Three-wavelength full-polarization detection device capable of being assembled

Abstract

The utility model discloses a three-wavelength full-polarization detection device capable of being assembled. The three-wavelength full-polarization detection device comprises a 1 / 4 wave plate module and a linear polarizer module, the 1 / 4 wave plate module comprises a wave plate rotating frame, a 1 / 4 wave plate, a wave plate fixing frame, a pointer type wave plate angle positioning frame and a universal interface lens cone; the wave plate rotating frame is rotatably connected with the wave plate fixing frame, the 1 / 4 wave plate is installed on the wave plate rotating frame, the wave plate fixing frame is fixedly connected with the pointer type wave plate angle positioning frame, and the wave plate fixing frame and the pointer type wave plate angle positioning frame are connected with the linear polaroid module through the universal interface lens cone. Compared with the prior art, the multi-angle combination device is simple in structure and convenient to assemble, can be used for multi-angle combination of polarization elements such as 1 / 4 wave plates and linear polarizers with different wavelengths, and has important application value in research of polarization state change in an optical system, measurement of full-polarization parameters with different wavelengths and the like.

Description

TECHNICAL FIELD

[0001] The utility model belongs to polarization detection field relates to a kind of three-wavelength full polarization detection device of assembly. BACKGROUND

[0002] Light wave contains four independent information of amplitude, wavelength, phase and polarization, and polarization information has been proved to effectively improve the contrast of target and background, and can simultaneously obtain multi-dimensional information such as appearance characteristics, material complex refractive index and surface roughness of target, with the new features of "weak light strengthening and strong light weakening". Polarization state is usually represented by Stokes vector, and only the first three components are used in the field of polarization remote sensing, but in some application fields (such as underwater imaging and defogging detection), the fourth component has more abundant circular polarization information and cannot be ignored. The technology that can obtain all four components of Stokes vector is called full polarization detection, so the research on full polarization detection method has become the goal that people always pursue.

[0003] Full polarization detection in imaging application is mainly divided into time-sharing polarization imaging and simultaneous polarization imaging. Time-sharing polarization imaging is to introduce a rotatable polarization element to collect intensity images of different polarization directions at different times to solve the polarization information, and the advantage is that the optical structure is simple, the experimental cost is low, and it is widely used in full polarization information acquisition of static target and various teaching experiments. At present, most of the time-sharing polarization imaging devices have single imaging mode, and the polarization information obtained is less and the structure is complex, and the price is expensive. In the time-sharing imaging device proposed in recent years, the patent number CN201910742402.1 is "time-sharing infrared polarization imaging device and method for dynamic target measurement" proposed by Beijing Environmental Characteristics Research Institute. The polarizer assembly between the lens and the detector is only provided with a polaroid, i.e. only linear polarization information can be obtained, without circular polarization information, and the measurement wavelength is limited, which is not conducive to obtaining more full polarization information in multiple scenes. UTILITY MODEL CONTENTS

[0004] The utility model relates to a kind of three-wavelength full polarization detection device of assembly, mainly used for laser polarization state (or target scene) three-wavelength full polarization detection, and it is a kind of polarization information multiple, full polarization detection device with low production cost and dismountable.

[0005] The utility model provides a kind of three-wavelength full polarization detection device of assembly, including 1 / 4 wave sheet module and linear polaroid module;1 / 4 wave sheet module includes: wave sheet rotating frame, 1 / 4 wave sheet, wave sheet fixed frame, pointer type wave sheet angle positioning frame and general interface lens barrel;Wave sheet rotating frame is connected with wave sheet fixed frame rotationally, 1 / 4 wave sheet is installed on wave sheet rotating frame, wave sheet fixed frame is fixedly connected with pointer type wave sheet angle positioning frame, and wave sheet fixed frame and pointer type wave sheet angle positioning frame are connected with linear polaroid module by general interface lens barrel.

[0006] Further, the wave plate rotating frame is a semi-hexahedron structure, comprising a wave plate clamping groove, a first circular clamping groove and a first rotating shaft hole, the wave plate clamping groove is used for mounting 1 / 4 wave plates of different wavelengths; the first rotating shaft hole is used for rotating connection with the wave plate fixing frame; the first circular clamping groove is arranged at equal intervals on a circumference with the first rotating shaft hole as the center, so that the semi-hexahedron is fixedly connected with the wave plate fixing frame after being rotated to a proper position.

[0007] Further, the wave plate fixing frame is provided with a second rotating shaft hole and a second circular clamping groove, the second rotating shaft hole is coaxially and rotatably connected with the first rotating shaft hole, and the second circular clamping groove is used for cooperation with the first circular clamping groove and is fixed by a pin shaft, so as to realize positioning of the 1 / 4 wave plate of the current wavelength.

[0008] Further, the pointer type wave plate angle positioning frame comprises a mounting seat, a pointer and positioning cylinders, the two positioning cylinders are fixedly arranged on the same straight line of the mounting seat, and the pointer is fixed on the positioning cylinders and the symmetry center axis is perpendicular to the center line of the two positioning cylinders.

[0009] Further, the center of the positioning cylinder is provided with a second threaded hole, and the second threaded hole is provided with a screw, and the screw is tightened, so that the pointer type wave plate angle positioning frame is fixed relative to the linear polarizer module.

[0010] Further, the center of the mounting seat is provided with a third threaded hole, and the center axis of the wave plate fixing frame is provided with a first threaded hole, both of which are used for cooperation with the external thread of one end of the general interface lens barrel, so as to realize rotation of the 1 / 4 wave plate module relative to the linear polarizer module.

[0011] Further, the linear polarizer module comprises a linear polarizer mounting block and a linear polarizer, the fourth threaded hole is arranged in the linear polarizer mounting block and is used for mounting and fixing the general interface lens barrel and the linear polarizer, and the linear polarizer is mounted in the fourth threaded hole away from the general interface lens barrel.

[0012] Further, the wave plate clamping groove, the wave plate fixing frame, the pointer type wave plate angle positioning frame, the general interface lens barrel and the linear polarizer mounting module are coaxial, and all the light transmission holes have a diameter of 1 inch.

[0013] Compared with the prior art, the three-wavelength full polarization detection device provided by the utility model has the beneficial effects that:

[0014] (1) In the utility model, the position of the three planes of the semi-hexahedron wave plate rotating frame is rotated, the current working wavelength of the device is changed, and then the measurement of the multi-wavelength full polarization parameter can be realized.

[0015] (2) The utility model discloses, can through the different angle combination of 1 / 4 wave sheet and linear polarizer can extract linear polarization, circular polarization polarization information.

[0016] (3) The utility model discloses, three wavelengths 1 / 4 wave sheet module and linear polarizer module in full polarization detection device can be connected through screw thread, and these components can be manually assembled into a complete experimental device, and the operation method is simple and convenient. Rotating half hexahedron can realize the switching of 1 / 4 wave sheet, and the fixing screw on half hexahedron can be screwed to fix half hexahedron, so that it will not rotate in the experimental process. The design of the pointer can mark and position the 1 / 4 wave sheet fast and slow axis position, so as to carry out accurate measurement, improve the efficiency and accuracy of the experiment, and help students understand the polarization detection process and exercise the operation ability of students in experimental teaching.

[0017] (4) The utility model discloses, and the half hexahedron wave sheet hole, general interface lens barrel and linear polarizer installation module of experimental device adopt the general 1 inch diameter design, can be well compatible with most general devices on the market. The practicability and flexibility of the device are improved, and the device can be used for full polarization detection and full polarization imaging.

[0018] (5) Compact structure. The device assembles rotatable three wavelengths half hexahedron, 1 / 4 wave sheet and mounting seat, polarizer and mounting seat on optical element adjusting frame. The total length is less than 60mm, and the total width is less than 72mm, the layout is compact, and the volume is small, so that the realization of portable polarization detection device is possible. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The utility model is applied to the principle diagram of three wavelengths full polarization detection, wherein (a) is full polarization detection device 0 degree state (measures I L (0°)), (b) is full polarization detection device overturning 180 degree state (measures I C (0°), I C (45°), I C (90°)).

[0020] Figure 2 The overall structural drawing of the utility model

[0021] Figure 3 The half hexahedron wave sheet rotating frame of the utility model

[0022] Figure 4 The three wavelengths wave sheet fixing frame of the utility model

[0023] Figure 5 The pointer type wave sheet angle positioning frame of the utility model

[0024] Figure 6The linear polarizer module structure

[0025] Figure 7 The utility model is applied to the assembly principle drawing of experimental measurement

[0026] Figure 8 The utility model is applied to the assembly step drawing of experimental measurement DETAILED DESCRIPTION

[0027] The terms used in the utility model are only for the purpose of explaining the utility model embodiments, and are not for limiting the utility model. Figures 1-8 Some embodiments of the utility model are described in detail.

[0028] As Figure 1 The utility model is applied to the principle drawing of three-wavelength full polarization detection, and the dotted box is the overall structure design drawing of the three-wavelength full polarization detection device of the utility model. Three-color laser (or target scene) generates polarization information, and the polarization information enters three-wavelength 1 / 4 wave plate module and linear polarizer module as the polarization state to be measured, and finally enters optical power meter (or CCD detector) and computer. The device assembles three-wavelength 1 / 4 wave plate module, linear polarizer and mounting seat on the optical element adjusting frame, is compact in layout, is convenient to assemble and is low in cost. The device can carry out multi-angle combination of polarization elements such as 1 / 4 wave plate and linear polarizer, and has important application value in measuring full polarization information such as linear polarization, circular polarization and elliptical polarization of multiple wavelengths.

[0029] As Figure 2 A three-wavelength full polarization detection device can be assembled, comprising three-wavelength 1 / 4 wave plate module and linear polarizer module 5.

[0030] The three-wavelength 1 / 4 wave plate module comprises half hexahedral wave plate rotating frame 1, three-wavelength 1 / 4 wave plate, three-wavelength wave plate fixing frame 2, pointer type wave plate angle positioning frame 3 and general interface lens barrel 4.

[0031] As Figure 3 The above half hexahedral wave plate rotating frame 1 comprises wave plate clamping groove 101, first circular clamping groove 102 and first rotating shaft hole 103. The wave plate clamping groove 101 is used for installing three-wavelength 1 / 4 wave plate, the first rotating shaft hole 103 is used for rotating connection with three-wavelength wave plate fixing frame 2, and the first circular clamping groove 102 is arranged at equal intervals on the circumference with the first rotating shaft hole 103 as the center and is used for coaxially fixing the half hexahedral rotating frame to the second circular clamping groove 202 after the half hexahedral rotating frame is rotated to the appropriate position and is fixed to three-wavelength wave plate fixing frame 2.

[0032] As Figure 4The second rotation shaft hole 201 is coaxially connected with the first rotation shaft hole 103, the half-hexahedron wave plate rotating frame 1 can rotate around the shaft, and the three-wavelength wave plate is selected.

[0033] As Figure 5 The pointer 302 is fixed on the mounting seat 303, and the symmetric center axis is perpendicular to the center line of the two positioning cylinders 301.

[0034] The second threaded hole in the center of the positioning cylinder 301 is provided with a screw, and the screw is tightened, so that the pointer type wave plate angle positioning frame 3 is fixed relative to the linear polarizer module 5.

[0035] The three-wavelength wave plate fixing frame 2 and the pointer type wave plate angle positioning frame 3 are fixedly connected.

[0036] As Figure 1 The universal interface lens barrel 4 is a hollow structure, and the outer circle is provided with a thread. One end of the universal interface lens barrel 4 is fixedly connected with the linear polarizer module 5 through the thread, and the outer thread of the other end of the universal interface lens barrel 4 is matched with the third threaded hole in the mounting seat 303 and the first threaded hole in the three-wavelength wave plate fixing frame 2, so that the angle adjustment between the three-wavelength wave plate fixing frame 2 and the pointer type wave plate angle positioning frame 3 and the linear polarizer module 5 is realized.

[0037] As Figure 6 The linear polarizer module 5 includes a linear polarizer mounting block and a linear polarizer. The fourth threaded hole in the linear polarizer mounting block is used for mounting and fixing the universal interface lens barrel 4 and the linear polarizer, and the linear polarizer is mounted in the fourth threaded hole away from the universal interface lens barrel 4.

[0038] The circumference of the linear polarizer mounting block is engraved with an angle. The relative angle between the linear polarizer module 5 and the pointer type wave plate angle positioning frame 3 can be adjusted, so that the arbitrary angle combination of the 1 / 4 wave plate and the linear polarizer can be realized by cooperating with the pointer 302.

[0039] When the fixed linear polarizer module 5 is fixed, the pointer 302 is rotated, so that the pointer wave plate angle positioning frame 3 in the three-wavelength 1 / 4 wave plate module and the three-wavelength wave plate fixing frame 2 are rotated together around the horizontal center axis of the device, and after being rotated to a predetermined angle, the screw in the second threaded hole in the center of the positioning cylinder 301 is tightened, the assembly of the device is completed, and the reading of the pointer 302 can represent the angle between the 1 / 4 wave plate and the polarizer.

[0040] The overall device layout of the full polarization detection device is compact, and the total length is less than 60mm and the total width is less than 72mm.

[0041] The selection of each device in the utility model is:

[0042] (1) The 1 / 4 wave plate adopts a quartz multi-stage wave plate, and the models of the three 1 / 4 wave plates are GCL-060641, GCL-060623 and GCL-060642 respectively, the working wavelengths are 450nm, 532nm and 650nm respectively, the phase delay accuracy is λ / 40-λ / 120, and the diameter is Φ25.4mm.

[0043] (2) The linear polarizer adopts a composite film linear polarizer, the model is GCL-050003, the antireflection wavelength is 400-760nm, the extinction ratio is 300:1, and the diameter is Φ25.4mm.

[0044] (3) The optical filter is used in the polarization light detection experiment and is arranged at the front end of the full polarization detection device. The optical filter adopts a central wavelength of 450nm, 532nm and 650nm, the filter is GCC-202001, GCC-202011 and GCC-202010, the half bandwidth is 10mn, and the diameter is Φ25.4mm.

[0045] (4) The photoelectric power measuring instrument is used in the polarization light detection experiment and is used for detecting the light intensity of the outgoing light of the full polarization detection device on the white screen. A photoelectric power measuring instrument with higher accuracy is used, that is, a PM400 multi-point touch handheld measuring instrument, and the light power range is 100nW to 500mW.

[0046] (5) The area detector is a CCD camera of CS165mu of THORLAB company, which is used in the polarization light detection experiment and is used for detecting the full polarization image information of the outgoing full polarization of the full polarization detection device; the CCD area of the camera is 1 / 2.9 inches, the pixel size is 3.45um*3.45um, the resolution is 1440*1080 (160MP), USB3.0 interface is used for data transmission, and portable notebook computer transmission and power supply can be supported.

[0047] In this embodiment, the wave plate card slot 101, the three-wavelength wave plate fixing frame 2, the pointer type wave plate angle positioning frame 3, the general interface lens barrel 4 and the linear polarizer installation module 5 are coaxial, and the light transmission holes are of the same diameter of 1 inch, which can well compatible with most general devices on the market. The practicability and flexibility of the device are improved, and the device can be used for measuring full polarization detection and full polarization imaging.

[0048] As shown in Figure 7 and Figure 8 , the method for testing in this embodiment is as follows:

[0049] S1: test bench building: sequentially set up a laser, a polarizer P0, a linear polarizer module 5 (the module is called a polarizer P in this test) and a white screen;

[0050] Among them, the instrument platform is adjusted to be horizontal; the laser is adjusted to be horizontal; according to the wavelength of the laser, the semi-hexahedral wave plate rotating frame 1 is rotated to select the 1 / 4 wave plate corresponding to the wavelength.

[0051] S2: full polarization detection device debugging;

[0052] S2.1: P0 is set in the vertical y direction, the polarizer P is rotated to make the light disappear on the white screen or the light power meter is used to observe the extinction, at this time the light transmission direction of the polarizer P is the horizontal x direction.

[0053] S2.2: insert the three-wavelength 1 / 4 wave plate module QW between P0 and P (i.e. thread the three-wavelength 1 / 4 wave plate module QW into the fourth threaded hole of the linear polarizer installation block of the linear polarizer module 5), rotate the three-wavelength 1 / 4 wave plate module QW to make the light disappear again.

[0054] S2.3: rotate the three-wavelength 1 / 4 wave plate module QW by 45 degrees counterclockwise (or clockwise) against the light direction, tighten the screw in the positioning cylinder 301, fix the three-wavelength 1 / 4 wave plate module QW with the polarizer P (linear polarizer module 5), and the linear polarizer module 5 and the three-wavelength 1 / 4 wave plate module QW form a full polarization detection device.

[0055] S2.4: turn the full polarization detection device obtained in step (4) by 180 degrees, and record the current pointer angle as the starting angle of the full polarization detection device measurement: 0 degrees.

[0056] S3: place the corresponding filter in front of the full polarization detection device.

[0057] S4: measure and calculate the full polarization information:

[0058] S4.1: use the assembled full polarization detection device to measure the power of the 0°, 45° and 90° outgoing light (recorded as IC (0°), I C (45°), I C (90°)); turn the full-polarization detection device 180°, measure the light intensity (power) of the full-polarization detection device at 0 degree (denoted as I L (0°)

[0059] S4.2: substitute the four light intensity values I C (0°), I C (45°), I C (90°), I L (0°) into formula (1) (the formula is a calculation formula of counterclockwise QW rotation in step (5), and the formula needs to be rewritten when QW rotates clockwise) to obtain the Stokes parameters (S0, S1, S2, S3) of the incident light.

[0060]

[0061] After the Stokes parameters are obtained, the degree of polarization, the long-axis polarization direction, the elliptical polarization ratio, the left and right rotation direction and other information can be calculated, and the quantitative measurement of full-polarization information is realized.

[0062] The utility model patent can assemble the 1 / 4 wave plate fast axis direction and the polaroid direction to be any angle, and the above steps are only examples taking the included angle of 45 degrees.

[0063] As another implementation of S3 in the embodiment, the embodiment can also obtain full-polarization image information by using CCD imaging, respectively correct the four-angle images obtained, image registration, eliminate the error caused by image offset, substitute the corrected images into formula (1), and calculate the Stokes parameters (S0, S1, S2, S3) of the current wavelength, and then obtain the full-polarization information map such as the polarization degree image, the circular polarization degree image, the polarization angle image and the elliptical polarization angle image, and the calculation method is as follows:

[0064] Degree of polarization (DOP): 0≤DOP≤1

[0065] Degree of linear polarization (DOLP): 0≤DOLP≤1

[0066] Degree of circular polarization (DOCP): 0≤DOCP≤1

[0067] Angle of polarization (AOP):

[0068] Ellipticity rate:

[0069] Although the embodiments of the utility model have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the utility model, and the ordinary skilled in the art can change, modify, replace and transform the above-mentioned embodiments within the scope of the utility model without departing from the principles and purposes of the utility model.

Claims

1. An assemblable three-wavelength full-polarization detection device, characterized in that, The 1 / 4 wave plate module and the linear polarizer module are included. The 1 / 4 wave plate module comprises a wave plate rotating frame, a 1 / 4 wave plate, a wave plate fixing frame, a pointer type wave plate angle positioning frame and a universal interface lens barrel; the wave plate rotating frame is rotationally connected with the wave plate fixing frame, the 1 / 4 wave plate is installed on the wave plate rotating frame, the wave plate fixing frame is fixedly connected with the pointer type wave plate angle positioning frame, and the wave plate fixing frame and the pointer type wave plate angle positioning frame are connected with the linear polarizer module through the universal interface lens barrel.

2. The assemblable three-wavelength full-polarimetric detection device according to claim 1, characterized in that, The wave plate rotating frame is a semi-hexahedron structure comprising a wave plate clamping groove, a first circular clamping groove and a first rotating shaft hole; the wave plate clamping groove is used for installing 1 / 4 wave plates of different wavelengths; and the first rotating shaft hole is used for rotationally connecting with the wave plate fixing frame. The first circular clamping groove is arranged at equal intervals on a circumference with the first rotating shaft hole as the center, so that the semi-hexahedron is fixedly connected with the wave plate fixing frame after being rotated to a proper position.

3. The assemblable three-wavelength full-polarimetric detection device according to claim 2, characterized in that, The wave plate fixing frame is provided with a second rotating shaft hole and a second circular clamping groove; the second rotating shaft hole is coaxially rotationally connected with the first rotating shaft hole; and the second circular clamping groove is used for cooperating with the first circular clamping groove and being fixed through a pin shaft, so as to realize positioning of the 1 / 4 wave plate of the current wavelength.

4. The assemblable three-wavelength full-polarimetric detection device according to claim 1, characterized in that, The pointer type wave plate angle positioning frame comprises a mounting seat, a pointer and positioning cylinders; two positioning cylinders are fixedly arranged on the same straight line of the mounting seat; and the pointer is fixed on the positioning cylinders and the symmetric center axis is perpendicular to the connecting line of the centers of the two positioning cylinders.

5. The assemblable three-wavelength full-polarimetric detection device according to claim 4, characterized in that, A second threaded hole is arranged in the center of the positioning cylinder and a screw is arranged in the second threaded hole; the screw is tightened, so that the pointer type wave plate angle positioning frame is fixed relative to the linear polarizer module.

6. The assemblable three-wavelength full-polarimetric detection device according to claim 4, characterized in that, A third threaded hole is arranged in the center of the mounting seat, and a first threaded hole is arranged on the center axis of the wave plate fixing frame, both of which are used for cooperating with the external thread of one end of the universal interface lens barrel, so as to realize rotation of the 1 / 4 wave plate module relative to the linear polarizer module.

7. The assemblable three-wavelength full-polarimetric detection device according to claim 1, characterized in that, The linear polarizer module comprises a linear polarizer mounting block and a linear polarizer; a fourth threaded hole is arranged in the linear polarizer mounting block and is used for mounting and fixing the universal interface lens barrel and the linear polarizer; and the linear polarizer is mounted in the fourth threaded hole away from the universal interface lens barrel.

8. The assemblable three-wavelength full-polarimetric detection device according to claim 2, characterized in that, The wave plate clamping groove, the wave plate fixing frame, the pointer type wave plate angle positioning frame, the universal interface lens barrel and the linear polarizer mounting module are coaxial, and all the light transmission holes have a diameter of 1 inch.

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