CN106323599B - Method for detecting imaging quality of large-field telescope optical system - Google Patents
Method for detecting imaging quality of large-field telescope optical system Download PDFInfo
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- CN106323599B CN106323599B CN201610707394.3A CN201610707394A CN106323599B CN 106323599 B CN106323599 B CN 106323599B CN 201610707394 A CN201610707394 A CN 201610707394A CN 106323599 B CN106323599 B CN 106323599B
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- 238000003384 imaging method Methods 0.000 title claims abstract description 24
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- 238000005259 measurement Methods 0.000 claims abstract description 10
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- 238000011084 recovery Methods 0.000 abstract description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention relates to a method for detecting the imaging quality of an optical system of a large-field telescope, which comprises the following steps: the first step is as follows: calibrating a reference view field; the second step is that: measuring the change of a view field, and adjusting the emergent angle of the parallel light source (1); the third step: the wavefront detector (4) is positioned, and the position and the posture of the six-dimensional moving table (5) are adjusted according to a positioning closed-loop structure until the wavefront detector (4) and the large-field telescope (6) to be detected are in a confocal position; the fourth step: detecting the imaging quality, namely obtaining the imaging quality of the detected large-field telescope (6) by utilizing a wavefront recovery algorithm according to the measurement data of the wavefront detector (4); and repeating the second step to the fourth step until the detection of the full field range is completed. The invention solves the problem of detecting the imaging quality of the large-field telescope optical system, overcomes the defect that the imaging quality of the full field is approximately expressed by the imaging quality of the central field at present, realizes the automatic detection of the full field and improves the detection accuracy.
Description
Technical field
The invention belongs to photo-electric telescope detection technique field, more particularly to a kind of Large Area Telescope optical system imaging
The detection method of quality.
Background technology
Optical telescope is the important scientific equipment of human cognitive space, and scientists are for different observation and research mesh
The important indicators such as the bore of optical telescope, focal length, service band, visual field, image quality are proposed higher want by mark
It asks.Big visual field optical telescope can obtain more celestial informations within certain astronomical observation time, improve using effect
Rate is constantly subjected to the favor of scientist and astronomical observation person.
Currently, optical telescope generally use Cassegrain or Gregory system, its resolving power is higher, image quality
Reach diffraction limit rank, but visual field is limited, the image quality difference within the scope of full filed is little, therefore can only detect
Image quality under its center field conditions, instead of the testing result of full filed.But for Large Area Telescope, especially
Applied to space measurement field, it is desirable that image quality reaches nearly diffraction limit rank within the scope of full filed, cannot use this
Detection method, because during actual engineering development, under different field conditions, error caused by the factors such as processing, installation
There are bigger difference, the testing result of central vision can only indicate smaller and adjoin the image quality of field range, and be unable to table
Levy the result within the scope of full filed.
For the deficiency in current telescope image quality detection method, the present invention proposes a kind of accurate detection full filed
The method of image quality, and detection can be automatically performed.
Invention content
It is existing approximate with central vision testing result in order to solve in current telescopic optical system image quality detection
The problem of indicating full filed result, the big visual field for having nearly diffraction limit image quality especially for full filed range is looked in the distance
Mirror, the present invention provides a kind of Large Area Telescope optical system imaging quality detection methods.
In order to solve the above-mentioned technical problem, technical scheme of the present invention is specific as follows：
The technical solution adopted by the present invention is：A kind of detection method of Large Area Telescope optical system imaging quality, profit
Detection device includes source of parallel light and its two dimensional motion platform, wave front detector and its sextuple sports platform, computer, is fallen into a trap
Calculation machine, two dimensional motion platform, sextuple sports platform and wave front detector forming control system, computer, wave front detector and sextuple fortune
Dynamic platform composition positioning closed loop configuration, which is characterized in that detection method includes the following steps for this：
The first step：Reference view field is demarcated, and source of parallel light is adjusted to central vision position, is then installed and is adjusted wavefront spy
Device is surveyed to the confocal position of tested Large Area Telescope；
Second step：Measure visual field change, by two dimensional motion platform adjust source of parallel light inclination and pitch attitude, reach by
Survey the incident field angle needed for Large Area Telescope；
Third walks：Wave front detector positions, according to the position of the sextuple sports platform of positioning closed loop configuration adjustment and posture, until
Wave front detector is in confocal position with tested Large Area Telescope；
4th step：Image quality detects, and measurement data of the computer according to wave front detector utilizes relevant wave front restoration
The image quality of tested telescopic optical system is calculated in algorithm；
The the second to four step is repeated, until completing the detection of full filed range image quality.
Further, the source of parallel light, may be used reflective or transmission-type, and effective aperture need to be more than tested hope
The effective aperture of remote mirror.
Further, the measurement visual field needs before testing, according to the field range of tested telescope and detection
It is required that determine, it can be by rectangular or circular distribution formal character.
Further, Hartmann sensor, shearing interferometer or curvature measurement may be used in the wave front detector
Instrument.
Further, the two dimensional motion platform refer to have in source of parallel light optical axial plane two it is orthogonal
The sports platform of rotary freedom.
Further, the sextuple sports platform refers to the sports platform for having space six-freedom degree.
Further, in the System control structures, computer is for calculating, storing wavefront information and visual field letter
Breath, input information include wave front detector measure wavefront information, output information be two dimensional motion platform motion control instruction,
The image quality of Large Area Telescope is tested under the motion control instruction of sextuple sports platform, all field conditions.
Further, the positioning closed loop configuration is made of wave front detector, sextuple sports platform and computer, wavefront
Detector measurement wavefront information, computer disposal wavefront information and sub-aperture hot spot distributed intelligence, and extract inclination, pitching and from
Burnt data adjust sextuple sports platform spatial attitude according to coordinates coupling relationship, until realize the matching lens of wave front detector with
Tested Large Area Telescope is in confocal position.
The present invention has advantageous effect below：
The detection method of the Large Area Telescope optical system imaging quality of the present invention, solves Large Area Telescope and regards entirely
It the problem of field image quality detection, overcomes at present using monoscopic testing result approximate representation whole-view field imaging quality testing
Deficiency improves the accuracy of testing result.For Large Area Telescope optical system imaging quality detection provide one kind can
To use for reference parallel effectively method.
Description of the drawings
Fig. 1 is Large Area Telescope image quality detects schematic diagram.
Fig. 2 is that visual field divides schematic diagram.
Fig. 3 is whole-view field imaging quality inspection process figure.
Fig. 4 is wave front detector positioning flow figure.
Fig. 5 is wave front detector position fixing process sub-aperture hot spot distribution schematic diagram.
Reference numeral meaning is in figure：1 is source of parallel light, and 2 be two dimensional motion platform, and 3 be computer, and 4 be wave front detector,
5 be sextuple sports platform, and 6 be tested Large Area Telescope.
Specific implementation mode
The present invention is described in detail with reference to the accompanying drawings and detailed description.
Detection device of the present invention is shown in Fig. 1, includes mainly source of parallel light 1 and its two dimensional motion platform 2, wave front detector
4 and its sextuple sports platform 5, computer 3 etc., computer 3, two dimensional motion platform 2, sextuple sports platform 5 and the composition control of wave front detector 4
System processed, computer 3, wave front detector 4 and the sextuple composition of sports platform 5 positioning closed loop configuration.
In Fig. 1, source of parallel light 1 uses off-axis reflection source of parallel light, and is fixedly installed in 2 working face of two dimensional motion platform
On, two dimensional motion platform 2 has two orthogonal rotary freedoms, i.e. pitching and inclination is incident tested big for adjusting source of parallel light 1
The field angle of visual field telescope 6.Wave front detector 4 is Hartman wavefront detector, for detecting wavefront information, sextuple sports platform
5 have space six-freedom degree, the spatial position for adjusting wave front detector 4 and posture.Computer 3 mainly has three works
Make, first, calculating, storage field-of-view information, the adjustment of control two dimensional motion platform 2；Second is that the wavefront that processing wave front detector 4 records
Information utilizes inclination, pitching and the defocus item numerical value and sub-aperture hot spot point in wavefront information in positioning closed loop configuration
Cloth information sends corresponding movement instruction by coordinates coupling relationship to sextuple sports platform 5；Third, being calculated according to wavefront information
Image quality.The effect of control system is to meet visual field change within the scope of full filed, the positioning of wave front detector 4 and image quality meter
The accurate progress calculated, the effect for positioning closed loop configuration are ensured in the detection of single visual field, wave front detector 4 can accurately with quilt
It surveys Large Area Telescope 6 and is in confocal position.
Before image quality detection, needs are first determined according to the field range and testing requirements that are tested Large Area Telescope 6
The visual field of detection, can be by rectangular, round equal distribution formal character, as shown in Fig. 2, being made with different visual field image point positions in Fig. 2
For identification, FOV is numbered in each visual fieldi, corresponding source of parallel light field angle is (ui, vi), the coordinate and posture of picture point are
(xi, yi, zi, αi, βi, γi)。
Fig. 3 gives the flow chart of whole-view field imaging quality testing, is broadly divided into four steps, makes being discussed in detail as follows.
The first step, reference view field calibration, generally selects central vision as reference view field, is denoted as FOV0, corresponding parallel
1 field angle of light source is (u0, v0), the coordinate and posture of picture point are (x0, y0, z0, α0, β0, γ0).First by tested Large Area Telescope
6 are mounted on monitor station (not shown), and two dimensional motion platform 2 is recycled to adjust source of parallel light 1 into tested Large Area Telescope 6
Then heart field positions install wave front detector 4 in the image point position of tested Large Area Telescope 6, and utilize sextuple sports platform 5
It adjusts to confocal position, as shown in Figure 1.
Second step measures visual field and changes, the visual field FOV for needing to measure according to selectioniAnd upper measurement visual field FOVi-1,
Make then to tilt and pitch angle θ by the adjustment of two dimensional motion platform 2tukt, θtip, so that source of parallel light 1 is reached tested big visual field and look in the distance
Incident field angle u needed for mirror 6i, vi, structure as shown in Figure 1 can calculate following result.
θtilt=ui-ui-1, θtip=vi-vi-1
Third walks, and wave front detector positioning, the purpose of the step is that wave front detector 4 is accurate from upper visual field image point position
Ground is adjusted to the image point position of tested visual field, it is realized using positioning closed loop configuration, as shown in Figure 1, picture point is from real point to imaginary point
Movement.Fig. 4 gives the flow chart of the positioning of wave front detector 4, first with measurement visual field FOViField angle ui, vi, calculate quilt
Survey the theoretical position (x ' of 6 picture point of Large Area Telescopei, y 'i, z 'i), calculation formula is as follows,
x′i,=f tan (vi)+x0
y′i,=f tan (ui)+y0
z′i=z0
Wherein, f is the focal length of tested Large Area Telescope 6, posture FOV identical as a upper visual fieldi-1, it is (αi-1, βi-1,
γi-1), wave front detector 4 is moved by corresponding theory position by sextuple sports platform 5, incident light, root are found near the picture point
Inclination, pitching and the defocus item data closed loop in wavefront information are detected according to the distribution and wave front detector 4 of sub-aperture hot spot
Position and the posture of wave front detector 4 are adjusted, as shown in figure 5, left figure indicates the sub-aperture hot spot distribution near ideal image point,
Left, top molecule aperture does not have hot spot, while inclination, pitching and defocus item data present in wavefront information are respectively Zntilt,
Zntip, Zndefocus, at this point, computer is according to sub-aperture hot spot distribution form and wavefront information, by coordinates coupling relationship, to
Sextuple sports platform 5 sends instruction, in closed loop procedure, adjusts movement instruction in real time, all sub-apertures is finally made all to there is hot spot,
And it tilts, pitching and defocus item data reach range of allowable error etilt、etip、edefocus, at this point, closed-loop termination, wavefront is visited
It surveys device 4 to adjust to the confocal position of tested Large Area Telescope 6, sub-aperture hot spot is distributed as shown in Fig. 5 right figures, obtained picture point
Position and attitude data are shown below：
(x′i, y 'i, z 'i, αi-1, βi-1, γi-1)→(xi, yi, zi, αi, βi, γi)。
4th step, image quality measure, and according to the wavefront information that wave front detector 4 measures, computer utilizes wave front restoration
Algorithm, such as type method, field method obtain restoring corrugated and the pertinent statistical parameters of its face type, and then are converted into image quality
Evaluation function, such as Si Telieer ratio SR are measured, as following formula indicates：
σ indicates that the RMS value of recovery corrugated face type, λ indicate the wavelength of source of parallel light 1, other evaluation of imaging quality functions can
To be calculated according to related conversion formula.
Control system repeats second step to the 4th step according to visual field sequence is measured, until completing full filed range into image quality
The detection of amount.
Above-described embodiment is merely to clearly illustrate the citing of the present invention, and do not limit the embodiments.Here without
It needs also be exhaustive all embodiments.And obvious changes or variations extended from this are still in this
Among the protection domain of invention.
Claims (7)
1. a kind of detection method of Large Area Telescope optical system imaging quality, the detection device utilized includes source of parallel light
(1) and its two dimensional motion platform (2), wave front detector (4) and its sextuple sports platform (5), computer (3), Computer (3),
Two dimensional motion platform (2), sextuple sports platform (5) and wave front detector (4) forming control system, and computer (3), Wavefront detecting
Device (4) and sextuple sports platform (5) form positioning closed loop configuration, which is characterized in that detection method includes the following steps for this：
The first step：Reference view field is demarcated, and source of parallel light (1) is adjusted to central vision position, is then installed and is adjusted wavefront spy
Device (4) is surveyed to the confocal position of tested Large Area Telescope (6)；
Second step：It measures visual field to change, the inclination and pitch attitude of source of parallel light (1) is adjusted by two dimensional motion platform (2), is reached
Incident field angle needed for tested Large Area Telescope (6)；
Third walks：Wave front detector (4) positions, according to the position of the sextuple sports platform (5) of positioning closed loop configuration adjustment and posture, directly
It is in confocal position to wave front detector (4) and tested Large Area Telescope (6)；
4th step：Image quality detects, measurement data of the computer (3) according to wave front detector (4), multiple using relevant wavefront
The image quality of tested Large Area Telescope (6) optical system is calculated in former algorithm；
Second step is repeated to the 4th step, until completing the detection of full filed range image quality.
2. the detection method of Large Area Telescope optical system imaging quality according to claim 1, it is characterised in that：Institute
The source of parallel light (1) stated, may be used reflective or transmission-type, and effective aperture need to be more than having for tested Large Area Telescope (6)
Imitate bore.
3. the detection method of Large Area Telescope optical system imaging quality according to claim 1, it is characterised in that：Institute
The measurement visual field stated needs before testing, to be determined according to the field range of tested Large Area Telescope (6) and testing requirements, can be with
By rectangular or circular distribution formal character.
4. the detection method of Large Area Telescope optical system imaging quality according to claim 1, it is characterised in that：Institute
Hartmann sensor, shearing interferometer or measuring apparatus of arbitrary shape may be used in the wave front detector (4) stated.
5. the detection method of Large Area Telescope optical system imaging quality according to claim 1, it is characterised in that：Institute
The sextuple sports platform (5) stated refers to the sports platform for having space six-freedom degree.
6. the detection method of Large Area Telescope optical system imaging quality according to claim 1, it is characterised in that：Institute
In the control system stated, computer (3) includes that wavefront is visited for calculating, storing wavefront information and field-of-view information, input information
The wavefront information that device (4) measures is surveyed, output information is the motion control instruction of two dimensional motion platform (2), the fortune of sextuple sports platform (5)
The image quality of Large Area Telescope (6) is tested under dynamic control instruction, all field conditions.
7. the detection method of Large Area Telescope optical system imaging quality according to claim 1, it is characterised in that：Institute
The positioning closed loop configuration stated is made of wave front detector (4), sextuple sports platform (5) with computer (3), and wave front detector (4) is surveyed
Wavefront information is measured, computer (3) handles wavefront information and sub-aperture hot spot distributed intelligence, and extracts inclination, pitching and defocus number
According to, according to coordinates coupling relationship, sextuple sports platform (5) spatial attitude of adjustment, until realizing the matching lens of wave front detector (4)
It is in confocal position with tested Large Area Telescope (6).
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| CN107966279B (en) * | 2017-12-25 | 2024-01-30 | 中国科学院西安光学精密机械研究所 | Multi-view-field wavefront measuring device and method for telescope system |
| CN110361163B (en) * | 2019-06-14 | 2021-06-04 | 中科院南京天文仪器有限公司 | Device and method for detecting large-caliber optical system by parallel light tube suspension scanning |
| CN110889353B (en) * | 2019-11-19 | 2023-04-07 | 中国科学院国家天文台长春人造卫星观测站 | Space target identification method based on primary focus large-visual-field photoelectric telescope |
| CN110907143B (en) * | 2019-12-18 | 2021-05-04 | 中国科学院长春光学精密机械与物理研究所 | Digital camera imaging quality real-time measuring device under temperature field condition |
| CN111665023B (en) * | 2020-06-24 | 2021-10-12 | 中国科学院西安光学精密机械研究所 | Telescope distortion measuring device and method |
| CN112556997B (en) * | 2020-11-30 | 2021-10-08 | 中国科学院长春光学精密机械与物理研究所 | Large-aperture optical system detection method, device, equipment and storage medium |
| CN112525496B (en) * | 2020-12-07 | 2021-11-02 | 中国科学院长春光学精密机械与物理研究所 | Method, device, equipment and medium for sensing wavefront curvature of telescope |
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