WO2016019539A1 - 远红外成像透镜组、物镜及探测仪 - Google Patents

远红外成像透镜组、物镜及探测仪 Download PDF

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Publication number
WO2016019539A1
WO2016019539A1 PCT/CN2014/083866 CN2014083866W WO2016019539A1 WO 2016019539 A1 WO2016019539 A1 WO 2016019539A1 CN 2014083866 W CN2014083866 W CN 2014083866W WO 2016019539 A1 WO2016019539 A1 WO 2016019539A1
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curved surface
lens
far infrared
infrared imaging
curvature
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PCT/CN2014/083866
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English (en)
French (fr)
Inventor
李家英
周朝明
孙博
高云峰
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深圳市大族激光科技股份有限公司
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Priority to DE112014006729.6T priority Critical patent/DE112014006729B4/de
Priority to JP2017506709A priority patent/JP6391807B2/ja
Priority to US15/324,039 priority patent/US10215971B2/en
Priority to PCT/CN2014/083866 priority patent/WO2016019539A1/zh
Priority to CN201480079491.1A priority patent/CN106415351B/zh
Publication of WO2016019539A1 publication Critical patent/WO2016019539A1/zh

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/02—Constructional details
    • G01J5/08—Optical arrangements
    • G01J5/0806—Focusing or collimating elements, e.g. lenses or concave mirrors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/10—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors
    • G01J5/20—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors using resistors, thermistors or semiconductors sensitive to radiation, e.g. photoconductive devices
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/021—Mountings, adjusting means, or light-tight connections, for optical elements for lenses for more than one lens
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/04—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having two components only
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/04—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having two components only
    • G02B9/06—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having two components only two + components

Definitions

  • the present invention relates to the field of optics, and in particular to a far infrared imaging lens group, a far infrared imaging objective lens and a far infrared detector.
  • the detectors used in traditional monitoring systems are mostly “active detection.” Such as “visible light”, “infrared light”, “ultraviolet light”, etc., they are all “active” systems, and it is quite difficult to arrange the monitoring system.
  • Monitoring the target by using the characteristics of the super-infrared light emitted by the monitoring target itself reduces the complexity of the entire monitoring system.
  • the penetration of visible light sources is poor, ultra-infrared light (ie, heat flow) can pass unimpeded, so this technology can be widely used in places such as fire fighting, night burglary control.
  • Far-infrared monitoring generally involves the use of the temperature difference between the radiation source and the environment to detect the monitoring target, so its infrared imaging capability and temperature resolution capability are very important.
  • a far infrared imaging lens group comprising a first lens and a second lens arranged in sequence along a main axis:
  • the first lens has a first curved surface and a second curved surface, the first curved surface has a radius of curvature of 2.4 ⁇ (1 ⁇ 5%) mm, and the second curved surface has a radius of curvature of 2 ⁇ (1 ⁇ 5%) mm;
  • the second lens has a third curved surface and a fourth curved surface, the third curved surface has a radius of curvature of 50 ⁇ (1 ⁇ 5%) mm, and the fourth curved surface has a radius of curvature of 60 ⁇ (1 ⁇ 5%) mm;
  • the first curved surface, the second curved surface, the third curved surface, and the fourth curved surface are sequentially arranged, and the first curved surface, the second curved surface, and the third curved surface are both convex toward the object side, and the fourth curved surface is convex toward the image side.
  • the spacing between the second curved surface and the third curved surface is 1 x (1 ⁇ 5%) mm.
  • the first lens has a center thickness of 0.8 x (1 ⁇ 5%) mm.
  • the second lens has a center thickness of 0.8 x (1 ⁇ 5%) mm.
  • the first lens and the second lens are made of ZnSe.
  • a far infrared imaging objective includes a lens barrel and a lens group as described above for accommodating the lens group.
  • the barrel length is 5.8 mm.
  • a far infrared detector comprising a far infrared imaging objective and a thermal receiver as described above, the thermal receiver being disposed at a focus of the objective lens.
  • the thermal receiver employs a 1/4" "Hg. Cd. Te" thermal tube.
  • the above-mentioned far-infrared detector and its objective lens and lens group can detect distant targets in an environment such as night and fog, and have high imaging capability.
  • FIG. 1 is a schematic structural view of a lens group of an embodiment
  • FIG. 2 is an objective lens transfer function curve based on the lens group of FIG. 1;
  • Figure 3 is a perspective view of an objective lens of the lens group based on Figure 1;
  • FIG. 4 is a wide beam diagram of the objective lens based on the lens group of FIG. 1 over the entire image plane.
  • the far-infrared imaging lens group 10 includes a first lens 100 and a second lens 200 which are sequentially arranged along a main axis.
  • the first lens 100 is a meniscus lens and the second lens 200 is a lenticular lens.
  • the major axis of the lens is the axis that passes through the center of the lens and is perpendicular to the lens.
  • the first lens 100 and the second lens 200 coincide with each other.
  • the lens group of this embodiment is mainly used for detecting far-infrared light, particularly far-infrared light having a wavelength of 10.64 nm.
  • the left side is the object side and the right side is the image side.
  • the light from the far-infrared source is incident from the object side and is clearly imaged on the focal plane of the image side of the lens group.
  • the first lens 100 has a first curved surface 102 and a second curved surface 104.
  • the first curved surface 102 is convex toward the object side
  • the second curved surface 104 is concave toward the first curved surface 102 (that is, the second curved surface 104 is convex toward the object side).
  • the first curved surface 102 has a radius of curvature of 2.4 ⁇ (1 ⁇ 5%) mm
  • the second curved surface has a radius of curvature of 2 ⁇ (1 ⁇ 5%) mm.
  • the center thickness of the first lens 100 i.e., the thickness of the first lens 100 on the main axis
  • the first lens 100 can be made of the material ZnSe.
  • the second lens 200 has a third curved surface 202 and a fourth curved surface 204.
  • the third curved surface 202 is convex toward the object side, and the fourth curved surface 204 is convex toward the image side.
  • the third curved surface 202 has a radius of curvature of 50 ⁇ (1 ⁇ 5%) mm, and the fourth curved surface 204 has a radius of curvature of 60 ⁇ (1 ⁇ 5%) mm.
  • the center thickness of the second lens 200 (that is, the thickness of the second lens 200 on the main axis) is 0.8 ⁇ (1 ⁇ 5%) mm.
  • the second lens 200 can be made of the material ZnSe.
  • the spacing between the second curved surface 104 and the third curved surface 202 is 1 ⁇ (1 ⁇ 5%) mm.
  • each lens is as follows. The above dimensions can be floated within a tolerance of ⁇ 5%.
  • the curvature of the curved surface 102 is 2.4 mm;
  • the curved surface 104 has a radius of curvature of 2 mm;
  • the material is ZnSe
  • the curved surface 202 has a radius of curvature of 50 mm;
  • the radius of curvature of the curved surface 204 is -60 mm (ie, the convex direction is toward the image side);
  • the material is ZnSe
  • the curved surface 104 of the lens 100 and the curved surface 202 of the lens 200 are at a distance of 1 mm.
  • Fig. 2 is an objective lens transfer function M.T.F based on the lens group.
  • Fig. 3 is a view of the objective lens beamlet based on the lens group.
  • Fig. 4 is a wide beam diagram of the objective lens based on the lens group over the entire image plane.
  • the diameter of the circle of the entire field of view is within ⁇ ⁇ 10 ⁇ m.
  • the distortion is ideal, and the beam quality is basically matched with the wide beam, and the phase is uniform. And the quality of the imaging center and the edge are consistent, and the thermal imaging quality has been met.
  • a far infrared imaging objective lens By assembling the above lens group in the lens barrel, a far infrared imaging objective lens can be formed.
  • the overall length of the objective lens is 5.8 mm.
  • the entrance pupil is 1 mm in diameter.
  • the above far infrared imaging objective can be used for a far infrared detector.
  • a thermal receiver is provided at the focal plane of the far infrared imaging objective.
  • the far-infrared source is received by the thermal receiver through the focus of the objective lens.
  • far infrared detection is realized.
  • the above heat sensitive receiver can employ a "Hg. Cd. Te" heat sensitive tube.
  • the material Hg.Cd.Te can sense infrared light in the range of -40 °C to 650 °C, and the image can be imaged when the object is photographed at a temperature difference of 0.05 °C - 0.15 °C.
  • the obtained temperature difference imaging, the resolution capability is the temperature difference image of the object being illuminated. Therefore, the imaging ability is strong and the temperature resolution is large.
  • the above-mentioned far-infrared detector and its objective lens and lens group can detect far-distance targets in the environment of night and fog by detecting far-infrared light, and can be widely used in fire fighting, monitoring, high-voltage line detection and the like.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Lenses (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)

Abstract

一种远红外探测仪及其物镜和透镜组。远红外成像透镜组（10）包括依次沿主轴排列的第一透镜（100）和第二透镜（200），第一透镜（100）具有曲率半径为2.4×(1±5％)毫米的第一曲面（102）和曲率半径为2×(1±5％)毫米的第二曲面（104），第二透镜（200）具有曲率半径为50×(1±5％)毫米的第三曲面（202）和曲率半径为60×(1±5％)毫米的第四曲面（204）；其中，第一曲面（102）、第二曲面（104）、第三曲面（202）以及第四曲面（204）依序排列，第一曲面（102）、第二曲面（104）、第三曲面（202）均凸向物体一侧，第四曲面（204）凸向像侧。可以在黑夜、大雾等环境下探测远处目标，具有较高的成像能力。

Description

远红外成像透镜组、物镜及探测仪
【技术领域】
本发明涉及光学领域，特别是涉及一种远红外成像透镜组、一种远红外成像物镜及一种远红外探测仪。
【背景技术】
传统的监控系统中使用的探测仪，多为“有源探测”。如“可见光”，“红外光”，“紫外光”等，它们都是“有源”系统，布置监控系统相当困难。利用监控目标本身发出超红外光的特点来监视目标则使整个监控系统复杂度降低。如遇到烟雾、雾霾、夜晚全黑等可见光源穿透能力较差的情况，超红外光（即热流）却可通行无阻，因此这种技术可广泛应用诸如消防、夜晚盗控等场合。远红外监控一般涉及利用辐射源与环境的温度差来发现监控目标，因此其红外成像能力和温度分辨能力非常重要。
【发明内容】
基于此，有必要提供一种成像能力强的远红外透镜组。
此外，还提供一种远红外成像物镜。
以及一种远红外探测仪。
一种远红外成像透镜组，包括依次沿主轴排列的第一透镜和第二透镜：
所述第一透镜具有第一曲面和第二曲面，所述第一曲面曲率半径为2.4×（1±5%）毫米，第二曲面曲率半径为2×（1±5%）毫米；
所述第二透镜具有第三曲面和第四曲面，所述第三曲面曲率半径为50×（1±5%）毫米，第四曲面曲率半径为60×（1±5%）毫米；
其中，所述第一曲面、第二曲面、第三曲面以及第四曲面依序排列，且第一曲面、第二曲面、第三曲面均凸向物体一侧，第四曲面凸向像侧。
在其中一个实施例中，所述第二曲面和第三曲面之间的间距为1×（1±5%）毫米。
在其中一个实施例中，所述第一透镜的中心厚度为0.8×（1±5%）毫米。
在其中一个实施例中，所述第二透镜的中心厚度为0.8×（1±5%）毫米。
在其中一个实施例中，所述第一透镜和第二透镜的制作材料为ZnSe。
一种远红外成像物镜，包括镜筒和如上所述的透镜组，所述镜筒用于容纳所述透镜组。
在其中一个实施例中，所述镜筒长度为5.8毫米。
一种远红外探测仪，包括如上所述的远红外成像物镜和热敏接收器，所述热敏接收器设于所述物镜的焦点处。
在其中一个实施例中，所述热敏接收器采用1/4"的“Hg.Cd.Te”热敏管。
上述远红外探测仪及其物镜和透镜组，可以在黑夜、大雾等环境下探测远处目标，具有较高的成像能力。
【附图说明】
图1为一实施例的透镜组结构示意图；
图2为基于图1的透镜组的物镜传递函数曲线；
图3为基于图1的透镜组的物镜细光束图；
图4为基于图1的透镜组的物镜在整个像面上的宽光束图。
【具体实施方式】
如图1所示，为一实施例的远红外成像透镜组排列示意图。该远红外成像透镜组10包括依次沿主轴排列的第一透镜100和第二透镜200。第一透镜100为弯月凸透镜，第二透镜200为双面凸透镜。透镜的主轴是穿过透镜中心并与透镜垂直的轴。第一透镜100和第二透镜200主轴重合。
本实施例的透镜组主要用于探测远红外光，特别是波长为10.64纳米的远红外光。图1中的左侧为物侧，右侧为像侧。远红外光源的光线从物侧入射，并在透镜组像侧的焦平面上清晰成像。
具体地，第一透镜100具有第一曲面102和第二曲面104。第一曲面102向物方凸出，第二曲面104相对于第一曲面102向内凹（也即第二曲面104向物方凸出）。第一曲面102的曲率半径为2.4×（1±5%）毫米，第二曲面曲率半径为2×（1±5%）毫米。第一透镜100的中心厚度（也即第一透镜100在主轴上的厚度）为0.8×（1±5%）毫米。第一透镜100可采用材料ZnSe制作。
第二透镜200具有第三曲面202和第四曲面204。第三曲面202向物方凸出，第四曲面204向像侧凸出。第三曲面202曲率半径为50×（1±5%）毫米，第四曲面204曲率半径为60×（1±5%）毫米。第二透镜200的中心厚度（也即第二透镜200在主轴上的厚度）为0.8×（1±5%）毫米。第二透镜200可采用材料ZnSe制作。
进一步地，第二曲面104和第三曲面202之间的间距为1×（1±5%） 毫米。
在一个较优的实施例中，各透镜的尺寸及位置关系如下所示。上述尺寸在±5%的公差范围内浮动均可。
透镜100：
曲面102曲率半径2.4毫米；
曲面104曲率半径2毫米；
中心厚度0.8毫米；
材料为ZnSe；
透镜200：
曲面202曲率半径50毫米；
曲面204曲率半径-60毫米（即凸出方向朝向像侧）；
中心厚度0.8毫米；
材料为ZnSe；
透镜100的曲面104和透镜200的曲面202距离为1毫米。
该透镜组的通光的波长λ=10.64nm；
整体焦距ƒ′=4mm；
D/ƒ=1：1.5；
2ω=53°。
图2是基于该透镜组的物镜传递函数M.T.F。图3是基于该透镜组的该物镜细光束图。图4是基于该透镜组的该物镜在整个像面上的宽光束图。
根据图2~图4可知，整个视场范围内弥散圆直径Φ≤10μm之内。畸变较理想，而且细光束质量与宽光束基本相配合，相质均匀。并且成像中心与边缘的质量一致，已达到热成像质量的要求。
将上述透镜组组装在镜筒中，可以形成远红外成像物镜。物镜的整体长度为5.8毫米。入瞳直径为1毫米。
上述远红外成像物镜可用于远红外探测仪。在远红外成像物镜的焦平面处，设置热敏接收器。远红外光源通过物镜的聚焦，由热敏接收器接收。进而实现远红外探测。上述热敏接收器可采用“Hg.Cd.Te”热敏管。材料Hg.Cd.Te能感应到物体在-40℃-650℃范围内的红外光，而物体被摄而温度差别为0.05℃-0.15℃的影像即可成像。得到的温差成像，其分辨率能力即为被照物体温差像。因而成像能力较强，温度分辨率较大。
上述远红外探测仪及其物镜和透镜组，可以通过检测远红外光在黑夜、大雾等环境下探测远处目标，可广泛应用于消防、监控、高压线探测等场合。
以上所述实施例仅表达了本发明的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对本发明专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干变形和改进，这些都属于本发明的保护范围。因此，本发明专利的保护范围应以所附权利要求为准。

Claims (10)

  1. 一种远红外成像透镜组，包括依次沿主轴排列的第一透镜和第二透镜，其特征在于：
    所述第一透镜具有第一曲面和第二曲面，所述第一曲面曲率半径为2.4×（1±5%）毫米，第二曲面曲率半径为2×（1±5%）毫米；
    所述第二透镜具有第三曲面和第四曲面，所述第三曲面曲率半径为50×（1±5%）毫米，第四曲面曲率半径为60×（1±5%）毫米；
    其中，所述第一曲面、第二曲面、第三曲面以及第四曲面依序排列，且第一曲面、第二曲面、第三曲面均凸向物体一侧，第四曲面凸向像侧。
  2. 根据权利要求1所述的远红外成像透镜组，其特征在于，所述第二曲面和第三曲面之间的间距为1×（1±5%）毫米。
  3. 根据权利要求1所述的远红外成像透镜组，其特征在于，所述第一透镜的中心厚度为0.8×（1±5%）毫米。
  4. 根据权利要求1所述的远红外成像透镜组，其特征在于，所述第二透镜的中心厚度为0.8×（1±5%）毫米。
  5. 根据权利要求1所述的远红外成像透镜组，其特征在于，所述第一透镜和第二透镜的制作材料为ZnSe。
  6. 一种远红外成像物镜，包括镜筒和如权利要求1~6任一项所述的透镜组，所述镜筒用于容纳所述透镜组。
  7. 根据权利要求7所述的远红外成像物镜，其特征在于，所述镜筒长度为5.8毫米。
  8. 一种远红外探测仪，包括如权利要求8的远红外成像物镜和热敏接收器，所述热敏接收器设于所述物镜的焦点处。
  9. 根据权利要求9所述的远红外探测仪，其特征在于，所述热敏接收器采用1/4"的“Hg.Cd.Te”热敏管。
  10. 根据权利要求9所述的远红外探测仪，其特征在于，所述热敏接收器采用1/4"的“Hg.Cd.Te”热敏管。
PCT/CN2014/083866 2014-08-07 2014-08-07 远红外成像透镜组、物镜及探测仪 WO2016019539A1 (zh)

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PCT/CN2014/083866 WO2016019539A1 (zh) 2014-08-07 2014-08-07 远红外成像透镜组、物镜及探测仪
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CN106415351A (zh) 2017-02-15
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