CN109708763A - Based on microlens array transmitting-receiving bidirectional continuous scanning near infrared imaging system - Google Patents
Based on microlens array transmitting-receiving bidirectional continuous scanning near infrared imaging system Download PDFInfo
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- CN109708763A CN109708763A CN201910097747.6A CN201910097747A CN109708763A CN 109708763 A CN109708763 A CN 109708763A CN 201910097747 A CN201910097747 A CN 201910097747A CN 109708763 A CN109708763 A CN 109708763A
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- microlens array
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- lenticule
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Abstract
The invention belongs to optical technical fields, to overcome existing infrared imaging system working field of view small, the disadvantages of system structure is complicated, and environmental suitability is not strong.For this purpose, the technical solution adopted by the present invention is that, it is based on microlens array transmitting-receiving bidirectional continuous scanning near infrared imaging system, including for four tunnel emission systems of beam shaping, three-chip type microlens array, reception object lens and infrared detector；The emission system emits the light beam Jing Guo shaping, passes through three-chip type microlens array with 1.06 ° of field angles, becomes the big visual-field beam for staring field angle at 0 °~10 ° scanning field of view angles and setting；The object of light beam irradiation certain distance, diffusing reflection then occurs, microlens array is returned with aforementioned scanning field of view angle and the light beam for staring field angle, by the reception of lenticule, become light beam identical with transmitting terminal field angle, it then passes through and receives object lens focusing, on the detector by object imaging.Present invention is mainly applied to optical imagery occasions.
Description
Technical field
The invention belongs to optical technical field, it is more particularly related to the scanning optics based on microlens array, especially
It is related to a kind of near infrared imaging optical system that transmitting-receiving bidirectional continuous scanning is carried out based on microlens array.
Background technique
Infrared imaging has a wide range of applications in national defence, and infrared imaging is divided to active and two kinds of passive type again.Passively
Formula infrared imaging needs specific environmental condition that could work normally, and the self-contained transmitting terminal of active infra-red imaging system,
Environment is practical.
There are two types of the implementations of infrared imaging: scan-type and non-scanning type.Non-scanning type infrared imaging system is to guarantee
Normal spatial resolution, working field of view are small；Scan-type infrared optical system has the advantages that take into account high-resolution and big visual field.
There are many implementation of light beam scanning, such as optical lens scanning, prism scanning, scanning mirror, holoscan, sound
Optical scanning, lenticule scanning etc..Wherein optical lens scanning, prism scanning, scanning mirror are traditional optical scanners,
They belong to mechanical scan, achieve the purpose that light beam deflects by optical elements such as tilting mirror, pendulum mirror, galvanometers.Mechanical scan
System is able to carry out polarizers of big angle scope scanning, but system bulk is big, heavy, power consumption is big.And holoscan, acousto-optic scanning category
In electronic type scanner, scanning speed can be very high, and light beam can be directed toward any point in scanning space, it does not include any machine
Tool motion parts, but the disadvantage is that, scanning angle is small, and light transmission rate is low, and beam quality is poor, and power consumption is big.
Microminiaturization and intelligence are the trend of modern development in science and technology, and the development of microelectronics promotes the development of micro-optics.
The characteristics of micro optical element is that small in size, light-weight, design freedom is big, can integrate, can array etc..The application of micro-optics is very
Extensively, gradual index lens, continuous surface type diffraction optical element, binary optical elements, microlens array etc. can be fabricated to.
Wherein microlens array has in micro-optical systems important and is widely applied, such as light imaging, beam shaping, light data transmission
With light beam scanning etc..
Summary of the invention
In order to overcome the deficiencies of the prior art, the present invention is directed to propose it is a kind of continuous based on microlens array progress transmitting-receiving bidirectional
The near infrared imaging optical system of scanning, it is intended to overcome existing infrared imaging system working field of view small, system structure is complicated, environment
The disadvantages of adaptability is not strong.For this purpose, the technical solution adopted by the present invention is that, it is close based on microlens array transmitting-receiving bidirectional continuous scanning
Infrared imaging system, including for four tunnel emission systems of beam shaping, three-chip type microlens array, reception object lens and infrared spy
Survey device；The emission system emits the light beam Jing Guo shaping, passes through three-chip type microlens array with 1.06 ° of field angles, becomes 0 °
The big visual-field beam for staring field angle at~10 ° of scanning field of view angles and setting；The light beam irradiates the object of certain distance, then
Diffusing reflection occurs, microlens array is returned to aforementioned scanning field of view angle and the light beam for staring field angle, by the reception of lenticule,
Become light beam identical with transmitting terminal field angle, then pass through and receive object lens focusing, on the detector by object imaging.
The entry port of the microlens array unit and the clear aperture of exit ports are equal.
Further, the microlens array passes through the micro-displacement of its third piece scanning mirror, rises in transmitting optical path
To the effect of continuous deflection light beam, play the role of continuously selecting visual field in receiving light path.
Further, the structure of the microlens array unit is so that the Kepler of field lens is added and looks in the distance structure as original
Type.
Further, the microlens array is square array, and receiving area is the inscribed circle of square array, emitter region
Domain is in remaining four corners.
Further specifically, microlens array includes lenticule A, B, C, in receiving light path, 0 °~10 ° scanning field of view
Light beam from the left side incidence, lenticule A convergent beam, lenticule B is field lens, effect be to force down meeting at Polaroid face
The angle of focal beam chief ray；The focal length of lenticule A and lenticule B are all f1, lenticule C is subjected to displacement with respect to lenticule A, B,
When microlens array will receive, and field angle is the beam collimation of ω, by geometric optical theory obtain micro-displacement Δ=
f1tanω。
The features of the present invention and beneficial effect are:
The present invention receives the method for sharing microlens array using transmitting, real by the micro-displacement between microlens array
Existing light beam deflection (transmitting) and visual field selection (reception).The system layout is compact, and structure is simple, and the displacement stroke of scanning mirror compared with
Small, for solving the contradiction between the big visual field of optical system and high-resolution, improving Performance of Optical System has certain meaning.
Detailed description of the invention:
Fig. 1 is the near infrared imaging provided in an embodiment of the present invention that transmitting-receiving bidirectional continuous scanning is carried out based on microlens array
The topology layout schematic diagram of optical system.
Fig. 2 is schematic diagram of the microlens array provided in an embodiment of the present invention in receiving light path --- it is general that opening for field lens is added
Le is looked in the distance structure.
Fig. 3 is the transmitting and receiving aperture area schematic of microlens array provided in an embodiment of the present invention
Fig. 4 is provided in an embodiment of the present invention when the third piece of microlens array moves up certain displacement, transmitting light
The schematic diagram that visual field chief ray is deflected into 10 ° is stared on road.
Fig. 5 is provided in an embodiment of the present invention when the third piece of microlens array moves down certain displacement, reception light
Road selects scanning field of view for the schematic diagram of 10 ° of light beam.
In figure: 1 is the four tunnel emission systems for beam shaping, and 2 be microlens array, and A, B are respectively microlens array
Fixed mirror, C are microlens array moving lens, and 3 is receive object lens, and 4 be infrared detector.
Specific embodiment
The present invention provides a kind of near infrared imaging optical systems that transmitting-receiving bidirectional continuous scanning is carried out based on microlens array
System, which is characterized in that including for four tunnel emission systems of beam shaping, three-chip type microlens array, receive object lens and infrared
Detector；The emission system emits the light beam Jing Guo shaping, passes through three-chip type microlens array with 1.06 ° of field angles, becomes
0 °~10 ° scanning field of view angles and 1.06 ° stare the big visual-field beam of field angle；The light beam irradiates the object of certain distance, with
After diffusing reflection occurs, with aforementioned scanning field of view angle and stare field angle light beam return microlens array, by connecing for lenticule
It receives, becomes light beam identical with transmitting terminal field angle, then pass through and receive object lens focusing, on the detector by object imaging.
Further, the entry port of the microlens array unit and the clear aperture of exit ports are equal, can be with
Avoid light beam crosstalk between different lenticule units, caused by energy loss or generate stray light.
Further, the microlens array passes through the micro-displacement of its third piece scanning mirror, rises in transmitting optical path
To the effect of continuous deflection light beam, play the role of continuously selecting visual field in receiving light path.
Further, the structure of the microlens array unit is so that the Kepler of field lens is added and looks in the distance structure as original
Type.
Further, the microlens array is square array, and receiving area is the inscribed circle of square array, emitter region
Domain is in remaining four corners.
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Present invention aim to provide a kind of near-infrared that transmitting-receiving bidirectional continuous scanning is carried out based on microlens array
Imaging optical system, the system have compact layout, and structure is simple, and scanning shift is small, and working field of view is big, and environmental suitability is strong etc.
Advantage.
As shown in Figure 1, a kind of near-infrared for carrying out transmitting-receiving bidirectional continuous scanning based on microlens array provided by the invention
Imaging optical system, which is characterized in that including for four tunnel emission systems of beam shaping, three-chip type microlens array, reception
Object lens and infrared detector；The emission system emits the light beam Jing Guo shaping, passes through three-chip type lenticule with 1.06 ° of field angles
Array becomes 0 °~10 ° scanning field of view angles and 1.06 ° of big visual-field beams for staring field angle；The light beam irradiates certain distance
Diffusing reflection then occurs for object, returns to microlens array with aforementioned scanning field of view angle and the light beam for staring field angle, process is micro-
The reception of lens becomes light beam identical with transmitting terminal field angle, then passes through and receives object lens focusing, object is imaged on spy
It surveys on device.
In case study on implementation of the present invention, microlens array is both launch window and receives window, therefore it is required that lenticule
Unit is bilateral, and crosstalk cannot occur for each unit, this just requires the entry port of microlens array unit and outgoing
The clear aperture of port is equal.
In case study on implementation of the present invention, microlens array looks in the distance structure as prototype so that the Kepler of field lens is added, and passes through battle array
Micro-displacement between column realizes light deflection or visual field selection.As shown in Figure 2.In receiving light path, 0 °~10 ° scanning field of view
Light beam is from left side incidence, and lenticule A convergent beam, lenticule B is field lens, and effect is to force down convergence at Polaroid face
The angle of beam primary light line.The focal length of lenticule A and lenticule B are all f1, lenticule C is subjected to displacement with respect to lenticule A, B, when
Microlens array will receive, when field angle is the beam collimation of ω, by geometric optical theory can obtain micro-displacement Δ=
f1tanω。
In case study on implementation of the present invention, for receiving light path, the entry port of microlens array unit and exit ports
Clear aperture is equal, and You Lahe invariant is apparent from, ideally, incident to stare field angle and to be emitted field angle equal.
But since microlens array only just realizes with three pieces that the Kepler of an addition field lens looks in the distance structure, there are it is biggish bear it is abnormal
Become, this, which just causes the incidence of microlens array to stare field angle and outgoing field angle, a small deviation.
In case study on implementation of the present invention, as shown in figure 3, microlens array is square array, lenticule unit thereon is
Having a size of micron-sized square, receiving aperture is the inscribed circle of square array, and transmitting aperture is distributed across the square array four
Circle in a corner.
In case study on implementation of the present invention, as shown in figure 4, in transmitting optical path, it is micro- with the light beam incidence of 1.06 ° of field angle
Lens array adjusts the displacement of lenticule C, stares the big visual-field beam of field angle from micro- with 10 ° of scanning field of view angles and 1.06 °
Lens array outgoing.
In case study on implementation of the present invention, as shown in figure 5, with above-mentioned scanning field of view angle and staring visual field in receiving light path
The light beam incidence microlens array at angle adjusts the displacement of lenticule C, and light beam is with angle identical with transmitting terminal field angle from micro-
Lens array outgoing.
In case study on implementation of the present invention, detector pixel is having a size of micron-sized size.In receiving light path, through lenticule
For the light beam of array received after after object lens focal imaging, each root mean square size for staring visual field of each scanning field of view is small
In the size of detector single pixel.
The near infrared imaging optical system provided by the invention that transmitting-receiving bidirectional continuous scanning is carried out based on microlens array, is led to
The relative displacement between microlens array is crossed, realizes light beam deflection (transmitting) and visual field selection (reception).The system layout is compact, knot
Structure is simple, and the displacement stroke of microlens array is smaller, for solving the contradiction between the big visual field of optical system and high-resolution, mentions
High Performance of Optical System has certain meaning.
Claims (6)
1. one kind is based on microlens array transmitting-receiving bidirectional continuous scanning near infrared imaging system, characterized in that including being used for light beam
Four tunnel emission systems of shaping, receive object lens and infrared detector at three-chip type microlens array；The emission system transmitting is passed through
The light beam of shaping passes through three-chip type microlens array with 1.06 ° of field angles, becomes 0 °~10 ° scanning field of view angles and sets solidifying
Depending on the big visual-field beam of field angle；The light beam irradiates the object of certain distance, diffusing reflection occurs, then with aforementioned scanning field of view
Angle and the light beam for staring field angle return to microlens array and become identical with transmitting terminal field angle by the reception of lenticule
Light beam then passes through and receives object lens focusing, on the detector by object imaging.
2. being based on microlens array transmitting-receiving bidirectional continuous scanning near infrared imaging system as described in claim 1, characterized in that
The entry port of the microlens array unit and the clear aperture of exit ports are equal.
3. being based on microlens array transmitting-receiving bidirectional continuous scanning near infrared imaging system as described in claim 1, characterized in that
Further, the microlens array passes through the micro-displacement of its third piece scanning mirror, plays in transmitting optical path continuous inclined
The effect for turning light beam is played the role of continuously selecting visual field in receiving light path.
4. being based on microlens array transmitting-receiving bidirectional continuous scanning near infrared imaging system as described in claim 1, characterized in that
Further, the structure of the microlens array unit is to look in the distance structure as prototype so that the Kepler of field lens is added.
5. being based on microlens array transmitting-receiving bidirectional continuous scanning near infrared imaging system as described in claim 1, characterized in that
Further, the microlens array is square array, and receiving area is the inscribed circle of square array, and emitting area is in residue
Four corners in.
6. being based on microlens array transmitting-receiving bidirectional continuous scanning near infrared imaging system as described in claim 1, characterized in that
Further specifically, microlens array includes lenticule A, B, C, in receiving light path, the light beams of 0 °~10 ° scanning field of view from
The left side is incident, and lenticule A convergent beam, lenticule B is field lens, and effect is to force down convergent beam master at Polaroid face
The angle of light；The focal length of lenticule A and lenticule B are all f1, lenticule C is subjected to displacement with respect to lenticule A, B, works as lenticule
Array when field angle is the beam collimation of ω, obtains micro-displacement Δ=f by geometric optical theory for what is received1tanω。
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Cited By (5)
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| CN110308553A (en) * | 2019-07-29 | 2019-10-08 | 天津大学 | The middle infrared imaging optical system of visual field switching is carried out based on microlens array |
| CN110333600A (en) * | 2019-06-24 | 2019-10-15 | 哈尔滨新光光电科技股份有限公司 | A kind of big field optical imaging device and its control method based on compound eye lens group |
| CN111338078A (en) * | 2020-04-16 | 2020-06-26 | 北京空间机电研究所 | Few-pixel optical imaging system |
| CN112987018A (en) * | 2021-02-08 | 2021-06-18 | 中国科学院光电技术研究所 | Laser imaging optical system for realizing large-gaze field detection by using planar micro-nano structure lens |
| CN113777776A (en) * | 2021-09-10 | 2021-12-10 | 中国科学院光电技术研究所 | Large-field-of-view laser beam scanning system, design method thereof and laser radar device |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110333600A (en) * | 2019-06-24 | 2019-10-15 | 哈尔滨新光光电科技股份有限公司 | A kind of big field optical imaging device and its control method based on compound eye lens group |
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| CN111338078A (en) * | 2020-04-16 | 2020-06-26 | 北京空间机电研究所 | Few-pixel optical imaging system |
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| CN112987018A (en) * | 2021-02-08 | 2021-06-18 | 中国科学院光电技术研究所 | Laser imaging optical system for realizing large-gaze field detection by using planar micro-nano structure lens |
| CN113777776A (en) * | 2021-09-10 | 2021-12-10 | 中国科学院光电技术研究所 | Large-field-of-view laser beam scanning system, design method thereof and laser radar device |
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Application publication date: 20190503 |