CN109917535A - The compact nothing of refrigeration mode blocks freeform optics system - Google Patents
The compact nothing of refrigeration mode blocks freeform optics system Download PDFInfo
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- CN109917535A CN109917535A CN201910139309.1A CN201910139309A CN109917535A CN 109917535 A CN109917535 A CN 109917535A CN 201910139309 A CN201910139309 A CN 201910139309A CN 109917535 A CN109917535 A CN 109917535A
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Abstract
The invention discloses a kind of compact nothings of refrigeration mode to block freeform optics system, and the system is by being arranged successively: the first reflecting mirror, the second reflecting mirror and third reflecting mirror composition.Three reflecting mirrors are free form surface, using XY multinomial or Zernike multinomial, there is inclination or bias relative to coaxial system and exist simultaneously with inclination.Three reflecting mirrors circumferentially arrange, and light spatially repeatedly intersects, compact-sized.Incident ray is not blocked by three reflecting mirrors, can reach final image planes with 100%.There are intermediate image planes in optical path, between the second reflecting mirror and third reflecting mirror, close to the second reflecting mirror.System stop is located near the first reflecting mirror.The present invention reduces the volume of the off-axis three anti-system of tradition, secondary imaging technology is realized in compact space, so that emergent pupil is located at after third reflecting mirror and is located at except overlapping optical path, can match the cold door screen of refrigeration detector, it realizes 100% cold stop efficiency, improves interacting goals distance.
Description
Technical field
The present invention relates to Optical System Design technical fields, relate generally to a kind of off-axis reflection optical system, especially relate to
And a kind of compact nothing that can be used for refrigeration mode detector blocks freeform optics system.
Background technique
Heavy caliber (>=100mm) optical transmission material construction is expensive, and the characteristics such as index of refraction homogeneity, transmitance are difficult to protect
Card.And reflective optical system does not have color difference, imaging spectral range is wide, and matching with structural material can be realized athermal.Cause
This, heavy-caliber optical system generallys use reflective structure.But there are central obscurations for axis reflector formula system, influence system
Receive energy and image quality, off axis reflector system can be avoided these problems, however traditional off-axis three reflecting optical system, empty
Between arrange not compact enough, be unsatisfactory for more and more harsh onboard spatial requirement.
Currently, compact-sized infrared off-axis reflection optical system mostly uses uncooled detector.As Wang Bo is delivered
Article " the off-axis three reflecting optical systems research of non-brake method ", wherein the off-axis three reflecting optical systems form designed is compact, is used for non-system
Cold infrared detection image.However, the optical system for refrigeration type infrared detector usually requires cold door screen matching, so that optical system
System form is complicated.Changchun University of Science and Technology Jiang Xiwen is designed in " system research of refrigeration mode off-axis reflection optical " a kind of meets cold door screen
Matched off-axis reflection optical system, but its volume is larger, is not able to satisfy compact-sized requirement.United States Patent (USP)
US8616712 discloses a kind of law for nonsymmetric optical systems and its design method, and compact-sized nothing is blocked, but is unsatisfactory for freezing
The cold door screen matching of detector requires.
Summary of the invention
In order to solve the problems existing in the prior art, the present invention proposes that a kind of compact nothing of refrigeration mode blocks freeform optics system
System solves the problems, such as that the cold door screen matching of refrigeration mode off-axis reflection optical system realizes system using free form surface and secondary imaging technology
The compact design of cold mould optical system.
The technical solution of the present invention is as follows:
The compact nothing of a kind of refrigeration mode blocks freeform optics system, it is characterised in that: including diaphragm, the first reflection
Mirror, the second reflecting mirror and third reflecting mirror；Thrihedral reflector is XY multinomial or Zernike polynomial free curved surface, wherein
First face and third face mirror light focal power are positive, and the second face focal power is negative；Diaphragm is located near the first face reflecting mirror；It is incident
Light overlaps three times inside optical system after thrihedral reflector reflects；Emergent pupil is located at the first reflecting mirror and the second reflecting mirror
Except the line of top edge, coupled convenient for refrigeration detector diaphragm.
Further preferred embodiment, a kind of compact nothing of refrigeration mode block freeform optics system, it is characterised in that:
There are intermediate image plane in optical path, intermediate image plane is between the first reflecting mirror and the second reflecting mirror or the second reflecting mirror and
Between three reflecting mirrors.
Further preferred embodiment, a kind of compact nothing of refrigeration mode block freeform optics system, it is characterised in that:
Optical path parameter meets following formula:
ze=(b2-b1)/(k1-k2) (1)
ye=k1*ze+b1 (2)
ye-k3*ze-b3>0 (3)
In formula: b1、b2Respectively 0 visual field, peripheral field cross the light that the heart channel of Hang-Shaoyin third reflecting mirror reflection in entrance pupil reaches image planes
Intercept, k1、k2For the slope of this two light；The intersection point of this two light is the emergent pupil center (y of optical systeme ze)；k3、
b3It is rim ray through entrance pupil top edge, passes through the slope and intercept of the light between the first reflecting mirror and the second reflecting mirror.
Beneficial effect
It is off-axis compared to traditional the beneficial effects of the invention are as follows the compact arrangement for realizing reflecting system using free form surface
Three instead have advantage small in size, while emergent pupil is located at before final image planes, are suitable for the matching cold door screen of refrigeration detector, realize
100% cold stop efficiency.The present invention can apply infrared refrigeration detection system and other cold matched electro-optical systems of door screen of needs,
Improve interacting goals distance.
Detailed description of the invention
Fig. 1 is that the compact nothing of refrigeration mode of the present invention blocks free form surface imaging system structure composition schematic diagram.
Fig. 2 is coordinate system and space light label schematic diagram of the present invention.
Fig. 3 is visual field setting figure of the embodiment of the present invention.
Fig. 4 is exit pupil position of embodiment of the present invention constraint schematic diagram.
Fig. 5 is optical transfer function figure of the embodiment of the present invention.
Fig. 6 is RMS wavefront error figure of the embodiment of the present invention.
Specific embodiment
Present invention aim to address refrigeration mode off-axis reflection optical system it is cold door screen matching the problem of, using free form surface with
Secondary imaging technology realizes the compact design of refrigeration mode optical system.
To achieve the goals above, block freeform optics system the present invention provides a kind of compact nothing of refrigeration mode and set
Meter method.Using free form surface off-axis three anti-technology chief ray is overlapped three times in the region that three pieces of reflecting mirrors are constituted, it is real
Existing refrigeration mode off-axis reflection optical system without block, compact designed.
The compact nothing of the refrigeration mode blocks freeform optics system, comprising: diaphragm, the first reflecting mirror, the second reflection
Mirror and third reflecting mirror.Thrihedral reflector is XY multinomial or Zernike polynomial free curved surface, wherein the first face and
Thrihedral reflector focal power is positive, and the second face focal power is negative.Diaphragm is located near the first face reflecting mirror.Incident ray is through three faces
It is overlapping three times in internal system after mirror reflection.Emergent pupil is located at except the first reflecting mirror and the second reflecting mirror top edge line, just
It is coupled in refrigeration detector diaphragm.
To guarantee the cold door screen matching of refrigeration detector, optical system thrihedral reflector is divided using the focal power of " Negative-Positive-Negative "
Match.Meanwhile in order to reduce the size of each reflecting mirror, aperture diaphragm is arranged near the first reflecting mirror, system emergent pupil is located at the
Except one reflecting mirror and the second reflecting mirror top edge line.
Light trend is controlled by customized constraint, so that each reflecting mirror is not light-blocking.To ensure that system emergent pupil is located at most
Before whole image planes, after folding optical path, it is necessary to meet the following conditions:
1. there are intermediate image plane in optical path, intermediate image plane is between the first reflecting mirror and the second reflecting mirror or second
Between reflecting mirror and third reflecting mirror.
2. meeting following formula:
ze=(b2-b1)/(k1-k2) (1)
ye=k1*ze+b1 (2)
ye-k3*ze-b3>0 (3)
In formula: b1、b2Respectively 0 visual field, peripheral field cross the light that the heart channel of Hang-Shaoyin third reflecting mirror reflection in entrance pupil reaches image planes
Intercept, k1、k2For the slope of this two light.The intersection point of this two light is the emergent pupil center (y of optical systeme ze)。
k3、b3It is rim ray through entrance pupil top edge, passes through the slope and intercept of the light between the first reflecting mirror and the second reflecting mirror.
By constraint control when design, guarantee system emergent pupil except off-axis three reflecting optical system, control emergent pupil center is arrived
The distance of image planes meets the rear cut-off distance of refrigeration detector requirement.
With reference to the accompanying drawing and preferred embodiment the present invention is described in further detail.
It is the structure that the compact nothing of refrigeration mode provided in an embodiment of the present invention blocks freeform optics imaging system shown in Fig. 1
Schematic diagram.The technical scheme is that reducing optical system using off-axis three anti-form and being wanted to large scale transmission material
It asks, reduces the image quality of the volume lifting system of system using three face free form surfaces, focal power and light channel structure are rationally set
Meet the cold door screen matching of refrigeration detector.
The specific compact nothing of refrigeration mode of the present invention block freeform optics system be by the first reflecting mirror S1,
Second reflecting mirror S2, third reflecting mirror S3 and image planes Si composition.Three reflecting mirrors are free form surface, multinomial using Zernike
There is inclination relative to coaxial system or eccentric and inclination exist simultaneously in formula.Three reflecting mirrors circumferentially arrange, and light is in sky
Between it is upper repeatedly overlapping, there are intermediate image planes in optical path, positioned at S2 and S3 between, close S2.System stop is located near S1, emergent pupil
After S3 and it is located at except folding optical path, the cold door screen of refrigeration detector can be matched.
8 μm -12 μm of the optical system works wave band, Entry pupil diameters 137.5, focal length 550mm, F number 4,2 ° × 1.6 ° of visual field,
Using long wave refrigeration mode detector.
Coordinate system and the light definition of the optical system are as shown in Figure 2.The light definition that certain put entrance pupil center on object plane
For r1, it is defined as r2 by the light of entrance pupil Y direction upper end, entrance pupil Y direction lower end light is defined as r3, and entrance pupil X-axis is just
It is defined as r4 to rim ray, entrance pupil X-axis negative direction rim ray is defined as r5.
The visual field setting of the optical system is as shown in Figure 3.Optical system is symmetrical about the face YZ, and X-direction visual field is only arranged one
Half, 5 visual field f1 (0 0), f2 (0 0.8), f3 (0-0.8), f4 (1.0 0.8), f5 (1.0-0.8) are set altogether.
To guarantee the cold door screen matching of refrigeration detector, optical system thrihedral reflector is divided using the focal power of " Negative-Positive-Negative "
Match.While in order to reduce the size of each reflecting mirror, aperture diaphragm is arranged near S1, system emergent pupil is located at the top edge S1 and S2
Except line.Intermediate image plane is between S2 and S3.
As shown in figure 4, the coordinate system and the constraint relationship of optical system of the embodiment of the present invention.Global coordinate system YOZ, Z axis with
Incident ray r1f1 is overlapped, and it is anti-external that coordinate origin is located at three.0 visual field chief ray r1f1 (fine line) of aperture center, with aperture
0.8 ° of center field rays r1f2 (dotted line) intersects at emergent pupil (y after S1, S2, S3 successively reflecte ze), finally arrive respectively
Up to Si.
Y=k1*z+b1It is r1f1 by the light between S3 to Si, y=k2*z+b2It is r1f2 by between S3 to Si
Light, the intersection point of this two light are the emergent pupil center of system, and coordinate is
ze=(b2-b1)/(k1-k2) (1)
ye=k1*ze+b1 (2)
Y=k3*z+b3Be reflected into the light between S2 by S1 for r2f2, emergent pupil center away from this section of light Y direction away from
From for
yd=ye-k3*ze-b3 (3)
Constrain yd> 0 so that system emergent pupil is except off-axis three reflecting optical system, control emergent pupil center to image planes Si away from
From the rear cut-off distance that constraint satisfaction refrigeration detector requires.
Thrihedral reflector is all made of standard Zernike polynomial free curved surface in the present embodiment, excellent using preceding 13 progress
Change, reduces processing difficulties.Each reflecting mirror and the basic parameter of image planes such as table 1, wherein dyFor Y-axis offset, α is to tilt around X-axis
Amount.The face the Zernike type coefficient such as table 2 of each reflecting mirror, wherein Zi, i=1 ... 13 indicate i-th standard Zernike system of polynomials
Number.
Table 1
Table 2
Fig. 5 is the optical transfer function MTF of the present embodiment, it can be seen that its image quality is close to diffraction limit.Fig. 6 is this
Inventive embodiments RMS wavefront error figure, average wavefront error is about λ/40, λ=10 μm.Meet long wave refrigeration detector to imaging
The requirement of quality.
The technical solution of the present embodiment, using off-axis three anti-form, reduction system wants large scale optical transmission material
It asks, reduces the volume of system, the image quality of lifting system, reasonable distribution focal power, using secondary imaging using free form surface
Technology makes light channel structure meet the cold door screen matching of refrigeration detector.
Claims (3)
1. a kind of compact nothing of refrigeration mode blocks freeform optics system, it is characterised in that: including diaphragm, the first reflecting mirror,
Two-mirror and third reflecting mirror；Thrihedral reflector is XY multinomial or Zernike polynomial free curved surface, wherein first
Face and third face mirror light focal power are positive, and the second face focal power is negative；Diaphragm is located near the first face reflecting mirror；Incident ray
After thrihedral reflector reflects, overlapped three times inside optical system；Emergent pupil is located at the first reflecting mirror and the second reflecting mirror top
Except edge line, coupled convenient for refrigeration detector diaphragm.
2. a kind of compact nothing of refrigeration mode blocks freeform optics system according to claim 1, it is characterised in that: in optical path
There are intermediate image plane, intermediate image plane is between the first reflecting mirror and the second reflecting mirror or the second reflecting mirror is reflected with third
Between mirror.
3. a kind of compact nothing of refrigeration mode blocks freeform optics system according to claim 1, it is characterised in that: optical path ginseng
Number meets following formula:
ze=(b2-b1)/(k1-k2) (1)
ye=k1*ze+b1 (2)
ye-k3*ze-b3>0 (3)
In formula: b1、b2Respectively 0 visual field, peripheral field cross section that the heart channel of Hang-Shaoyin third reflecting mirror reflection in entrance pupil reaches the light of image planes
Away from k1、k2For the slope of this two light；The intersection point of this two light is the emergent pupil center (y of optical systeme ze)；k3、b3For
Rim ray passes through the slope and intercept of the light between the first reflecting mirror and the second reflecting mirror through entrance pupil top edge.
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| CN201910139309.1A CN109917535B (en) | 2019-02-24 | 2019-02-24 | Refrigeration type compact non-blocking free-form surface optical system |
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|---|---|---|---|
| CN201910139309.1A CN109917535B (en) | 2019-02-24 | 2019-02-24 | Refrigeration type compact non-blocking free-form surface optical system |
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| CN109917535B CN109917535B (en) | 2021-03-30 |
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Cited By (6)
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| CN110927943A (en) * | 2019-12-26 | 2020-03-27 | 中国科学院长春光学精密机械与物理研究所 | Off-axis three-reflection diffuse reflection plate lighting system |
| CN111238449A (en) * | 2020-01-16 | 2020-06-05 | 中国科学院西安光学精密机械研究所 | Total reflection type underwater camera suitable for deep sea environment |
| CN112083562A (en) * | 2020-08-14 | 2020-12-15 | 清华大学 | Off-axis two-mirror imaging system with real exit pupil |
| CN112180576A (en) * | 2020-09-02 | 2021-01-05 | 中国科学院西安光学精密机械研究所 | Refrigeration type free-form surface off-axis three-mirror optical system |
| TWI761114B (en) * | 2021-02-05 | 2022-04-11 | 鴻海精密工業股份有限公司 | Optical system with asymmetric freeform surfaces |
| CN114675415A (en) * | 2022-02-28 | 2022-06-28 | 南京航空航天大学 | Off-axis two-mirror optical system and design method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110927943A (en) * | 2019-12-26 | 2020-03-27 | 中国科学院长春光学精密机械与物理研究所 | Off-axis three-reflection diffuse reflection plate lighting system |
| CN111238449A (en) * | 2020-01-16 | 2020-06-05 | 中国科学院西安光学精密机械研究所 | Total reflection type underwater camera suitable for deep sea environment |
| CN112083562A (en) * | 2020-08-14 | 2020-12-15 | 清华大学 | Off-axis two-mirror imaging system with real exit pupil |
| CN112180576A (en) * | 2020-09-02 | 2021-01-05 | 中国科学院西安光学精密机械研究所 | Refrigeration type free-form surface off-axis three-mirror optical system |
| TWI761114B (en) * | 2021-02-05 | 2022-04-11 | 鴻海精密工業股份有限公司 | Optical system with asymmetric freeform surfaces |
| CN114879351A (en) * | 2021-02-05 | 2022-08-09 | 清华大学 | Asymmetrical free-form surface optical system |
| CN114675415A (en) * | 2022-02-28 | 2022-06-28 | 南京航空航天大学 | Off-axis two-mirror optical system and design method thereof |
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