CN213182178U - Wedge plate type beam splitter for visible-infrared light synchronous imaging system - Google Patents
Wedge plate type beam splitter for visible-infrared light synchronous imaging system Download PDFInfo
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- CN213182178U CN213182178U CN202022566126.9U CN202022566126U CN213182178U CN 213182178 U CN213182178 U CN 213182178U CN 202022566126 U CN202022566126 U CN 202022566126U CN 213182178 U CN213182178 U CN 213182178U
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Abstract
The utility model discloses a wedge plate type beam splitter for synchronous imaging system of visible-infrared light, including visible light formation of image light path and infrared light formation of image light path, visible light formation of image light path is primary mirror, secondary mirror, wedge plate type beam splitter, visible light mirror group, visible light CCD image sensor along light beam propagation path in proper order, and infrared light formation of image light path is primary mirror, secondary mirror, wedge plate type beam splitter, infrared lens group, infrared CCD image sensor along light beam propagation path in proper order. The system can perform spectral separation on the light waves with ultra-wide wave bands, so that visible light and infrared light are imaged in different wave spectrum bands, the volume of the system is reduced, and the subsequent measurement work is facilitated; compared with other existing optical system designs, the beam splitter adopts a wedge-shaped design, and a specially optimized wedge angle can play a role in correcting infrared band off-axis aberration and can also inhibit ghost images.
Description
Technical Field
The utility model belongs to the technical field of optical imaging, concretely relates to wedge plate type beam splitter for visible-infrared light synchronous imaging system.
Background
For some fields needing visible light and infrared light to image once, a method of collecting or imaging for multiple times by a lens is generally adopted in the market, so that the complexity of a collecting system is increased, and in the existing scheme, a parallel flat plate is adopted by a beam splitter, so that the generation of reflected visible light ghost images cannot be well inhibited, and off-axis aberration cannot be corrected, so that the image quality observed on an image plane is not clear, and the problem of imaging quality reduction occurs. The utility model discloses wedge plate type beam splitter for synchronous imaging system of visible-infrared light has been proposed to above-mentioned problem, the wedge angle of wedge plate type beam splitter designs through the geometry optics principle, can realize rectifying the function of the off-axis aberration of infrared band, two surfaces of wedge plate carry out the design of membrane system through the Fresnel principle, plated the anti-reflection coating to visible light reflection's high reflection coating and to infrared band increase transmissivity respectively, carry out spectral separation to the light wave of super wide band (wavelength 400 sand 16000nm), make reflection light and transmission light image at different spectrum sections respectively.
SUMMERY OF THE UTILITY MODEL
In order to solve the aberration and ghost image problems existing in the visible-infrared synchronous imaging system, the utility model provides a wedge plate type beam splitter for the visible-infrared synchronous imaging system, the system can realize correcting infrared band off-axis aberration and carry out spectral separation's function to the light wave of super wide band (wavelength 400-.
In order to solve the technical problem, the utility model discloses a following technical scheme:
a wedge plate type beam splitter for a visible-infrared synchronous imaging system comprises a primary mirror, a secondary mirror, a wedge plate type beam splitter, a visible light mirror group, a visible light CCD image sensor, an infrared lens group and an infrared CCD image sensor, wherein a light beam passes through the wedge plate type beam splitter to form a visible light imaging light path and an infrared light imaging light path, the visible light imaging light path sequentially comprises the primary mirror, the secondary mirror, the wedge plate type beam splitter, the visible light mirror group and the visible light CCD image sensor along a light beam propagation path, and the infrared light imaging light path sequentially comprises the primary mirror, the secondary mirror, the wedge plate type beam splitter, the infrared lens group and the infrared CCD image sensor along the light beam propagation path.
Further, the visible light imaging optical path: the parallel light is reflected by the primary mirror, converged by the secondary mirror, reflected again and transmitted to the wedge plate type beam splitter, and the light transmitted to the wedge plate type beam splitter is reflected to form a first light beam, transmitted to the visible light lens group and subjected to visible light band imaging on the visible light CCD image sensor.
Further, the infrared light imaging optical path: the light transmitted to the wedge plate type beam splitter forms a second light beam through transmission, the second light beam is transmitted to the infrared lens group, and the infrared band imaging is carried out on the infrared CCD image sensor.
Further, the wedge type beam splitter is a plate-shaped optical element having a wedge angle for correcting an off-axis aberration of an infrared band.
Further, the wedge angle and the inclination angle of the wedge plate type beam splitter are obtained in advance through simulation experiments.
Furthermore, the front surface of the wedge plate type beam splitter is plated with a beam splitting film which is highly reflective to visible light and anti-reflective to infrared light, and the back surface of the wedge plate type beam splitter is plated with an infrared waveband anti-reflective film which is anti-reflective to infrared light.
Compared with the prior art, the utility model, showing the advantage and being:
the system can perform spectral separation on the light waves with ultra-wide wave bands, so that visible light and infrared light are imaged in different wave spectrum bands, the volume of the system is reduced, and the subsequent measurement work is facilitated; compared with other existing optical system designs, the beam splitter adopts a wedge-shaped design, and a specially optimized wedge angle can play a role in correcting infrared band off-axis aberration and can also inhibit ghost images.
Drawings
FIG. 1 is a schematic diagram of a visible-infrared light synchronous imaging system
Fig. 2 is a schematic diagram of a visible light imaging optical path.
Fig. 3 is a schematic diagram of an infrared light imaging optical path.
Figure 4 is a beam splitter using a wedge design.
In the figure: 1. a primary mirror; 2. a secondary mirror; 3. a wedge-shaped beam splitter; 4. a visible light imaging lens group; 5. a visible waveband CCD image sensor; 6. an infrared light imaging lens group; 7. infrared band CCD image sensor.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the present embodiment provides a wedge-shaped beam splitter for a visible-infrared synchronous imaging system, and an optical system applied to the wedge-shaped beam splitter includes an R-C system composed of a primary mirror 1 and a secondary mirror 2, a wedge-shaped beam splitter 3, a visible light imaging lens group 4, a visible band CCD image sensor 5, an infrared light imaging lens group 6, and an infrared band CCD image sensor 7.
As shown in fig. 2, the visible light imaging optical path is as follows: one beam of parallel light is reflected by the R-C system primary mirror 1, then converged to the secondary mirror 2, reflected again and then transmitted to the wedge plate type beam splitter 3; the light transmitted to the wedge plate type beam splitter 3 is reflected to form a first light beam, the first light beam is transmitted to the visible light mirror group 4, and visible light wave band imaging is carried out on the visible light CCD image sensor 5.
As shown in fig. 3, the infrared imaging optical path: one beam of parallel light is transmitted to the wedge plate type beam splitter 3 after being reflected by the two reflection systems, and is transmitted to form a second light beam which is transmitted to the infrared lens group 6 and is imaged on the infrared CCD image sensor 7 in an infrared band.
Fig. 4 is a schematic structural diagram of the beam splitter 3. The wedge type beam splitter is a flat plate beam splitter with a specific wedge angle, and the wedge angle is used for correcting infrared band off-axis aberration. The wedge angle of the wedge-shaped beam splitter is designed according to the geometrical optics principle, the function of correcting infrared band off-axis aberration can be achieved, the two surfaces of the wedge plate are designed according to the Fresnel principle, the beam splitting film is plated on the first surface, the high reflection effect on visible light and the anti-reflection effect on infrared light are achieved, and meanwhile the anti-reflection film on the second surface is plated on the second surface, so that the anti-reflection effect on infrared light can be achieved. Meanwhile, the optical spectrum separation of the light wave with the ultra-wide wave band (the wavelength is 400-16000nm) and the correction function of the off-axis aberration of the infrared wave band are realized.
The wedge plate beam splitter is specifically designed: the wedge angle and the inclination angle of the wedge plate type beam splitter are optimized in optical design software such as ZEMAX, coordinate break points are arranged behind the first surface and the second surface of the wedge plate, the value of the radius of the diffuse spot is used as an evaluation standard, after optimization operation is carried out, an inclination X parameter a and an inclination Y parameter b at the first coordinate break point, an inclination X parameter c and an inclination Y parameter d after the second coordinate break point, an eccentricity X parameter e and an eccentricity Y parameter f can be obtained, and at the moment, the wedge beam splitter is optimized and finished. In the actual assembly process, various parameters and optimization of the wedge-shaped plate are realized by parameter control in the machining process, after machining is completed, various optical parameters of the wedge-shaped plate are determined, and various indexes preset by the system are realized after the components such as the visible light lens group, the infrared imaging lens group and the like behind the wedge-shaped beam splitter are adjusted. The visible-infrared synchronous imaging system of the wedge-shaped beam splitter which reaches the design standard can correct the off-axis aberration of the infrared waveband and can perform spectral separation on the ultra-wide optical waveband, thereby imaging the visible light and the infrared light in different spectral bands.
To sum up, the wedge-shaped beam splitter for the visible-infrared synchronous imaging system of the present invention is a flat beam splitter with a specific wedge angle, wherein both sides of the wedge-shaped beam splitter are respectively coated with a high reflective film and an anti-reflection film to perform spectral separation on the light wave of the ultra-wide spectrum band according to visible light and infrared light, the visible light band is reflected by the wedge-shaped beam splitter, and the reflected light is imaged through the visible light lens group; the infrared light wave band is transmitted by the wedge-shaped beam splitter, and the transmitted light is imaged by the infrared lens group; the beam splitter adopts a wedge-shaped design, and the off-axis aberration of the infrared band can be corrected by optimally designing the wedge angle of the beam splitting plate.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention. Those skilled in the art will appreciate that the details of the present invention not described in detail herein are well within the skill of those skilled in the art. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The utility model provides a wedge plate type beam splitter for synchronous imaging system of visible-infrared light, its characterized in that, includes primary mirror (1), secondary mirror (2), wedge plate type beam splitter (3), visible light mirror group (4), visible light CCD image sensor (5), infrared lens group (6), infrared CCD image sensor (7), and the light beam warp wedge plate type beam splitter forms visible light imaging optical path and infrared light imaging optical path, and visible light imaging optical path is primary mirror (1), secondary mirror (2), wedge plate type beam splitter (3), visible light mirror group (4), visible light CCD image sensor (5) along light beam propagation path in proper order, and infrared light imaging optical path is primary mirror (1), secondary mirror (2), wedge plate type beam splitter (3), infrared lens group (6), infrared CCD image sensor (7) along light beam propagation path in proper order.
2. The wedge plate type beam splitter for a visible-infrared synchronous imaging system according to claim 1, wherein the visible light imaging optical path is: the parallel light is reflected by the primary mirror (1), converged by the secondary mirror (2), reflected again and transmitted to the wedge plate type beam splitter (3), and reflected to form a first light beam, transmitted to the visible light lens group (4) and imaged on a visible light CCD (charge coupled device) image sensor (5) in a visible light waveband.
3. The wedge plate type beam splitter for a visible-infrared synchronous imaging system according to claim 1, wherein the infrared light imaging optical path is: the light transmitted to the wedge plate type beam splitter (3) forms a second light beam through transmission, transmits to the infrared lens group (6) and carries out infrared band imaging on the infrared CCD image sensor (7).
4. A wedge plate type beam splitter for a synchronous visible-infrared imaging system according to claim 1, wherein the wedge plate type beam splitter (3) is a plate-shaped optical element having a wedge angle for correcting infrared band off-axis aberrations.
5. The wedge type beam splitter for a visible-infrared light synchronous imaging system according to claim 4, wherein the wedge angle and the inclination angle of the wedge type beam splitter (3) are obtained by simulation experiment in advance.
6. The wedge-plate type beam splitter for the visible-infrared synchronous imaging system according to claim 1 or 4, wherein the front surface of the wedge-plate type beam splitter (3) is coated with a beam splitting film with high visible light reflection and infrared light reflection increasing performance, and the back surface is coated with an infrared band reflection increasing film with infrared light reflection increasing performance.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022566126.9U CN213182178U (en) | 2020-11-09 | 2020-11-09 | Wedge plate type beam splitter for visible-infrared light synchronous imaging system |
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| CN202022566126.9U CN213182178U (en) | 2020-11-09 | 2020-11-09 | Wedge plate type beam splitter for visible-infrared light synchronous imaging system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117109735A (en) * | 2023-10-25 | 2023-11-24 | 中国科学院合肥物质科学研究院 | Hemispherical space moon shimmer irradiance instrument optical system and design method |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117109735A (en) * | 2023-10-25 | 2023-11-24 | 中国科学院合肥物质科学研究院 | Hemispherical space moon shimmer irradiance instrument optical system and design method |
| CN117109735B (en) * | 2023-10-25 | 2024-01-30 | 中国科学院合肥物质科学研究院 | Hemispherical space moon shimmer irradiance instrument optical system and design method |
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