Classifications

• • 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)

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Citations (6)

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• 2014
  • 2014-08-07 US US15/324,039 patent/US10215971B2/en active Active
  • 2014-08-07 CN CN201480079491.1A patent/CN106415351B/zh active Active
  • 2014-08-07 DE DE112014006729.6T patent/DE112014006729B4/de active Active
  • 2014-08-07 WO PCT/CN2014/083866 patent/WO2016019539A1/zh not_active Ceased
  • 2014-08-07 JP JP2017506709A patent/JP6391807B2/ja active Active

Patent Citations (6)

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