CN109581295A - A kind of four-quadrant photodetection positioning optical system for inhibiting atmospheric turbulance to influence - Google Patents
A kind of four-quadrant photodetection positioning optical system for inhibiting atmospheric turbulance to influence Download PDFInfo
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- CN109581295A CN109581295A CN201910037604.6A CN201910037604A CN109581295A CN 109581295 A CN109581295 A CN 109581295A CN 201910037604 A CN201910037604 A CN 201910037604A CN 109581295 A CN109581295 A CN 109581295A
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- optical system
- influence
- quadrant
- lens module
- atmospheric turbulance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/16—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using electromagnetic waves other than radio waves
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
The present invention realizes that the four-quadrant photodetection for inhibiting atmospheric turbulance to influence positions optical system, comprising: bandpass filter, bifocal mould group, photodetector.Current four-quadrant optical system uses single focal lense or lens group, when detection distant object, atmosphere convection are strong, since the influence of turbulent flow causes the target angular position accuracy of measurement to be deteriorated.With it is existing using the technical solution of single focus optical system compared with, present invention employs Two Spot optical systems, and the placement location by selection four-quadrant photo detector between two focuses of optical system, keep preceding defocus consistent with spot size caused by rear defocus, position coincides.Statistic fluctuation of the spot intensity between different quadrants caused by being influenced for atmospheric turbulance, the intensity fluctuation of two hot spots as caused by preceding defocus and rear defocus is symmetrical with respect to spot center, it cancels out each other, can effectively inhibit influence of the atmospheric turbulance to accuracy of measurement.
Description
Technical field
It is especially a kind of for the remote of the fields such as laser guidance or laser communication the present invention relates to a kind of optical system
Four-quadrant photodetection positions optical system.
Background technique
As a kind of common position sensitive detector, four-quadrant photo detector be widely used in laser alignment, angle measurement, from
In the precision photodetector system such as motion tracking.Four-quadrant photo detector is by four photosensitive units by quadrant position composition of relations
Made of, receiving optics is formed when work hot spot.Hot spot makes each photosensitive unit all export a signal, according to hot spot
Position is different, and each photosensitive unit output signal is of different sizes, and by signal processing, the angle position information of target can be obtained.
According to the position sensing principle of four-quadrant photo detector, optical system requires imaging facula rounding, uniformly.At present
Four-quadrant optical system generally use single focal lense or lens group, by Defocusing design on four-quadrant photo detector shape
At circular light spot.When this design and atmosphere close in detection range is in quiet stable state, available uniform circular light spot.So
And when detection distant object, atmosphere convection are strong, due to the influence of turbulent flow, the spot intensity of formation goes out between different quadrants
Existing statistic fluctuation causes the target angular position accuracy of measurement to be deteriorated.This phenomenon is located at 4 quadrant detector center in hot spot
It is become apparent when position is nearby and target is located in optical axis small angle range.
In laser guidance and laser communication field, since detection range is remote, and carrying platform is generally in high-speed motion
The influence of state, atmospheric turbulance is more violent, realizes that the four-quadrant photodetection for inhibiting turbulence effect positions optical system especially
It is necessary.
Summary of the invention
The present invention realizes that the four-quadrant photodetection for inhibiting atmospheric turbulence effect positions optical system, can effectively promote four
The positional accuracy of Quadrant photo detection system.
Optical system disclosed by the invention, comprising: bandpass filter (1), lens module (2), photodetector (3).Show
Intention is shown in attached drawing 1.
Lens module (2) can usually use Fresnel Lenses, obtain two by odd loop and even loop staggered designs
Focus, schematic diagram are shown in attached drawing 2.Lens module (2) can also realize that schematic diagram is shown in attached drawing 3 using double light path lens group mode.
The placement location of photodetector (3) is between two focuses of lens module (2).If lens module focus 1 is right
Answer focal length f1, the corresponding focal length f2 of lens module focus 2；Detector photosurface is to 1 distance d1 of focus, to the distance d2 of focus 2；Then
Detector placement location meets formula d1/f1=d2/f2.
With it is existing using the technical solution of single focus optical system compared with, present invention employs Two Spot optical systems, and
By placement location of the selection four-quadrant photo detector between two focuses of optical system, make produced by preceding defocus and rear defocus
Spot size it is consistent, position coincides.Statistics of the spot intensity between different quadrants caused by influencing for atmospheric turbulance rises
It falling, the intensity fluctuation of two hot spots as caused by preceding defocus and rear defocus is symmetrical with respect to spot center, it cancels out each other,
Influence of the atmospheric turbulance to accuracy of measurement can effectively be inhibited.
Detailed description of the invention
Fig. 1 is that four-quadrant photodetection disclosed by the invention positions schematic diagram of optical system.
Fig. 2 is to realize bifocal mould group schematic diagram using Fresnel Lenses.
Fig. 3 is to realize bifocal mould group schematic diagram using double light path.
In figure: 1 bandpass filter；2 lens modules；3 photodetectors；4 bifocus Fresnel Lenses；5 semi-transparent semi-reflecting lens
1；6 total reflective mirrors 1；7 total reflective mirrors 2；8 convex lenses 1；9 convex lenses 2；10 semi-transparent semi-reflecting lens 2.
Claims (3)
1. a kind of four-quadrant photodetection for inhibiting atmospheric turbulance to influence positions optical system, it is characterised in that:
It 1) include bandpass filter (1), lens module (2), photodetector (3)；
2) lens module (2) is the positive lens mould group with 2 focuses；
3) placement location of the photodetector (3) is between two focuses of lens module (2), if lens module (2) is burnt
Point F1 corresponds to focal length f1, and lens module (2) focus F2 corresponds to focal length f2, and detector photosurface to focus F1 distance d1 arrives focus
The distance d2 of F2, then detector placement location meets formula d1/f1=d2/f2.
2. a kind of four-quadrant photodetection for inhibiting atmospheric turbulance to influence as described in claim 1 positions optical system, special
Sign is: the lens module (2) is realized using Fresnel Lenses, takes different focal length staggered designs by odd loop and even loop
Obtain two focuses.
3. a kind of four-quadrant photodetection for inhibiting atmospheric turbulance to influence as described in claim 1 positions optical system, special
Sign is: the lens module (2) uses double light design, merges into coaxial beam after realization different focal length and obtains two cokes
Point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910037604.6A CN109581295A (en) | 2019-01-15 | 2019-01-15 | A kind of four-quadrant photodetection positioning optical system for inhibiting atmospheric turbulance to influence |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910037604.6A CN109581295A (en) | 2019-01-15 | 2019-01-15 | A kind of four-quadrant photodetection positioning optical system for inhibiting atmospheric turbulance to influence |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109581295A true CN109581295A (en) | 2019-04-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910037604.6A Pending CN109581295A (en) | 2019-01-15 | 2019-01-15 | A kind of four-quadrant photodetection positioning optical system for inhibiting atmospheric turbulance to influence |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111123241A (en) * | 2020-01-14 | 2020-05-08 | 西安深瞳智控技术有限公司 | Large-aperture follow-up laser semi-active guide lens detection system and method |
| US20230018632A1 (en) * | 2021-07-15 | 2023-01-19 | Leviton Manufacturing Co., Inc. | Methods and arrangements for an occupancy sensor |
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Cited By (2)
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|---|---|---|---|---|
| CN111123241A (en) * | 2020-01-14 | 2020-05-08 | 西安深瞳智控技术有限公司 | Large-aperture follow-up laser semi-active guide lens detection system and method |
| US20230018632A1 (en) * | 2021-07-15 | 2023-01-19 | Leviton Manufacturing Co., Inc. | Methods and arrangements for an occupancy sensor |
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Application publication date: 20190405 |
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