CN205192728U - Star sensor optical system multiplying power colour difference test equipment - Google Patents

Abstract

A star sensor optical system multiplying power chromatic aberration test device, the test device includes the target simulation part, the tested optical system installation part, the microscopic collection part and the control and data processing computer; the target simulation component, the tested optical system installation component and the microscopic acquisition component are sequentially arranged on the same light path; the target simulation component comprises a monochromator, a collimator, an optical filter target wheel and a target wheel; the optical filter target wheel and the target wheel are sequentially arranged on an emergent light path of the monochromator; the target surface of the target wheel is superposed with the focal plane of the collimator; the optical system to be measured is arranged on the mounting component of the optical system to be measured; the control and data processing computer is respectively connected with the monochromator, the optical filter target wheel with the optical filters in various spectral ranges required by the test, the target wheel with a plurality of groups of target plates and the installation part of the tested optical system. The utility model has the advantages of efficiency of software testing is high, the testing personnel are few and can enlarge the test range.

Description

Optical system of star sensor ratio chromatism, testing apparatus

Technical field

The utility model belongs to field of optical detection, relates to a kind of optical system of star sensor key parameter automated test device, particularly relates to a kind of testing apparatus of optical system of star sensor ratio chromatism, being carried out to automatically measure.

Background technology

Star sensor take fixed star as reference system, take starry sky as target, with the high-precision spatial attitude measuring that satellite, aerospace craft, aircraft, ships and guided missile etc. are carrier, by the position of different fixed star on detection celestial sphere during work, itself and known star chart are compared, for carrier provides dimensional orientation and benchmark accurately.

Optical system of star sensor is the important component part of star sensor, and its parameter (such as spectral energy concentration degree and ratio chromatism, etc.) directly affects the performance index of the whole system of star sensor.Wherein, spectral energy concentration degree be investigate be distributed in different spectral coverage coloured light in image planes some diffusion circular diameter whether in particular range, differentiate that for making its centroid position can not be treated as noise accurately rejects simultaneously, generally need make a most of concentration of energy of diffusion circle between 1 × 1 to 3 × 3 pixels.In addition, ratio chromatism, is whether within the specific limits the some diffusion circle centroid position investigating same visual field place different spectral coverage coloured light differentiates error, for making its error not affect complete machine attitude measurement, it generally need be made to be not more than 0.3 Pixel size.Above-mentioned two indices embodies in whole system, can ensure that star sensor accurately judges for the position of different spectral coverage fixed star, centroid position accuracy will be caused to differentiate because of spectral coverage difference variant, and then ensure that star sensor provides attitude measurement data accurately for its carrier.As can be seen here, the accurate test of spectral energy concentration degree and ratio chromatism, is for most important star sensor system.

At present, spectral energy concentration degree and ratio chromatism, are the projects spending personnel and time in optical system of star sensor test index most.Due to the impact such as visual field, spectral coverage of test, cause above-mentioned two index test points various, only change test point position and light source spectral coverage by artificial, not only waste time and energy, simultaneously the appearance of also unavoidable various artificial test error.

In addition, because the range of application of star sensor is different, the demand for light source is also different.When testing above-mentioned two indexs, some models need provide the test data under different spectral position monochromatic light, and some models need provide the test data within the scope of a certain spectral coverage, at present, in order to meet measuring technology index, needing often to change light source and adapting to different demands.

The existence of these restrictions, optical system of star sensor test process is made to become the bottleneck of whole development process, hinder the process of star sensor commercialization, be star sensor on the carriers such as satellite, aerospace craft, aircraft, ships and guided missile, carry out widely used one large obstacle.

Therefore, develop a kind of robotization ratio chromatism, testing apparatus for optical system, be very important.

Utility model content

In order to solve the above-mentioned technical matters existed in background technology, the utility model provides that a kind of testing efficiency is high, tester is few and can expand the optical system of star sensor ratio chromatism, testing apparatus of test specification.

Technical solution of the present utility model is: the utility model provides a kind of optical system of star sensor ratio chromatism, testing apparatus, it is characterized in that: described optical system of star sensor ratio chromatism, testing apparatus comprises target simulation parts, tested optical system installing component, micro-acquisition component and control and data handling machine; Described target simulation parts, tested optical system installing component and micro-acquisition component are set in turn in same light path; Described target simulation parts comprise monochromator, parallel light tube, take turns and take turns with the target organizing Target Board more with the optical filter target of the various spectral coverage scope optical filters needed for test; The described optical filter target with the various spectral coverage scope optical filters needed for test is taken turns and is successively set on the emitting light path of monochromator on the target wheel organizing Target Board more; The target surface of the described target wheel with many group Target Boards overlaps with parallel light tube focal plane; Optical system to be measured is arranged on tested optical system installing component; Described control and data handling machine respectively with monochromator, take turns with the optical filter target of the various spectral coverage scope optical filters needed for testing, to take turns with the target organizing Target Board and tested optical system installing component is connected more.

The above-mentioned target wheel with many group Target Boards is fitted with one group of resolution chart, one group of Porro tester and organizes star tester more.

The determination mode of the diameter of the asterism on above-mentioned many group star testers is:

$d>\frac{0.61\mathrm{\λ}F}{D}$

In formula:

D is the diameter of the asterism on star tester, and unit is micron (μm);

λ is the centre wavelength of tested optical system, and unit is micron (μm);

F is the focal length of parallel light tube, and unit is millimeter (mm);

D is the Entry pupil diameters of tested optical system, and unit is millimeter (mm).

Above-mentioned tested optical system installing component comprises pitching and level(l)ing device and mounting flange; Described mounting flange is arranged on pitching and level(l)ing device; Tested optical system is arranged on mounting flange; Described control and data handling machine are connected with pitching and level(l)ing device.

Above-mentioned micro-acquisition component comprises automatically controlled turntable and is arranged on the micro-acquisition system of three-dimensional CCD on automatically controlled turntable; The micro-acquisition system of described three-dimensional CCD comprises D translation platform and is arranged on the CCD microscopic system on D translation platform; Described control and data handling machine are connected with automatically controlled turntable and the micro-acquisition system of three-dimensional CCD respectively.

Above-mentioned D translation platform comprise perpendicular to optical axis direction and the X paralleled with the table top of automatically controlled turntable to electronic control translation stage, perpendicular to optical axis direction and the Y-direction electronic control translation stage perpendicular with the table top of automatically controlled turntable and the Z-direction electronic control translation stage along optical axis direction.

Above-mentioned monochromator comprises spectrometer, described spectrometer outgoing zero degree light or outgoing 300nm ~ 1200nm monochromatic light.

The utility model has the advantages that:

The optical system of star sensor key parameter automated test device that the utility model provides, automatic test can be carried out to ratio chromatism, the index such as focusing, Entry pupil diameters, field angle, back work distance, rear cut-off distance, axial chromatic aberration can test simultaneously, the conventionally test index of optical system of star sensor 80% can be contained.The optical system of star sensor key parameter automated test device that the utility model provides, also can carry out the test of index of correlation to the optical system of other purposes, accommodation is extremely wide; The automatic test of the ratio chromatism, of white light, monochromatic light or certain spectral coverage coloured light test request can be met, without the need to frequently changing light source or changing testing apparatus; Its automatic test disposal system degree of stability is high, and test speed improves 2 times than complete people's Force meansurement, saves manpower and materials, for optical system of star sensor has played great effect by original small serial production commercialization production till now.

Accompanying drawing explanation

Fig. 1 is the structural representation of the testing apparatus that the utility model provides;

Wherein:

1-parallel light tube; 2-target is taken turns; 3-optical filter target is taken turns; 4-monochromator; 5-pitching and level(l)ing device; 6-mounting flange; The automatically controlled turntable of 7-; 8-Y is to electronic control translation stage; 9-Z is to electronic control translation stage; 10-X is to electronic control translation stage; 11-CCD microscopic system; 12-controls and data handling machine.

Embodiment

See Fig. 1, the optical system of star sensor ratio chromatism, testing apparatus that the utility model provides, this equipment comprises: target simulation parts, tested optical system installing component, micro-acquisition component, control and data handling machine 12; Target simulation parts, tested optical system installing component, micro-acquisition component are set in turn on test optical axis; Control and data handling machine are connected with target simulation parts, tested optical system installing component, micro-acquisition component respectively.

Target simulation parts comprise monochromator 4, optical filter target wheel 3, target wheel 2 and parallel light tube 1; Monochromator 4 light-emitting window is towards parallel light tube 1 focal plane; Optical filter target wheel 3 is between monochromator 4 and target wheel 2; Target is taken turns 2 target surfaces and is overlapped with parallel light tube 1 focal plane, specific as follows:

1) monochromator 4 comprises xenon lamp and spectrometer two parts; Spectrometer can meet the demand of outgoing zero degree light (namely not by the xenon lamp primary light of grating in spectrometer) and outgoing 300nm ~ 1200nm monochromatic light (resolution 0.1nm);

2) optical filter target wheel 3 comprises many group optical filter installation sites, can the optical filter of various spectral coverage scopes needed for installation testing;

3) target wheel 2 comprises many group Target Board installation sites, and can install resolution chart, glass sieve plate and star tester, wherein resolution chart is one group, and glass sieve plate is one group, and star tester is many groups;

Tested optical system installing component comprises mounting flange 6, pitching and level(l)ing device 5, and mounting flange 6 is positioned on pitching and level(l)ing device 5;

Micro-acquisition component comprises the micro-acquisition system of three-dimensional CCD and automatically controlled turntable 7; The micro-acquisition system of three-dimensional CCD is positioned on automatically controlled turntable 7; The micro-acquisition system of three-dimensional CCD comprises CCD microscopic system 11 and three translation stages: be respectively perpendicular to X parallel with turntable table top while of optical axis direction to electronic control translation stage 10, perpendicular to the Y-direction electronic control translation stage 8 that optical axis direction is simultaneously vertical with turntable table top, and along the Z-direction electronic control translation stage 9 of optical axis direction;

To control and data handling machine 12 can control above-mentioned all control panels, comprise monochromator 4, optical filter target wheel 3, target wheel 2, pitching and level(l)ing device 5, CCD microscopic system 11, X to electronic control translation stage 10, Y-direction electronic control translation stage, Z-direction electronic control translation stage 9 and automatically controlled turntable 7;

The utility model provide the test mode of optical system of star sensor ratio chromatism, testing apparatus to be:

1) suitable target simulation parts and suitable microcobjective is configured;

2) tested optical system is installed;

3) micro-acquisition component is amplified tested optical system image acquisition that image planes become, and goes to two edges, according to size and the shape fine setting optical system installation unit of become image, makes its optical axis parallel with target simulation parts optical axis;

4) optimum configurations: comprise tested optical system parameter and arrange and method of testing optimum configurations;

5) system is tested automatically: comprise automatically controlled turntable and X and automatically move to electronic control translation stage and adopt a position, target simulation parts change white light, monochromatic light or certain spectral coverage coloured light automatically according to optimum configurations, automatic collection desired data, software backstage calculates final data automatically;

6) output detections report.

The specific implementation of said method is as follows:

1) select suitable microcobjective according to the relative aperture of tested optical system, namely the numerical aperture of microcobjective should be greater than 1/2 of tested optical system relative aperture;

2) according to the Entry pupil diameters of tested optical system, the focal length of parallel light tube 1 and the technical indicator that need test, suitable target simulation parts are configured:

A) configuration purpose target wheel 2:

If measuring optical system ratio chromatism, select asterism diameter d by formula (1),

$d>\frac{0.61\mathrm{\λ}F}{D}$ Formula (1)

In formula:

λ is the centre wavelength of tested optical system, and unit is micron (μm);

F is the focal length of parallel light tube 1, and unit is millimeter (mm);

D is the Entry pupil diameters of tested optical system, and unit is millimeter (mm).

Be configured, as table 1 by selected asterism diameter and at the numbering Input Software of target wheel 2:

Table 1 target wheel 2 numbering and Target Board example

Target location	Target Board
		1#	Resolution chart

2#	0.1mm asterism
		3#	0.2mm asterism
4#	0.005mm asterism

B) optical filter target wheel 3 is configured:

If the index under monochromatic light or white light need be tested, then select the through hole of optical filter target wheel, namely do not tested by any optical filter;

If the index under certain spectral coverage coloured light need be tested, then each spectral coverage optical filter of required test is arranged on optical filter target wheel 3;

Through hole and each spectral coverage optical filter are configured, as table 2 at the numbering Input Software of optical filter target wheel 3:

Table 2 optical filter target wheel 3 numbering and optical filter example

Optical filter position	Centre wavelength	Bandwidth
			1#	Through hole	/
2#	400nm	±100nm
			3#	500nm	±100nm
4#	600nm	±100nm
			5#	700nm	±100nm
6#	400nm	±50nm
			7#	450nm	±50nm
8#	500nm	±50nm
			9#	550nm	±50nm
10#	600nm	±50nm

3) tested optical system being mounted on mounting flange 6, regulating pitching and level(l)ing device 5, until visual all reflective spots on the same line by observing tested optical system each eyeglass reflective spot line;

4) by adjusting CCD microscopic system 11 at Y-direction electronic control translation stage 8, Z-direction electronic control translation stage 9, X to the position on electronic control translation stage 10, it is made to gather tested optical system image planes place image, automatically controlled turntable 7 and X is coordinated to go to optical system two edges to electronic control translation stage 10, according to size and the shape fine setting optical system installation unit of become image, until both sides become the size of image and shape close, namely tested system optical axis is parallel with target simulation parts optical axis;

5) optimum configurations:

A) tested optical system parameter is arranged: comprise the focal distance f of tested optical system, angle of half field-of view ω;

B) method of testing optimum configurations: (according to test index method to set up parameter)

If test index is ratio chromatism, then need to input microcobjective multiple N used, test spectral coverage (if monochromatic light, then inputs optical filter target and takes turns 3 through hole position numberings, input the monochromatic wavelength converted successively needed for monochromator 4 simultaneously; If certain spectral coverage coloured light, then input the required spectral coverage coloured light Position Number that optical filter target wheel 3 configures successively, input monochromator 4 simultaneously and export zero degree light), the Position Number of selected asterism on target wheel 2, test normalization visual field (such as 0.3 visual field, 0.5 visual field etc.), criterion (i.e. ratio chromatism, test result acceptability limit) etc.;

C) other are arranged: the information such as image data storing path, input test personnel, test humiture.

6) automatically test ratio chromatism, concrete method of testing is:

A) automatically controlled turntable 7 rotates counterclockwise the place of maximum field of view that need test, namely-| θ _max|, X is moved to the left edge to electronic control translation stage 10 is corresponding, and amount of movement is:

A=f × tan (| θ _max|) formula (2)

In formula:

A be X to electronic control translation stage amount of movement, unit is millimeter (mm);

F is the focal length of tested optical system, and unit is millimeter (mm);

θ _maxbe the maximum field of view angle that need test, software calculates according to the maximum normalization visual field arranged and angle of half field-of view ω, if maximum normalization visual field is 0.8 visual field, is then θ _max=0.8 × ω, unit is degree (°).

B) at this visual field place, convert test wavelength successively, calculate the row-coordinate x of its barycenter by following formula respectively _{λ i}and row coordinate y _{λ i}, the ratio chromatism, of itself and centre wavelength center-of-mass coordinate value is calculated by the center-of-mass coordinate value of each wavelength, and by the row-coordinate x of each wavelength _{λ i}, row coordinate y _{λ i}and ratio chromatism, is saved to step 5 in order) set by storing path in;

The row-coordinate of barycenter

The row coordinate of barycenter

Note 1: test wavelength replacing options is as follows:

If white light/monochromatic light, optical filter target wheel 3 goes to through hole, the monochromatic light changed white light successively by monochromator or set; If certain spectral coverage coloured light, then monochromator 4 exports zero degree light, is rotated successively according to spectral coverage coloured light Position Number needed for configuring by optical filter target wheel 3.

Consistent with the automatic testing procedure of encircled energy.

Note 2: ratio chromatism, computing method are as follows:

I) identify effective target region, background is gone to effective target region;

Ii) at the row-coordinate x calculating the asterism picture element heart under same visual field place, different wave length by formula (4-1) and formula (4-2) _λand row coordinate y _λ;

Iii) ratio chromatism, is calculated as follows:

${\mathrm{\Δ}}_{\mathrm{\λ}}=\frac{d}{N}\×\sqrt{{(x_{\mathrm{\λ}}-x_{\mathrm{\λ}0})}^2+{\left(y_{\mathrm{\λ}}{-}_{\mathrm{\λ}0}\right)}^2}$

In formula:

Δ _λit is the ratio chromatism, of wavelength X;

D is CCD pixel dimension, and unit is micron (μm);

N is object lens enlargement ratios;

X _λunder wavelength X, the row-coordinate of the asterism picture element heart;

Y _λunder wavelength X, the row coordinate of the asterism picture element heart;

X _{λ 0}under optical system centre wavelength, the row-coordinate of the asterism picture element heart;

Y _{λ 0}under optical system centre wavelength, the row coordinate of the asterism picture element heart;

C), after the ratio chromatism, collection under this visual field place all wavelengths completes, forward next visual field place to and test;

D), after the ratio chromatism, at all preset visual fields place has all been tested, prompting test completes and shows test data;

E) test result can show by reference table 3:

Table 3 ratio chromatism, test result form

7) output detections report, report comprises: test index, test duration, testing apparatus (indicating test object lens multiple, asterism size), tester, test humiture, test data.

Claims (5)

1. an optical system of star sensor ratio chromatism, testing apparatus, is characterized in that: described optical system of star sensor ratio chromatism, testing apparatus comprises target simulation parts, tested optical system installing component, micro-acquisition component and control and data handling machine; Described target simulation parts, tested optical system installing component and micro-acquisition component are set in turn in same light path; Described target simulation parts comprise monochromator, parallel light tube, take turns and take turns with the target organizing Target Board more with the optical filter target of the various spectral coverage scope optical filters needed for test; The described optical filter target with the various spectral coverage scope optical filters needed for test is taken turns and is successively set on the emitting light path of monochromator on the target wheel organizing Target Board more; The target surface of the described target wheel with many group Target Boards overlaps with parallel light tube focal plane; Optical system to be measured is arranged on tested optical system installing component; Described control and data handling machine respectively with monochromator, take turns with the optical filter target of the various spectral coverage scope optical filters needed for testing, to take turns with the target organizing Target Board and tested optical system installing component is connected more;

The described target wheel with many group Target Boards is fitted with one group of resolution chart, one group of Porro tester and organizes star tester more;

The determination mode of the diameter of the asterism on described many group star testers is:

In formula:

D is the diameter of the asterism on star tester, and unit is micron;

λ is the centre wavelength of tested optical system, and unit is micron;

F is the focal length of parallel light tube, and unit is millimeter;

D is the Entry pupil diameters of tested optical system, and unit is millimeter.

2. optical system of star sensor ratio chromatism, testing apparatus according to claim 1, is characterized in that: described tested optical system installing component comprises pitching and level(l)ing device and mounting flange; Described mounting flange is arranged on pitching and level(l)ing device; Tested optical system is arranged on mounting flange; Described control and data handling machine are connected with pitching and level(l)ing device.

3. optical system of star sensor ratio chromatism, testing apparatus according to claim 2, is characterized in that: described micro-acquisition component comprises automatically controlled turntable and is arranged on the micro-acquisition system of three-dimensional CCD on automatically controlled turntable; The micro-acquisition system of described three-dimensional CCD comprises D translation platform and is arranged on the CCD microscopic system on D translation platform; Described control and data handling machine are connected with automatically controlled turntable and the micro-acquisition system of three-dimensional CCD respectively.

4. optical system of star sensor ratio chromatism, testing apparatus according to claim 3, is characterized in that: described D translation platform comprise perpendicular to optical axis direction and the X paralleled with the table top of automatically controlled turntable to electronic control translation stage, perpendicular to optical axis direction and the Y-direction electronic control translation stage perpendicular with the table top of automatically controlled turntable and the Z-direction electronic control translation stage along optical axis direction.

5. optical system of star sensor ratio chromatism, testing apparatus according to claim 4, is characterized in that: described monochromator comprises spectrometer, described spectrometer outgoing zero degree light or outgoing 300nm ~ 1200nm monochromatic light.