CN103969787A - Initial assembly positioning method for four off-axis lenses - Google Patents
Initial assembly positioning method for four off-axis lenses Download PDFInfo
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- CN103969787A CN103969787A CN201410219039.2A CN201410219039A CN103969787A CN 103969787 A CN103969787 A CN 103969787A CN 201410219039 A CN201410219039 A CN 201410219039A CN 103969787 A CN103969787 A CN 103969787A
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Abstract
Disclosed is an initial assembly positioning method for four off-axis lenses. The four off-axis lenses include the main mirror, the secondary mirror, the third mirror and the plane mirror, wherein the main mirror and the third mirror are off-axis aspheric mirrors. A zero compensator is utilized for calibrating the direction of the optical axes of the off-axis mirrors. The reference is provided for adjusting the space positions of the mirrors through four-rod positioning. Initial assembly positioning of the mirror assembly is achieved through multi-theodolite networking. According to the initial assembly positioning method for the four off-axis lenses, by the combination of the optical axis introduction and four-rod positioning technology, the certain precision of the initial assembly of the four off-axis lenses is achieved, and a reasonable initial point is built for optical system computer-assisted adjustment.
Description
Technical field
The invention belongs to camera lens debug with detection technique field in, relate to a kind of first assembling and positioning method from axle four anti-camera lenses.
Background technology
Along with widespread use and the develop rapidly of space optical remote sensor, large-caliber off-axis optical system has without central shielding because of it, and capacity usage ratio is high, can realize large visual field and the higher features such as ground resolution are widely used.At present to generally adopting area of computer aided integration techno logy from debuging of axle optical lens, the wave aberration of auto-interference method real-time detecting system, area of computer aided is debug software analysis interference fringe, solve the multinomial coefficient on corrugated, what provide each optical element debugs direction and quantized value, instructs to revise each elements relative site error and reach final design requirement.
For debuging of traditional Homology of Sphere formula optical system and coaxial total-reflection type aspheric optical system, can utilize comparatively ripe centering assembly technology, thereby special-purpose image of spherical center centrescope can be measured the centering that offset is realized spherical optics part accurately, then a plurality of optical elements is strictly assembled according to the consistance of optical axis.
Owing to itself just there is no symmetry physically after the moulding of the anti-camera lens parts of axle four, simultaneously higher toward contact to the tolerance of system, consider that off axis reflector mirror is as the part in female mirror, cannot accurately determine the optical axis of catoptron by the tradition technique of feeling relieved; And off axis reflector mirror virtual vertex brings difficulty to each mirror locus adjustment simultaneously, thereby cause just after dress, having larger misalignment rate from the anti-camera lens of axle four, test will be very large with the deviation of Computer Simulation result so, cause the effect of adjustment to restrain, cause area of computer aided to debug inefficacy.
Summary of the invention
The technical matters that the present invention solves is: overcome the deficiencies in the prior art, a kind of first assembling and positioning method from axle four anti-camera lenses is provided, from the anti-camera lens of the axle four first dress stage to optical axis, off-axis angle, effectively control from axle amount and mirror spacing, greatly improved optical system and just filled positioning precision, for next step area of computer aided precision, debug and create conditions.
Technical solution of the present invention: a kind of first assembling and positioning method from axle four anti-camera lenses, described comprises principal reflection mirror, secondary mirror, the 3rd catoptron, plane mirror from the anti-camera lens of axle four, and wherein principal reflection mirror and the 3rd catoptron are off-axis aspheric surface catoptron; Step is as follows:
1) utilize the first interferometer, zero compensation machine that the optical axis direction of principal reflection mirror is drawn; If it is positive that beam incident surface is principal reflection mirror, utilize two transit intersection docking to measure and obtain the optical axis direction of principal reflection mirror and the angle α of principal reflection mirror back side normal direction;
2) utilize the first interferometer, zero compensation machine that the optical axis direction of the 3rd catoptron is drawn; If it is positive that beam incident surface is the 3rd catoptron, utilize two transit intersection docking to measure and obtain the optical axis direction of the 3rd catoptron and the angle β of the 3rd mirror back surface normal direction;
3) by calculating and make four stocks from the optical design data of axle four anti-camera lenses, the low-expansion quartz glass of stock material selection, bulb-shaped is all made in four terminations of four stocks, and four bulb positions represent respectively the minute surface center of incident field of view center position, principal reflection mirror, the minute surface center of the minute surface center of secondary mirror and the 3rd catoptron;
4) four stocks are placed on adjusting pole, adjust the height of incident field of view center point and secondary mirror central point, determine the sagittal surface of visual field, center, secondary mirror is as benchmark, adjust successively principal reflection mirror and the 3rd catoptron, until each mirror mirror center contact stock bulb;
5) establishing beam incident surface is that principal reflection mirror is positive, sets up two transit intersection docking and measures the angle α that obtains the second interferometer standard flat mirror and principal reflection mirror back side normal direction
1, adjust principal reflection mirror and make α
1with step 1) in α consistent;
6) establishing beam incident surface is that the 3rd catoptron is positive, sets up two transit intersection docking and measures the angle β that obtains the second interferometer standard flat mirror and the 3rd mirror back surface normal direction
1, adjust the 3rd catoptron and make β
1with step 2) in β consistent;
7) directional light that the second interferometer sends is after the principal reflection mirror from axle four anti-camera lenses, secondary mirror, the 3rd catoptron, plane mirror, after converging to standard spherical mirror, return and form interference fringe at the second interferometer, completing from the anti-first position that sets of axle four.
Step 1) concrete grammar that in, optical axis direction is drawn is: by the first interferometer, zero compensation machine and principal reflection mirror are placed from left to right successively, the plane wave of the first interferometer outgoing becomes aspherical wavefront through zero compensation machine, aspherical wavefront returns according to former road after by primary mirror reflects, after zero compensation machine, get back to again the first interferometer, adjust the position of zero compensation machine and principal reflection mirror, until the numerical value that the first interferometer measurement obtains equates with the face parameter numerical value of principal reflection mirror, the position of fixed zero compensator and principal reflection mirror, now the optical axis of principal reflection mirror is parallel with the first interferometer emergent light direction.
Step 2) concrete grammar that in, optical axis direction is drawn is: by the first interferometer, zero compensation machine and the 3rd catoptron are placed from left to right successively, the plane wave of the first interferometer outgoing becomes aspherical wavefront through zero compensation machine, aspherical wavefront returns according to former road after being reflected by the 3rd catoptron, after zero compensation machine, get back to again the first interferometer, adjust the position of zero compensation machine and the 3rd catoptron, until the numerical value that the first interferometer measurement obtains equates with the face parameter numerical value of the 3rd catoptron, the position of fixed zero compensator and the 3rd catoptron, now the optical axis of the 3rd catoptron is parallel with the first interferometer emergent light direction.
The present invention's good effect is compared with prior art: owing to itself just there is no symmetry physically after the moulding of the anti-camera lens parts of axle four, virtual vertex brings difficulty to each mirror locus adjustment.Therefore, from the anti-lens optical system of axle four, carrying out proposing to utilize four bar location and many transit network-building methods to adjust the locus of each catoptron in body frame before area of computer aided is debug, thereby make the first dress position fixing process of large-caliber off-axis four anti-camera lenses visual under theoretical direction, quantitatively, complete in an orderly manner, realized mirror spacing, optical axis direction and from control and the accurate adjustment of axle amount, improved the positioning precision of putting from each catoptron locus in the anti-camera lens of axle four, make high precision interferometer accurately detection optical system picture element be that area of computer aided is debug algorithm and set up a rational starting point, thereby effectively improved, debug efficiency.Meanwhile, this scheme is also adapted to all first positions that set from axle four anti-camera lenses.
Accompanying drawing explanation
Fig. 1 is that off-axis aspheric surface zero compensation machine optical axis draws schematic diagram outward;
Fig. 2 is that four bar location and optical axis are adjusted schematic diagram.
Embodiment
A kind of first assembling and positioning method from axle four anti-camera lenses of the present invention, described comprises principal reflection mirror 4, secondary mirror 5, the 3rd catoptron 6, plane mirror 7 from the anti-camera lens of axle four, wherein principal reflection mirror 4 and the 3rd catoptron 6 are off-axis aspheric surface catoptron 3; Below in conjunction with Fig. 1-Fig. 2 to of the present invention from the anti-camera lens of axle four just set position embodiment elaborate:
Interferometer 1 sends a branch of plane wave and becomes required aspherical wavefront through zero compensation machine 2, and aspherical wavefront returns according to former road after being reflected by off-axis aspheric surface catoptron, through zero compensation machine, gets back to interferometer.As shown in Figure 1, the optical path adjusting of compensator and interferometer is to strictly parallel (precision is controlled 10 " in); repeatedly regulate the orientation of off-axis aspheric surface catoptron until the numerical value measuring equates with the face parameter numerical value of off-axis aspheric surface catoptron, now the optical axis coincidence of the primary optical axis of off-axis aspheric surface catoptron and compensator, interferometer.Two transit intersection interoperability tests are guided to mirror back surface reference field by off-axis aspheric surface mirror optical axis direction.Due to compensator self assembly precision, detect light path alignment error and intersection measurement error etc. cause optical axis draw precision be about 1 '.
1) utilize the first interferometer 1, zero compensation machine 2 that the optical axis direction of principal reflection mirror 6 is drawn; If beam incident surface is principal reflection mirror 4 fronts, utilize two transit intersection docking to measure and obtain the optical axis direction of principal reflection mirror 4 and the angle α of principal reflection mirror 4 back side normal directions,
2) utilize the first interferometer 1, zero compensation machine 2 that the optical axis direction of the 3rd catoptron 6 is drawn; If beam incident surface is the 3rd catoptron 6 fronts, utilizes two transits (T1, T2) intersection docking to measure and obtain the optical axis direction of the 3rd catoptron 6 and the angle β of the 3rd catoptron 6 back side normal directions;
3) body frame is positioned on two dimension adjustment platform 10, secondary mirror 5 is arranged in body frame as benchmark, angle between two transit intersection measurement the second interferometer standard flats 8 and secondary mirror 5, by rotation, adjusting platform 10, to make angle be between the two Φ, thereby optical axis is caused to standard flat catoptron 8 outward.
4) four end points (A, B, C, D) of choosing four stocks represent respectively the minute surface center of incident visual field, principal reflection mirror 4, secondary mirror 5 and the 3rd catoptron 6.According to optical system data, import PRE Structure Design Software, calculated theoretical length and the angle of four bars by each mirror mirror center, material is low-expansion quartz glass, and bulb is made at two ends.
5) as shown in Figure 2, four bars are placed on adjusting pole, if the second interferometer beam plane of incidence is principal reflection mirror 6 fronts, laser instrument 11 sends beam of laser through terminal A and terminal B, adjusting four bars makes AB line parallel with the second interferometer standard flat mirror normal direction, then, adjust incident field of view center point A consistent with the height of secondary mirror 5 central point C, thereby determine the sagittal surface of visual field, center, adjust successively principal reflection mirror 4, secondary mirror 5 and the 3rd catoptron 6, until contact position B, C, D.
6) set up three transits (T3, T4, T5) the autocollimatic principal reflection mirror back side, the 3rd mirror back surface and interferometer standard flat catoptron respectively, adjust principal reflection mirror 4 and the 3rd catoptron 6 inclinations and pitching each mirror optical axis direction is overlapped with systematic optical axis direction.If beam incident surface is principal reflection mirror 4 fronts, sets up two transits (T4, T5) intersection docking and measure the angle α that obtains the second interferometer standard flat mirror 8 and principal reflection mirror 4 back side normal directions
1, adjust principal reflection mirror 4 and make α
1consistent with the α in step 1; Set up two transits (T3, T5) intersection docking and measure the angle β that obtains the second interferometer standard flat mirror 8 and the 3rd catoptron 6 back side normal directions
1, adjust the 3rd catoptron 6 and make β
1with step 2) in β consistent;
7) adopt auto-interference measuring system to detect in real time the wave aberration from axle four anti-camera lenses, as shown in Figure 2, the second interferometer 8 sends directional light process from the anti-camera lens principal reflection mirror 4 of axle four, secondary mirror 5, the 3rd catoptron 6 and plane mirror 7, converge to the former road of standard spherical mirror 9 and return to formation interference fringe, it is 0.263 λ (λ=632.8nm) that high precision interferometer records the first root-mean-square value (RMS value) that sets a rear system aberration, then through four area of computer aided, debugs each visual field picture element and meets the demands.Facts have proved this scheme to there is very high positioning precision to make to adjust speed of convergence very fast, effectively improved and debug efficiency, shortened the cycle of debuging.
The content not being described in detail in instructions of the present invention belongs to those skilled in the art's known technology.
Claims (3)
1. the first assembling and positioning method from axle four anti-camera lenses, described comprises principal reflection mirror (4), secondary mirror (5), the 3rd catoptron (6), plane mirror (7) from the anti-camera lens of axle four, and wherein principal reflection mirror (4) and the 3rd catoptron (6) are off-axis aspheric surface catoptron (3); It is characterized in that comprising the following steps:
1) utilize the first interferometer (1), zero compensation machine (2) that the optical axis direction of principal reflection mirror (4) is drawn; If beam incident surface is principal reflection mirror (4) front, utilizes two transit intersection docking to measure and obtain the optical axis direction of principal reflection mirror (4) and the angle α of principal reflection mirror (4) back side normal direction;
2) utilize the first interferometer (1), zero compensation machine (2) that the optical axis direction of the 3rd catoptron (6) is drawn; If beam incident surface is the 3rd catoptron (6) front, utilizes two transit intersection docking to measure and obtain the optical axis direction of the 3rd catoptron (6) and the angle β of the 3rd catoptron (6) back side normal direction;
3) by calculating and make four stocks from the optical design data of axle four anti-camera lenses, the low-expansion quartz glass of stock material selection, bulb-shaped is all made in four terminations of four stocks, and four bulb positions represent respectively the minute surface center of the minute surface center of incident field of view center position, principal reflection mirror (4), the minute surface center of secondary mirror (5) and the 3rd catoptron (6);
4) four stocks are placed on adjusting pole, adjust the height of incident field of view center point and secondary mirror (5) central point, determine the sagittal surface of visual field, center, secondary mirror (5) is as benchmark, adjust successively principal reflection mirror (4) and the 3rd catoptron (6), until each mirror mirror center contact stock bulb;
5) establishing beam incident surface is principal reflection mirror (4) front, sets up two transit intersection docking and measures the angle α that obtains the second interferometer standard flat mirror (8) and principal reflection mirror (4) back side normal direction
1, adjust principal reflection mirror (4) and make α
1with step 1) in α consistent;
6) establishing beam incident surface is the 3rd catoptron (6) front, sets up two transit intersection docking and measures the angle β that obtains the second interferometer standard flat mirror (8) and the 3rd catoptron (6) back side normal direction
1, adjust the 3rd catoptron (6) and make β
1with step 2) in β consistent;
7) directional light that the second interferometer (8) sends is after the principal reflection mirror from axle four anti-camera lenses (4), secondary mirror (5), the 3rd catoptron (6), plane mirror (7), after converging to standard spherical mirror (9), return and form interference fringe at the second interferometer (8), completing from the anti-first position that sets of axle four.
2. a kind of method that sets position from axle four anti-camera lenses first according to claim 1, it is characterized in that: step 1) in the optical axis direction concrete grammar of drawing be: by the first interferometer (1), zero compensation machine (2) and principal reflection mirror (4) are placed from left to right successively, the plane wave of the first interferometer (1) outgoing becomes aspherical wavefront through zero compensation machine (2), aspherical wavefront returns according to former road after being reflected by principal reflection mirror (4), after zero compensation machine (2), get back to again the first interferometer (1), adjust the position of zero compensation machine (2) and principal reflection mirror (4), until the numerical value that the first interferometer (1) measures equates with the face parameter numerical value of principal reflection mirror (4), the position of fixed zero compensator (2) and principal reflection mirror (4), now the optical axis of principal reflection mirror (4) is parallel with the first interferometer (1) emergent light direction.
3. a kind of method that sets position from axle four anti-camera lenses first according to claim 1, it is characterized in that: step 2) in the optical axis direction concrete grammar of drawing be: by the first interferometer (1), zero compensation machine (2) and the 3rd catoptron (6) are placed from left to right successively, the plane wave of the first interferometer (1) outgoing becomes aspherical wavefront through zero compensation machine (2), aspherical wavefront returns according to former road after being reflected by the 3rd catoptron (6), after zero compensation machine (2), get back to again the first interferometer (1), adjust the position of zero compensation machine (2) and the 3rd catoptron (6), until the numerical value that the first interferometer (1) measures equates with the face parameter numerical value of the 3rd catoptron (6), the position of fixed zero compensator (2) and the 3rd catoptron (6), now the optical axis of the 3rd catoptron (6) is parallel with the first interferometer (1) emergent light direction.
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