CN108458856A - The detection device and its method of segmentation detection dome seeing based on laser light source - Google Patents
The detection device and its method of segmentation detection dome seeing based on laser light source Download PDFInfo
- Publication number
- CN108458856A CN108458856A CN201810007512.9A CN201810007512A CN108458856A CN 108458856 A CN108458856 A CN 108458856A CN 201810007512 A CN201810007512 A CN 201810007512A CN 108458856 A CN108458856 A CN 108458856A
- Authority
- CN
- China
- Prior art keywords
- laser
- dome
- seeing
- laser light
- light source
- 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.)
- Pending
Links
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
Landscapes
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Telescopes (AREA)
Abstract
The detection device and its method of segmentation detection dome seeing based on laser light source, the present apparatus is positioned in telescope dome, be characterized in the present apparatus by two laser light sources by the parallel Laser emission of two beams to CCD camera, the output of the CCD camera connects image procossing computer, forms detector." two laser light sources " is two lasers for generating parallel laser or " two laser light sources " is a half-reflecting half mirror and a laser.The present invention can be measured when realizing the high-precision real of dome seeing in any one section of light path, and the parallel dome seeing of serial and multistage in multistage light path can be further realized and finely measured, the evaluation analysis of the optical property of evaluation and dome inner optical system for dome seeing is extremely important.
Description
Technical field
The present invention relates to a kind of dome seeing detecting instrument based on laser light source and image processing techniques is applicable in very much
In the dome seeing detection on various large aperture telescopes and various light paths, and the device of the invention can be convenient, flexible
Segmentation detection is carried out to complicated optical system light path.The invention further relates to the working methods of this detection device.
Background technology
Seeing refers to influence of the earth atmosphere to optical imagery, and Producing reason is exactly that temperature distribution is non-uniform in light path
Caused, a large amount of changes in temperature air mass can be had by also just saying in light path, have small temperature difference, cold air mass with the air of surrounding
There is higher density and refractive index compared with warm air mass so that because of refractive index constant when light passes through air mass boundary
Localized variation and deviation occurs, so as to cause the disturbance of image patch, imaging is more clear, and seeing is better.
Seeing is generally divided into platform location atmospheric seeing, dome seeing and minute surface seeing.
Wherein atmospheric seeing refers to dispersion, distortion, absorption, the red shift of light caused by the disturbance of earth Earth Surface Atmosphere layer
And refraction effect a so that point light source of script is imaged as an area source for not stopping shake in telescope, and air regards
The influence that Ning Du is imaged earth observation from space and ground space observation is very big, so possessing good platform location makes telescope
With particularly significant, or even in order to avoid platform location seeing, take very big cost and built space solar telescope.
Dome seeing (DOME SEEING) is mainly caused by telescope itself and sight chamber, near telescope due to
Air pressure, humidity variation is all little, mainly has temperature and temperature gradient to cause.The mechanical equipment that telescope control needs, electronics are set
It is standby nearby to will produce many heats.These heat air, if into light path, it will the fluctuation for causing refractive index, from
And resolution ratio is reduced, the physical quantity of the reduction of this resolution ratio, we are known as dome seeing.Dome seeing is excellent for one
Elegant platform location is a kind of huge waste, greatly affected the optical property on the optical path, and there is an urgent need for carry out manual measurement
And improvement.Therefore very important for the detection of dome seeing, it looks in the distance especially for increasing large-scale astronomical
Mirror.
Minute surface seeing is since telescope has bigbore primary mirror, the even sky caused near minute surface of primary mirror uneven heating
Air tightness is uneven, and increasing with the primary mirror of telescope caused by reducing resolution ratio, minute surface seeing is increasingly
It is important.
Wherein atmospheric seeing is generally detected using difference image monitor (DIMM), the original of difference image monitor
Reason is exactly to measure the center of gravity difference for the picture that a celestial body is formed after two separated apertures at telescope entrance pupil
The variance of movement.The image motion of difference can to avoid telescope shake or small error out of focus caused by tracking error, because
This can obtain merely because free atmosphere and cause image quality decline a unbiased estimation.
By the master pattern of Tatarski and the Fried atmospheric seeing set up, Kolmogorov is primarily rested on
The basis about the work of atmospheric turbulance on.DIMM is exactly the master pattern according to seeing, and measurement of Atmospheric Turbulence causes
Error intensity, then predict the Fried parameters r0 and the big overall with of half-shadow (Full Width of the seeing of telescope
Half Maximum, abbreviation FWHM), herein, Fried the parameters r0 and FWHM of seeing are that expression light wave propagation passes through
The most important parameter of the knots modification of turbulent atmosphere.R0 smaller (FWHM is bigger), then turbulent flow is more severe, and seeing is then poorer.
Traditional is placed in DIMM near telescope, is simply possible to use in the platform location air detected outside from celestial body to dome and regards rather
Degree, and currently can not carry out individually accurate assess to seeing in dome both at home and abroad and measure, dome common at present regards peaceful
Degree evaluation result is all to estimate and infer that indirectly dome regards rather by the final performance and platform location seeing of optical system
Degree has the shortcomings that inaccurate, not real-time, measurement physical quantity expression is also inconsistent etc. a variety of.And large telescope increasingly needs
Dome seeing is individually detected, to monitor the disturbance situation of temperature gradient and air-flow in dome, and is regarded in dome
Carry out the dome seeings corrective measures such as further ventilation, refrigeration on the basis of Ning Du.And do not have in telescope dome
The light source target for having similar infinity celestial body necessary to common location seeing detection DIMM, can not continue to apply us
Common DIMM devices.We first proposed the segmented dome seeing detection device based on laser light source herein.
Invention content
It is an object of the present invention to provide a kind of, and the segmentation based on laser light source detects the detection device of dome seeing, the device
Traditional technology " accurately assessment measurement can not be carried out individually to seeing in dome ", " estimation and deduction circle indirectly can be overcome
Top seeing is inaccurate, not real-time, measurement physical quantity expression is inconsistent " the shortcomings of；It is highly suitable for various large aperture telescopes
With the dome seeing detection in various light paths, convenient, flexible segmentation detection can be carried out to complicated optical system light path.
The present invention also provides the working methods of this detection device.
Completing the technical solution of foregoing invention task is：A kind of inspection of the segmentation detection dome seeing based on laser light source
Device is surveyed, for the detection of the dome seeing of large telescope and various complication systems, the present apparatus is positioned over telescope dome
It is interior, which is characterized in that the present apparatus by two laser light sources by the parallel Laser emission of two beams to CCD camera, the CCD camera
Output connects image procossing computer, forms detector.
The parallel laser of two beams is imaged on two laser of formation in CCD camera by the practical light path in telescope dome
Then hot spot uses computer to carry out in-situ analysis to the image position of two laser faculas, solves two laser lights
The movement variance of spot, the resolving using this movement variance as dome seeing detect source.As shown in Figure 1 and Figure 2.
" two parallel laser light sources " can be two lasers, can also two lasers be used one
Half-reflecting half mirror and a laser replace, and can reduce the mutual each germline brought using two lasers in this way
System error.The light that wherein laser is sent out is divided into two by half-reflecting half mirror, wherein it is a branch of again by speculum reflection with thoroughly
The light crossed is parallel, as shown in Figure 2.
The operation principle of the present invention：
Due to heat production when the equipment of telescope dome interior works, local air can be heated, atmospheric density is caused to become
Change so that refractive index changes, and can ceaselessly change, so at picture also can ceaselessly change, show as two pictures
Relative position constantly change, we just using this relative position change variance as seeing evaluation criterion.
There is no light source to be detected in telescope dome interior to overcome, we use two laser light sources as ginseng
It examines, the light source of laser is imaged on the detector.
It is that ideal experimental light sources are beaten in the vacuum condition not disturbed that laser, which has good collimation and stability,
Hot spot on the detector will have good stability.
The pixel size of detector camera is about 10 micron dimensions, we go to measure laser spot position using detector
Change.The wherein center of gravity analysis of laser facula：
A=x1-x2 (5)
B=y1-y2 (6)。
Wherein, I1mnIt is (x on CCD1mn, y1mn) point position light intensity, x1The X-direction that facula mass center is generated for laser 1 is sat
Mark, y1For the coordinate for the facula mass center Y-direction that laser 1 generates, x2The X-direction coordinate of facula mass center, y are generated for laser 22It is sharp
The coordinate for the facula mass center Y-direction that light 2 generates.
Wherein, the variation of a, b are caused by dome seeing, it is possible to use a, movement variance (two hot spots of b
The vertical direction in line direction and two hot spot lines) evaluate seeing.
Completing the technical solution of second invention task of the application is：The above-mentioned segmentation detection dome based on laser light source regards
The working method of the detection device of Ning Du, which is characterized in that steps are as follows：
(1) high frame per second CCD camera is placed on the end of light path by, and laser is equipped in the initial position placement of light path
Light source；
(2) opens laser, adjusts laser intensity and angle, two laser faculas is made approximately parallel to be imaged on positioned at detector
CCD camera detection device center, two representation of laser facula data are obtained using computer in real time；
(3) handles two laser facula barycenter datas and calculates separately two laser facula barycenter relative jitter data；
(4) utilizes the high frame per second detector C CD camera image datas of Matlab calculation processings, and the dome obtained in this section of light path regards rather
Degree.Serial and concurrent dome seeing can be carried out to multistage light path using this method to measure.
The design major requirement needed to be considered of dome seeing tester：
1) the various pieces pedestal of detecting system needs to be fixed on telescope dome, and position is relatively fixed between component, we
What is measured is the variance result of the relative position of imaging of the two beam laser on detector C CD, it would be desirable to avoid system itself
The laser facula that brings of movement move integrally the influence to dome seeing result；
2) detector C CD cameras have preferable resolution ratio, are conducive to improve the precision detected in real time；
3) laser intensity is controlled, in favor of obtaining better hot spot signal-to-noise ratio.
The present invention has filled up the blank of the prior art, the segmentation detection dome seeing based on laser light source provided
Detection device can overcome traditional technology " can not carry out individually accurate assessment to seeing in dome to measure ", " estimation indirectly
With infer dome seeing it is inaccurate, not in real time, to measure physical quantity expression inconsistent " the shortcomings of；It is highly suitable for various big mouths
Dome seeing detection on diameter telescope and various light paths, convenient, flexible can carry out complicated optical system light path
Segmentation detection.The present invention can be measured when realizing the high-precision real of dome seeing in any one section of light path, and can be further
Realize that the serial and parallel dome seeing of multistage in multistage light path finely measures, the evaluation for dome seeing and dome
The evaluation analysis of the optical property of inner optical system is extremely important.
Description of the drawings
Fig. 1 is segmented dome seeing detector design schematic diagram；
Fig. 2 is the dome seeing detector design diagram of optimization；
Fig. 3, Fig. 4 are respectively that image patch seeks center coordination Computing Principle schematic diagram.
Specific implementation mode
Embodiment 1, segmented dome seeing detector are carried out the dome seeing design in Fig. 1, are beaten using laser
Hot spot on detector C CD4 carries out the detection of seeing；Two lasers 1 are placed on the platform of one piece of telescope, laser
The hot spot of generation is imaged on detector C CD4, then the collected signals of detector C CD4 we be transferred on computer 5, I
Carry out barycenter processing using relevant software on computers and barycenter relative displacement is handled, and export final dome
Seeing measurement result.
Embodiment 2, it is substantially the same manner as Example 1, as shown in Fig. 2, in order to avoid the systematic error that two lasers generate,
We use a half-reflecting half mirror 2 and a speculum 3 to replace so that a laser 1 generates two-beam, this two-beam exists
At two hot spots on detector C CD4, then we use 5 gathered data of computer, and barycenter processing and barycenter phase are carried out to data
Offset is handled, and exports final dome seeing measurement result.
Claims (6)
1. a kind of detection device of the segmentation detection dome seeing based on laser light source, the present apparatus are positioned over telescope dome
It is interior, which is characterized in that the present apparatus is by two parallel laser light sources by the parallel Laser emission of two beams to CCD camera, the CCD phases
The output of machine connects image procossing computer, forms detector.
2. the detection device of the segmentation detection dome seeing according to claim 1 based on laser light source, feature exist
In " two laser light sources " is the laser of two generation parallel lasers.
3. the detection device of the segmentation detection dome seeing according to claim 1 based on laser light source, feature exist
In " two laser light sources " is a half-reflecting half mirror and a laser.
4. the detection device of the segmentation detection dome seeing based on laser light source according to one of claim 1-3,
It is characterized in that, the pixel size of CCD camera is big in the detector uses 10 micron dimensions.
5. the working method of the detection device of the segmentation detection dome seeing described in claim 1 based on laser light source,
It is characterized in that, steps are as follows：
(1) high frame per second CCD camera is placed on the end of light path by, and laser is equipped in the initial position placement of light path
Light source；
(2) opens laser, adjusts laser intensity and angle, two laser faculas is made approximately parallel to be imaged on positioned at detector
CCD camera detection device center, two representation of laser facula data are obtained using computer in real time；
(3) handles two laser facula barycenter datas and calculates separately two laser facula barycenter relative jitter data；
(4) utilizes the high frame per second detector C CD camera image datas of Matlab calculation processings, and the dome obtained in this section of light path regards rather
Degree.
6. the work side of the detection device of the segmentation detection dome seeing according to claim 5 based on laser light source
Method, which is characterized in that step (3) in laser facula center of gravity analysis method it is as follows：
A=x1-x2 (5)
B=y1-y2(6)；
Wherein, I1mnIt is (x on CCD1mn, y1mn) point position light intensity, x1The X-direction coordinate of facula mass center, y are generated for laser 11For
The coordinate for the facula mass center Y-direction that laser 1 generates, x2The X-direction coordinate of facula mass center, y are generated for laser 22It is generated for laser 2
Facula mass center Y-direction coordinate, a, b be two facula mass centers X-direction and Y-direction difference.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810007512.9A CN108458856A (en) | 2018-01-04 | 2018-01-04 | The detection device and its method of segmentation detection dome seeing based on laser light source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810007512.9A CN108458856A (en) | 2018-01-04 | 2018-01-04 | The detection device and its method of segmentation detection dome seeing based on laser light source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108458856A true CN108458856A (en) | 2018-08-28 |
Family
ID=63221273
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810007512.9A Pending CN108458856A (en) | 2018-01-04 | 2018-01-04 | The detection device and its method of segmentation detection dome seeing based on laser light source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108458856A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113092075A (en) * | 2021-04-09 | 2021-07-09 | 中国科学院光电技术研究所 | Variable-angle high-precision calibration light source system |
| CN113865518A (en) * | 2021-10-09 | 2021-12-31 | 中国科学院新疆天文台 | Astronomical detection method for included angle between focal plane of large-field telescope and CCD target plane |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1469107A (en) * | 2003-06-06 | 2004-01-21 | 中国科学院安徽光学精密机械研究所 | Measuring device and method for atmosphere coherence length in limited inclined range |
| CN1598482A (en) * | 2004-08-31 | 2005-03-23 | 哈尔滨工业大学 | Satellite light communication high speed tracking detector and its detecting method |
| CN101109817A (en) * | 2007-07-04 | 2008-01-23 | 长春理工大学 | Detecting device for real-time computing facula mass center of field-programmable logic array |
| CN102055537A (en) * | 2010-11-01 | 2011-05-11 | 长春理工大学 | Spot detection method for influences from strong atmospheric turbulance during static wireless laser communication |
| CN102636270A (en) * | 2012-04-09 | 2012-08-15 | 中国人民解放军63655部队 | Optical measurement instrument and method for atmospheric coherent length |
| CN103048701A (en) * | 2012-12-24 | 2013-04-17 | 中国科学院国家天文台南京天文光学技术研究所 | Atmospheric optical parameter measurer for astronomical site survey |
| CN103267969A (en) * | 2013-04-25 | 2013-08-28 | 中国科学院安徽光学精密机械研究所 | Method for measuring atmospheric optical turbulent current profile based on imaging laser radar of laser light beam |
| CN103335816A (en) * | 2013-06-28 | 2013-10-02 | 中国科学院国家天文台南京天文光学技术研究所 | Optical turbulence sensor and method for combining multi-aperture glitter and differential image motion |
| CN203376261U (en) * | 2013-08-05 | 2014-01-01 | 中国人民解放军63655部队 | Real-time measurement device for off-axis atmosphere turbulence intensity profiles |
-
2018
- 2018-01-04 CN CN201810007512.9A patent/CN108458856A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1469107A (en) * | 2003-06-06 | 2004-01-21 | 中国科学院安徽光学精密机械研究所 | Measuring device and method for atmosphere coherence length in limited inclined range |
| CN1598482A (en) * | 2004-08-31 | 2005-03-23 | 哈尔滨工业大学 | Satellite light communication high speed tracking detector and its detecting method |
| CN101109817A (en) * | 2007-07-04 | 2008-01-23 | 长春理工大学 | Detecting device for real-time computing facula mass center of field-programmable logic array |
| CN102055537A (en) * | 2010-11-01 | 2011-05-11 | 长春理工大学 | Spot detection method for influences from strong atmospheric turbulance during static wireless laser communication |
| CN102636270A (en) * | 2012-04-09 | 2012-08-15 | 中国人民解放军63655部队 | Optical measurement instrument and method for atmospheric coherent length |
| CN103048701A (en) * | 2012-12-24 | 2013-04-17 | 中国科学院国家天文台南京天文光学技术研究所 | Atmospheric optical parameter measurer for astronomical site survey |
| CN103267969A (en) * | 2013-04-25 | 2013-08-28 | 中国科学院安徽光学精密机械研究所 | Method for measuring atmospheric optical turbulent current profile based on imaging laser radar of laser light beam |
| CN103335816A (en) * | 2013-06-28 | 2013-10-02 | 中国科学院国家天文台南京天文光学技术研究所 | Optical turbulence sensor and method for combining multi-aperture glitter and differential image motion |
| CN203376261U (en) * | 2013-08-05 | 2014-01-01 | 中国人民解放军63655部队 | Real-time measurement device for off-axis atmosphere turbulence intensity profiles |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113092075A (en) * | 2021-04-09 | 2021-07-09 | 中国科学院光电技术研究所 | Variable-angle high-precision calibration light source system |
| CN113865518A (en) * | 2021-10-09 | 2021-12-31 | 中国科学院新疆天文台 | Astronomical detection method for included angle between focal plane of large-field telescope and CCD target plane |
| CN113865518B (en) * | 2021-10-09 | 2024-02-06 | 中国科学院新疆天文台 | Astronomical detection method for included angle between focal plane of large-view-field telescope and CCD target surface |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Nicolas et al. | A direct approach for instantaneous 3D density field reconstruction from background-oriented schlieren (BOS) measurements | |
| CN104765160B (en) | A kind of light beam bearing calibration system and calibration method | |
| CN106290256B (en) | Quantitative background schlieren method based on video measuring | |
| CN107680156B (en) | Three-dimensional reconstruction method based on polarization information | |
| CN108917943A (en) | A kind of flame temperature field measurement device and method based on projection background stration technique | |
| CN104122077A (en) | Method and device for measuring modulation transfer functions of optic lenses through infinite conjugated light paths | |
| CN114323571B (en) | Multi-optical-axis consistency detection method for photoelectric aiming system | |
| CN105066910B (en) | Electro-optic crystal Z axis deviate angle measuring device and measuring method | |
| Zhang et al. | A novel method for repeatedly generating speckle patterns used in digital image correlation | |
| CN106768882B (en) | Optical system distortion measurement method based on shack-Hartmann wavefront sensor | |
| Thomason et al. | Calibration of a microlens array for a plenoptic camera | |
| Machicoane et al. | A simplified and versatile calibration method for multi-camera optical systems in 3D particle imaging | |
| CN104165598B (en) | Automatic reflection light spot positioning method for large-caliber mirror interferometer vertical type detection | |
| CN109307480A (en) | A kind of transmissive element multi-surface surface testing method | |
| CN108333145A (en) | A kind of the detection new equipment and localization method of ICF pellets | |
| CN109341523A (en) | A kind of point-diffraction interference Three-coordinate measurer probe tip face leveling method | |
| CN104406770B (en) | The distortion measurement device and distortion correction method of wave aberration measurement module | |
| CN109839027A (en) | A kind of test device and method of thermal imaging gun sight dress meter accuracy | |
| CN106500843A (en) | A kind of imaging spectrometer optimum image plane calibration method and device | |
| CN106709955A (en) | Space coordinate system calibrate system and method based on binocular stereo visual sense | |
| CN109990985A (en) | A kind of Chinese character pin-shaped alignment infrared detector modulation transfer function test method | |
| CN108458856A (en) | The detection device and its method of segmentation detection dome seeing based on laser light source | |
| CN105699704B (en) | The imaging automatic regulating apparatus of a kind of white light interference atomic force probe system and control method thereof | |
| CN110132174A (en) | Angel type lobster eye x-ray imaging eyeglass face type test device based on streak reflex method | |
| Réthoré et al. | 3D displacement measurements using a single camera |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180828 |
|
| RJ01 | Rejection of invention patent application after publication |