CN105806593B - A kind of focal-length measurement method based on fixed star conventional surface observational system - Google Patents
A kind of focal-length measurement method based on fixed star conventional surface observational system Download PDFInfo
- Publication number
- CN105806593B CN105806593B CN201610142801.0A CN201610142801A CN105806593B CN 105806593 B CN105806593 B CN 105806593B CN 201610142801 A CN201610142801 A CN 201610142801A CN 105806593 B CN105806593 B CN 105806593B
- Authority
- CN
- China
- Prior art keywords
- mrow
- imaging spectrometer
- msub
- telescope
- equatorial
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000000691 measurement method Methods 0.000 title claims abstract description 11
- 238000003384 imaging method Methods 0.000 claims abstract description 54
- 238000000034 method Methods 0.000 claims abstract description 12
- 230000003287 optical effect Effects 0.000 claims abstract description 12
- 230000003595 spectral effect Effects 0.000 claims description 13
- 230000000007 visual effect Effects 0.000 claims description 6
- 238000001228 spectrum Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 abstract description 10
- 235000019892 Stellar Nutrition 0.000 abstract description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011549 displacement method Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Classifications
-
- 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
Abstract
A kind of focal-length measurement method based on fixed star conventional surface observational system, it is related to imager focometry technical field, solves the problems, such as that the slit-type imaging spectrometer of one-dimensional spatial information is not easy to carry out field focometry.This method is：Calibrate equatorial telescope pole axis, start stellar tracking system, the relation changed using the equatorial coordinates system and fixed star signal of equatorial telescope with the field positions in instrument, the slit height direction for finely tuning imaging spectrometer is vertical with the declination axis of equatorial telescope, utilize the high-precision equatorial coordinates control system of equatorial telescope, using the fixed star in universe as spot light, carry out the focal length of calculating optical system in the fixed angular distance of imaging spectrometer space dimension rotation.Ground star observation system is mainly by equatorial telescope, astronomical telescope and imaging spectrometer composition, and measurement structure is simple, and the use of equatorial telescope effectively increases the precision and efficiency of focometry.
Description
Technical field
The present invention relates to imager focometry technical field, more particularly to a kind of based on fixed star conventional surface observational system
Focal-length measurement method.
Background technology
Focal length is one of optical element and the most important optical property parameter of optical system, the direct shadow of accurate measurement of focal length
Optical instrument technical performance in actual application has been rung to give full play to.The method of focal length measurement has a lot, such as displacement
Method, magnifying power method, precision angle method, raster method, Abbe method etc., but these traditional focal-length measurement methods are difficult to meet that field is answered
Miscellaneous environmental condition, and for the focometry of ground astronomical observation system, often using Double Star System in universe or
The diameter of celestial body carrys out focal length measurement, for example, a kind of optical system focal length accurate measurement method (patent based on moon imaging
CN103792069A) it is focal length that telescopic system is calculated by the diameter of the moon, but this kind of measuring method is not suitable for only one
The imaging spectral instrument system of dimension space information, it is therefore desirable to the method for studying new field measurement focal length, make it have applicability
By force, it is simple to operate, there is provided the features such as high-acruracy survey.
The content of the invention
In order to solve problems of the prior art, the invention provides a kind of Jiao based on fixed star conventional surface observational system
Distance measurement method, this method overcome the shortcomings of prior art to this quasi-instrument focometry of imaging spectrometer.
The technical proposal for solving the technical problem of the invention is as follows：
A kind of focal-length measurement method based on fixed star conventional surface observational system, this method comprise the following steps：
Step 1：The pole of equatorial telescope is calibrated by more than 300 fixed stars using the astronomical telescope on equatorial telescope
Axle, make the optical axis of astronomical telescope and right ascension axle of the optical axis respectively with equatorial telescope of imaging spectrometer is put down on equatorial telescope
OK；The fixed star of no bright star is placed in astronomical telescope detector field of view center around selection one, starts equatorial telescope star tracking
Pattern, rotate the right ascension axle or declination axis of equatorial telescope；When imaging spectrometer produce spectral signal when, i.e., target fixed star regulation arrive into
As spectrometer field range in；
Step 2：It is vertical with the declination axis of equatorial telescope to adjust the slit height of imaging spectrometer, rotation declination axis makes target
Fixed star moves in imaging spectrometer space dimension all the time, when entering the change of the signal in imaging spectrometer visual field, adjusts imaging
The angle of pitch of spectrometer makes signal magnitude keep constant；
Step 3：Equatorial telescope is set to rotate up fixed angular distance Δ φ in declination sidej, collection target fixed star is in imaging
The starting of spectrometer space dimension and the data of final position, seek the center y of two positions respectively using Gauss curve fitting1(λi) and
y2(λi), the focal length using below equation by the geometric relative position iterative calculation conventional surface observational system between two centers
fi,j,
Wherein d is imaging spectrometer detector Pixel size, λiIt is the wavelength value of imaging spectrometer；When the equatorial telescope anglec of rotation
Away from for Δ φjWhen, imaging spectrometer spectrum is tieed up into each spectral coverage λiThe focal length f that place obtainsi,jAsk it average
Control equatorial telescope to rotate different angular distances, calculate the focal length f under different angular distances respectivelyj, and ask it average, that is, obtain ground observation
The focal length of systemWherein i, j, m and n are all positive integer.
The beneficial effects of the invention are as follows：The present invention can be used for the measurement in conventional surface observational system focal length, take full advantage of red
Road instrument stellar tracking system, the simple in measurement system structure, it is not necessary to special focometry target, while the equatorial system of coordinates
Using and declination direction measurement efficiently avoid the focusing of equatorial telescope tracking accuracy measure influence, improve imaging spectral
The precision and efficiency of instrument field focometry.Based on the imaging characteristicses that imaging spectral instrument system is only one-dimensional, double star in universe or
Three star systems have its directionality, are difficult to enter slit-type imaging spectrometer visual field simultaneously in field measurement, while imaging spectral
Instrument and the diameter and edge of celestial body not easy to identify, so the present invention utilizes the high accuracy of equatorial telescope using fixed star as its spot light
Control system, solves the problems, such as the measurement of imaging spectrometer system focal length.
Brief description of the drawings
A kind of focal-length measurement method structure drawing of device based on fixed star conventional surface observational system of Fig. 1 present invention.
Fig. 2 present invention is using fixed star to imaging spectrometer focometry schematic diagram.
In figure：1st, equatorial telescope, 2, imaging spectrometer, 3, astronomical telescope, 4, target fixed star, 5, right ascension axle, 6, declination axis,
7th, slit direction, 8, micro-adjusting mechanism, 9, bottom plate, 10, space dimension and 11, spectrum dimension.
Embodiment
The present invention is described in further details with reference to the accompanying drawings and examples.
A kind of focal-length measurement method based on fixed star conventional surface observational system of the present invention.Ground star observation system mainly by
Equatorial telescope 1, astronomical telescope 3 and imaging spectrometer 2 form, and astronomical telescope 3 and imaging spectrometer 2 are separately mounted to equatorial telescope
On 1.Equatorial telescope 1 is mainly made up of right ascension axle 5 and declination axis 6, and declination axis 6 and right ascension axle 5 are orthogonal, and astronomical telescope 3 is used
In the pole axis (right ascension axle 5) of calibration equatorial telescope 1, and the optical axis of astronomical telescope 3 and the optical axis of imaging spectrometer 2 are respectively parallel to
Right ascension axle 5, while the slit direction 7 of imaging spectrometer 2, perpendicular to the declination axis 6 of equatorial telescope 1, this example is used for solving imaging
The focometry of spectrometer 2.
Step 1：Using the astronomical telescope 3 on equatorial telescope 1 equatorial telescope 1 is calibrated by more than 300 fixed stars
Pole axis, select the target fixed star 4 for not having bright star around one, be placed on the detector center of astronomical telescope 3, startup fixed star with
Track pattern, now only right ascension axle 5 rotates, the equatorial coordinates system based on equatorial telescope 1, rotates the right ascension axle 5 of equatorial telescope 1, treats as
When producing spectral signal as spectrometer 2, illustrate that the regulation of target fixed star 4 is arrived in the field range of imaging spectrometer 2.
Step 2：Slit height is finely tuned using the micro-adjusting mechanism 8 of the software control system of equatorial telescope 1 and imaging spectrometer 2, is led to
Rotation declination axis 6 is crossed to ensure that target fixed star 4 is moved in the space dimension 10 of imaging spectrometer 2, when target fixed star 4 enters imaging spectral
The energy of the visual field of instrument 2 becomes hour, i.e., when target fixed star 4 gradually goes out 2 visual field of imaging spectrometer, adjusts the bottom of imaging spectrometer 2
Angle of pitch micro-adjusting mechanism 8 makes target fixed star 4 be located in the visual field of imaging spectrometer 2, and its signal magnitude is held essentially constant, so logical
Operated more than crossing, make the slit direction 7 of imaging spectrometer 2 parallel to the bottom plate 9 of equatorial telescope 1, and it is vertical with declination axis 6.
Step 3：Using the software control system of equatorial telescope 1, fixed angular distance is rotated up in declination side, equatorial telescope 1 can
The angular distance of selection has 5,10,15,30 jiaos points/rad etc..The rising in the space dimension 10 of imaging spectrometer 2 of target fixed star 4 is gathered respectively
The data to begin with final position, starting and the center terminated are asked using Gauss curve fitting method, passes through two using below equation
The focal length f of geometric relative position iterative calculation conventional surface observational system between individual centeri,j,
Wherein d is the detector Pixel size of imaging spectrometer 2, λiIt is the wavelength value of imaging spectrometer 2, Δ φjIt is equatorial telescope
The angular distance of 1 rotation, y1(λi) and y2(λi) it is target fixed star 4 respectively in the λ of 2 space dimension of imaging spectrometer 10iThe starting and termination at place
Center；The spectral region of imaging spectrometer 2 is 400nm to 1000nm, when the anglec of rotation of equatorial telescope 1 is away from for Δ φjWhen, will be into
As the spectrum of spectrometer 2 ties up 11 each spectral coverage λiThe focal length f that place obtainsi,jAsk it averageControl equatorial telescope 1 revolves
Turn different angular distances, wherein angular distance scope is spent from 0.01 to 0.7, calculates the focal length f under different angular distances respectivelyj, and ask it average
Obtain the focal length of conventional surface observational systemWherein i, j, m and n are all positive integer.
Claims (1)
1. a kind of focal-length measurement method based on fixed star conventional surface observational system, it is characterised in that this method comprises the following steps：
Step 1：The pole axis of equatorial telescope is calibrated by more than 300 fixed stars using the astronomical telescope on equatorial telescope, is made
The optical axis of the astronomical telescope and optical axis of imaging spectrometer is parallel with the right ascension axle of equatorial telescope respectively on equatorial telescope；Selection
The fixed star of no bright star is placed in astronomical telescope detector field of view center around one, starts equatorial telescope star tracking pattern, rotation
Turn the right ascension axle or declination axis of equatorial telescope；When imaging spectrometer produces spectral signal, i.e. imaging spectral is arrived in target fixed star regulation
In the field range of instrument；
Step 2：Imaging spectrometer is adjusted, makes slit direction vertical with the declination axis of equatorial telescope, rotation declination axis makes target fixed star
All the time moved in imaging spectrometer space dimension, when entering the change of the signal in imaging spectrometer visual field, adjust imaging spectrometer
The angle of pitch make signal magnitude keep it is constant；
Step 3：Equatorial telescope is set to rotate up fixed angular distance Δ φ in declination sidej, collection target fixed star is in imaging spectrometer
The starting of space dimension and the data of final position, seek the center y of two positions respectively using Gauss curve fitting1(λi) and y2
(λi), the focal length using below equation by the geometric relative position iterative calculation conventional surface observational system between two centers
fi,j,
<mrow>
<msub>
<mi>&Delta;&phi;</mi>
<mi>j</mi>
</msub>
<mo>=</mo>
<msup>
<mi>tan</mi>
<mrow>
<mo>-</mo>
<mn>1</mn>
</mrow>
</msup>
<mrow>
<mo>(</mo>
<mfrac>
<mrow>
<mi>d</mi>
<mo>&times;</mo>
<msub>
<mi>y</mi>
<mn>1</mn>
</msub>
<mrow>
<mo>(</mo>
<msub>
<mi>&lambda;</mi>
<mi>i</mi>
</msub>
<mo>)</mo>
</mrow>
</mrow>
<msub>
<mi>f</mi>
<mrow>
<mi>i</mi>
<mo>,</mo>
<mi>j</mi>
</mrow>
</msub>
</mfrac>
<mo>)</mo>
</mrow>
<mo>-</mo>
<msup>
<mi>tan</mi>
<mrow>
<mo>-</mo>
<mn>1</mn>
</mrow>
</msup>
<mrow>
<mo>(</mo>
<mfrac>
<mrow>
<mi>d</mi>
<mo>&times;</mo>
<msub>
<mi>y</mi>
<mn>2</mn>
</msub>
<mrow>
<mo>(</mo>
<msub>
<mi>&lambda;</mi>
<mi>i</mi>
</msub>
<mo>)</mo>
</mrow>
</mrow>
<msub>
<mi>f</mi>
<mrow>
<mi>i</mi>
<mo>,</mo>
<mi>j</mi>
</mrow>
</msub>
</mfrac>
<mo>)</mo>
</mrow>
</mrow>
Wherein d is imaging spectrometer detector Pixel size, λiIt is the wavelength value of imaging spectrometer；When the equatorial telescope anglec of rotation away from for
ΔφjWhen, imaging spectrometer spectrum is tieed up into each spectral coverage λiThe focal length f that place obtainsi,jAsk it averageControl
Equatorial telescope rotates different angular distances, calculates the focal length f under different angular distances respectivelyj, and ask it average, that is, obtain conventional surface observational system
Focal lengthWherein i, j, m and n are all positive integer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610142801.0A CN105806593B (en) | 2016-03-14 | 2016-03-14 | A kind of focal-length measurement method based on fixed star conventional surface observational system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610142801.0A CN105806593B (en) | 2016-03-14 | 2016-03-14 | A kind of focal-length measurement method based on fixed star conventional surface observational system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105806593A CN105806593A (en) | 2016-07-27 |
| CN105806593B true CN105806593B (en) | 2018-01-05 |
Family
ID=56468276
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610142801.0A Expired - Fee Related CN105806593B (en) | 2016-03-14 | 2016-03-14 | A kind of focal-length measurement method based on fixed star conventional surface observational system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105806593B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112070822B (en) * | 2020-08-27 | 2023-02-10 | 中国科学院西安光学精密机械研究所 | Synchronization method for equatorial telescope for lunar observation of foundation |
| CN112019745B (en) * | 2020-08-31 | 2021-08-24 | 苏州振旺光电有限公司 | Method for acquiring target image of sky area and astronomical photographing equipment |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008026048A (en) * | 2006-07-19 | 2008-02-07 | Nikon Corp | Flange focal distance measuring instrument |
| JP2008268054A (en) * | 2007-04-23 | 2008-11-06 | Olympus Corp | Device for measuring focal position |
| CN104165758B (en) * | 2014-08-29 | 2017-01-18 | 南京理工大学 | Lens focal length measuring device and method based on Fizeau interferomenter |
| CN204479272U (en) * | 2015-03-04 | 2015-07-15 | 陶沙 | A kind of focimeter |
| CN104833486B (en) * | 2015-05-13 | 2018-01-19 | 北京理工大学 | Multiple reflections formula laser differential confocal Long focal length measurement method and apparatus |
-
2016
- 2016-03-14 CN CN201610142801.0A patent/CN105806593B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN105806593A (en) | 2016-07-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Cui et al. | The large sky area multi-object fiber spectroscopic telescope (LAMOST) | |
| Reid et al. | The trigonometric parallax of Cygnus X-1 | |
| CN102135435B (en) | Error correction method and device for digital sun sensor | |
| CN106371102B (en) | Inverse Synthetic Aperture Laser Radar receiving system based on adaptive optics | |
| CN102927982B (en) | Double-spectrum autonomous navigation sensor and design method of double-spectrum autonomous navigation sensor | |
| CN102967380B (en) | Hartmann wavefront sensor based on unit photo-sensitive detector array | |
| CN111707451B (en) | Method for calibrating internal orientation element and distortion of interference type imaging spectrometer | |
| CN103926548B (en) | A kind of method of quick measurement radio telescope reflector precision | |
| CN102288201B (en) | Precision measurement method for star sensor | |
| CN104462776A (en) | Method for absolutely radiometric calibration of low orbit earth observation satellite with moon as reference | |
| CN104101297B (en) | Space object dimension acquisition method based on photoelectric observation | |
| CN103389037B (en) | A kind of illumination diffraction optical element geometric techniques parameter detection device and method | |
| CN105444778B (en) | A kind of star sensor based on imaging geometry inverting is in-orbit to determine appearance error acquisition methods | |
| CN105806593B (en) | A kind of focal-length measurement method based on fixed star conventional surface observational system | |
| CN108955883A (en) | Remote sensor Calibration Method and scaling system based on high-spectral data | |
| CN102607820A (en) | Focal length measurement method for micro-lens array | |
| CN105387996B (en) | More optical axis ground star observation systematic optical axis uniformity calibration methods | |
| CN106644105B (en) | Wavefront sensor, detection method and system based on double helix point spread function | |
| CN103591966A (en) | Star simulator test platform and test calibration method | |
| CN202885806U (en) | Multifunctional astronomical theodolite | |
| CN106092515B (en) | A method of with Fabry-Perot etalon focal length measurement and corner | |
| CN204479186U (en) | Wide spectrum Shack-Hartmann wavefront sensor absolute calibration device | |
| CN105023281A (en) | Method for computing center of mass of star map based on point spread function wave front correction | |
| CN106371149A (en) | Extrasolar terrestrial planet space-based high-precision detection method | |
| RU2507495C1 (en) | Method to monitor parameters of optic-electronic systems in working range of temperatures |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180105 |