperature on diffractive lens performance," Appl. Opt. 32, 2483-2489 (1993). 

    상세보기 crossref

  9. W. C. Sweatt, "Describing holographic optical elements as lenses," J. Opt. Soc. Am. 67, 803-808 (1978). 

  10. Y. Tamagawa and T. Tajime, "Expansion of an athermal chart into a multilens system with thick lenses spaced apart," Opt. Eng. 35, 3001-3006 (1996). 

    상세보기 crossref

  11. R. B. Johnson, "LENSES," in Handbook of Optics, 3rd ed. (McGraw-Hill, New York, USA, 2009), Vol. 1, Chapter 17. 

  12. W. J. Smith, Modern Optical Engineering, 4th ed. (Mc Graw-Hill, New York, USA, 2008), Chapter 9. 

  13. P. J. Rogers and M. Roberts, "Thermal compensation techniques," in Handbook of Optics, 3rd ed. (McGraw-Hill, New York, USA, 2009), Vol. 2, Chapter 8. 

  14. A. M. Baker, "Compact two-element infrared objective lens and IR or thermal sight for weapon having viewing optics," U.S. Patent 20100165455 (2010). 

  15. T. Mishina, M. Okui, and F. Okano, "Viewing-zone enlargement method for sampled hologram that uses high-order diffraction," Appl. Opt. 41, 1489-1499 (2002). 

    상세보기 crossref

  16. J. H. Choi, D. H. Cha, H. Y. Kang, J. H. Kim, and H. J. Kim, "Development of chalcogenide glass with thermal stability for molded infrared lens," Proc. SPIE 8982, 89821U1-89821U7 (2014). 

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