CN216012481U - Compact three-band full-polarization imaging universal device - Google Patents
Compact three-band full-polarization imaging universal device Download PDFInfo
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- CN216012481U CN216012481U CN202121583638.4U CN202121583638U CN216012481U CN 216012481 U CN216012481 U CN 216012481U CN 202121583638 U CN202121583638 U CN 202121583638U CN 216012481 U CN216012481 U CN 216012481U
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Abstract
The utility model discloses a compact three-band full-polarization imaging universal device, which comprises a universal interface module, a full-polarization imaging module, an optical element adjusting frame and a shading cover, wherein the universal interface module is connected with a bayonet of an external lens; the full-polarization imaging module comprises a movable three-band filter insert and a rotatable embedded mounting seat, and a polarization element is mounted in the embedded mounting seat; one side of the optical element adjusting frame is integrally formed with the universal interface module, the other side of the optical element adjusting frame is connected with the CCD detector joint, and a placement groove for placing the full-polarization imaging module is formed in the surface of the optical element adjusting frame; the shading cover comprises an internal shading cover and an external shading cover, the internal shading cover is connected with and covers the position of the placement groove of the optical element adjusting frame, and the external shading cover is sleeved outside the internal shading cover and the optical element adjusting frame. The utility model has compact optical structure, various imaging modes, convenient operation and low cost.
Description
Technical Field
The utility model relates to a compact three-band full-polarization imaging universal device, and belongs to the technical field of polarization imaging detection.
Background
The polarization imaging is mainly divided into time-sharing polarization imaging and simultaneous polarization imaging. The time-sharing polarization imaging is to obtain polarization diagrams of different angles by rotating the polarization element or to change the polarization characteristic imaging of the polarization element by the modulation device, and has the advantages of simple optical structure, low cost and incapability of processing a moving target. Meanwhile, polarization imaging adopts a plurality of groups of polarization measurement units to obtain the polarization characteristics of the same target in a spatial combination mode, and has the advantages that transient polarization information of the target at a specific moment can be synchronously obtained, and polarization detection can be carried out on a moving target.
The time-sharing polarization imaging is widely applied to accurate full-polarization information acquisition of static targets and various teaching experiment activities. At present, most time-sharing polarization imaging devices are single in imaging mode, few in polarization information acquisition, complex in structure and high in price. In a time-sharing imaging device proposed in recent years, patent No. CN201910742402.1, which is proposed by the environmental characteristics research institute of beijing, "time-sharing infrared polarization imaging device and method for dynamic object measurement", only a polarizer is arranged in an analyzer assembly between a lens and an infrared focal plane detector, that is, only linear polarization information can be obtained, and the analyzer assembly occupies a large volume, which is not favorable for obtaining portable polarization information in multiple scenes. An optical imaging detection device based on polarization time-sharing spectrum synchronization, which is proposed by the precision mechanical research institute of optics in west' ann in 2020, is published under the reference CN111750997A, and adopts a spectrum modulation component configured by a plurality of optical filters with different wave bands in an mxn matrix form to acquire linear polarization information under different wave bands, so that the structure is complex and the price is high.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects in the prior art and provides a compact three-band full-polarization universal device which is mainly used for static scene three-band full-polarization imaging, and has the advantages of compact optical structure, various imaging modes, convenience in operation and low cost.
In order to achieve the purpose, the utility model is realized by adopting the following technical scheme:
a compact three-band full-polarization imaging universal device comprises a universal interface module, a full-polarization imaging module, an optical element adjusting frame and a shading cover,
the universal interface module is used for being connected with a bayonet of an external lens;
the full-polarization imaging module comprises a movable three-band filter insert and a rotatable embedded mounting seat, and a polarization element is mounted in the embedded mounting seat;
one side of the optical element adjusting frame is integrally formed with the universal interface module, the other side of the optical element adjusting frame is connected with the CCD detector joint, and a placement groove for placing the full-polarization imaging module is formed in the surface of the optical element adjusting frame;
the shading cover comprises an internal shading cover and an external shading cover, the internal shading cover is connected with and covers the position of the placement groove of the optical element adjusting frame, and the external shading cover is sleeved outside the internal shading cover and the optical element adjusting frame.
Preferably, the universal interface module is provided with a limiting rod and a plurality of screw holes, and different screw holes are assisted by the limiting rod, so that bayonets of different lenses can be connected.
Preferably, be equipped with 3 round holes on the three wave band filter cutting, every round hole is equipped with the fixed bayonet socket of filter, adopts the screw to screw, conveniently changes the filter, changes current working wave band through removing the cutting. The gating of wave bands with the central wavelength and the bandwidth of 450 +/-10 nm, 550 +/-10 nm, 633 +/-10 nm and the like can be realized.
Preferably, the embedded installation seats can be provided with two embedded 1/4 wave plates and linear polarizers respectively, and information such as linear polarization, circular polarization, total polarization and the like can be obtained by adjusting the angle combination of the linear polarizers and the 1/4 wave plates. Such as: the 1/4 wave plate is taken out, and linear polarization information can be obtained only when the linear polarizer works; when the 1/4 wave plate is put in, the angle is kept unchanged, and the angle of the linear polarizer is adjusted to obtain circular polarization information; the circular polarization information can be obtained by adjusting 1/4 wave plate while keeping the angle of the polarizer unchanged. Further preferably, two ends of the embedded mounting seat are provided with small brackets. 360 degree rotation of the 1/4 wave plate and linear polarizer can be achieved by a small bracket, which also facilitates removal from the device.
Preferably, the optical element adjusting frame comprises a clamping groove for placing the three-band filter insert and an arc-shaped groove for placing the embedded mounting seat, the embedded mounting seat is in key connection with the arc-shaped groove, the three-band filter insert can be moved in the clamping groove in a spot check mode, and the embedded mounting seat can rotate.
Preferably, the built-in shading cover is provided with a placement groove correspondingly matched with the optical element adjusting frame, the built-in shading cover and the placement groove of the optical element adjusting frame are oppositely arranged, and the built-in shading cover and the placement groove of the optical element adjusting frame are assembled and connected through a flat key and a flat key groove. The external shading cover is connected with the internal shading cover and the optical element adjusting frame through threads, and light leakage of an interface connected with a flat key is processed. The use of a double light-shielding cover ensures the light-shielding properties of the device.
Preferably, jacks are arranged on two sides of the external shading cover and used for inserting the three-band filter inserting strips.
Preferably, the CCD detector joint is an external thread joint and is connected with the CCD detector through threads, and the assembly is convenient.
Compared with the prior art, the utility model has the following beneficial effects:
(1) the device of the utility model assembles the front collimating lens, the three-band filter insert, the polarization element and the mounting seat on the optical element adjusting frame, and has compact layout, convenient assembly and low cost. The device can be used for multi-angle combination of polarizing elements such as a filter plate, an 1/4 wave plate and a linear polarizer, and has important use value in the aspects of measurement of multiband total polarization parameters, extraction of polarization information such as linear polarization, circular polarization, total polarization and the like.
(2) The full-polarization imaging module in the device comprises three parts, namely a three-band filter insert, an 1/4 wave plate and a polaroid, and the current working band of the device is changed by changing the position of the three-band filter insert, so that the measurement of multiband full-polarization parameters can be realized. 1/4 different combinations of wave plate and linear polarizer and angle adjustment can extract polarization information such as linear polarization, circular polarization and the like, and the adjustment and assembly are convenient.
(3) The device of the utility model has compact structure, compact layout and small occupied volume, can achieve the total length less than 30mm and the total width less than 100mm, and makes the realization of the portable polarization imaging device possible.
(4) The device of the utility model designs the polarizing device between the target surface of the CCD detector and the universal lens, which is beneficial to reducing the size of the optical element, greatly saves the cost compared with most devices which arrange the polarizing device in front of the lens, and provides possibility for realizing low-cost portable full-polarization imaging.
Drawings
Fig. 1 is a schematic assembly structure diagram of a compact three-band full-polarization imaging general device provided in embodiment 1 of the present invention.
Fig. 2 is a schematic structural diagram of the universal interface module described in embodiment 1.
Fig. 3 is a schematic structural diagram of the recessed mount described in embodiment 1.
Fig. 4 is a schematic structural diagram of an optical element adjustment frame according to embodiment 1.
Fig. 5 is a schematic structural view of the built-in light shielding cover according to embodiment 1.
Fig. 6 is a schematic structural view of the external light shielding cover according to embodiment 1.
Fig. 7 is a schematic diagram of three-band full-polarization imaging according to embodiment 2.
In the figure: 1-universal interface module, 11-limiting rod, 12-screw hole; 2-full polarization imaging module, 21-three-band filter insert, 22-embedded mounting seat and 221-small support; 3-optical element adjusting frame, 31-clamping groove, 32-arc groove and 33-CCD detector joint; 4-shading cover, 41-internal shading cover, 42-external shading cover and 421-jack.
Detailed Description
The utility model is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
Example 1
The compact three-band full-polarization imaging universal device shown in fig. 1 comprises a universal interface module 1, a full-polarization imaging module 2, an optical element adjusting frame 3 and a shading cover 4, wherein the universal interface module 1 is used for being connected with a bayonet of an external lens; the full-polarization imaging module 2 comprises a movable three-band filter insert 21 and a rotatable embedded mounting seat 22, and a polarization element is mounted in the embedded mounting seat 22; one end of the optical element adjusting frame 3 is integrally formed with the universal interface module 1, the other end of the optical element adjusting frame is connected with the CCD detector connector 33, the CCD detector connector 33 is an external thread connector and is connected with the CCD detector through threads, and a containing groove for containing the full-polarization imaging module 2 is formed in the surface of the optical element adjusting frame 3; the shading cover 4 comprises an internal shading cover 41 and an external shading cover 42, the internal shading cover 41 is connected with and covers the position of the placement groove of the optical element adjusting frame 3, and the external shading cover 42 is sleeved outside the internal shading cover 41 and the optical element adjusting frame 3.
As shown in fig. 2, the universal interface module 1 of this embodiment is provided with a limiting rod 11 and a plurality of screw holes 12, and the limiting rod 11 assists different screw holes 12 to connect with bayonets of different lenses, so as to connect with the lenses. In the embodiment, the three screw holes 12 below the limit rod 11 are connected with the three-hinged ring bayonet, so that the F bayonet of Nikon can be connected.
This embodiment be equipped with 3 round holes on the three wave band filter cutting 11, every round hole is equipped with the fixed bayonet socket of filter, adopts the screw to screw, conveniently changes the filter, changes current operating band through removing the cutting, can realize that central wavelength and bandwidth are 450 + -10 nm respectively, 550 + -10 nm, band gating such as 633 + -10 nm.
The embedded installation base 22 shown in fig. 3 is provided with two embedded 1/4 wave plates and linear polarizers respectively, two ends of the embedded installation base 22 are provided with small brackets, 360-degree rotation of the 1/4 wave plate and the linear polarizer can be realized through the small brackets, the embedded installation base can be conveniently taken out of the device, and information such as linear polarization, circular polarization, total polarization and the like can be obtained by adjusting the angle combination of the linear polarizer and the 1/4 wave plate. Such as: the 1/4 wave plate is taken out, and linear polarization information can be obtained only when the linear polarizer works; when the 1/4 wave plate is put in, the angle is kept unchanged, and the angle of the linear polarizer is adjusted to obtain circular polarization information; the circular polarization information can be obtained by adjusting 1/4 wave plate while keeping the angle of the polarizer unchanged.
As shown in fig. 4, in this embodiment, the optical element adjusting frame 3 includes a slot 31 for placing the three-band filter strip 21 and an arc-shaped groove 32 for placing the embedded mounting seat 22, the three-band filter strip 21 can be selectively checked and moved in the slot, and the embedded mounting seat 22 and the arc-shaped groove 32 are connected by a key, so that the embedded mounting seat 22 can rotate.
As shown in fig. 5, the built-in light shielding cover 41 of the present embodiment is provided with a corresponding mounting groove matching with the optical element adjusting frame 3, and the built-in light shielding cover 41 and the mounting groove of the optical element adjusting frame 3 are oppositely arranged and are assembled and connected by a flat key and a flat key groove. The internal shading cover 41 and the outer surface of the optical element adjusting frame 3 are both provided with threads, and the threads are connected into a whole after assembly. The external light-shielding cover 42 shown in fig. 6 is connected to the internal light-shielding cover 41 and the optical element adjusting frame 3 by screws, and light leakage at the interface of the flat key connection is handled. The use of a double light-shielding cover ensures the light-shielding properties of the device. Two sides of the external light-shielding cover 42 are provided with insertion holes 421 for inserting the three-band filter insertion strip 21.
Example 2
In this embodiment, the compact three-band full-polarization imaging general apparatus described in embodiment 1 is used to perform a visible light three-band full-polarization imaging experiment, and the three-band full-polarization imaging principle is shown in fig. 7.
As shown in fig. 7, in the present embodiment, an external scene enters the apparatus through a lens, and passes through the three-band filter insert 11, the 1/4 wave plate, and the linear polarizer in this order in the apparatus. Light with three wave bands of 450 +/-10 nm, 550 +/-10 nm and 633 +/-10 nm can be gated into the device through the three-wave-band filter insert 11. The light with specific wavelength is gated by the filter plate and passes through the 1/4 wave plate and the linear polarizer in a multi-angle combination mode to obtain corresponding polarization states, the corresponding polarization states pass through the CCD detector to form images of the polarization states, the CCD detector is connected with the computer, and the polarization images formed by the CCD detector are transmitted to the computer through data lines.
1/4A multi-angle combination of a wave plate and a linear polarizer comprising: keeping 1/4 wave plate direction unchanged, respectively rotating the linear polarizer to form 0 degree, 45 degree and 90 degree with X axis to the polarization intensity diagrams I (0 degree ), I (45 degree, 0 degree) and I (90 degree, 0 degree); keeping the linear polarization and the X axis at 0 degrees, rotating 1/4 wave plate and the X axis at 45 degrees to obtain a polarization intensity diagram I (45 degrees and 90 degrees);
the four obtained polarization intensity images can be respectively obtained into full polarization information such as linear polarization, elliptical polarization, circular polarization and the like through calculation of a correlation formula.
Different visible light wave bands are gated by moving the filter plate inserting strip, and then visible light three-wave band full-polarization imaging is obtained.
The main components used in the experiment described in this example are described below:
(1)1/4 wave plate adopts achromatic 1/4 wave plate of THORLAB company, model AQWP10M-600, working wave band 400 nm-700 nm, phase delay accuracy lambda/40-lambda/120, diameter phi 22.6 mm.
(2) The linear polarizer adopts a composite film linear polarizer of THORLAB company, model LPVISE100-A, anti-reflection wave band 400 nm-760 nm, extinction ratio: 1000:1, diameter phi 25.4 mm.
(3) The filter adopts a dielectric film filter manufactured by THORLAB company, the diameter phi of the filter is 25.4mm, the central wavelength and the bandwidth are respectively 450 +/-10 nm, 550 +/-10 nm and 633 +/-10 nm, and the filter is arranged on a filter insert.
(4) The lens is a 50mm focal length, standard F-port lens from Nikon corporation.
(5) The CCD detector adopts a PCO.edge4.2 CCD camera of PCO company, the camera adopts a backside metalized scientific CMOS (bisCMOS) chip, the pixel size is 6.5um multiplied by 6.5um, the resolution is 2048 multiplied by 2048, the corresponding range of the pixel size spectrum is 370 nm-1100 nm, the refrigeration temperature is minus 25 ℃ to 25 ℃, the exposure time is 10us-20s, the power supply connector is 24VDC +/-10%, the USB3.1 interface is adopted for data transmission, and the transmission and power supply of a portable notebook computer can be supported.
The specific steps of the experiment described in this example are as follows:
step 1: supplying power to the CCD detector, and connecting the CCD detector with a computer;
step 2: the optical element adjusting frame 3 is connected with the CCD detector backwards and connected with the lens forwards;
and step 3: assembling the tri-band filter insert 21, the embedded mounting seat 22 in the optical element adjusting frame 3, and covering the internal shading cover 41 and the external shading cover 42;
and 4, step 4: adjusting the focal length of the lens;
and 5: moving the three-band filter cutting 21 to gate the current working band;
step 6: set angle
Respectively showing included angles between the light transmission direction of the polaroid and the x axis and between the light transmission direction of the polaroid and the fast axis of the 1/4 wave plate; the wave plate 1/4 is rotated and the linear polarizer,
making the light transmission directions of the 1/4 wave plate fast axis and the linear polarizer consistent, and making an included angle of 0 degree with the x axis to obtain an intensity graph I (0 degree );
intensity pattern I (90 °,0 °) with 90 ° included angle with x-axis, with 1/4 wave plate fast axis and linear polarizer transmission direction being identical;
intensity pattern I (45 °,0 °) with an included angle of 45 ° with the x-axis, with the light transmission directions of the 1/4 wave plate fast axis and linear polarizer being the same;
an included angle between the fast axis of the 1/4 wave plate and the direction of the x axis is 45 degrees, and an included angle between the polarization direction of the linear polarizer and the x axis is 0 degree, namely an intensity diagram I (45 degrees, pi/2);
the four images obtained above are respectively subjected to non-uniform correction and image registration, errors caused by image offset are eliminated, the corrected images can be calculated to obtain a linear polarization image, a circular polarization image, a polarization angle image, an elliptical polarization angle image and the like of the current waveband, and the calculation method comprises the following steps:
I＝I(0°,0°)+I(90°,0°)
Q＝I(0°,0°)-I(90°,0°)
U＝2I(45°,0°)-[I(0°,0°)+I(90°,0°)]
V＝2I(45°,π/2)-[I(0°,0°)+I(90°,0°)]
linear polarization degree image:
circular polarization degree image:
polarization angle image:
ellipsometric angle image:
in the above formula: i is the total intensity of the light, Q is the intensity difference between horizontal and vertical polarization, U represents the intensity difference between +45 degrees and-45 degrees for the linearly polarized portion of the light, and V represents the intensity difference for the left and right circularly polarized components of the light; DOLP is linear polarization degree, DOCP is circular polarization degree, AOP is polarization angle, AOE is elliptical polarization angle;
and 7: and (5) moving the three-band filter insert 21 to change the current working band, and repeating the step (6) to obtain full-polarization images under different bands.
Through the experiment, the compact three-band full-polarization imaging universal device is combined with the lens and the CCD detector to acquire full-polarization information under different bands.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A compact three-band full-polarization imaging universal device is characterized by comprising a universal interface module, a full-polarization imaging module, an optical element adjusting frame and a shading cover,
the universal interface module is used for being connected with a bayonet of an external lens;
the full-polarization imaging module comprises a movable three-band filter insert and a rotatable embedded mounting seat, and a polarization element is mounted in the embedded mounting seat;
one side of the optical element adjusting frame is integrally formed with the universal interface module, the other side of the optical element adjusting frame is connected with the CCD detector joint, and a placement groove for placing the full-polarization imaging module is formed in the surface of the optical element adjusting frame;
the shading cover comprises an internal shading cover and an external shading cover, the internal shading cover is connected with and covers the position of the placement groove of the optical element adjusting frame, and the external shading cover is sleeved outside the internal shading cover and the optical element adjusting frame.
2. The compact three-band full-polarization imaging universal device according to claim 1, wherein a limiting rod and a plurality of screw holes are arranged on the universal interface module.
3. The compact universal device for three-band full-polarization imaging according to claim 1, wherein the three-band filter insert is provided with 3 circular holes, each circular hole being provided with a filter fixing bayonet.
4. The compact three-band full-polarization imaging generic device according to claim 1, wherein the embedded mounts are provided with two, respectively embedded 1/4 wave plates and linear polarizers.
5. The compact three-band full-polarization imaging universal device according to claim 1, wherein small brackets are provided at both ends of the embedded mounting base.
6. The compact three-band full-polarization imaging universal device according to claim 1, wherein the optical element adjusting frame comprises a clamping groove for placing the three-band filter insert and an arc-shaped groove for placing the embedded mounting seat, and the embedded mounting seat is connected with the arc-shaped groove by a semicircular key.
7. The compact three-band full-polarization imaging universal device according to claim 1, wherein the built-in shading cover is provided with a corresponding matching placement groove on the optical element adjusting frame, and the built-in shading cover and the placement groove of the optical element adjusting frame are oppositely arranged and are assembled and connected through a flat key and a flat key groove.
8. The compact three-band full-polarization imaging universal device according to claim 7, wherein the internal light shielding cover and the optical element adjusting bracket are provided with threads on the outer surfaces thereof, the threads are integrally connected after assembly, and the external light shielding cover is connected with the internal light shielding cover and the optical element adjusting bracket through the threads.
9. The compact universal device for three-band full-polarization imaging according to claim 1, wherein the external shading cover is provided with insertion holes at two sides for inserting the three-band filter inserts.
10. The compact three-band full-polarization imaging universal device according to claim 1, wherein the CCD detector connector is an external thread connector and is connected with the CCD detector through threads.
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| CN115061254A (en) * | 2022-07-20 | 2022-09-16 | 北京易兴元石化科技有限公司 | Filter plate carrying device for positioning interference zero-optical-path-difference position |
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| CN115061254A (en) * | 2022-07-20 | 2022-09-16 | 北京易兴元石化科技有限公司 | Filter plate carrying device for positioning interference zero-optical-path-difference position |
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