CN109459739B - Stray light eliminating device - Google Patents
Stray light eliminating device Download PDFInfo
- Publication number
- CN109459739B CN109459739B CN201811376182.7A CN201811376182A CN109459739B CN 109459739 B CN109459739 B CN 109459739B CN 201811376182 A CN201811376182 A CN 201811376182A CN 109459739 B CN109459739 B CN 109459739B
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- China
- Prior art keywords
- extinction
- stray light
- lens
- cylinder wall
- diaphragm
- 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.)
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- 230000008033 biological extinction Effects 0.000 claims abstract description 146
- 230000003287 optical effect Effects 0.000 claims abstract description 17
- 230000008030 elimination Effects 0.000 claims description 5
- 238000003379 elimination reaction Methods 0.000 claims description 5
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims 2
- 235000017491 Bambusa tulda Nutrition 0.000 claims 2
- 241001330002 Bambuseae Species 0.000 claims 2
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims 2
- 239000011425 bamboo Substances 0.000 claims 2
- 230000000694 effects Effects 0.000 abstract description 5
- 229910003460 diamond Inorganic materials 0.000 description 7
- 239000010432 diamond Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 1
- 230000005499 meniscus Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
Classifications
-
- 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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/4804—Auxiliary means for detecting or identifying lidar signals or the like, e.g. laser illuminators
-
- 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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
- G01S7/4816—Constructional features, e.g. arrangements of optical elements of receivers alone
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Optics & Photonics (AREA)
- Light Receiving Elements (AREA)
Abstract
The application relates to a stray light eliminating device, comprising: the device comprises a extinction cavity, a receiving lens arranged in the extinction cavity, a receiving element arranged outside the extinction cavity, and an extinction diaphragm and an extinction cylinder wall which are arranged in the extinction cavity; the receiving lens, the receiving element and the extinction cylinder wall are positioned on the same optical axis; the extinction diaphragm is positioned in a focus area of the receiving lens, and a light passing hole is formed in the axis position of the extinction diaphragm; the extinction cylinder wall is positioned between the extinction diaphragm and the receiving element. The stray light eliminating device provided by the application can enable the eliminating effect of stray light to be better, and the received signal light beam is better.
Description
Technical Field
The invention relates to the field of radars, in particular to a stray light eliminating device.
Background
At present, a receiving sensor used in most laser radars is sensitive, and the higher the sensitivity of the receiving sensor is, the better the receiving signal reflected by a target object is. However, the higher the sensitivity of the sensor device, the higher the requirement for stray light cancellation of the receiving device.
The traditional method for eliminating stray light is to carry out anodic oxidation black treatment on the surface of the cavity cylinder, and the method can only eliminate a small part of stray light and has poor effect.
Disclosure of Invention
Accordingly, it is necessary to provide a stray light eliminating device for solving the above problems, so as to weaken the influence of stray light on the laser radar receiving signal and improve the signal receiving capability of the laser radar receiving system.
A stray light abatement device comprising: the device comprises a extinction cavity, a receiving lens arranged in the extinction cavity, a receiving element arranged outside the extinction cavity, and an extinction diaphragm and an extinction cylinder wall which are arranged in the extinction cavity; the receiving lens, the receiving element and the extinction cylinder wall are positioned on the same optical axis;
the extinction diaphragm is positioned in a focus area of the receiving lens, and a light passing hole is formed in the axis position of the extinction diaphragm;
the extinction cylinder wall is positioned between the extinction diaphragm and the receiving element.
The stray light eliminating device provided by the embodiment comprises an extinction cavity, a receiving lens arranged in the extinction cavity, a receiving element arranged outside the extinction cavity, an extinction diaphragm arranged in the extinction cavity and an extinction cylinder wall; the receiving lens, the receiving element and the extinction cylinder wall are positioned on the same optical axis; the extinction diaphragm is positioned in a focus area of the receiving lens, and a light passing hole is formed in the axis position of the extinction diaphragm; the extinction cylinder wall is positioned between the extinction diaphragm and the receiving element. The signal beam is scattered to an extinction diaphragm through a receiving lens, then passes through a light-passing hole and is scattered to an extinction cylinder wall, the signal beam is firstly eliminated once through an extinction cavity, then a part of stray light is reflected through the extinction diaphragm, and finally the rest of stray light is led out through the extinction cylinder wall; by the device of the embodiment, the stray light eliminating effect is better, and the received signal light beam is better.
In one embodiment, the surface of the extinction diaphragm facing the receiving lens is in a diamond structure.
In one embodiment, the surface angle of the diamond-shaped structure is 90 °.
In the above embodiment, the surface of the extinction diaphragm facing the receiving lens is in a diamond structure, and the surface angle of the diamond structure is 90 °, so that a light beam with a light divergence angle greater than the receiving view angle of the receiving lens can be reflected into the extinction cavity to be absorbed, and stray light with a part of light divergence angle greater is eliminated.
In one embodiment, the extinction cylinder wall is provided with a plurality of polygonal through holes.
In one embodiment, the polygonal through holes are of a trapezoid structure.
In one embodiment, the closer the polygonal through hole is to the optical axis, the larger the aperture of the polygonal through hole is.
In the embodiment, the extinction cylinder wall is in a trapezoid shape which takes the optical axis as a central line and is vertically symmetrical, a plurality of polygonal through holes are formed in the extinction cylinder wall, and the caliber of the polygonal through holes is larger as the extinction cylinder wall is closer to the optical axis; the extinction cylinder wall has light guiding property according to the structural characteristics, and the disordered light is guided out of the extinction cylinder wall to be absorbed in the extinction cavity, so that the rest part of stray light is eliminated, and the received signal light beam is better in quality.
In one embodiment, the diameter of the matting cylinder wall is larger than the outer diameter of the receiving element.
In one embodiment, the difference between the aperture of the extinction cylinder wall and the outer diameter of the receiving element is less than a preset threshold.
In this embodiment, the aperture of the extinction cylinder wall is larger than the outer diameter of the receiving element, so that the stray light is scattered into the extinction cavity, and if the aperture of the extinction cylinder wall is smaller than the outer diameter of the receiving element, the stray light is led into the receiving element.
In one embodiment, the interior surface of the matting cavity is an anodized black treated surface.
In one embodiment, the receiving lens is any one of a plano-convex lens, a biconvex lens, a spherical lens, an aspherical lens, a free-form surface lens, and a lens group.
In this embodiment, the inner surface of the extinction cavity is the surface after the anodic oxidation black treatment, and can absorb stray light according to the material characteristics thereof.
The stray light eliminating device provided by the invention comprises an extinction cavity, a receiving lens arranged in the extinction cavity, a receiving element arranged outside the extinction cavity, an extinction diaphragm arranged in the extinction cavity and an extinction cylinder wall, wherein the extinction diaphragm is arranged in the extinction cavity; the receiving lens, the receiving element and the extinction cylinder wall are positioned on the same optical axis; the extinction diaphragm is positioned in a focus area of the receiving lens, and a light passing hole is formed in the axis position of the extinction diaphragm; the extinction cylinder wall is positioned between the extinction diaphragm and the receiving element. In the embodiment, the signal beam is scattered to the extinction diaphragm through the receiving lens and then passes through the light passing hole to be scattered to the extinction cylinder wall; the signal beam is firstly eliminated once through the extinction cavity, then a part of stray light is reflected through the extinction diaphragm, and finally the residual stray light is led out through the extinction cylinder wall; by the device of the embodiment, the stray light eliminating effect is better, and the received signal light beam is better.
Drawings
Fig. 1 is a schematic diagram of a stray light eliminating device according to an embodiment of the present application;
fig. 2 is a schematic working diagram of a stray light eliminating device according to an embodiment of the present application;
fig. 3 is a cross-sectional view of a extinction cylinder wall according to an embodiment of the present application.
Reference numerals illustrate:
1: a extinction cavity;
2: a receiving lens;
3: a receiving element;
4: extinction diaphragm;
5: extinction cylinder wall;
41: a light-transmitting hole;
51: polygonal through holes.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
Fig. 1 is a schematic diagram of a stray light eliminating device according to an embodiment of the present application, as shown in fig. 1, where the stray light eliminating device includes: the device comprises a extinction cavity 1, a receiving lens 2 arranged in the extinction cavity, a receiving element 3 arranged outside the extinction cavity, an extinction diaphragm 4 arranged in the extinction cavity and an extinction cylinder wall 5; the receiving lens 2, the receiving element 3 and the extinction cylinder wall 5 are positioned on the same optical axis; the extinction diaphragm 4 is positioned in the focal area of the receiving lens 2, and the extinction diaphragm 4 is provided with a light-passing hole 41 at the axis position; the extinction cylinder wall 5 is located intermediate the extinction diaphragm 4 and the receiving element 3.
The extinction cavity 1 is used for absorbing stray light and fixing the receiving lens 2, and the receiving lens 2 is arranged at the front end of the extinction cavity 1 and is used for converging light; alternatively, the receiving lens 2 may be a biconvex lens, a plano-convex lens, or a meniscus lens, and the present embodiment is not limited. The receiving element 3 is arranged outside the extinction cavity 1 and behind the focal length of the receiving lens 2; the receiving element 3 is a sensitive photosensor element, which may be a photodiode, a photoresistor, a photodiode or a phototransistor, and the present embodiment is not limited. The extinction diaphragm 4 and the extinction cylinder wall 5 are both arranged in the extinction cavity 1, the extinction diaphragm 4 is positioned in the focus area of the receiving lens 2, and the extinction diaphragm 4 is provided with a light-transmitting hole 41 at the axial position; the extinction diaphragm 4 does not limit the signal beam in the optical system, but only partially limits light energy entering from outside the field of view and stray light reflected and scattered inside the lens. The extinction cylinder wall 5 is positioned between the extinction diaphragm 4 and the receiving element 3; the receiving lens 2, the receiving element 3 and the extinction cylinder wall 5 are located on the same optical axis.
Fig. 2 is a schematic working diagram of a stray light eliminating device, wherein the light beam entering the receiving lens 2 includes an effective information light beam and a stray light beam; the stray light beam includes a beam whose ray divergence angle is larger than the receiving angle of view of the receiving lens 2, and a ray which has no significant directivity and is disordered. As shown in fig. 2, the signal beam passes through the receiving lens 2, enters the extinction cavity 1, and is converged in the focal area of the receiving lens 2, namely, the light-passing hole 41 area of the extinction diaphragm 4, in the process, the extinction cavity 1 absorbs a part of stray light, and the extinction diaphragm 4 reflects the beam with the light divergence angle larger than the receiving view angle of the receiving lens 2 to the extinction cavity 1, so that the stray light with the light divergence angle larger than the receiving view angle of the receiving lens 2 is eliminated; the signal beam passes through the light passing hole 41 and enters the extinction cylinder wall 5, the extinction cylinder wall 5 guides out the disordered light beam into the extinction cavity 1, and further the disordered stray light is eliminated, and finally the high-quality signal beam is obtained and transmitted to the receiving element 3.
In the stray light eliminating device in the above embodiment, the signal beam is scattered to the extinction diaphragm through the receiving lens 2, and then is scattered to the extinction cylinder wall 5 through the light passing hole 41; the signal light beam firstly passes through the extinction cavity 1 for one time, then part of stray light is reflected by the extinction diaphragm 4, and finally the rest stray light is led out through the extinction cylinder wall 5, so that the elimination effect of the stray light is better, and the signal light beam received by the receiving element 3 is better.
In one embodiment, the surface of the extinction diaphragm 4 facing the receiving lens 2 has a diamond structure; alternatively, the surface angle of the diamond-shaped structure is 90 °.
In this embodiment, the surface of the extinction diaphragm 4 facing the receiving lens 2 has a diamond structure; the surface angle of the diamond structure is 90 degrees, and according to the structural characteristics, the diamond structure can limit light beams emitted from outside the view angle, stray light reflected by the inside of the lens and the like, for example, light beams with the light divergence angle larger than the receiving view angle of the receiving lens are reflected into the extinction cavity to be absorbed, so that part of stray light is eliminated.
Fig. 3 is a cross-sectional view of a matt cylinder wall provided in an embodiment of the present application, optionally, in one embodiment, a plurality of polygonal through holes 51 are formed in the matt cylinder wall 5; the polygonal through hole 51 has a trapezoid structure; the closer the polygonal through hole 51 is to the optical axis, the larger the aperture of the polygonal through hole 51 is.
In the above embodiment, the extinction cylinder wall 5 is cylindrical, the extinction cylinder wall 5 is provided with a plurality of polygonal through holes 51 with different sizes, the aperture of the polygonal through holes 51 close to the optical axis is larger, and the aperture of the polygonal through holes 51 far from the optical axis is smaller, so that the extinction cylinder wall is of a trapezoid structure; the closer the polygonal through hole 51 is to the optical axis, the larger the aperture of the polygonal through hole 51 is. According to the structural characteristics, when the signal beam passes through the extinction cylinder wall 5, disordered light is emitted out of the polygonal through hole 51 of the extinction cylinder wall 5, and the polygonal through hole 51 is of a trapezoid structure, so that the light is difficult to reflect back into the extinction cylinder wall 5 from the smaller end of the caliber after entering from the larger end of the caliber, and the influence of stray light on the signal beam is eliminated, so that the signal beam is better in quality.
Specifically, as shown in fig. 1, the diameter of the extinction cylinder wall 5 is larger than the outer diameter of the receiving element 3; the difference between the aperture of the extinction cylinder wall 5 and the outer diameter of the receiving element 3 is smaller than a preset threshold value.
In this embodiment, the aperture of the extinction cylinder wall 5 is larger than the outer diameter of the receiving element 3, so that stray light led out of the extinction cylinder wall 5 is scattered into the extinction cavity 1, and if the aperture of the extinction cylinder wall 5 is smaller than the outer diameter of the receiving element 3, the stray light is led into the receiving element 3, thereby affecting the signal quality. A threshold value may be preset to control the pore size of the extinction cylinder wall 5. For example, if the threshold value is set to 2cm, the difference between the aperture of the extinction cylinder wall 5 and the outer diameter of the receiving element 3 is smaller than 2cm, and the size of the aperture of the extinction cylinder wall 5 can be determined.
In one embodiment, the inner surface of the extinction cavity 1 is an anodized black surface.
In this embodiment, the inner surface of the extinction cavity 1 is anodized to black, so that part of stray light can be absorbed, the signal beam enters the extinction cavity 1 through the receiving lens 2, and the stray light of the signal beam is eliminated for the first time by the inner surface of the extinction cavity 1.
In one embodiment, the receiving lens 2 is optionally any one of a plano-convex lens, a biconvex lens, a spherical lens, an aspherical lens, a free-form surface lens, and a lens group.
In the present embodiment, the receiving lens 2 may be any convex lens that functions as a light condensing, such as a plano-convex lens, a biconvex lens, a spherical lens, an aspherical lens, a free-form surface lens, or a convex lens group, a biconvex lens group, a spherical lens group, an aspherical lens group, a free-form surface lens group, or the like.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (9)
1. A stray light abatement device comprising: the device is characterized by further comprising an extinction diaphragm and an extinction cylinder wall which are arranged in the extinction cavity; the receiving lens, the receiving element and the extinction cylinder wall are positioned on the same optical axis;
the extinction diaphragm is positioned in a focus area of the receiving lens, and a light passing hole is formed in the extinction diaphragm at the axis position of the optical axis;
the extinction section of thick bamboo wall is located extinction diaphragm with receiving element is middle, and a plurality of polygon through-holes have been seted up on the extinction section of thick bamboo wall.
2. The stray light eliminating device according to claim 1, wherein a face of the extinction diaphragm facing the receiving lens is of a diamond-shaped structure.
3. The stray light elimination device according to claim 2, wherein the surface angle of the diamond-shaped structure is 90 °.
4. A stray light elimination device according to any of claims 1-3 wherein said polygonal through hole is of trapezoidal configuration.
5. The stray light eliminating apparatus according to claim 4, wherein the closer the polygonal through hole is to the optical axis, the larger the aperture of the polygonal through hole is.
6. A stray light elimination device according to any of claims 1 to 3 wherein the aperture of said extinction cylinder wall is larger than the outer diameter of said receiving element.
7. The stray light elimination device according to claim 6, wherein a difference between an aperture of the extinction cylinder wall and an outer diameter of the receiving element is smaller than a preset threshold.
8. A stray light eliminating apparatus according to any one of claims 1 to 3, wherein the inner surface of the extinction chamber is an anodized black surface.
9. The stray light removing device according to any one of claims 1 to 3, wherein the receiving lens is any one of a plano-convex lens, a biconvex lens, a spherical lens, an aspherical lens, a free-form surface lens, and a lens group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811376182.7A CN109459739B (en) | 2018-11-19 | 2018-11-19 | Stray light eliminating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811376182.7A CN109459739B (en) | 2018-11-19 | 2018-11-19 | Stray light eliminating device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109459739A CN109459739A (en) | 2019-03-12 |
| CN109459739B true CN109459739B (en) | 2024-02-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811376182.7A Active CN109459739B (en) | 2018-11-19 | 2018-11-19 | Stray light eliminating device |
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| Country | Link |
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| CN (1) | CN109459739B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111257233A (en) * | 2020-03-24 | 2020-06-09 | 河南中原光电测控技术有限公司 | Extinction device |
| CN114383731A (en) * | 2020-10-20 | 2022-04-22 | 热映光电股份有限公司 | Infrared sensing module and forehead temperature measuring device |
| CN113376845B (en) * | 2021-06-21 | 2022-03-18 | 中国工程物理研究院激光聚变研究中心 | Stray light absorbing device |
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|---|---|---|---|---|
| CN1410756A (en) * | 2002-11-14 | 2003-04-16 | 上海交通大学 | Particle radius, concentration photosensor |
| CN101762873A (en) * | 2010-01-15 | 2010-06-30 | 浙江大学 | Cassegrain for enhancing stray light-extinction effect and improved-type imaging system thereof |
| CN204718931U (en) * | 2015-05-12 | 2015-10-21 | 杜晨光 | A kind of high-precision microminiaturized particulate matter sensors |
| CN108594263A (en) * | 2018-01-30 | 2018-09-28 | 北醒（北京）光子科技有限公司 | A kind of laser radar and Unmanned Systems |
| CN209979837U (en) * | 2018-11-19 | 2020-01-21 | 深圳市速腾聚创科技有限公司 | Stray light eliminating device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009028861B4 (en) * | 2009-08-25 | 2015-03-05 | Trimble Jena Gmbh | Measuring device with reduced amount of stray light and manufacturing method for this |
-
2018
- 2018-11-19 CN CN201811376182.7A patent/CN109459739B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1410756A (en) * | 2002-11-14 | 2003-04-16 | 上海交通大学 | Particle radius, concentration photosensor |
| CN101762873A (en) * | 2010-01-15 | 2010-06-30 | 浙江大学 | Cassegrain for enhancing stray light-extinction effect and improved-type imaging system thereof |
| CN204718931U (en) * | 2015-05-12 | 2015-10-21 | 杜晨光 | A kind of high-precision microminiaturized particulate matter sensors |
| CN108594263A (en) * | 2018-01-30 | 2018-09-28 | 北醒（北京）光子科技有限公司 | A kind of laser radar and Unmanned Systems |
| CN209979837U (en) * | 2018-11-19 | 2020-01-21 | 深圳市速腾聚创科技有限公司 | Stray light eliminating device |
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| CN109459739A (en) | 2019-03-12 |
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