CN107643595A - Secondary mirror light shield and square taper delustring cone design method based on space light trace - Google Patents
Secondary mirror light shield and square taper delustring cone design method based on space light trace Download PDFInfo
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Abstract
Secondary mirror light shield and square taper delustring cone design method, step based on space light trace include：(1) the Descartes's rectangular coordinate system established used in design process；(2) fill-in light line, the border of the side's of being calculated taper primary mirror centre bore delustring cone are established in meridian and sagittal surface；(3) position of the side's of determination taper primary mirror centre bore delustring cone end and configuration；(4) initial configuration of secondary mirror light shield is defined；(5) space auxiliary light, the position of the side's of being calculated taper delustring cone front end and configuration are built；(6) the set-point light cluster on the edge of circular conical surface, and ray tracing is carried out, the light source numbering of light leak can occur for statistics, and correspondingly increase the size of circular conical surface；(7) finally end and the final locus of front end and 3-d modelling are bored in the delustring of the side's of determination taper primary mirror centre bore；(8) 3-d modelling of secondary mirror light shield is calculated.
Description
Technical field
The present invention relates to the secondary mirror light shield based on space light trace and square taper delustring cone design method, suitable for each
In the secondary mirror light shield and square taper primary mirror of the coaxial reflecting system of class or all kinds of systems optical based on coaxial reflecting system
The design of heart hole delustring cone, belongs to Aid of Space Remote Sensing Technology field.
Background technology
The spuious Xanthophyll cycle structure design of space remote sensor optical system is indispensable during its development and production one
Important step, and the outer light shield of primary mirror, secondary mirror light shield and primary mirror centre bore delustring cone are all kinds of coaxial reflecting systems or each
The main and the most frequently used spuious Xanthophyll cycle structure of class optical system based on coaxial reflecting system.But traditional two dimension
Projection Design method has two：First, traditional design is carried out just for diagonal linear field, and optical system is not corresponded to
True visual field, therefore cause secondary mirror light shield size can be more than actual demand size, introduce unnecessary block；Two
It is that traditional design needs the outer light shield of extraordinary primary mirror to be coordinated with secondary mirror light shield, and light shield length has outside primary mirror
In limited time, need the secondary mirror light shield of oversize matched again.
The content of the invention
The technology of the present invention solves problem：Overcome the deficiencies in the prior art, there is provided a kind of based on space light trace
Secondary mirror light shield and square taper delustring cone design method, can truly reflect introduced by secondary mirror light shield, imaging light
The distribution situation of the shadow region border that can not be reached in three dimensions, avoiding traditional two-dimensional projection's design method can not
The drawbacks of true reflection space shadow region distribution situation, while coordinate the light scanning trace under low-angle, by means of gradually
The technology of iteration, joint complete the design of secondary mirror light shield and square taper primary mirror centre bore delustring cone, ensure that and calculate gained
Secondary mirror light shield size is minimum, introduce to block minimum, optical system imaging quality influence minimum, and cause once spuious
The elimination of light is no longer dependent on the outer light shield of primary mirror.
The technical scheme is that：A kind of secondary mirror light shield based on space light trace and square taper delustring cone design
Method, step are as follows：
(1) the Descartes's rectangular coordinate system established used in design process；
(2) fill-in light line is established in meridian and sagittal surface, based on the trace result of auxiliary light, the side's of being calculated taper
The border of primary mirror centre bore delustring cone；
(3) according to the optical structure design result of optical system, it is determined that the position of square taper primary mirror centre bore delustring cone end
Put and configuration；
(4) initial configuration of secondary mirror light shield is defined；
(5) space auxiliary light is built, based on the trace result and delustring cone space envelope of space auxiliary light, is calculated
Position and configuration to square taper delustring cone front end；
(6) the set-point light cluster on the edge of circular conical surface, and ray tracing is carried out, the light source of light leak can occur for statistics
Numbering, and correspondingly increase the size of circular conical surface；
(7) repeat step (5)~(6), until in the absence of light leak；Then the space polygon according to obtained by step (2) and
According to the space polygon obtained by step (5), the final sky of end and front end is bored in the finally side's of determination taper primary mirror centre bore delustring
Between position and 3-d modelling；
(8) auxiliary plane is established, the 3-d modelling of secondary mirror light shield is calculated.
The detailed process that the step (1) establishes Descartes's rectangular co-ordinate is：
11) origin of Descartes's rectangular coordinate system is arranged on to the summit of secondary mirror, while the normal on secondary mirror summit is defined
For Z axis；Provide that the positive of Z axis points to primary mirror center by secondary mirror summit；
12) by origin and vertical with Z axis, and the straight line in the optical system plane of symmetry is defined as Y-axis, it is specified that Y-axis
Forward direction it is consistent with the scanning direction of optical system；
13) it will cross origin and the straight line simultaneously vertical with Y-axis and Z axis is defined as X-axis, it is specified that X-direction in three dimensions
Meet right-handed system relation with Y, Z-direction；
14) the YZ plane definitions for determining Y, Z axis jointly are meridian plane, are by the XZ plane definitions that X, Z axis determine jointly
Sagittal surface.
The detailed process of the step (2) is：
21) establish in meridian plane positioned at entrance pupil+Y places and point to Y-direction maximum field of view and positioned at entrance pupil-Y places and point to Y side
It is auxiliary light Ray1 and Ray2 to two light of minimum visual field；
22) establish in sagittal surface positioned at entrance pupil+X places and point to X-direction maximum field of view and positioned at entrance pupil-X places and point to X side
It is auxiliary light Ray3 and Ray4 to two light of minimum visual field；
23) trace is carried out to auxiliary light Ray1, Ray2, Ray3 and Ray4, obtains this four auxiliary light via secondary mirror
Light after reflection is Ray1 ', Ray2 ', Ray3 ' and Ray4 ', and corresponding space line equation is l1', l2', l3' and l4'；
24) structure comprising straight line l3' and plane Plane1 perpendicular to sagittal surface, comprising straight line l1' and perpendicular to meridian
The plane Plane2 in face, the plane Plane3 comprising straight line l4' and perpendicular to sagittal surface, comprising straight line l2' and perpendicular to meridian
The plane Plane4 in face；The sky of plane Plane1, Plane2, the Plane3 and Plane4 side's of surrounding taper primary mirror centre bores delustring cone
Between envelope；
25) plane Plane1 with Plane2 meets at straight line L1, plane Plane2 and Plane3 meet at straight line L2, plane
Plane3 with Plane4 meets at straight line L3, plane Plane1 and Plane4 meet at straight line L4, then L1, L2, L3 and L4 are square taper
Four edges circle of primary mirror centre bore delustring cone.
The position of determination side's taper primary mirror centre bore delustring cone end and the specific method of configuration are in the step (3)：
It is Pr that note, which is located at the point nearest apart from the primary mirror back side on the outline of the mechanical-optical setup after primary mirror, and structure includes Pr and simultaneously vertical
In meridian plane and the plane Planer of sagittal surface；Planer and four edges circle L1, L2, L3 and L4 meet at respectively point Pr1, Pr2,
Pr3 and Pr4, then be sequentially connected with Pr1, Pr2, Pr3 and Pr4, that is, obtains quadrilateral space Pr1Pr2Pr3Pr4, the quadrilateral space
The locus of the side's of being exactly taper primary mirror centre bore delustring cone end and 3-d modelling.
The detailed process being defined in the step (4) to the initial configuration of secondary mirror light shield is：Secondary mirror light shield
Initial configuration is defined as a circular conical surface, the circular conical surface using the optical axis of optical system as symmetry axis, the osculum end of circular conical surface with time
Mirror connects, and size is identical with the clear aperture of secondary mirror；The big opening end of circular conical surface is relative with primary mirror, and its radius is more than osculum end
Radius.
In described step (4), the long L of secondary mirror light shield meets atan (0.1/L)>W, wherein w are that optical system is maximum
Diagonal linear field.
The detailed process of step (5) is：
51) define the big opening end of circular conical surface and meridian plane meets at point Psy+ and Psy- respectively, wherein Psy+ Y-coordinate value is big
In Psy- Y-coordinate value；The big opening end of circular conical surface meets at point Psx+ and Psx-, wherein Psx+ X-coordinate value respectively with sagittal surface
X-coordinate value more than Psx-；
52) the following 8 spaces auxiliary light of structure：
I) light Ray5 is aided in：Sent by the point Ps1 in circular conical surface big opening end Psx+ and Psy+ segmental arc while point to X side
To minimum visual field and Y-direction minimum visual field, reflected via primary mirror after intersect with envelope border L1；
J) light Ray6 is aided in：Sent by point Psy+, point to Y-direction minimum visual field；
K) light Ray7 is aided in：Sent by the point Ps2 in circular conical surface big opening end Psy+ and Psx- segmental arc while point to X side
To maximum field of view and Y-direction minimum visual field, reflected via primary mirror after intersect with envelope border L2；
L) light Ray8 is aided in：Sent by point Psx-, point to X-direction maximum field of view；
M) light Ray9 is aided in：Sent by the point Ps3 in circular conical surface big opening end Psx- and Psy- segmental arc while point to X side
To maximum field of view and Y-direction maximum field of view, reflected via primary mirror after intersect with envelope border L3；
N) light Ray10 is aided in：Sent by point Psy-, point to Y-direction maximum field of view；
O) light Ray11 is aided in：Sent by the point Ps4 in circular conical surface big opening end Psy- and Psx+ segmental arc while point to X side
To minimum visual field and Y-direction maximum field of view, reflected via primary mirror after intersect with envelope border L4；
P) light Ray12 is aided in：Sent by point Psx+, point to X-direction minimum visual field；
53) above-mentioned point Ps1, Psy+, Ps2, Psx-, Ps3, Psy-, Ps4, Psx+ are designated as point Psec (i) respectively, it is arrived
The distance of system optical axis is designated as R (i) respectively；Wherein i=1 ..., 8,
54) trace is carried out to auxiliary light Ray5~Ray12, Ray5 and envelope border L1 intersects at point Rf1, Ray6 with putting down
Face Plane1 intersect at point Rf2, Ray7 and envelope border L2 intersect at point Rf3, Ray8 and plane Plane2 intersect at point Rf4,
Ray9 and envelope border L3 intersects at point Rf5, Ray10 and plane Plane3 and intersects at point Rf6, Ray11 and envelope border L4 phases
Meet at point Rf7, Ray12 and plane Plane4 and intersect at point Rf8；
55) point Rf1~Rf8 is sequentially connected with, obtains space polygon Rf1Rf2Rf3Rf4Rf5Rf6Rf7Rf8, is side's cone
The locus of shape primary mirror centre bore delustring cone front end and 3-d modelling.
The detailed process of the step (6) is：It is being tried to achieve according to step (5) institute offer method, positioned at circular conical surface edge
On point Psec (i) place set 8 spot lights, 8 spot lights be designated as respectively GY (i) and by each spot light emergent ray
The center of front end 3-d modelling is bored in the delustring of angle center sensing side's taper primary mirror centre bore, and subtended angle is sized to the side's of covering taper primary mirror
The 3-d modelling of front end is bored in centre bore delustring；Ray tracing gradually is carried out to 8 light sources, if finding light leak, stops trace, record
Light source numbering i now, and increase point Psec (i) along circular conical surface and arrive R (i)=R (i) to the distance R (i) of system optical axis
+ △ R, △ R are the increased step-length of light shield size, 0.1mm≤△ R≤1mm.
The specific method that auxiliary plane is established in the step (8) is：
8 points of method determination are provided according to step (6), are defined respectively as 4 auxiliary planes：
E) point Psec (1), Psec (2), Psec (3) define plane PlaneUp, and the normal of the plane and Z axis Cheng Rui
Angle；
F) point Psec (3), Psec (4), Psec (5) define plane PlaneRt, and the normal of the plane and Z axis Cheng Rui
Angle；
G) point Psec (5), Psec (6), Psec (7) define plane PlaneDw, and the normal of the plane and Z axis Cheng Rui
Angle；
H) point Psec (7), Psec (8), Psec (1) define plane PlaneLt, and the normal of the plane and Z axis Cheng Rui
Angle.
The specific method for the 3-d modelling that secondary mirror light shield is calculated in the step (8) is：Use plane
PlaneUp, PlaneRt, PlaneDw, PlaneLt carry out boolean's removal to circular conical surface, you can obtain the three-dimensional of secondary mirror light shield
Configuration.
The present invention compared with prior art the advantages of be：
In optical system three dimensions, the initial position and inceptive direction of 12 auxiliary light are defined, according to auxiliary
The result of ray tracing defines the border for the three-dimensional shadow region that introduced by secondary mirror light shield, imaging light can not reach,
Again by the method for iterative calculation, the design of the square taper primary mirror centre bore delustring cone of maximized size is completed.Meanwhile structure 4
Individual auxiliary plane, and Boolean calculation is carried out with circular conical surface, so that it is determined that the 3-d modelling of secondary mirror light shield.
12 in space auxiliary light and the shadow region that circular conical surface introduces are closely related, can truly reflect it
Distribution in three dimensions, avoid some disadvantages of the conventional method only calculated in one dimension of diagonal
End, it ensure that tight fit that the minimum of secondary mirror light shield size, secondary mirror light shield are bored with delustring etc..
Secondary mirror light shield and square taper delustring cone design method based on space light trace are applied to all kinds of coaxial reflections
System or the design that the secondary mirror light shield of optical system and delustring are bored based on coaxial reflecting system, overcome traditional two dimension
Projection Design method needs the shortcomings that outer light shield of oversize primary mirror or mutual oversize secondary mirror light shield, so as to get secondary
The size of mirror light shield realizes minimum, not only contributes to the mitigation of system overall weight and the reduction of volume, Er Qieyou
Help blocking for reduction system, retain pass letter to greatest extent.
Brief description of the drawings
The secondary mirror light shield and square taper primary mirror centre bore delustring cone co-design flow chart that Fig. 1 is carried by invention；
Descartes's rectangular coordinate system schematic diagram that Fig. 2 is established by invention when being calculated；
Fig. 3 is that invention is 4 auxiliary ray tracings that calculating side's taper primary mirror centre bore delustring cone envelope is carried out；
Fig. 4 is that invention is to determine 8 auxiliary ray tracings that secondary mirror light shield shadow region boundary position is carried out；
Fig. 5 is the final design result of inventive embodiments 1.
Embodiment
To visible spectrum, X-direction visual field is ± 1.0 °, and Y-direction visual field is -1~-0.6 °, Entry pupil diameters 359.6mm's
RC systems carry out the co-design of secondary mirror light shield and square taper primary mirror centre bore delustring cone.
As shown in figure 1, the present invention's comprises the following steps that：
(1) according to shown in Fig. 2, establishing Descartes's rectangular coordinate system；
(2) the trace result based on 4 auxiliary light in meridian and sagittal surface, the side's of calculating taper primary mirror centre bore delustring
The border of cone
Structure 4 auxiliary light R1, R2, R3 and R4 as shown in Figure 3, its equation are respectively：
In Fred to 4 auxiliary light carry out traces, obtain the linear equation l1' after 4 light reflect via secondary mirror,
L2', l3' and l4' are respectively：
According to l1', l2', l3' and l4' result, envelope border L1, L2, L3 and L4 calculating is completed, wherein during,
Solution of structure and plane intersection line of plane etc. is known space geometry knowledge, and final L1, L2, L3 and L4 equation are as follows：
(3) ball solution being capable of the locus of the side's of definition taper primary mirror centre bore delustring cone end and 4 points of 3-d modelling
The optic-mechanical design result of optical system is measured in PROE, the Z coordinate for obtaining Pr points is 187, then plane
Planer equation is：
0x+0y+c-187=0
Calculation Plane Planer and straight line L1, L2, L3 and L4 intersection point Pr1, Pr2, Pr3 and Pr4 be respectively：
(14.7644071614553,-7.47574665690518,187)
(-14.7644071614552,-7.47574665690518,187)
(-14.7644071614552,-14.8536246486155,187)
(14.7644071614553,-14.8536246486155,187)
Then it is sequentially connected with Pr1, Pr2, Pr3 and Pr4, that is, the side's of obtaining taper primary mirror centre bore delustring cone end locus
And 3-d modelling.
(4) circular conical surface is defined
The summit of the circular conical surface is (0,0, -49.1290610932087), and osculum end radius is
22.2273801254413mm big opening end radius is 37mm
(5) trace result and plane Plane1, Plane2, Plane3 and Plane4 based on 8 auxiliary light in space,
The position of the side of calculating taper delustring cone front end and configuration
8 as shown in Figure 4 auxiliary light Ray5~Ray12 of structure, and trace is carried out to it, 8 auxiliary light via
Primary mirror reflection after equation be respectively：
According to known space geometry knowledge, point Rf1~Rf8 coordinate is tried to achieve, it is as follows：
(17.6109270417317,3.44372059675562,105.512460592402)
(1.00031145903751E-14,10.4474962170756,53.2461339846212)
(-17.610927694701,3.44371979500508,105.512463140638)
(-17.7746397608101,2.07876070115578,100.825866692243)
(-16.7806924547197,-16.8442148405053,129.279683133295)
(9.52712646488059E-15,-18.6205605552752,77.7717243685761)
(16.7806919591134,-16.8442142196468,129.279677996644)
(17.7746397608104,-2.07876070115577,100.825866692245)
Point Rf1~Rf8 is sequentially connected with, obtains space polygon Rf1Rf2Rf3Rf4Rf5Rf6Rf7Rf8, as square taper
The locus of primary mirror centre bore delustring cone front end and 3-d modelling.
(6) spot light on circular conical surface edge is set, and carries out ray tracing, the numbering and phase of light leak light source occur for record
Answer the size of ground increase circular conical surface
The coordinate that Psec (i) (i=1 ..., 8) is calculated is respectively：
(26.8328283030529,7.99995782856913,18.8437864653436)
(0,28,18.8437864653436)
(-26.8328283030529,7.99995782856913,18.8437864653436)
(-28,0,18.8437864653436)
(-21.8665281099613,-17.4887091695263,18.8437864653436)
(0,-28,18.8437864653436)
(21.8665282556935,-17.488708987314,18.8437864653436)
(28,->0,18.8437864653436)
Light source GY (i) (i=1 ... 8) is set, and carries out ray tracing, whether statistics occurs light leak, is leaked if crossed
Light then correspondingly increases the size of circular conical surface, and repeats the step (5) in embodiment, starts if light leak does not occur
Step (7) in embodiment.
(7) 3-d modelling of secondary mirror light shield is mainly to carry out boolean's fortune by 4 auxiliary planes of circular conical surface and structure
Obtain
The equation that 4 auxiliary planes PlaneUp, PlaneRt, PlaneDw, PlaneLt are calculated is respectively：
8.37E-08* (x-6.91E-09)+33.81* (y-0.82) -33.81* (z-0.49)=0
- 33.07* (x+0.33) -33.81* (y+1.39E-02) -29.39* (z-0.38)=0
5.09E-08* (x-3.08E-09) -29.39* (y+0.97)+29.39* (z-0.15)=0
33.07* (x-0.33)+29.39* (y+1.39E-02)+33.81* (z-0.38)=0
Boolean is carried out for circular conical surface with four planes and remove division operation, obtain the locus of secondary mirror light shield and three-dimensional structure
Type.The co-design of secondary mirror light shield and square taper primary mirror centre bore delustring cone is completed above, and design result is as shown in Figure 5.
Claims (10)
1. a kind of secondary mirror light shield based on space light trace and square taper delustring cone design method, it is characterised in that step is such as
Under：
(1) the Descartes's rectangular coordinate system established used in design process；
(2) fill-in light line is established in meridian and sagittal surface, based on the trace result of auxiliary light, the side's of being calculated taper primary mirror
The border of centre bore delustring cone；
(3) according to the optical structure design result of optical system, it is determined that the position of square taper primary mirror centre bore delustring cone end and
Configuration；
(4) initial configuration of secondary mirror light shield is defined；
(5) space auxiliary light is built, based on the trace result and delustring cone space envelope of space auxiliary light, the side of being calculated
The position of taper delustring cone front end and configuration；
(6) the set-point light cluster on the edge of circular conical surface, and ray tracing is carried out, the light source that light leak can occur for statistics is compiled
Number, and correspondingly increase the size of circular conical surface；
(7) repeat step (5)~(6), until in the absence of light leak；Then the space polygon according to obtained by step (2) and according to
The final space bit of end and front end is bored in space polygon obtained by step (5), the finally side's of determination taper primary mirror centre bore delustring
Put and 3-d modelling；
(8) auxiliary plane is established, the 3-d modelling of secondary mirror light shield is calculated.
2. the secondary mirror light shield according to claim 1 based on space light trace and square taper delustring cone design method,
It is characterized in that：The detailed process that the step (1) establishes Descartes's rectangular co-ordinate is：
11) origin of Descartes's rectangular coordinate system is arranged on to the summit of secondary mirror, while the normal on secondary mirror summit is defined as Z
Axle；Provide that the positive of Z axis points to primary mirror center by secondary mirror summit；
12) by origin and vertical with Z axis, and the straight line in the optical system plane of symmetry be defined as Y-axis, it is specified that Y-axis just
To consistent with the scanning direction of optical system；
13) it will cross origin and the straight line simultaneously vertical with Y-axis and Z axis is defined as X-axis, it is specified that X-direction and Y, Z in three dimensions
Direction of principal axis meets right-handed system relation；
14) the YZ plane definitions for determining Y, Z axis jointly are meridian plane, and the XZ plane definitions that X, Z axis are determined jointly are the sagitta of arc
Face.
3. the secondary mirror light shield according to claim 2 based on space light trace and square taper delustring cone design method,
It is characterized in that：The detailed process of the step (2) is：
21) establish in meridian plane positioned at entrance pupil+Y places and point to Y-direction maximum field of view and positioned at entrance pupil-Y places and point to Y-direction most
Two light of small field of view are auxiliary light Ray1 and Ray2；
22) establish in sagittal surface positioned at entrance pupil+X places and point to X-direction maximum field of view and positioned at entrance pupil-X places and point to X-direction most
Two light of small field of view are auxiliary light Ray3 and Ray4；
23) trace is carried out to auxiliary light Ray1, Ray2, Ray3 and Ray4, obtains this four auxiliary light and reflected via secondary mirror
Light afterwards is Ray1 ', Ray2 ', Ray3 ' and Ray4 ', and corresponding space line equation is l1', l2', l3' and l4'；
24) structure comprising straight line l3' and plane Plane1 perpendicular to sagittal surface, comprising straight line l1' and perpendicular to meridian plane
Plane Plane2, the plane Plane3 comprising straight line l4' and perpendicular to sagittal surface, comprising straight line l2' and perpendicular to meridian plane
Plane Plane4；The space bag of plane Plane1, Plane2, the Plane3 and Plane4 side's of surrounding taper primary mirror centre bores delustring cone
Network；
25) plane Plane1 and Plane2 meet at straight line L1, plane Plane2 and Plane3 meet at straight line L2, plane Plane3 and
Plane4 meets at straight line L3, plane Plane1 and Plane4 meet at straight line L4, then L1, L2, L3 and L4 are square taper primary mirror center
Four edges circle of hole delustring cone.
4. the secondary mirror light shield according to claim 3 based on space light trace and square taper delustring cone design method,
It is characterized in that：The specific method of the position of determination side's taper primary mirror centre bore delustring cone end and configuration in the step (3)
For：It is Pr that note, which is located at the point nearest apart from the primary mirror back side on the outline of the mechanical-optical setup after primary mirror, and structure includes Pr and simultaneously
Perpendicular to meridian plane and the plane Planer of sagittal surface；Planer and four edges circle L1, L2, L3 and L4 meet at respectively point Pr1,
Pr2, Pr3 and Pr4, then be sequentially connected with Pr1, Pr2, Pr3 and Pr4, that is, obtains quadrilateral space Pr1Pr2Pr3Pr4, the space four
The locus of the side shape side of being exactly taper primary mirror centre bore delustring cone end and 3-d modelling.
5. the secondary mirror light shield according to claim 4 based on space light trace and square taper delustring cone design method,
It is characterized in that：The detailed process being defined in the step (4) to the initial configuration of secondary mirror light shield is：Secondary mirror light shield
Initial configuration be defined as a circular conical surface, the circular conical surface using the optical axis of optical system as symmetry axis, the osculum end of circular conical surface with
Secondary mirror connects, and size is identical with the clear aperture of secondary mirror；The big opening end of circular conical surface is relative with primary mirror, and its radius is more than osculum
Hold radius.
6. the secondary mirror light shield according to claim 5 based on space light trace and square taper delustring cone design method,
It is characterized in that：In described step (4), the long L of secondary mirror light shield meets atan (0.1/L)>W, wherein w be optical system most
Big diagonal linear field.
7. secondary mirror light shield based on space light trace and square taper delustring cone design side according to claim 5 or 6
Method, it is characterised in that：The detailed process of step (5) is：
51) define the big opening end of circular conical surface and meridian plane meets at point Psy+ and Psy- respectively, wherein Psy+ Y-coordinate value is more than
Psy- Y-coordinate value；The big opening end of circular conical surface meets at point Psx+ and Psx- respectively with sagittal surface, and wherein Psx+ X-coordinate value is big
In Psx- X-coordinate value；
52) the following 8 spaces auxiliary light of structure：
A) light Ray5 is aided in：Sent by the point Ps1 in circular conical surface big opening end Psx+ and Psy+ segmental arc while point to X-direction most
Small field of view and Y-direction minimum visual field, intersect after being reflected via primary mirror with envelope border L1；
B) light Ray6 is aided in：Sent by point Psy+, point to Y-direction minimum visual field；
C) light Ray7 is aided in：Sent by the point Ps2 in circular conical surface big opening end Psy+ and Psx- segmental arc while point to X-direction most
Big visual field and Y-direction minimum visual field, intersect after being reflected via primary mirror with envelope border L2；
D) light Ray8 is aided in：Sent by point Psx-, point to X-direction maximum field of view；
E) light Ray9 is aided in：Sent by the point Ps3 in circular conical surface big opening end Psx- and Psy- segmental arc while point to X-direction most
Big visual field and Y-direction maximum field of view, intersect after being reflected via primary mirror with envelope border L3；
F) light Ray10 is aided in：Sent by point Psy-, point to Y-direction maximum field of view；
G) light Ray11 is aided in：Sent by the point Ps4 in circular conical surface big opening end Psy- and Psx+ segmental arc while point to X-direction most
Small field of view and Y-direction maximum field of view, intersect after being reflected via primary mirror with envelope border L4；
H) light Ray12 is aided in：Sent by point Psx+, point to X-direction minimum visual field；
53) above-mentioned point Ps1, Psy+, Ps2, Psx-, Ps3, Psy-, Ps4, Psx+ are designated as point Psec (i) respectively, it arrives optics
The distance of systematic optical axis is designated as R (i) respectively；Wherein i=1 ..., 8,
54) trace is carried out to auxiliary light Ray5~Ray12, Ray5 and envelope border L1 intersects at point Rf1, Ray6 and plane
Plane1 intersect at point Rf2, Ray7 and envelope border L2 intersect at point Rf3, Ray8 and plane Plane2 intersect at point Rf4,
Ray9 and envelope border L3 intersects at point Rf5, Ray10 and plane Plane3 and intersects at point Rf6, Ray11 and envelope border L4 phases
Meet at point Rf7, Ray12 and plane Plane4 and intersect at point Rf8；
55) point Rf1~Rf8 is sequentially connected with, obtains space polygon Rf1Rf2Rf3Rf4Rf5Rf6Rf7Rf8, as square taper master
The locus of mirror centre bore delustring cone front end and 3-d modelling.
8. the secondary mirror light shield according to claim 7 based on space light trace and square taper delustring cone design method,
It is characterized in that：The detailed process of the step (6) is：It is being tried to achieve according to step (5) institute offer method, positioned at circular conical surface side
8 spot lights are set along upper point Psec (i) place, 8 spot lights are designated as GY (i) and by each spot light emergent ray respectively
The center of front end 3-d modelling is bored in the delustring of subtended angle center sensing side's taper primary mirror centre bore, and subtended angle is sized to the side's of covering taper master
The 3-d modelling of front end is bored in the delustring of mirror centre bore；Ray tracing gradually is carried out to 8 light sources, if finding light leak, stops trace, note
The light source numbering i of record now, and increase point Psec (i) along circular conical surface and arrive R (i)=R to the distance R (i) of system optical axis
(i)+△ R, △ R are the increased step-length of light shield size, 0.1mm≤△ R≤1mm.
9. the secondary mirror light shield according to claim 8 based on space light trace and square taper delustring cone design method,
It is characterized in that：The specific method that auxiliary plane is established in the step (8) is：
8 points of method determination are provided according to step (6), are defined respectively as 4 auxiliary planes：
A) point Psec (1), Psec (2), Psec (3) define plane PlaneUp, and the normal of the plane and Z axis are at an acute angle；
B) point Psec (3), Psec (4), Psec (5) define plane PlaneRt, and the normal of the plane and Z axis are at an acute angle；
C) point Psec (5), Psec (6), Psec (7) define plane PlaneDw, and the normal of the plane and Z axis are at an acute angle；
D) point Psec (7), Psec (8), Psec (1) define plane PlaneLt, and the normal of the plane and Z axis are at an acute angle.
10. the secondary mirror light shield according to claim 9 based on space light trace and square taper delustring cone design method,
It is characterized in that：The specific method for the 3-d modelling that secondary mirror light shield is calculated in the step (8) is：Use plane
PlaneUp, PlaneRt, PlaneDw, PlaneLt carry out boolean's removal to circular conical surface, you can obtain the three-dimensional of secondary mirror light shield
Configuration.
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