CN110221444A - Imaging system - Google Patents
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- CN110221444A CN110221444A CN201910492296.6A CN201910492296A CN110221444A CN 110221444 A CN110221444 A CN 110221444A CN 201910492296 A CN201910492296 A CN 201910492296A CN 110221444 A CN110221444 A CN 110221444A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/288—Filters employing polarising elements, e.g. Lyot or Solc filters
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/42—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect
- G02B27/4205—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect having a diffractive optical element [DOE] contributing to image formation, e.g. whereby modulation transfer function MTF or optical aberrations are relevant
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/42—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect
- G02B27/4261—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect having a diffractive element with major polarization dependent properties
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- Optics & Photonics (AREA)
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Abstract
The present invention relates to optical image technology fields, disclose a kind of imaging system, realize the selection of imaging region and the promotion of overall performance with a kind of new light beam deflection way combination light filling.Imaging system of the present invention includes imaging sensor, camera lens and light filling equipment, the light filling equipment, for emitting the light of selected wavelength to target scene when taking pictures；Filtered light beam module and light beam selecting module are equipped in the camera lens；The light beam selecting module realizes the light beam selection and switching to target scene specific region based on polarization grating, and the polarization grating realizes beam diffraction and deflection by the periodic structure of control material；The filtered light beam module is for being filtered the incident light of the non-selection specific region of outer scene；Wherein, diffraction efficiency highest of each polarization grating at correspondence the emitted particular range of wavelengths of light filling equipment in the light beam selecting module, then increases with wavelength offset in its all band and diffraction efficiency reduces.
Description
Technical field
The present invention relates to optical image technology field more particularly to a kind of imaging systems.
Background technique
In recent years, it is had been to be concerned by more and more people about light beam control technique.It is based particularly on new optical devices
The research of light field control technique is the most popular.
Summary of the invention
Present invention aims at a kind of imaging system is disclosed, imaging is realized with a kind of new light beam deflection way combination light filling
The selection in region and the promotion of overall performance.
In order to achieve the above object, the present invention discloses a kind of imaging system, including imaging sensor, camera lens and light filling equipment,
In:
The light filling equipment, for emitting the light of selected wavelength to target scene when taking pictures；
Filtered light beam module and light beam selecting module are equipped in the camera lens；
The light beam selecting module is realized based on polarization grating and the light beam of target scene specific region is selected and switched, institute
It states polarization grating and beam diffraction and deflection is realized by the periodic structure of control material；
The filtered light beam module is for being filtered the incident light of the non-selection specific region of outer scene；
Wherein, in the light beam selecting module each polarization grating in correspondence the emitted particular range of wavelengths of light filling equipment
The diffraction efficiency highest at place, then increases with wavelength offset in its all band and diffraction efficiency reduces.
The invention has the following advantages:
Polarization grating based on light beam selecting module, which is realized, to be selected and switches to the light beam of target scene specific region, externally
The incident light of the non-selection specific region of portion's scene is then aided with filtered light beam module and is filtered；At the same time, also with light filling equipment
Parameter corresponding relationship between wavelength and polarization grating diffraction efficiency forms the specific wavelength light beam choosing of a more multidimensional and closed loop
It takes.Whereby, external ambient light interference has been can effectively avoid, the high-precision for ensuring to be imaged with this；And ensure that different scenes are imaged
Quality matches.
Below with reference to accompanying drawings, the present invention is described in further detail.
Detailed description of the invention
The attached drawing constituted part of this application is used to provide further understanding of the present invention, schematic reality of the invention
It applies example and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is that a kind of light filling equipment disclosed by the embodiments of the present invention selects the coverage area of target scene and the region of camera lens
It selects and switching correspondence diagram.
Fig. 2 and Fig. 3 is the concrete structure schematic diagram of a kind of light beam selecting module and corresponding filtered light beam module.
Specific embodiment
The embodiment of the present invention is described in detail below in conjunction with attached drawing, but the present invention can be defined by the claims
Implement with the multitude of different ways of covering.
Embodiment 1
The present embodiment discloses a kind of imaging system.
The present embodiment imaging system includes imaging sensor, camera lens and light filling equipment.Wherein: light filling equipment is for taking pictures
When, the light of selected wavelength is emitted to target scene；Preferably, the wave-length coverage of the provided light source of light filling equipment is in 700-1600nm
Between, further, the brightness of the light source is adjustable.Filtered light beam module and light beam selecting module are equipped in camera lens；Wherein, light
Beam selecting module is realized based on polarization grating passes through the light beam selection of target scene specific region and switching, the polarization grating
The periodic structure for controlling material realizes beam diffraction and deflection；Filtered light beam module is used for the non-selection given zone of outer scene
The incident light in domain is filtered.
Optionally, coverage area (great circle in corresponding diagram) and camera lens of the present embodiment light filling equipment to target scene
Corresponding relationship between regional choice (4 small circles in corresponding great circle under different switching states) and switching can refer to Fig. 1.
In the present embodiment, each polarization grating is in correspondence the emitted certain wave of light filling equipment in the light beam selecting module
Diffraction efficiency highest at long range, then increases with wavelength offset in its all band and diffraction efficiency reduces.Whereby, it is set with light filling
Parameter corresponding relationship between standby wavelength and polarization grating diffraction efficiency forms the specific wavelength light beam of a more multidimensional and closed loop
It chooses.To the filtering to other wave band light beams to a certain extent, external ambient light interference is effectively prevented, ensures to be imaged with this
High-precision；And ensure the quality matches of different scenes imaging.
Optionally, the present embodiment light beam selecting module includes at least one level one kind lens set, one kind lens set difference at different levels
It is made of a polarization grating and an electrically-controlled liquid crystal box；Each electrically-controlled liquid crystal box is provided at least two states；And institute
In the state set for the electrically-controlled liquid crystal box for having light beam selecting module to arrange, each subsets of states corresponds incomplete outside camera lens respectively
The image region of overlapping；Simultaneously: the light beam selecting module further include: electronic control unit, for program-controlled corresponding described automatically controlled
Liquid crystal cell switches the acquisition for realizing respective image subregion with state, and in the handoff procedure of image region, group does not occur
Relative disPlacement motion between part.
In Fig. 2 and single-stage one kind lens set shown in Fig. 3, electrically-controlled liquid crystal box uses TN structure, and the electrically-controlled liquid crystal of Fig. 2
Box is high-voltage state, and the electrically-controlled liquid crystal box of Fig. 3 is low-voltage state.The TN structure electrically-controlled liquid crystal box under high-voltage state,
Be equivalent to and transmission processing only carried out to light beam, and under low-voltage then by left circularly polarized light be converted into right-circularly polarized light and
Right-circularly polarized light is converted into left circularly polarized light；Corresponding, quarter wave plate is used for the circle of left-handed (i.e. clockwise)
Polarised light converts linearly polarized photon horizontally and is converted into the circularly polarized light of dextrorotation (i.e. counterclockwise) vertically
The linearly polarized photon in direction, linear polarizer use the linear polarizer of horizontal direction, filter out the linear of vertical direction with this
Polarised light.Whereby, so that electrically-controlled liquid crystal box respectively corresponds different two of external image under high-voltage state and low-voltage state
Sub-regions respectively enter camera lens and are ultimately imaged.
As a kind of deformation, the cascade structure of multiple one kind lens sets can realize the multiple to external selection region field angle
Amplification.There is also other various deformations, it is first that concrete scheme can refer to applicant in this case for setting in relation to a kind of lens set
The related patents of application.It does not repeat them here.
It is worth noting that: when this embodiment scheme is applied to the image imaging of two dimension or more, the professions such as especially TOF
Camera needs the two-dimensional array on the pixel energy correspondence image sensor in outer scene.For this purpose, including at least two-stage one
It in the light beam selecting module that the cascade structure of class lens set is constituted, also needs to meet: being protected in the polarization grating angle of diffraction of odd number group
It holds in the same plane, with the Image Acquisition of pixel in a corresponding dimension, such as X-axis；And the polarization grating in even number set
The angle of diffraction be maintained at in the orthogonal another plane of the odd number group polarization grating angle of diffraction, with pixel in another corresponding dimension
The Image Acquisition of point, such as Y-axis.
Optionally, the specific configuration of the present embodiment light beam selecting module can also use following manner comprising:
Rotating device for driving the corresponding single or at least two polarization grating rotations, and then drives polarised light
Grid angle of diffraction rotation, so that the light beam for arriving at described image sensor is rotated with corresponding polarization grating and realized to target scene spy
Determine the light beam selection and switching in region.
Based on the mode of rotating device, it can be achieved that external object field for the mode above by electrically-controlled liquid crystal box
Scape selection region smoothly switches, and outer scene region corresponding to the process of rotation is also continuous.Wherein, it is polarized under the mode
The Essential Action of grating is consistent under above-mentioned electrically-controlled liquid crystal box mode, contributes to diffraction and the deflection of realizing light beam, does not do
It repeats.
Since polarization grating essence is the deflection realized to light beam, in conjunction with the physical parameter and dynamic of such as some deployment
The factors such as focusing and the blind zone problem for be easy to causeing target scene center.Thus, it is preferable that under this kind of rotation mode, in institute
It states and includes at least two two class optical mirror slip groups in light beam selecting module, each two classes optical mirror slip group is by a polarization
Grating and a prism wedge vertical plane (face in so-called vertical plane, that is, cross-sectional image where the line perpendicular with upper and lower both sides) are pasted
Integrator is to synchronize rotation；Wherein, two classes optical mirror slip groups at different levels and other light beam selecting module inner members are specific
At least one set of relative position on (preferably: in specific deployment, with two stage optical lens set for a unit, each unit it
Between arrangement mode it is consistent, and two polarization gratings in each unit are disposed adjacent；And the overall quantity when optical mirror slip group
It is not consistent with the optical mirror slip group on odd level at the arrangement mode of the optical mirror slip group of unit when for odd number) so that it is final go out
The light beam for being incident upon scanning object does not deflect to realize that non-blind area scans.
The solution of above-mentioned blind area its principle is i.e.: the light beam deflection characteristic of cooperation prism wedge itself, in traditional sense
On blind area scanning when, by prism wedge to caused by polarization grating light beam deflection rectified a deviation, efficiently solve single kind
The center blind zone problem of class device scanning；And after scanning through blind area, it is cut by the relative displacement variation between lens set
Change to the scanning in other regions.
Likewise, the cascade structure of multiple two classes optical mirror slip groups can be realized to external selection region as a kind of deformation
The multiple of field angle amplifies.There is also other various deformations, concrete scheme be can refer to for setting in relation to two class optical mirror slip groups
The related patents of applicant in this case's earlier application.It does not repeat them here.
Preferably, in the present embodiment, corresponding the emitted specific wavelength of light filling equipment is additionally provided with before the camera lens
Optical filter at range.
Referring to above-mentioned Fig. 2 and Fig. 3, the filtered light beam module includes linear polarizer, and further includes quarter wave plate.?
In the application of some deformations, and when liquid crystal cell can be integrated with the similar functions of quarter wave plate (such as: the automatically controlled liquid of ECB or OCB structure
Brilliant box), filtered light beam module then refers mainly to linear polarizer.In addition to this, in the camera lens traditional design it is some such as with
Parallel side wall construction of optical path etc. deflects excessive non-targeted field after a part can also be stopped to penetrate the linear polarizer
The incident light of scene area.
In the present embodiment, for light beam when by polarization grating, outgoing beam deflection angle is beam incident angle and polarization grating
The angle of diffraction it is vector superposed.Wherein, the polarization grating in the present embodiment is also used to: in deflection process that incident left-handed circle is inclined
Vibration light is deflected into the right-circularly polarized light of outgoing；And/or
Incident right-circularly polarized light is deflected into the left circularly polarized light of outgoing；And/or
Incident non-polarized light is changed into the opposite left circularly polarized light and right-circularly polarized light of angle of diffraction.
Optionally, the transmitted light beam of the present embodiment polarization grating concentrates on:
Incident left circularly polarized light is deflected into negative one (- 1) order of diffraction；And/or
Incident right-circularly polarized light is deflected into positive (+1) order of diffraction；And/or
Incident non-polarized light is deflected to the left circularly polarized light for the order of diffraction that is positive and the right-hand circular polarization of the negative one order of diffraction
Light.
It is worth noting that: the actual functional capability played by inner stages polarization grating there is some difference property, therefore
"and/or" relationship is used in above-mentioned statement.The otherness is mainly reflected in: for closing on the nearest a kind of lens set of outer scene
Or two class optical mirror slip group polarization grating for, incident light and left circularly polarized light and the dextrorotation of unpolarized state can be existed simultaneously
Circularly polarized light, and then there is typically only left-handed and/or dextrorotation circularly polarized lights to the polarization grating of other grades.It is such description for
For those skilled in the art, corresponding technology is clear in fact rather than is easy to produce ambiguity, subsequent not repeat them here.
Optionally, the present embodiment polarization grating optical property modified material can be made of liquid crystal, liquid crystal polymer.Alternatively,
The polarization grating optical property modified material can be surpassed surface by metal or the super surface of medium is made.Wherein, super surface be it is a kind of by
A series of sub-wavelengths artificial micro-structure composition ultra-thin two-dimension array plane, have make it is relatively easy, loss it is relatively low,
The characteristics such as small in size and thickness ultrathin, may be implemented having for the amplitude to electromagnetic wave, phase, communication mode, polarization state etc.
Effect regulation.
To sum up, imaging system disclosed in the present embodiment, has the advantages that
Polarization grating based on light beam selecting module, which is realized, to be selected and switches to the light beam of target scene specific region, externally
The incident light of the non-selection specific region of portion's scene is then aided with filtered light beam module and is filtered；At the same time, also with light filling equipment
Parameter corresponding relationship between wavelength and polarization grating diffraction efficiency forms the specific wavelength light beam choosing of a more multidimensional and closed loop
It takes.Whereby, external ambient light interference has been can effectively avoid, the high-precision for ensuring to be imaged with this；And ensure that different scenes are imaged
Quality matches.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (12)
1. a kind of imaging system, including imaging sensor, camera lens and light filling equipment, it is characterised in that:
The light filling equipment, for emitting the light of selected wavelength to target scene when taking pictures；
Filtered light beam module and light beam selecting module are equipped in the camera lens；
The light beam selecting module is realized based on polarization grating and the light beam of target scene specific region is selected and switched, described inclined
The grating that shakes passes through the periodic structure realization beam diffraction of control material and deflection；
The filtered light beam module is for being filtered the incident light of the non-selection specific region of outer scene；
Wherein, in the light beam selecting module each polarization grating at correspondence the emitted particular range of wavelengths of light filling equipment
Diffraction efficiency highest, then increases with wavelength offset in its all band and diffraction efficiency reduces.
2. imaging system according to claim 1, which is characterized in that the light beam selecting module includes at least one level one kind
Lens set, one kind lens sets at different levels are made of a polarization grating and an electrically-controlled liquid crystal box respectively；Each electrically-controlled liquid crystal box
It is provided at least two states；And in the state set of the electrically-controlled liquid crystal box in the arrangement of all light beam selecting modules, each state subgroup
Collection corresponds the image region being not exclusively overlapped outside camera lens respectively；And the light beam selecting module further include:
Electronic control unit switches the acquisition for realizing respective image subregion for the program-controlled corresponding electrically-controlled liquid crystal box with state,
And in the handoff procedure of image region, not relative disPlacement motion between generating assembly.
3. imaging system according to claim 2, which is characterized in that the light beam selecting module includes that at least two-stage is a kind of
The cascade structure of lens set, and in the cascade structure:
It is kept in the same plane in the polarization grating angle of diffraction of odd number group；And
The polarization grating angle of diffraction of even number set be maintained at in the orthogonal another plane of the odd number group polarization grating angle of diffraction.
4. imaging system according to claim 1, which is characterized in that the light beam selecting module includes:
Rotating device for driving the corresponding single or at least two polarization grating rotations, and then drives polarization grating to spread out
Firing angle rotation, so that the light beam for arriving at described image sensor is rotated with corresponding polarization grating and realized to target scene given zone
The light beam in domain selects and switching.
5. imaging system according to claim 4, which is characterized in that include at least two in the light beam selecting module
Two class optical mirror slip groups, each two classes optical mirror slip group are bonded by a polarization grating with a prism wedge vertical plane
One is to synchronize rotation；
Wherein, two classes optical mirror slip groups at different levels and other light beam selecting module inner members are in specific at least one set of relative position
On, so that the light beam for being finally emitted to scanning object does not deflect to realize that non-blind area scans.
6. imaging system according to claim 1, which is characterized in that be additionally provided with the corresponding light filling before the camera lens
Optical filter at the emitted particular range of wavelengths of equipment.
7. imaging system according to claim 1, which is characterized in that the filtered light beam module includes linear polarizer.
8. imaging system according to claim 6, which is characterized in that the filtered light beam module further includes quarter wave plate.
9. imaging system according to any one of claims 1 to 8, which is characterized in that the polarization grating is also used to: deflecting
Incident left circularly polarized light is deflected into the right-circularly polarized light of outgoing in the process；And/or
Incident right-circularly polarized light is deflected into the left circularly polarized light of outgoing；And/or
Incident non-polarized light is changed into the opposite left circularly polarized light and right-circularly polarized light of angle of diffraction.
10. imaging system according to claim 9, which is characterized in that the transmitted light beam of the polarization grating concentrates on:
Incident left circularly polarized light is deflected into the negative one order of diffraction；And/or
Incident right-circularly polarized light is deflected into a positive order of diffraction；And/or
Incident non-polarized light is deflected to the left circularly polarized light for the order of diffraction that is positive and the right-circularly polarized light of the negative one order of diffraction.
11. imaging system according to claim 10, which is characterized in that the polarization grating optical property modified material by
Liquid crystal, liquid crystal polymer are made.
12. imaging system according to claim 10, which is characterized in that the polarization grating optical property modified material can
Surface is surpassed by metal or the super surface of medium is made.
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| CN113075691A (en) * | 2020-01-03 | 2021-07-06 | 华为技术有限公司 | TOF depth sensing module and image generation method |
| CN113075641A (en) * | 2020-01-03 | 2021-07-06 | 华为技术有限公司 | TOF depth sensing module and image generation method |
| CN113946034A (en) * | 2021-11-08 | 2022-01-18 | 中国科学院光电技术研究所 | Broadband chiral spectral analysis and large-field-of-view imaging system and design method |
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| CN116095506B (en) * | 2021-11-05 | 2024-05-17 | 中兴通讯股份有限公司 | Imaging control method, equipment, mobile terminal and storage medium |
| CN113946034A (en) * | 2021-11-08 | 2022-01-18 | 中国科学院光电技术研究所 | Broadband chiral spectral analysis and large-field-of-view imaging system and design method |
| CN113946034B (en) * | 2021-11-08 | 2023-09-19 | 中国科学院光电技术研究所 | Broadband chiral spectrum analysis and large-view-field imaging system and design method |
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| Publication number | Publication date |
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| CN110221444B (en) | 2021-03-26 |
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