CN205607626U - Measure device of remote sensing instrument's linear polarization sensitivity - Google Patents
Measure device of remote sensing instrument's linear polarization sensitivity Download PDFInfo
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- CN205607626U CN205607626U CN201620318416.2U CN201620318416U CN205607626U CN 205607626 U CN205607626 U CN 205607626U CN 201620318416 U CN201620318416 U CN 201620318416U CN 205607626 U CN205607626 U CN 205607626U
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- remote sensing
- sensing instrument
- linear polarization
- polarizer
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Abstract
The utility model discloses a measure device of remote sensing instrument's linear polarization sensitivity. This measuring device includes light source, collimating lens group, the first polarizer, the second polarizer, photoelectric detector, the inclined to one side beam expanding lens of guarantor and remote sensing instrument. The light beam carries out the linearly polarized light modulation via two polarizers to detect remote sensing instrument's linear polarization sensitivity. Methods of measurement does: 1 )A declination degree of two polarizers of accurate calibration, 2 )The rotatory second polarizer to utilize remote sensing instrument to carry out the light intensity detection, calculate remote sensing instrument's relative optics efficiency curve, 3 )Change a declination degree of the first polarizer, repeat 2) obtain many optics efficiency curves, integrate the sensitivity of data calculation linear polarization. Provided is an it is clear and definite that the advantage lies in transmitting polarized state of light, and the accurate description of available formula need not to move back inclined to one side processing, has overcome and has moved back the big shortcoming of linear polarization sensitivity measuring error that inclined to one side effect difference band comes, is applicable to precision measurement remote sensing instrument's linear polarization sensitivity.
Description
Technical field
This patent relates to polarized spectrum technology field, is specifically related to a kind of linear polarization measuring remote sensing instrument sensitive
The device of degree.
Background technology
What polarization sensitivity described is the optical system of the instrument sensitivity to the polarization state of incident illumination, and it is anti-
Reflect: when the polarization state of incident illumination changes, the change of output intensity from system.Retouch actual
When stating the Polarization-Sensitive characteristic of optical system, carry out sign system frequently with linear polarization sensitivity (LPS)
Polarization sensitivity, it is defined as: when a branch of complete line polarized light incides in an optical system, entering
During the polarization direction rotation turnback of ray polarized light, if the maximum of exiting light beam intensity and minima
It is respectively ImaxAnd Imin, then the mathematic(al) representation of linear polarization sensitivity is: LPS=(Imax-Imin)/(Imax+Imin)。
The polarization state of the radiant light of ground object target itself comprises abundant information, but for some remote sensing instrument
From the point of view of be but an important interference information, as atmosphere reflection light polarization state change for Ocean Color Remote Sensing
It is the biggest distracter from the point of view of the water colour information inverting of instrument, therefore needs to control well linear polarization sensitivity.Formerly
During the remote sensing instrument entered is developed, often using linear polarization sensitivity as an important technical specification, typically come
Say and wish that its value is the smaller the better.In the polarization sensitivity measurement scheme of traditional remote sensing instrument, generally require
Light source elder generation depolarization is become nature light or pseudo-natural light so that it is the light strongly consistent on each polarization direction, then
It is polarized via the polarizer and obtains the line polarized light that each polarization direction light intensity is the same, for polarizer rotation process
The light intensity change that middle remote sensing instrument detects just can reflect the linear polarization sensitivity characteristic of instrument itself.So
And, in this scheme, the degree of polarization impact of light source is very big, the general light being difficult to obtain perfect zero degree of polarization,
The measurement of instrument line polarization sensitivity is brought the biggest uncertainty by this, typically has the absolute measuring of about 1%
Amount error.It addition, for the measurement scheme using birefringence crystal depolarizer, there is also what light beam separated
Problem, is not suitable for long-range optical path.
Summary of the invention
This patent purpose is to propose the device of a kind of linear polarization sensitivity measuring remote sensing instrument, Ke Yishi
Existing higher linear polarization sensitivity certainty of measurement, reduces the uncertainty measured.
The device of a kind of linear polarization sensitivity measuring remote sensing instrument that this patent proposes, it is characterised in that bag
Include: light source 1, collimation lens set 2, first polarizer, 3, second polarizer 4, photodetector 5, guarantor
Beam expanding lens 6 and remote sensing instrument 7 partially；The collimated battery of lens of light 2 that light source 1 sends collimates, with collimation
Light outgoing, carries out the modulation of line polarized light via first polarizer 3 and second polarizer 4, and by light electrical resistivity survey
Survey device 5 and complete calibration, then expand via the inclined beam expanding lens 6 of guarantor, finally enter remote sensing instrument 7, inspection
Survey the linear polarization sensitivity of remote sensing instrument 7.The polarization state of light beam transmitting procedure in measurement apparatus changes such as
Shown in Fig. 2.
Described light source 1 is white light, monochromatic light or spectral modulation light.
Described collimation lens set 2 is achromat group, and controls veiling glare via diaphragm.
Described first polarizer 3, second polarizer 4 is Glan-Thompson prism or Glan-Taylor prism,
It is arranged on the control carrying out polarizing angle degree α and β on the axle center of hollow electrical turntable；
Described photodetector 5 detection area is more than beam cross section, receives light beam completely, for detachable peace
Dress；
The light of the inclined beam expanding lens of described guarantor 6 is distributed in 0～15 ° of ranges of incidence angles, and mirror surface is coated with silver
Film adds the guarantor inclined film system of medium protection film；
The feature of the measuring method of the device of the linear polarization sensitivity measuring remote sensing instrument that this patent proposes exists
In comprising following measuring process:
1) photodetector 5 is put into the position in light path, record the turntable angle of described first polarizer 3
Degree, is set to position, α=0, rotates described second polarizer 4 and records the light intensity song changed along with rotation
Line, this curve is the trigonometric function curve being polarized angle about second polarizer 4, utilizes trigonometric function matching
Or polarization extinction two polarizers of principle accurate calibration be polarized angle, note extinction angle be β=90 ° or
270 ° of positions；
2) photodetector 5 is unloaded, fix the angle [alpha] that is polarized of described first polarizer 3, rotate institute
State second polarizer 4, utilize remote sensing instrument 7 to measure and obtain the song that each remote sensing passage light intensity changes along with β angle
Line Iout(β), according to Malus' law, it is known that the optical efficiency σ of remote sensing instrument to be measured 7 is proportional to
Iout(β)/cos2(β-α), i.e. σ=A Iout(β)/cos2(β-α), A is weight, it is possible to obtain the phase of remote sensing instrument 7
To optical efficiency curve；
3) conversion α value takes multiple measurements, and for identical β angle, σ is constant and is set to baseline optical
Efficiency, opening relationships formula can obtain the relativeness of weight A of different α angle, and then obtain β change
Sample light transmission efficiency curve relative value during 180 °, if maximum is σmax, minima is σmin,
Then the linear polarization sensitivity of remote sensing instrument 7 is LPS=(σmax-σmin)/(σmax+σmin)。
Compared with prior art, this patent has the advantage that
1) being not required to carry out depolarization process, do not have the measuring uncertainty that depolarization not exclusively causes, certainty of measurement is high；
2) complete polarized light transmission, it is possible to achieve clear and definite formula is expressed, and is conducive to analyzing Measuring origin；
3) there is not measuring beam segregation phenomenon, can be used for long-range light path and measure.
Accompanying drawing explanation
Fig. 1 is the apparatus structure schematic diagram of the linear polarization sensitivity measuring remote sensing instrument, and in figure, 1 is light source,
2 for collimation lens set, 3 be first polarizer, 4 be second polarizer, 5 for photodetector, 6 for protect
Partially beam expanding lens, 7 be remote sensing instrument.
Fig. 2 is the polarization state change of light beam transmitting procedure in measurement apparatus, and in figure, 8 for through collimation thoroughly
Partial polarized light after mirror group 2,9 be through the first polarizer 3 rear polarizer angle be the line polarized light of α,
10 for through the second polarizer 4 rear polarizer angle be the line polarized light of β.
Detailed description of the invention
Below according to example, specific implementation of the patent mode is described.
As it is shown in figure 1, measurement apparatus includes light source 1, collimation lens set 2, first polarizer 3, second
Partially device 4, photodetector 5, protect inclined beam expanding lens 6 and remote sensing instrument 7.Light source 1 uses Ou Silang 12v75w
Halogen light, corresponding power is stabilized current supply, and light source short time unstability is less than 0.1%, and signal to noise ratio is more than
1000:1；Collimation lens set 2 is the achromat group of fused quartz and calcium fluoride lens composition, achromatism model
Enclose 400-900nm；First polarizer 3 and second polarizer 4 use Glan-Taylor prism that calcite makes,
Being separately mounted on the turntable quill shaft that stepper motor controls, the rotational angle repeatable accuracy of turntable is better than 1 '；
Light beam clear aperture after collimation is less than or equal to 10mm；Photodetector 5 uses the silicon detector of unit,
Test surface elemental size is 10mm bore；Protect inclined beam expanding lens 6 for Cassegrain's structure, light be as the criterion straight go out,
Beam size after expanding is maximum up to 300mm, and reflecting mirror plates Ag, Al2O3And SiO2Guarantor the most anti-
Penetrate film system, it is ensured that arbitrarily the polarization sensitivity of the work incidence angle degree of light is less than 0.1%.By remote sensing to be measured
Instrument 7 is arranged on position shown in Fig. 1, makes light beam enter in the field range of remote sensing instrument 7, such that it is able to
Obtain the light intensity value of each detecting band.
Before starting to measure the linear polarization sensitivity of remote sensing instrument 7, need to carry out two polarizers is polarized angle
Calibration, step is as follows: install photodetector 5, set the current angular of the first polarizer 3 turntable as
Position, α=0 °, rotates described second polarizer 4 and records the light rotated along with second polarizer 4 and change
Strong curve, this curve is the trigonometric function curve being polarized angle beta about second polarizer 4, is entered by this curve
Row normalized, then curve becomes as cos2Beta function curve, utilizes trigonometric function curve matching permissible
The accurately position at β angle, school, note extinction angle is β=90 ° or 270 ° of positions, so that it is determined that the reference angle of β
Degree position；Fix first polarizer 3 and arrive αnAngle, then rotate β angle, recording light electric explorer 5 with
The light intensity curve at β angle, and be normalized, then the curve after normalization is function cos2(β-αn)
Function curve, can obtain normalized weight is C simultaneouslyn, thus complete first polarizer 3 and second and be polarized
The calibration of device 4.
Uninstall detector 5, directly can obtain the light intensity detection value of each remote sensing passage from remote sensing instrument,
First first polarizer 3 is forwarded to position, α=45 °, rotates β angle, it is possible to obtain the arbitrarily light intensity at β angle is visited
Measured value Iout(β), according to Malus' law, it is known that the optical efficiency σ of remote sensing instrument to be measured is proportional to
Iout(β)/cos2(β-α), i.e. σ=A Iout(β)/cos2(β-α), A is weight；Set the optical efficiency σ of β=90 °
It is 1, then can obtain weight A during α=45 °45Opposing optical efficiency curve.By first polarizer 3 turns
To position, α=135 °, repeat above measurement, equally the optical efficiency σ of β=90 ° be set to 1, it is possible to obtain
Obtain weight A during α=135 °135And opposing optical efficiency curve.Now, α=45 ° and α=135 ° state
The opposing optical efficiency curve that lower measurement obtains is same curves, is distributed according to the signal to noise ratio of curve and takes
House, for 0 °≤β≤90 °, take the opposing optical efficiency curve of α=45 °, for 90 °≤β≤180 °, take α=
The opposing optical efficiency curve of 135 °, thus obtain the optical efficiency curve of the remote sensing instrument of 0 °≤β≤180 °.
If maximum is σmax, minima is σmin, then the linear polarization sensitivity of remote sensing instrument 7 is
LPS=(σmax-σmin)/(σmax+σmin)。
Claims (6)
1. measure a device for the linear polarization sensitivity of remote sensing instrument, including light source (1), collimation lens set (2), first polarizer (3), second polarizer (4), photodetector (5), protect inclined beam expanding lens (6) and remote sensing instrument (7)；It is characterized in that:
The collimated battery of lens of the light (2) that light source (1) sends collimates, with collimated light outgoing, the modulation of line polarized light is carried out via first polarizer (3) and second polarizer (4), and completed calibration by photodetector (5), then expand via the inclined beam expanding lens of guarantor (6), finally enter remote sensing instrument (7), the linear polarization sensitivity of detection remote sensing instrument (7).
The device of the linear polarization sensitivity of measurement remote sensing instrument the most according to claim 1, it is characterised in that: described light source (1) is white light, monochromatic light or spectral modulation light.
The device of the linear polarization sensitivity of measurement remote sensing instrument the most according to claim 1, it is characterised in that: described collimation lens set (2) is achromat group, and controls veiling glare via diaphragm.
The device of the linear polarization sensitivity of measurement remote sensing instrument the most according to claim 1, it is characterized in that: described first polarizer (3) and second polarizer (4) are Glan-Thompson prism or Glan-Taylor prism, are arranged on the control carrying out polarizing angle degree α and β on the axle center of hollow electrical turntable.
The device of the linear polarization sensitivity of measurement remote sensing instrument the most according to claim 1, it is characterised in that: described photodetector (5) detection area is more than beam cross section, receives light beam completely, for detachable installation.
The device of the linear polarization sensitivity of measurement remote sensing instrument the most according to claim 1; it is characterized in that: the light of the inclined beam expanding lens of described guarantor (6) is distributed in 0～15 ° of ranges of incidence angles, mirror surface is coated with silverskin and adds the guarantor inclined film system of medium protection film.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620318416.2U CN205607626U (en) | 2016-04-15 | 2016-04-15 | Measure device of remote sensing instrument's linear polarization sensitivity |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105758625A (en) * | 2016-04-15 | 2016-07-13 | 中国科学院上海技术物理研究所 | Device and method for measuring linear polarization sensitivity of remote sensing instrument |
| CN106706273A (en) * | 2017-01-19 | 2017-05-24 | 中国科学院上海技术物理研究所 | Polarized radiation calibration device and realization method thereof |
| CN108955579A (en) * | 2018-08-06 | 2018-12-07 | 深圳精创视觉科技有限公司 | A kind of high-precision optical film absorption axiss measuring device |
-
2016
- 2016-04-15 CN CN201620318416.2U patent/CN205607626U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105758625A (en) * | 2016-04-15 | 2016-07-13 | 中国科学院上海技术物理研究所 | Device and method for measuring linear polarization sensitivity of remote sensing instrument |
| CN105758625B (en) * | 2016-04-15 | 2018-10-19 | 中国科学院上海技术物理研究所 | A kind of device and method for the linear polarization sensitivity measuring remote sensing instrument |
| CN106706273A (en) * | 2017-01-19 | 2017-05-24 | 中国科学院上海技术物理研究所 | Polarized radiation calibration device and realization method thereof |
| CN108955579A (en) * | 2018-08-06 | 2018-12-07 | 深圳精创视觉科技有限公司 | A kind of high-precision optical film absorption axiss measuring device |
| CN108955579B (en) * | 2018-08-06 | 2024-05-24 | 深圳精创视觉科技有限公司 | High-precision optical film absorption axis measuring device |
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