Multi-channel rotary scanning polarization filtering control system based on electromagnetic driving

Abstract

The invention relates to a multichannel rotary scanning polarization filtering control system based on electromagnetic driving, which comprises a driving control module, a current driving module, a multichannel rotary scanning polarization filtering device and an angle acquisition module which are connected in sequence, and is characterized in that the driving control module sends out a pulse signal and inputs the pulse signal into the current driving module; the current driving module integrates the pulse signal output by the driving control module and transmits the pulse signal into the multi-channel rotary scanning polarization filtering device, the multi-channel rotary scanning polarization filtering device is started and operated, and counting pulse is output; reading the counting pulse through an angle acquisition module to obtain polarization angle information; whether the polarization angle information reaches a preset polarization angle or not is judged through the driving control module, and when the polarization angle information reaches the preset polarization angle, the driving control module sends out a trigger signal to trigger the camera to shoot. Compared with the prior art, the polarization angle information is accurately collected, the angle control error is reduced, and the high-precision control requirement is met.

Description

Technical Field

[0001] The invention relates to the technical field of polarization detection, and in particular to a multi-channel rotating scanning polarization filtering system based on electromagnetic driving. Background Art

[0002] Polarization imaging technology is an advanced imaging method that uses the polarization characteristics of light to obtain material properties and scene features that cannot be detected by conventional imaging technology. By analyzing the polarization state of light reflected or transmitted by an object, this technology can extract additional information such as the surface characteristics, shape, material composition, and internal structure of the object. It is widely used in many fields such as biomedicine, remote sensing, real-time monitoring, military reconnaissance, and missile guidance.

[0003] The core of the polarization detection system is to efficiently obtain target images at different polarization angles through the imaging system, and analyze the polarization information of the target in combination with the processing algorithm. The performance of the polarization imaging system directly determines the efficiency of polarization information acquisition and is a key link in polarization imaging technology. Therefore, in recent years, the research and development of polarization imaging systems has become a hot research direction in this field.

[0004] In the existing research on rotating scanning polarization filtering systems, commonly used rotating scanning driving methods include electrostatic driving, thermal driving and piezoelectric driving. However, each driving method has its own limitations: electrostatic driving requires a higher driving voltage and has a smaller output torque; thermal driving has a slow response speed, high power consumption and low efficiency; although piezoelectric driving has a higher output torque and accuracy, it is difficult to increase its speed, and there are significant nonlinear problems, which makes the control system design complicated. In the prior art, the rotating scanning acquisition method of polarization information mainly adopts the rotary wheel type and the stepper motor type. However, the rotary wheel type rotating mechanism is limited by hardware and can usually only collect polarization angle information of a small number of channels. It cannot achieve high-speed rotation due to volume limitations, resulting in low acquisition efficiency; the stepper motor type rotating mechanism needs to use gears to convert the angle due to the non-coaxial design of its rotating axis and the light hole, and the angle control error is large, which is difficult to meet the high-precision control requirements. Summary of the invention

[0005] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and to provide a multi-channel rotating scanning polarization filtering system based on electromagnetic drive, so as to achieve precise positioning and high-speed coordination of the rotation angle, reduce the angle control error, and meet the high-precision control requirements.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] A multi-channel rotating scanning polarization filtering control system based on electromagnetic drive, comprising a driving control module, a current driving module, a multi-channel rotating scanning polarization filtering device and an angle acquisition module connected in sequence, wherein the driving control module sends a pulse signal to be input into the current driving module; the current driving module integrates the pulse signal output by the driving control module and outputs a corresponding current signal, transmits the current signal to the multi-channel rotating scanning polarization filtering device, starts the multi-channel rotating scanning polarization filtering device, and outputs a counting pulse; the counting pulse is read by the angle acquisition module to obtain polarization angle information; the driving control module is used to determine whether the polarization angle information reaches a preset polarization angle, and when the polarization angle information reaches the preset polarization angle, the driving control module sends a trigger signal to perform image acquisition;

[0008] Wherein, the multi-channel rotating scanning polarization filtering device comprises: a bottom cover module, a photoelectric counting module, a rotating module, a coil winding PCB board and a top cover module, the photoelectric counting module is installed on the bottom cover module, the rotating module is installed on the photoelectric counting module by interference fit, the coil winding PCB board is installed on the top cover module, the coil winding PCB board and the top cover module are installed on the bottom cover module, the coil winding PCB board receives the current signal output by the current driving module and generates a magnetic field, drives the rotating module to rotate, and obtains the counting pulse generated by the rotation of the rotating module through the photoelectric counting module.

[0009] Furthermore, the bottom cover module comprises a bottom shell, and the bottom shell is provided with a light-through hole and a mounting hole.

[0010] Furthermore, the bottom cover module also includes fixing bolts, and the multi-channel rotating scanning polarization filtering device is installed on other equipment through the installation holes and the fixing bolts.

[0011] Furthermore, the photoelectric counting module includes a raised bottom block and a PCB board provided with a reflective photoelectric switch and its operating circuit, the raised bottom block is provided with a light-through hole, and the PCB board provided with a reflective photoelectric switch and its operating circuit is provided with a light-through hole.

[0012] Furthermore, the rotating module includes a deep groove ball bearing, a rotor, a linear polarizer and a fixing ring. A light-through hole is provided at the center of the rotor. The deep groove ball bearing is installed on the rotating shaft of the rotor by interference fit. The linear polarizer is installed in the light-through hole at the center of the rotor by a fixing ring.

[0013] Furthermore, a reflective film code disk is arranged on the back of the rotor, and the reflective film code disk is installed at the same radius as the reflective photoelectric switch.

[0014] Furthermore, the rotating module also includes a magnetic core, and the rotor is provided with iron core slots arranged in a circumferential array along the radial direction, and the magnetic core and the iron core slots are installed by interference fit.

[0015] Furthermore, the material of the deep groove ball bearing includes multiple materials selected from the group consisting of plastic, glass, ceramic, alloy or resin.

[0016] Furthermore, multiple layers of coil windings are printed inside the coil winding PCB board, and the coil windings are arranged in a spiral shape. Every two layers of the coil windings form a phase coil, and the coils of each phase differ by 15°.

[0017] Furthermore, the top cover module includes studs, fixing bolts and a top shell, the coil winding PCB board is fixed to the top shell through the studs, a light-through hole is provided on the top shell, the fixing bolts fix the top cover module and the bottom cover module, and limit the distance between the coil winding PCB board and the rotating module.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention sends a pulse signal through the drive control module and inputs it into the current drive module; the current drive module integrates the pulse signal output by the drive control module and outputs a corresponding current signal, transmits the current signal to the multi-channel rotating scanning polarization filter device, starts the multi-channel rotating scanning polarization filter device, and outputs a counting pulse; the counting pulse is read by the angle acquisition module to obtain polarization angle information; the drive control module determines whether the polarization angle information reaches the preset polarization angle, and when the polarization angle information reaches the preset polarization angle, the drive control module sends a trigger signal to collect images. This effectively solves the limitation of the traditional rotating scanning device that can only obtain limited polarization information during low-speed position control, and the problem that it is difficult to accurately detect the target polarization state during high-speed control.

[0020] 2. The present invention adopts a coaxial design of the rotating shaft and the light-through hole, installs the deep groove ball bearing on the rotating shaft of the rotor through an interference fit, and installs the linear polarizer in the light-through hole in the center of the rotor through a fixed retaining ring. The rotation angle information is accurately obtained through the cooperation of the metal reflective film code disk and the reflective photoelectric switch, thereby realizing accurate collection of polarization angle information under high-speed operation, reducing angle control errors, and meeting high-precision control requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of the electromagnetically driven multi-channel rotating scanning polarization filtering control system proposed by the present invention;

[0022] Figure 2It is a structural schematic diagram of a multi-channel rotating scanning polarization filter device;

[0023] Figure 3 An exploded diagram of a multi-channel rotating scanning polarization filter device;

[0024] Figure 4 It is a structural schematic diagram of a reflective film code disc;

[0025] Figure 5 It is a pulse signal diagram accurately outputted by the rotation angle of the multi-channel rotating scanning polarization filter device;

[0026] Legend: 100, bottom cover module; 110, photoelectric counting module; 120, rotation module; 130, coil winding PCB board; 140, top cover module; 201, fixing bolt; 202, bottom shell; 211, raising bottom block; 212, PCB board with reflective photoelectric switch and its operating circuit; 221, deep groove ball bearing; 222, rotor; 223, linear polarizer; 224, fixing snap ring; 225, magnetic core; 241, stud; 242, fixing bolt; 243, top shell; 300, drive control module; 310, current drive module; 320, multi-channel rotating scanning polarization filter device; 330, angle acquisition module. DETAILED DESCRIPTION

[0027] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0028] Example 1

[0029] This embodiment provides a multi-channel rotating scanning polarization filtering control system based on electromagnetic drive, such as Figure 1 As shown, it includes a driving control module 300, a current driving module 310, a multi-channel rotating scanning polarization filtering device 320 and an angle acquisition module 330 which are connected in sequence.

[0030] The drive control module 300 sends a pulse signal to the current drive module 310; the current drive module 310 integrates the pulse signal output by the drive control module 300 and outputs a corresponding current signal, and transmits the current signal to the multi-channel rotating scanning polarization filter device 320, starts the operation of the multi-channel rotating scanning polarization filter device 320, and outputs a counting pulse; the counting pulse is read by the angle acquisition module 330 to obtain the polarization angle information; the drive control module 300 determines whether the polarization angle information reaches the preset polarization angle. When the polarization angle information reaches the preset polarization angle, the drive control module 300 sends a trigger signal to perform image acquisition.

[0031] The drive control module 300 and the angle acquisition module 330 can be a minimum system that integrates a microcontroller and its basic peripheral circuits, has independent operation and signal processing capabilities, and can serve as a core control unit to provide stable and reliable control functions.

[0032] The current driving module 310 can be any multi-channel H-bridge, supports PWM control, and can be used to drive a DC motor or a stepper motor.

[0033] In this embodiment, the drive control module 300 and the angle acquisition module 330 both use the minimum system board with the chip model STM32F103C8T6. The current drive module 310 uses a four-way DC motor drive module equipped with two chips with the chip model MX1616H.

[0034] The multi-channel rotating scanning polarization filtering device 320 includes: a bottom cover module 100, a photoelectric counting module 110, a rotating module 120, a coil winding PCB board 130 and a top cover module 140. The photoelectric counting module 110 is installed on the bottom cover module 100, the rotating module 120 is installed on the photoelectric counting module 110 by interference fit, the coil winding PCB board 130 is installed on the top cover module 140, the coil winding PCB board 130 and the top cover module 140 are installed on the bottom cover module 100, the coil winding PCB board 130 receives the current signal output by the current driving module 310 and generates a magnetic field, drives the rotating module 120 to rotate, and obtains the counting pulse generated by the rotation of the rotating module 120 through the photoelectric counting module 110.

[0035] A pulse signal is sent out through the driving control module 300, and the pulse signal is input into the input end of the current driving module 310; the driving control module 300 sends out a pulse signal from its 6 GPIO pins, of which 3 GPIO pins simulate PWM output ends and are connected to the INA1, INA2, and INA3 input ends of the current driving module 310, and the other 3 GPIO pins serve as logic control ends and are connected to the INB1, INB2, and INB3 input ends of the current driving module 310.

[0036] The current signal outputted from the output end of the current driving module 310 is transmitted to the multi-channel rotating scanning polarization filtering device 320; the output ends OUT1, OUT2, and OUT3 of the current driving module 310 then transmit the three-channel pulse signal to the three input ends of the multi-channel rotating scanning polarization filtering device 320. The three-channel pulse signal is a three-channel pulse with a phase difference of 120°.

[0037] After receiving the pulse signal from the output end of the current driving module 310, the multi-channel rotating scanning polarization filter device 320 rotates and transmits a pulse signal; the multi-channel rotating scanning polarization filter device 320 receives the pulse signal from the output end of the current driving module 310 and starts to rotate. At this time, a pulse signal is transmitted every time the internal rotor of the multi-channel rotating scanning polarization filter device 320 rotates 1°.

[0038] The angle acquisition module 330 reads the counting pulses transmitted from the multi-channel rotating scanning polarization filter device 320 and performs angle counting. The angle acquisition module 330 continuously reads the pulse signals transmitted from the multi-channel rotating scanning polarization filter device 320 and performs angle counting to obtain polarization angle information.

[0039] The angle acquisition module 330 performs angle counting by reading the rising and falling edges of the pulse signal to determine the angle. Figure 5 As shown in the figure, the adjacent rising and falling edges of the pulse signal are 1°, and the polarization angle information can be accurately obtained by reading the number of pulses.

[0040] Example 2

[0041] This embodiment provides a multi-channel rotating scanning polarization filter device 320 based on an electromagnetically driven multi-channel rotating scanning polarization filter system, such as Figure 3 shown.

[0042] The multi-channel rotating scanning polarization filtering device 320 includes: a bottom cover module 100, a photoelectric counting module 110, a rotating module 120, a coil winding PCB board 130 and a top cover module 140. The photoelectric counting module 110 is installed on the bottom cover module 100 through a nut, the rotating module 120 is installed on the photoelectric counting module 110 through an interference fit, the coil winding PCB board 130 is fixed to the top cover module 140 through a stud 241, and the coil winding PCB board 130 and the top cover module 140 are fixed to the bottom cover module 100 through the stud 241 and the fixing bolt 242.

[0043] The bottom cover module 100 includes a fixing bolt 201 and a bottom shell 202 , and a light-through hole is provided on the bottom shell 202 .

[0044] The photoelectric counting module 110 includes a raised bottom block 211 and a PCB board 212 provided with a reflective photoelectric switch and its operating circuit. The raised bottom block 211 is used to reduce the friction between the rotating module 120 and the bottom shell 202. A light-through hole is provided on the raised bottom block 211, and a light-through hole is provided on the PCB board 212 provided with a reflective photoelectric switch and its operating circuit.

[0045] The rotating module 120 includes a deep groove ball bearing 221 , a rotor 222 , a linear polarizing plate 223 , a fixing ring 224 and a magnetic core 225 . A reflective film code disc is disposed on the back of the rotor 222 .

[0046] In this embodiment, a pulse signal is transmitted every time the rotor 222 rotates 1°, that is, the PCB board 212 welded with the reflective photoelectric switch and its operating circuit is used in conjunction with the rotor 222 with a reflective film code disk on the back. When the photoelectric switch is located on the absorption surface and the reflection surface of the reflective film code disk, different output signals will be presented. When the photoelectric switch is located on the reflection surface of the reflective film code disk, a high level of 3.3v is output, and when it is located on the absorption surface of the reflective film code disk, a low level of 0v is output.

[0047] The coil winding PCB board 130 generates a magnetic field change after power is turned on. Six layers of coil windings are printed inside the PCB board 130. The coil windings are arranged in a spiral shape. Every two layers of coil windings form a phase coil. The phase difference of each phase coil is 15°. When an alternating current is passed, a circulating magnetic field is formed.

[0048] The top cover module 140 includes a stud 241, a fixing bolt 242 and a top shell 243. The stud 241 is used to fix the coil winding PCB board 130 on the top shell 243. The top shell 243 is provided with a light-through hole. The fixing bolt 242 is used to fix the top cover module 140 and the bottom cover module 100, and to limit the distance between the coil winding PCB board 130 and the rotor 222.

[0049] In this embodiment, the installation components are divided into two parts. The first part of the module specifically includes a bottom cover module 100, a photoelectric counting module 110 and a rotation module 120. The second part of the module specifically includes a coil winding PCB board 130 and a top cover module 140. Figure 2As shown, the first part of the module uses the bottom shell 202 as the installation reference, installs the raised bottom block 211 in the bottom shell 202, and keeps the coaxiality of the light aperture between the two. Then, the PCB board 212 welded with the reflective photoelectric switch and its operating circuit is installed above the raised bottom block 211, while keeping the coaxiality of the light aperture between the two. Then, the rotating module 120 is assembled, and the deep groove ball bearing 221 is installed on the shaft with the reflective film code disk rotor 222 on the back through interference fit. One end of the coil winding PCB board 130 is provided with iron core slots arranged in a circumferential array along the radial direction of the rotor 222, and 12 magnetic cores 225 are installed in the iron core slots of the reflective film code disk rotor 222 on the back through interference fit, and then the linear polarizer 223 is installed in the light aperture in the middle of the reflective film code disk rotor 222 on the back with a fixing ring 224. Then the assembled rotating module 120 is installed in the middle hole of the PCB board 212 welded with the reflective photoelectric switch and its operating circuit, so that the reflective photoelectric switch and the reflective film code disk are located at the same radius. The second part module is specifically fixed on the top shell 243 by the stud 241 and the fixing bolt 242 to fix the coil winding PCB board 130 in the order of placement, and finally the first part module and the second part module are fixed together with the fixing bolt 201. The rotor 222, the bottom shell 202 and the top shell 243 are made of plastic materials that do not generate magnetic fields spontaneously.

[0050] In this embodiment, the fixing bolt 201 is a hexagon socket bolt with a length of 5 mm and a diameter of M3. The bottom shell 202 is made of aluminum alloy material, and the shell size is 76 mm × 61 mm × 19 mm. The bottom block 211 is made of aluminum alloy and has a diameter in the middle. The PCB board 212 with the reflective photoelectric switch and its operating circuit welded on it adopts the PCB board with the reflective photoelectric switch model ITR8307 / TR8 and its operating circuit welded on it. The aperture of the deep groove ball bearing 221, with an inner diameter outer diameter The deep groove ball bearing 221 is made of a variety of materials including plastic, glass, ceramic, alloy or resin. The rotor 222 with a reflective film code disc on the back is made of aluminum alloy material. Clear Aperture The reflective area and the absorption area of ​​the back reflective film code disk are distributed in a ring shape and are spread over a circle at an interval of 1°. The specific structural diagram of the reflective film code disk is shown in the figure. Figure 4 The linear polarizer 223 uses a linear polarizer with a working wavelength of 400nm-700mm and an outer diameter of Thin film linear polarizer. The fixing clamp ring 224 adopts a clamp device with an external thread diameter of SM1, which is used to fix the linear polarizer. The magnetic core 225 is made of permanent magnet, and its size and shape are consistent with the core slot on the surface of the rotor 222 with a reflective film code disk on the back. The coil winding PCB board 130 adopts a printed circuit board made of FR-4 sheet material. Stud 241 adopts a hexagon socket bolt with a length of 7mm and an inner diameter of M3. The fixing bolt 242 adopts a hexagon socket bolt with a length of 5mm and a diameter of M3. The top shell 243 is made of aluminum alloy material, and the shell size is 76mm×61mm×2mm, with a diameter in the middle. The clear aperture.

[0051] The rest is the same as in Example 1.

[0052] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A multi-channel rotating scanning polarization filter control system based on electromagnetic drive, characterized in that: The invention comprises a driving control module (300), a current driving module (310), a multi-channel rotating scanning polarization filter device (320) and an angle acquisition module (330) which are connected in sequence, wherein the driving control module (300) sends a pulse signal which is input into the current driving module (310); the current driving module (310) integrates the pulse signal output by the driving control module (300) and outputs a corresponding current signal, and transmits the current signal into the multi-channel rotating scanning polarization filter device (320), starts the multi-channel rotating scanning polarization filter device (320) and outputs a counting pulse; the counting pulse is read by the angle acquisition module (330) to obtain polarization angle information; the driving control module (300) determines whether the polarization angle information reaches a preset polarization angle, and when the polarization angle information reaches the preset polarization angle, the driving control module (300) sends a trigger signal to perform image acquisition; The multi-channel rotating scanning polarization filter device (320) comprises: a bottom cover module (100), a photoelectric counting module (110), a rotating module (120), a coil winding PCB board (130) and a top cover module (140); the photoelectric counting module (110) is mounted on the bottom cover module (100); the rotating module (120) is mounted on the photoelectric counting module (110) by interference fit; the coil winding PCB board (130) is mounted on the top cover module (140); the coil winding PCB board (130) and the top cover module (140) are mounted on the bottom cover module (100); the coil winding PCB board (130) receives the current signal output by the current driving module (310) and generates a magnetic field, thereby driving the rotating module (120) to rotate; and the photoelectric counting module (110) obtains the counting pulse generated by the rotation of the rotating module (120).

2. The electromagnetically driven multi-channel rotating scanning polarization filtering control system according to claim 1 is characterized in that: The bottom cover module (100) comprises a bottom shell (202), and the bottom shell (202) is provided with a light-through hole and a mounting hole.

3. The electromagnetically driven multi-channel rotating scanning polarization filtering control system according to claim 2 is characterized in that: The bottom cover module (100) also includes a fixing bolt (201), and the multi-channel rotating scanning polarization filtering device (320) is installed on other equipment through the installation holes and the fixing bolt (201).

4. The electromagnetically driven multi-channel rotating scanning polarization filtering control system according to claim 1 is characterized in that: The photoelectric counting module (110) comprises a raised bottom block (211) and a PCB board (212) provided with a reflective photoelectric switch and an operating circuit thereof, wherein a light-through hole is provided on the raised bottom block (211), and a light-through hole is provided on the PCB board (212) provided with a reflective photoelectric switch and an operating circuit thereof.

5. The electromagnetically driven multi-channel rotating scanning polarization filtering control system according to claim 1, characterized in that: The rotating module (120) comprises a deep groove ball bearing (221), a rotor (222), a linear polarizing plate (223) and a fixing ring (224); a light-through hole is arranged at the center of the rotor (222); the deep groove ball bearing (221) is mounted on the rotating shaft of the rotor (222) by means of an interference fit; and the linear polarizing plate (223) is mounted in the light-through hole at the center of the rotor (222) by means of a fixing ring (224).

6. The electromagnetically driven multi-channel rotating scanning polarization filtering control system according to claim 5, characterized in that: A reflective film code disk is arranged on the back of the rotor (222), and the reflective film code disk is installed at the same radius as the reflective photoelectric switch.

7. The electromagnetically driven multi-channel rotating scanning polarization filtering control system according to claim 5, characterized in that: The rotating module (120) further comprises a magnetic core (225), and the rotor (222) is provided with iron core slots arranged in a circumferential array along the radial direction, and the magnetic core (225) and the iron core slots are installed by interference fit.

8. The electromagnetically driven multi-channel rotating scanning polarization filtering control system according to claim 5, characterized in that: The material of the deep groove ball bearing (221) includes multiple materials such as plastic, glass, ceramic, alloy or resin.

9. The electromagnetically driven multi-channel rotating scanning polarization filtering control system according to claim 1, characterized in that: The coil winding PCB board (130) has multiple layers of coil windings printed inside, the coil windings are arranged in a spiral shape, every two layers of the coil windings form a phase coil, and the phase difference of the coils in each phase is 15°.

10. The electromagnetically driven multi-channel rotating scanning polarization filtering control system according to claim 1, characterized in that: The top cover module (140) comprises a stud (241), a fixing bolt (242) and a top shell (243); the coil winding PCB board (130) is fixed to the top shell (243) via the stud (241); a light-through hole is provided on the top shell (243); the fixing bolt (242) fixes the top cover module (140) and the bottom cover module (100), and limits the distance between the coil winding PCB board (130) and the rotating module (120).

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