CN107727232B - Geometric registration testing device and method - Google Patents
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- CN107727232B CN107727232B CN201711000314.1A CN201711000314A CN107727232B CN 107727232 B CN107727232 B CN 107727232B CN 201711000314 A CN201711000314 A CN 201711000314A CN 107727232 B CN107727232 B CN 107727232B
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- 238000012360 testing method Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000003384 imaging method Methods 0.000 claims abstract description 25
- 244000007853 Sarothamnus scoparius Species 0.000 claims abstract description 8
- 238000012545 processing Methods 0.000 claims abstract description 7
- 238000010998 test method Methods 0.000 claims abstract description 3
- 230000000007 visual effect Effects 0.000 claims description 23
- 238000013519 translation Methods 0.000 claims description 15
- 230000003287 optical effect Effects 0.000 claims description 6
- 238000013461 design Methods 0.000 claims description 4
- 238000001228 spectrum Methods 0.000 description 4
- 230000010354 integration Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/2823—Imaging spectrometer
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/0289—Field-of-view determination; Aiming or pointing of a spectrometer; Adjusting alignment; Encoding angular position; Size of measurement area; Position tracking
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J2003/2866—Markers; Calibrating of scan
Abstract
The invention discloses a geometric registration testing device and a geometric registration testing method, which are particularly suitable for testing a push broom type multi-single machine external stitching imaging spectrometer. The device consists of a collimator, a movable target, a supporting table and a one-dimensional turning component. The test device performs geometric registration test of the push broom type multi-unit external stitching imaging spectrometer by controlling rotation of the one-dimensional turntable and movement of a moving target at the focal plane of the collimator, and obtains the geometric registration relation of the multi-unit after data processing. The invention uses the moving targets at the focal plane of the one-dimensional turntable and the collimator to replace the two-dimensional turntable in the current method, solves the problem of high requirements on the indexes such as precision and bearing of the two-dimensional turntable in the common method, and provides a simple, high-precision and high-efficiency geometric registration test method for the push broom type multi-stand-alone imaging spectrometer. The invention is suitable for geometric registration test of airborne or satellite-borne earth observation multi-single-machine imaging spectrometer and is also suitable for geometric registration test of the multi-single-machine imaging spectrometer.
Description
Technical Field
The invention relates to a test of an imaging spectrometer, in particular to a geometric registration test device and a geometric registration test method of a multi-stand-alone imaging spectrometer.
Background
One of the trends in imaging spectrometers is wide-width, wide-field and wide-spectrum for improving the operating efficiency. Limited by the detector scale, one of the methods to achieve wide-width, wide-field and wide-spectrum performance is multi-stand-alone field stitching, both to improve the optical performance of the system, such as transmittance, image quality, spectral characteristics, etc., and to reduce cost. In order to ensure the registration accuracy of the system in the multi-unit adjustment process as much as possible, a registration device and method is proposed in patent CN104034417 a. The final geometric registration relationship among multiple units also needs accurate test, and test results are provided for data processing personnel for flight data image processing reference.
The main problems existing in the prior art are as follows:
(1) In the multi-unit integrated adjustment process of the system, the geometric registration sub-pixel level or higher precision of the system is ensured, the fine laboratory geometric registration test is not performed any more, and the image registration processing is performed by directly utilizing the outfield flight data through an algorithm.
(2) Geometric registration testing is typically performed using a two-dimensional turret and parallel light pipes, requiring the entire instrument to be placed on the two-dimensional turret. Because the multi-single machine splicing system comprises splicing of a plurality of view fields and even a plurality of spectrum single machines, the integration level of the system is high and complex, and the whole machine after integration has large volume and heavy mass. In addition, the aerial remote sensing instrument generally has a downward light inlet, so that the stress state of the instrument is basically consistent with that of a flying object, the entrance light of the instrument is required to be placed downward during geometric registration test, and the incident light is turned to be horizontal through a turning mirror. Therefore, the turning mirror, the supporting platform and the instrument are integrally arranged on the two-dimensional turntable, so that the requirement on the turntable is high, and the turntable is required to have large bearing capacity, large bearing surface and high precision.
Disclosure of Invention
The invention aims to make up the defects of the prior art and provides a high-precision and high-efficiency geometric registration testing device and method.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
fig. 1 is a geometric registration test device of the present invention, which is composed of a collimator 1, a moving target 2, a support table 3 and a one-dimensional turning component 4.
The movable target 2 consists of a target hole 2.1 and a translation table 2.2, wherein the target hole 2.1 is positioned on the focus of the collimator 1, the aperture of the target hole 2.1 corresponds to the instantaneous resolution of the instrument to be measured, and the translation table 2.2 is driven to realize left and right translation of the target hole 2.1. The one-dimensional turning component 4 consists of a plane mirror 4.1 and a one-dimensional rotary table 4.2, wherein the aperture of the plane mirror 4.1 can cover the light passing requirements of all visual fields of all single machines, the rotary shaft of the one-dimensional rotary table 4.2 is perpendicular to the optical axis of the collimator 1, and the one-dimensional rotary table 4.2 is driven to enable instantaneous visual field light rays from the target hole 2.1 to be incident into an instrument to be measured at different angles.
The instrument to be measured is a push broom type imaging spectrometer, a large view field is realized by externally splicing a plurality of single machines with the same design parameters, and the number of the single machines is n. The instrument to be measured is placed on the supporting table 3, and the space dimension of the instrument to be measured is perpendicular to the rotating shaft of the one-dimensional rotating table 4.2 and the optical axis of the light beam from the collimator 1.
During geometric registration test, the one-dimensional turning component 4 is driven to a certain view field, the moving target 2 is driven to find out that the response on the detector is extremely large, and data (N ij ,θ ij ,X ij ) Subscript i denotes a single machine number, i=1, 2..n, subscript j denotes a field number, j=1, 2.. 5,N ij 、θ ij And X ij The corresponding number of spatial dimensions of the jth field of view of the ith machine, the value of the one-dimensional turret 4.2 and the value of the translation stage 2.2 are shown, respectively.
And processing the data to obtain the geometric registration relation of the multi-single-machine imaging spectrometer. Each single machine selects 5 visual fields in space dimension, and the visual field sequence numbers j are 1,2, 3, 4 and 5, namely an edge-1 visual field, a visual field which is overlapped with the adjacent single machine on the left, a central 0 visual field, a visual field which is overlapped with the adjacent single machine on the right, and an edge +1 visual field. For unit 1, there is no adjacent unit to the left, then the field of view may not be measured; for a single machine n, there is no adjacent single machine to the right, then the field of view may not be measured.
The total field of view of the measured multi-unit imaging spectrometer is 2|theta 11 -θ n5 I (I); focal length f of stand-alone i i Is 0.5|N i5 -N i1 |·p i /tan|θ i5 -θ i1 I, wherein p i The size of the detector pixel corresponding to 1 instantaneous field of view of the ith stand-alone; instantaneous field of view IFOV for single machine i i Is p i /f i The method comprises the steps of carrying out a first treatment on the surface of the The geometric registration relation of the rail passing, namely the overlapping view field is |N i4 -N i5 I, also expressed as |n i+1,1 -N i+1,2 I (I); the geometric registration relation along the rail, namely the parallelism of equivalent slits among single units of the push broom type imaging spectrometer, can lead the value X of the translation stage 2.2 corresponding to the marginal view field of the single unit 1 11 Assuming that the focal length of the collimator 1 is f as a reference, the equivalent slit inclination of the single unit i is represented as |x by the number of pixels i5 -X i1 |/(f·IFOV i ) And, relative to the single machine 1, at the edge field of view N i5 I.e. N i+1,2 Equivalent slit and reference field of view X 11 The deviation of (2) can be expressed approximately as |X 11 -X i5 |/(f·IFOV i ) Can also be expressed approximately as |X 11 -X i+1，2 |/(f·IFOV i+1 )。
Due to the use of the technical scheme, the geometric registration testing device and the geometric registration testing method have the advantages that: for a complex multi-stand system with high integration level, a two-dimensional rotating platform which usually carries an instrument to be tested is replaced by a turning mirror assembly 3 and a moving target 2 placed at the focal plane of the collimator 1, the two-dimensional rotating platform is not used any more, and the device is easy to realize and control; the single machine number and the spectrum number of the outer splice can be expanded, the single machine outer splice with different design parameters can be applied, and the single machine outer splice can also be applied to a detector inner splice system; the method can be used for measuring the geometric registration of the multi-stand-alone imaging spectrometer and can also be applied to the geometric registration test of other imaging instruments; the number of fields of view can be expanded, and distortion test is performed.
Drawings
Fig. 1 is a schematic diagram of a geometric registration test apparatus of the present invention.
In the figure: 1 is a collimator;
2 is a moving target;
2.1 is a target hole;
2.2 is a translation stage;
3 is a supporting table;
4 is a one-dimensional turning component;
4.1 is a plane mirror;
4.2 is a one-dimensional turntable.
Fig. 2 is a graph of geometric registration test results for a multi-stand-alone imaging spectrometer.
Detailed Description
A preferred embodiment of the present invention is described in detail below with reference to fig. 1:
the imaging spectrometer to be detected is formed by splicing two single machines, the design parameters of the two single machines are consistent, each single machine is provided with a 14.58-degree designed view field, the designed value of the intersection angle of the adjacent single machines is about 1.78 degrees, the designed value of the instantaneous view field is 0.125mrad, the corresponding detector pixel is 16 mu m, and the number of single machine detection elements is 2048 yuan. And testing the geometric registration relation of the two single machines.
Fig. 1 is a geometric registration test device of the present invention, which is composed of a collimator 1, a moving target 2, a support table 3 and a one-dimensional turning component 4. The aperture of the target hole 2.1 is 0.25mm, the translation stroke of the translation table 2.2 is driven to be plus or minus 5mm, and the translation precision is 1 mu m. The caliber of the plane mirror 4.1 is 420mm multiplied by 200mm, the one-dimensional turntable 4.2 can be driven to rotate at 360 degrees, and the angle precision is 0.5'.
The light path construction and the instrument to be measured installation are carried out according to fig. 1. When the translation stage 2.2 is in a zero position, the target hole 2.1 is arranged on the focus of the collimator tube 1, and when the folded light beam is vertically upwards, the one-dimensional turntable 4.2 is set as a reference zero point. The imaging spectrometer to be measured is placed on the supporting table 3, and the space dimension of the imaging spectrometer to be measured is perpendicular to the rotating shaft of the rotating table 4.2 and the optical axis of the light beam.
Since the number of the single machines is 2, the left side of the single machine 1 is not provided with an adjacent single machine, the right side of the single machine 2 is not provided with an adjacent single machine, so that 5 fields of view are selected, but the 2 nd field of view of the single machine 1 and the 4 th field of view of the single machine 2 are not detected. The 5 visual fields in the space dimension are respectively provided with the sequence numbers of 1,2, 3, 4 and 5, namely an edge-1 visual field, a visual field which is overlapped with the end of an adjacent single machine, a central 0 visual field, a visual field which is overlapped with the start of the adjacent single machine and an edge +1 visual field. The one-dimensional turning component 4 is driven to each view field, the moving target 2 is driven to find the response on the detector to be extremely large, and recorded data are listed in table 1.
Table 1 test data record table
| Sequence number of field of view | |
Sequence number of field of view | |
| 1 | (1,-7°6′50″,0) | ||
| 2 | -- | ||
| 3 | (1024,-3°26′49″,0) | ||
| 4 | (1923.7,-13′22″,0) | 1 | (1,-13′22″,-0.040) |
| 5 | (2048,13′20″,0) | 2 | (125.3,13′20″,-0.032) |
| 3 | (1024,3°26′47″,0.041) | ||
| 4 | -- | ||
| 5 | (2048,7°6′48″,0.119) |
The total field of view of the imaging spectrometer is 28 deg. 27'16 ", i.e. 28.45 deg. as seen by the data processing. The rail passing overlapping view fields of two single units of the imaging spectrometer are 1923.7 to 2048 columns of space dimension of single unit 1, and 1 to 125.3 columns of space dimension of single unit 2; along-track registration relationship: the single 1 slit overlaps the scan field of view, and the single 2 slit has a tilt of 0.64 pel relative to the single 1 slit. The results are shown in FIG. 2.
Claims (2)
1. The utility model provides a geometric registration testing arrangement, comprises collimator (1), removal target (2), brace table (3) and one-dimensional turning subassembly (4), its characterized in that:
the mobile target (2) consists of a target hole (2.1) and a translation table (2.2), wherein the target hole (2.1) is arranged on the focus of the collimator (1), the aperture of the target hole (2.1) corresponds to the instantaneous resolution of an instrument to be tested, and the translation table (2.2) is driven to realize left and right translation of the target hole (2.1); the one-dimensional turning component (4) consists of a plane mirror (4.1) and a one-dimensional rotary table (4.2), the aperture of the plane mirror (4.1) can cover the light passing requirements of all single machine fields of all single machine of the push broom type multi-single machine external spliced imaging spectrometer, the rotary shaft of the one-dimensional rotary table (4.2) is perpendicular to the optical axis of the collimator (1), and the one-dimensional rotary table (4.2) is driven to enable instantaneous field light rays from the target hole (2.1) to be incident into the instrument to be measured at different angles;
the instrument to be tested is a push broom type imaging spectrometer, a large view field is realized by externally splicing a plurality of single machines with the same design parameters, the number of the single machines is n, the instrument to be tested is placed on a supporting table (3), and the space dimension of the instrument to be tested is perpendicular to the rotating shaft of a one-dimensional rotating table (4.2) and the optical axis of a light beam from a collimator (1).
2. A geometric registration test method based on the geometric registration test device as claimed in claim 1, characterized in that the method comprises the following steps:
during geometric registration test, the one-dimensional turning component (4) is driven to a certain view field, the moving target (2) is driven to find out that the response on the detector of the instrument to be tested is extremely large, and data (N ij ,θ ij ,X ij ) Subscript i denotes a single machine number, i=1, 2..n, subscript j denotes a field number, j=1, 2.. 5,N ij 、θ ij And X ij The corresponding space dimension number of the j-th view field of the i-th stand-alone, the numerical value of the one-dimensional turntable (4.2) and the numerical value of the translation table (2.2) are respectively represented;
processing the data to obtain the geometric registration relation of the multi-single-machine imaging spectrometer; each single machine selects 5 visual fields in space dimension, the visual field sequence numbers j are 1,2, 3, 4 and 5, and are respectively an edge-1 visual field, a visual field which is overlapped with the adjacent single machine on the left, a central 0 visual field, a visual field which is overlapped with the adjacent single machine on the right, and an edge +1 visual field, and for the single machine 1, if the adjacent single machine on the left is not detected, the visual fields are not detected; for single machine n, if there is no adjacent single machine on the right, the field of view is not measured;
the total field of view of the measured multi-unit imaging spectrometer is 2|theta 11 -θ n5 I (I); focal length f of stand-alone i i Is 0.5|N i5 -N i1 |·p i /tan|θ i5 -θ i1 I, wherein p i The size of the detector pixel corresponding to 1 instantaneous field of view of the ith stand-alone; instantaneous field of view IFOV for single machine i i Is p i /f i The method comprises the steps of carrying out a first treatment on the surface of the The geometric registration relation of the rail passing, namely the overlapping view field is |N i4 -N i5 I, or expressed as |n i+1,1 -N i+1,2 I (I); the geometric registration relation along the rail, namely the parallelism of equivalent slits among single units of the push broom type imaging spectrometer, the numerical value X of a translation stage (2.2) corresponding to the marginal field of view of the single unit 1 11 Assuming that the focal length of the collimator (1) is f as a reference, the equivalent slit inclination of the single unit i is represented as |X in terms of the number of pixels i5 -X i1 |/(f·IFOV i ) And, with respect to the stand-alone 1,at the edge field of view N i5 I.e. N i+1,2 Equivalent slit and reference field of view X 11 The deviation of (2) can be expressed as |X 11 -X i5 |/(f·IFOV i ) Or expressed as |X 11 -X i+1，2 |/(f·IFOV i+1 )。
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| JP2008139062A (en) * | 2006-11-30 | 2008-06-19 | Toray Ind Inc | Spectrum measuring apparatus, and spectrometry |
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| US7455407B2 (en) * | 2000-02-11 | 2008-11-25 | Amo Wavefront Sciences, Llc | System and method of measuring and mapping three dimensional structures |
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| US5777736A (en) * | 1996-07-19 | 1998-07-07 | Science Applications International Corporation | High etendue imaging fourier transform spectrometer |
| US6061086A (en) * | 1997-09-11 | 2000-05-09 | Canopular East Inc. | Apparatus and method for automated visual inspection of objects |
| JP2008139062A (en) * | 2006-11-30 | 2008-06-19 | Toray Ind Inc | Spectrum measuring apparatus, and spectrometry |
| JP2015055480A (en) * | 2013-09-10 | 2015-03-23 | 株式会社島津製作所 | Spectroscopy measurement device |
| CN106767907A (en) * | 2016-11-29 | 2017-05-31 | 上海卫星工程研究所 | Optical camera geometry imaging model high-precision calibrating and apparatus for evaluating and method |
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