Expansion of an athermal chart into a multilens system with thick lenses spaced apart

Tamagawa, Yasuhisa; Tajime, T.

doi:10.1117/1.600984

Cited by 29 publications

(21 citation statements)

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“…(15) we see how simple and intuitive it is to include the housing material. When two materials are given, unlike some of the previous methods [5][6][7][8], the proposed method can be used to visually determine exactly what CTE of the housing is required to athermalize and achromatize a system. Meanwhile, if any material M ′1(ω ′1, γ ′1) and housing are given, then the counterpart material M ′2(ω ′2, γ ′2)…”

Section: Expanded Athermal Glass Mapmentioning

confidence: 99%

“…For a single thin lens of power φ i and Abbe number vi, the thermal power γ i and chromatic power ωi are given as follows [5,6]:…”

Section: Athermal and Achromatic Conditionsmentioning

confidence: 99%

“…In such an optical system with an arbitrary number of elements, the following equations must be satisfied for axial color to be corrected [5][6][7][8][9][10][11]:…”

Section: Athermal and Achromatic Conditionsmentioning

confidence: 99%

“…In addition, we introduce the equivalent single lens and the expanded athermal glass map including a housing material [6][7][8]. Even though a lens system is composed of many elements, we can simply identify a pair of materials that satisfies the athermal and achromatic conditions by selecting the corresponding materials from an expanded athermal glass map.…”

Section: Introductionmentioning

confidence: 99%

“…As an alternative approach to overcome these problems, a graphical method has been developed [4][5][6][7]. Although this method is robust, it requires a complex process and calculations to achieve an athermalized and achromatized system having more than three elements.…”

Section: Introductionmentioning

confidence: 99%

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Graphical Selection of Optical Materials Using an Expanded Athermal Glass Map and Considering the Housing Material for an Athermal and Achromatic Design

Lim¹,

Kim²,

Park³

2015

Journal of the Optical Society of Korea

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This paper presents a new graphical method for selecting a pair of optical glass and housing materials to simultaneously achromatize and athermalize a multilens system composed of many elements. To take into account the lens spacing and housing, we quantify the lens power, chromatic power, and thermal power by weighting the ratio of the paraxial ray height at each lens to them. In addition, we introduce the equivalent single lens and the expanded athermal glass map including a housing material. Even though a lens system is composed of many elements, we can simply identify a pair of glass and housing materials that satisfies the athermal and achromatic conditions. Applying this method to design a black box camera lens equipped with a 1/4-inch image sensor having a pixel width of 2 µm, the chromatic and thermal defocusings are reduced to less than the depth of focus, over the specified ranges in temperature and frequency.

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Section: Expanded Athermal Glass Mapmentioning

confidence: 99%

“…For a single thin lens of power φ i and Abbe number vi, the thermal power γ i and chromatic power ωi are given as follows [5,6]:…”

Section: Athermal and Achromatic Conditionsmentioning

confidence: 99%

“…In such an optical system with an arbitrary number of elements, the following equations must be satisfied for axial color to be corrected [5][6][7][8][9][10][11]:…”

Section: Athermal and Achromatic Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Graphical Selection of Optical Materials Using an Expanded Athermal Glass Map and Considering the Housing Material for an Athermal and Achromatic Design

Lim¹,

Kim²,

Park³

2015

Journal of the Optical Society of Korea

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Study of an athermal infrared dual band optical system design containing harmonic diffractive element

Sun

Wang

et al. 2003

Chin. Sci. Bull.

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Study of a middle-wavelength infrared athermalized optical system

Hong-yun

Xiong

2008

Optoelectron. Lett.

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For cooled 320 240 detector with staring focal plane array, a novel middle infrared athermal optical system is presented. The system is composed of 5 spherical lenses. The materials of lenses are silicon and germanium. The optical parameters and modulation transfer function (MTF) are investigated. The system has the diffraction limited image quality and stable image plane from -30 o C to 70 o C. The characteristic parameters of the system are as follows: f/number of 4, cold shield efficiency of 100%, spectrum region of 3.7 4.8 m and transmissivity of 80%. The system has the merits of simple structure, low price, and it is easy to machining.In spatial and military application, the infrared optical systems need to have diffraction limited image quality and stable image plane from -30 o C to 70 o C. Compared with visible light material, the refractive index change coefficient dn/dT of infrared material is much bigger. So the focus shift with temperature is a significant problem in infrared optical systems. At present, aspherical and diffraction surfaces are used in athermalized optical systems to obtain the best thermal compensation, which results in the disadvantages of high price and difficulty of machining [1][2][3][4] . In order to solve the above problem, a novel optical passive athermal system is proposed in this letter. The system is designed for cooled 320 240 detector with staring focal plane array. The system, which is composed of 5 spherical lenses, is a re-imaging optical system. The materials of lenses are silicon and germanium, and the material of mechanical structure is Aluminum. The optical design parameters, schematic diagram, and MTF curves at different temperatures are given. Because the optical system is designed for a 320×240 staring focal plane array sensor, based on practical application requirement and feature parameters of the detector, it has the following characteristic parameters, as shown in Tab.1. According to the characteristics of cooled infrared optical system, it has the merits of small lens aperture and 100% cold shield efficiency [5][6] . The system adopts the optical pas-

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Expansion of an athermal chart into a multilens system with thick lenses spaced apart

Cited by 29 publications

References 0 publications

Graphical Selection of Optical Materials Using an Expanded Athermal Glass Map and Considering the Housing Material for an Athermal and Achromatic Design

Graphical Selection of Optical Materials Using an Expanded Athermal Glass Map and Considering the Housing Material for an Athermal and Achromatic Design

Study of an athermal infrared dual band optical system design containing harmonic diffractive element

Study of a middle-wavelength infrared athermalized optical system

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