CN106918845A - The active azimuthal measurement apparatus of long distance laser half based on Polarization Detection - Google Patents
The active azimuthal measurement apparatus of long distance laser half based on Polarization Detection Download PDFInfo
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- CN106918845A CN106918845A CN201710308205.XA CN201710308205A CN106918845A CN 106918845 A CN106918845 A CN 106918845A CN 201710308205 A CN201710308205 A CN 201710308205A CN 106918845 A CN106918845 A CN 106918845A
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- quarter wave
- azimuthal measurement
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- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V8/00—Prospecting or detecting by optical means
- G01V8/10—Detecting, e.g. by using light barriers
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Abstract
The active azimuthal measurement apparatus of long distance laser half based on Polarization Detection, are related to distant object orientation detection technical field.The present invention is that input signal can be flooded by system noise when carrying out distant object orientation detection to solve existing laser azimuth measurement apparatus, influences the problem of the detectivity of laser azimuth measurement apparatus.The active azimuthal measurement apparatus of long distance laser half based on Polarization Detection of the present invention, a quarter wave plate, No. two quarter wave plates and four-quadrant polarizer are sequentially provided with before the optical lens group of the active azimuthal measurement apparatus of conventional laser half, and four-quadrant polarizer is adjacent with optical lens group, No. two quarter wave plates only cover the first quartile of four-quadrant polarizer and the first quartile of APD detectors.The present invention is applied to carries out distant object orientation detection.
Description
Technical field
The invention belongs to distant object orientation detection technical field.
Background technology
The current active azimuthal measurement apparatus of laser half use direct detection pattern, i.e.,：System input swashs for target scattering
The energy of optical echo, is output as Warhead deflection angle value.When laser azimuth measurement apparatus carry out distant object orientation detection,
Target scattering laser echo signal is extremely faint, can be flooded by system noise.Now, system noise particularly sunlight background spoke
Noise is penetrated, the detectivity of laser azimuth measurement apparatus has been had a strong impact on.
The content of the invention
The present invention is input signal when carrying out distant object orientation detection to solve existing laser azimuth measurement apparatus
Can be flooded by system noise, influence the problem of the detectivity of laser azimuth measurement apparatus, now provided based on Polarization Detection
The active azimuthal measurement apparatus of long distance laser half.
The active azimuthal measurement apparatus of long distance laser half based on Polarization Detection, including the active azimuthal measurement of conventional laser half
Device, the active azimuthal measurement apparatus of the conventional laser half include optical lens group 4, APD detectors 5 (avalanche photodetector)
And servo-drive system；
1, No. two quarter wave plates 2 of a quarter wave plate and four-quadrant polarizer 3, and four-quadrant are sequentially provided with before optical lens group 4
Limit polarizer 3 is adjacent with optical lens group 4,
No. two quarter wave plates 2 only cover the first quartile of four-quadrant polarizer 3 and the first quartile of APD detectors 5.
The polarization direction of four quadrants of four-quadrant polarizer 3 is separate.
If signal light polarization direction is α, background radiation light polarization direction is β, the active azimuthal measurement of long distance laser half dress
It is R to put with detection target range, and the polarization direction of four-quadrant polarizer 3 is respectively θ1、θ2、θ3And θ4,
Then signal light intensity I received on the photosurface of APD detectors 5s-APDWith background radiation luminous intensity Ib-APDRespectively
For：
Wherein, IsTo be incident to a flashlight light intensity for quarter wave plate 1, IbTo be incident to a background spoke for quarter wave plate 1
Penetrate light light intensity, n=1,2,3,4.
It is incident to the background radiation light light intensity I for being incident upon a quarter wave plate 1bFor：
Ib=Ip+Io
Wherein, IpIt is the light intensity of polarized portion in background radiation light, IoRepresent the light of unpolarized part in background radiation light
By force.
The active azimuthal measurement apparatus of long distance laser half based on Polarization Detection of the present invention, by conventional laser
In azimuthal measurement apparatus add quarter wave plate and four-quadrant polarizer, simple structure, additionally it is possible to increase azimuthal measurement apparatus effect away from
From, effectively suppress background radiation noise, especially sunlight background radiation noise, system signal noise ratio is significantly improved, improve laser side
Level measuring arrangement long-range detection ability.The present invention is applied to carries out distant object orientation detection.
Brief description of the drawings
Fig. 1 is the structural representation of the active azimuthal measurement apparatus of long distance laser half based on Polarization Detection of the present invention
Figure.
Specific embodiment
Because the polarization direction of the background radiation light of different places is different, before target acquisition is carried out, can measured in advance
The polarization direction of background radiation light, the flashlight of the appropriate polarization direction of reselection carries out target acquisition, you can effectively to suppress
Background radiation light, improves system signal noise ratio and long-range target acquisition ability.Based on above-mentioned principle, the present invention utilizes following implementation
Mode is described in detail.
Specific embodiment one：Reference picture 1 illustrates present embodiment, described in present embodiment based on Polarization Detection
The active azimuthal measurement apparatus of long distance laser half, including active azimuthal measurement apparatus of conventional laser half, the conventional laser half
Active azimuthal measurement apparatus include optical lens group 4, APD detectors 5 (avalanche photodetector) and servo-drive system；
Quarter wave plate is sequentially provided with before the optical lens group 4 of the active azimuthal measurement apparatus of conventional laser half 1, No. two 1/4
Wave plate 2 and four-quadrant polarizer 3, and four-quadrant polarizer 3 is adjacent with optical lens group 4,
No. two quarter wave plates 2 only cover the first quartile of four-quadrant polarizer 3 and the first quartile of APD detectors 5.
In present embodiment, a quarter wave plate 1 is used to change the polarization characteristic of incident light；No. two quarter wave plates 2 are used to disappear
Except the singularity of systematic survey matrix；Four-quadrant polarizer 3 is used to reduce the light intensity of background radiation light；No. two quarter wave plates 2 and four
Quadrant polarizer 3 collectively constitutes the Polarization Detection structure of laser azimuth measurement apparatus；Optical lens group 4 is used for incident light rays
Onto ADP photosurfaces；APD detectors 5 are used to for incident light energy to be converted into four road electric signals.
In practical application, flashlight passes sequentially through 1, No. two quarter wave plates 2, four-quadrant of a quarter wave plate with background radiation light
Limit polarizer 3 and optical lens group 4 are transmitted through on the photosurface of APD detectors 5, and APD detectors 5 send to servo electric signal
System.The active azimuthal measurement apparatus simple structure of long distance laser half based on Polarization Detection described in present embodiment, only needs
Wave plate and polarizer are added in conventional laser azimuthal measurement apparatus, you can to effectively improve system signal noise ratio, increase orientation is surveyed
Measure the operating distance of device.
Specific embodiment two：Present embodiment be to described in specific embodiment one based on the remote of Polarization Detection
The active azimuthal measurement apparatus of laser half are described further, in present embodiment, four polarizations of quadrant of four-quadrant polarizer 3
Direction is separate.
Specific embodiment three：Present embodiment be to described in specific embodiment one based on the remote of Polarization Detection
The active azimuthal measurement apparatus of laser half are described further, in present embodiment,
If signal light polarization direction is α, background radiation light polarization direction is β, the active azimuthal measurement of long distance laser half dress
It is R to put with detection target range, and the polarization direction of four-quadrant polarizer 3 is respectively θ1、θ2、θ3And θ4,
Then signal light intensity I received on the photosurface of APD detectors 5s-APDWith background radiation luminous intensity Ib-APDRespectively
For：
Wherein, IsTo be incident to a flashlight light intensity for quarter wave plate 1, IbTo be incident to a background spoke for quarter wave plate 1
Penetrate light light intensity, n=1,2,3,4.
According to the active azimuthal measurement apparatus system of long distance laser half (i.e.：1, No. two quarter wave plates 2, four of a number quarter wave plate
Quadrant polarizer 3, optical lens group 4 and APD detectors 5 composition system architecture) calculation matrix conditional number minimum value determine
The polarization direction of four-quadrant polarizer 3 is (i.e.：θ1、θ2、θ3And θ4Value), further according to being incident to the active orientation of long distance laser half
The polarization direction β of the background radiation light of measurement apparatus*, selection is with suitable polarization direction α*Flashlight, you can to obtain：
Ib-APD<Ib (1)
Formula (1) illustrates that bias light is suppressed, and formula (2) illustrates to improve the active azimuthal measurement of long distance laser half
The signal to noise ratio of device, i.e., the background radiation light for effectively inhibiting laser azimuth measurement apparatus to receive improves azimuthal measurement dress
The signal to noise ratio put, improves laser azimuth measurement apparatus target acquisition ability.
Specific embodiment four：Present embodiment be to described in specific embodiment three based on the remote of Polarization Detection
The active azimuthal measurement apparatus of laser half are described further, and in present embodiment, are incident to the background for being incident upon a quarter wave plate 1
Radiant light light intensity IbFor：
Ib=Ip+Io
Wherein, IpIt is the light intensity of polarized portion in background radiation light, IoRepresent the light of unpolarized part in background radiation light
By force.
Background radiation light is partial poolarized light, and the light intensity of background radiation light can be expressed as polarized light intensity with unpolarized light intensity
(i.e. remaining light intensity) sum, and polarized light intensity is the half of total bias light light intensity.
Claims (4)
1. the active azimuthal measurement apparatus of long distance laser half based on Polarization Detection, including the active azimuthal measurement of conventional laser half dress
Put, the active azimuthal measurement apparatus of the conventional laser half include optical lens group (4), APD detectors (5) and servo-drive system, its
It is characterised by,
A quarter wave plate (1), No. two quarter wave plates (2) and four-quadrant polarizer (3) are sequentially provided with before optical lens group (4), and
Four-quadrant polarizer (3) is adjacent with optical lens group (4),
No. two quarter wave plates (2) only cover the first quartile of four-quadrant polarizer (3) and the first quartile of APD detectors (5).
2. active azimuthal measurement apparatus of long distance laser half based on Polarization Detection according to claim 1, its feature exists
In the polarization direction of four quadrants of four-quadrant polarizer (3) is separate.
3. active azimuthal measurement apparatus of long distance laser half based on Polarization Detection according to claim 1, its feature exists
In,
If signal light polarization direction is α, background radiation light polarization direction is β, and the polarization direction of four-quadrant polarizer (3) is respectively
θ1、θ2、θ3And θ4,
Then signal light intensity I received on APD detectors (5) photosurfaces-APDWith background radiation luminous intensity Ib-APDRespectively：
Wherein, IsTo be incident to a flashlight light intensity for quarter wave plate (1), IbTo be incident to a background spoke for quarter wave plate (1)
Penetrate light light intensity, n=1,2,3,4.
4. active azimuthal measurement apparatus of long distance laser half based on Polarization Detection according to claim 3, its feature exists
In,
It is incident to a background radiation light light intensity I for quarter wave plate (1)bFor：
Ib=Ip+Io
Wherein, IpIt is the light intensity of polarized portion in background radiation light, IoRepresent the light intensity of unpolarized part in background radiation light.
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| CN201710308205.XA CN106918845B (en) | 2017-05-04 | 2017-05-04 | Half active azimuthal measurement apparatus of long distance laser based on Polarization Detection |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996012941A1 (en) * | 1994-10-21 | 1996-05-02 | Therma-Wave, Inc. | Spectroscopic ellipsometer |
| US6128080A (en) * | 1997-06-06 | 2000-10-03 | Wyatt Technology Corporation | Extended range interferometric refractometer |
| CN101319958A (en) * | 2008-07-16 | 2008-12-10 | 中国科学院上海光学精密机械研究所 | Quarter-wave plate fast axis direction real-time measurement apparatus and method |
| CN105241450A (en) * | 2015-09-30 | 2016-01-13 | 中国人民解放军国防科学技术大学 | Sky polarization mode detection method and system based on four-quadrant polaroid |
-
2017
- 2017-05-04 CN CN201710308205.XA patent/CN106918845B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996012941A1 (en) * | 1994-10-21 | 1996-05-02 | Therma-Wave, Inc. | Spectroscopic ellipsometer |
| US6128080A (en) * | 1997-06-06 | 2000-10-03 | Wyatt Technology Corporation | Extended range interferometric refractometer |
| CN101319958A (en) * | 2008-07-16 | 2008-12-10 | 中国科学院上海光学精密机械研究所 | Quarter-wave plate fast axis direction real-time measurement apparatus and method |
| CN105241450A (en) * | 2015-09-30 | 2016-01-13 | 中国人民解放军国防科学技术大学 | Sky polarization mode detection method and system based on four-quadrant polaroid |
Non-Patent Citations (3)
| Title |
|---|
| KYUNGHOON JUNG .ET AL: "Positioning accuracy improvement of laser navigation using UKF and FIS", 《ROBOTICS AND AUTONOMOUS SYSTEMS》 * |
| 孟祥盛: "偏振技术在激光引信抗烟雾干扰中的应用分析", 《红外与激光工程》 * |
| 李慧 等: "干扰和噪声对激光制导性能及精度的影响", 《红外与激光工程》 * |
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