CN111175965B - Infrared imaging system and method based on optical filter wheel rotation imaging - Google Patents

Infrared imaging system and method based on optical filter wheel rotation imaging Download PDF

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Publication number
CN111175965B
CN111175965B CN202010126504.3A CN202010126504A CN111175965B CN 111175965 B CN111175965 B CN 111175965B CN 202010126504 A CN202010126504 A CN 202010126504A CN 111175965 B CN111175965 B CN 111175965B
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optical filter
photoelectric switch
baffle
detector
fan
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CN111175965A (en
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周潘伟
于洋
高思莉
李范鸣
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Shanghai Institute of Technical Physics of CAS
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Shanghai Institute of Technical Physics of CAS
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/007—Optical devices or arrangements for the control of light using movable or deformable optical elements the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light
    • G02B26/008—Optical devices or arrangements for the control of light using movable or deformable optical elements the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light in the form of devices for effecting sequential colour changes, e.g. colour wheels
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B11/00—Filters or other obturators specially adapted for photographic purposes
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B17/00—Details of cameras or camera bodies; Accessories therefor
    • G03B17/55—Details of cameras or camera bodies; Accessories therefor with provision for heating or cooling, e.g. in aircraft
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50—Constructional details
    • H04N23/51—Housings
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50—Constructional details
    • H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Astronomy & Astrophysics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Optics & Photonics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Blocking Light For Cameras (AREA)
  • Studio Devices (AREA)

Abstract

The invention discloses an infrared imaging system and an imaging method based on optical filter wheel rotation imaging. The system comprises an assembly shell, an upper cover plate, a heat dissipation cover plate, a circular electric connector, a lens cover plate, a substrate, an optical filter wheel lens assembly and a detector assembly. In the process of rotating the optical filter turntable anticlockwise and rapidly in a circulating way, the infrared detector can sequentially select wave bands to perform identifiable high-frame-frequency infrared multispectral imaging of different wave bands. The fan-shaped optical filter structure can realize high-frame frequency infrared multispectral imaging of an infrared imaging system in the rapid rotation of the optical filter, greatly reduce the cost, simplify the structural adjustment process, and enable the optical filter to be switched and controlled simply in the imaging of the system by using the photoelectric switch for feedback, and the control method is simple and feasible.

Description

Infrared imaging system and method based on optical filter wheel rotation imaging
Technical Field
The invention relates to an infrared imaging system, in particular to an infrared imaging system based on optical filter wheel rotation imaging and an imaging method.
Background
The infrared imaging system is a key system component for infrared imaging of a target by adopting an infrared detector and an infrared lens in infrared equipment, and optical imaging of different radiation wave bands can be carried out by installing an optical filter in front of the infrared detector. When using optical filters for imaging in infrared imaging systems, a plurality of optical filters are usually installed, and optical imaging of different radiation bands is performed by switching the optical filters. The currently developed optical filter switching device generally adopts mechanisms such as gears, screw rods and the like to carry out mechanical transmission, but the additional installation of the optical filter switching device in an infrared imaging system can make the assembly structure complicated, the volume large and the weight heavy, and the position feedback of the switching device is difficult, so that the control is complex and the cost is high. Meanwhile, the requirement of high-frame-rate infrared multispectral imaging in the optical filter switching is difficult to meet by adopting a general optical filter switching device.
Disclosure of Invention
The invention aims to provide an infrared imaging system and an imaging method based on optical filter wheel rotation imaging, which have the advantages of compact structure, simple control and low cost, wherein an optical filter wheel switching mechanism is additionally arranged in the infrared imaging system to complete imaging in optical filter rapid switching, the infrared imaging system has simple processing and low structural complexity, and is more suitable for mature market use and scientific research use, and the requirements of different-band high-frame-frequency infrared multispectral imaging are met.
In order to achieve the above purpose, the invention adopts the following technical scheme:
an infrared imaging system based on optical filter wheel rotation imaging comprises an assembly shell 1, an upper cover plate 2, a heat radiation cover plate 3, a circular electric connector 4, a lens cover plate 5, a base plate 6, an optical filter wheel lens assembly 7, a detector assembly 8, a power supply mounting plate 9, a power supply circuit board 10, a heat conducting rubber sheet 11, a control circuit board 12, a control board bracket I13 and a control board bracket II 14; the method is characterized in that:
the assembly shell 1 is of a hollow square shell structure which is formed by welding an aluminum alloy flat plate, a lens groove 1-1 is arranged on the left side of the assembly shell 1, a heat dissipation through hole 1-2 is arranged on the right part of the front side, a cover plate through hole 1-3 is arranged on the upper side, and an electric connector mounting hole 1-4 is arranged on the left part of the front side.
The optical filter wheel lens assembly 7 comprises an optical filter wheel base plate 7-1, an optical filter wheel base frame 7-2, a direct current brushless motor 7-3, an optical filter rotary disc 7-4, an optical filter I7-5, an optical filter II 7-6, an optical filter III 7-7, an optical filter IV 7-8, an optical filter pressing disc 7-9, an optical lens 7-10, a photoelectric switch bracket 7-11 and a photoelectric switch 7-12; the structure is as follows: the first optical filter 7-5, the second optical filter 7-6, the third optical filter 7-7 and the fourth optical filter 7-8 are all of a sector-shaped circular ring structure, and the sector central angle is 90 degrees; the optical filter turntable 7-4 is of a disc structure, a motor shaft mounting hole is formed in the center of the optical filter turntable, a first fan-shaped circular ring mounting groove 7-46, a second fan-shaped circular ring mounting groove 7-47, a third fan-shaped circular ring mounting groove 7-48 and a fourth fan-shaped circular ring mounting groove 7-49 are uniformly distributed on the circumference of the optical filter turntable 7-4 in a four-equal manner and are sequentially arranged in a clockwise direction, the first fan-shaped circular ring mounting groove 7-46, the second fan-shaped circular ring mounting groove 7-47, the third fan-shaped circular ring mounting groove 7-48 and the fourth fan-shaped circular ring mounting groove 7-49 are provided with optical filter mounting surfaces on the bottom surfaces, the first baffle 7-41, the second baffle 7-42, the third baffle 7-43, the fourth baffle 7-44 and the fifth baffle 7-45 are lugs which are sequentially arranged in the circumferential direction of the optical filter turntable 7-4, the first baffle 7-41 is arranged in the middle position between the first fan-shaped circular ring mounting groove 7-46 and the second fan-shaped circular ring mounting groove 7-47, the third fan-shaped circular ring mounting groove 7-42 is arranged in the middle of the fan-shaped circular ring mounting groove 7-47 and the middle position between the third fan-shaped circular ring mounting groove 7-48 and the fourth fan-shaped circular ring mounting groove 7-4, and the middle baffle 7-45 is arranged between the third fan-7-4 and the middle baffle 7-4; the optical filter wheel base frame 7-2 is fixedly arranged at the right part of the upper surface of the optical filter wheel base plate 7-1 through a screw, the direct current brushless motor 7-3 is fixedly arranged at the middle part of the optical filter wheel base frame 7-2 through a screw, an optical imaging lens is arranged in a central hole of the optical lens 7-10, and the optical lens 7-10 is fixedly arranged at the upper part of the optical filter wheel base frame 7-2 through a screw; the motor shaft mounting hole of the optical filter turntable 7-4 is sleeved on the output shaft of the DC brushless motor 7-3 and fixedly connected with the output shaft through a set screw, the optical filter I7-5 is mounted in the first 7-46 grooves of the fan-shaped circular ring mounting groove, the optical filter II 7-6 is mounted in the second 7-47 grooves of the fan-shaped circular ring mounting groove, the optical filter III 7-7 is mounted in the third 7-48 grooves of the fan-shaped circular ring mounting groove, the optical filter IV 7-8 is mounted in the fourth 7-49 grooves of the fan-shaped circular ring mounting groove, the optical filter pressing plate 7-9 is fixedly mounted on the front end face of the optical filter turntable 7-4 through a screw, and meanwhile the optical filter pressing plate 7-9 tightly fixes the optical filter I7-5, the optical filter II 7-6, the optical filter III 7-8 and the optical filter IV 7-8; the photoelectric switch bracket 7-11 is fixedly arranged at the left part of the upper surface of the optical filter wheel base plate 7-1 through a screw, and the photoelectric switch 7-12 is fixedly arranged on the front end surface of the photoelectric switch bracket 7-11 through a screw; when the brushless DC motor 7-3 is started to drive the optical filter turntable 7-4 to rotate anticlockwise, a system imaging light path imaged by the optical lens 7-10 sequentially circulates through the first optical filter 7-5, the second optical filter 7-6, the third optical filter 7-7 and the fourth optical filter 7-8, and the first blocking sheet 7-41, the second blocking sheet 7-42, the third blocking sheet 7-43, the fourth blocking sheet 7-44 and the fifth blocking sheet 7-45 sequentially also circulate through the detection groove of the photoelectric switch 7-12, and when any one of the first blocking sheet 7-41, the second blocking sheet 7-42, the third blocking sheet 7-43, the fourth blocking sheet 7-44 and the fifth blocking sheet 7-45 enters the detection groove of the photoelectric switch 7-12 to completely block the detection light of the photoelectric switch 7-12, the photoelectric switch 7-12 generates an electric signal.
The detector assembly 8 comprises a detector base 8-1, a detector lower base plate 8-2, a detector mounting plate 8-3 and an infrared detector 8-4; the structure is as follows: the detector base 8-1 upper surface have the optical correction boss, detector lower plate 8-2 bottom surface pass through screw and detector base 8-1 upper surface fixed connection, detector lower plate 8-2 pass through the optical correction boss horizontal displacement of detector base 8-1 about location and carry out the light path calibration, detector mounting panel 8-3 pass through screw fixed mounting in the U-shaped inslot in detector lower plate 8-2 upper portion, detector mounting panel 8-3 pass through the U-shaped inslot horizontal displacement of detector lower plate 8-2 about location and carry out the light path calibration, infrared detector 8-4 pass through screw fixed mounting at detector mounting panel 8-3 upper surface.
The optical filter wheel base plate 7-1 of the optical filter wheel lens assembly 7 is fixedly arranged at the left part of the upper end surface of the base plate 6 through a screw, the detector base 8-1 of the detector assembly 8 is fixedly arranged at the right part of the upper end surface of the base plate 6 through a screw, and the focal plane of the infrared detector 8-4 of the detector assembly 8 is overlapped with the imaging light path focal plane of the optical lens 7-10 of the optical filter wheel lens assembly 7; the power supply mounting plate 9 is fixedly connected with the base plate 6 through screws, the power supply circuit board 10 is fixedly connected with the power supply mounting plate 9 through screws, and the heat conducting rubber sheet 11 is fixedly arranged on the power supply module protruding from the power supply circuit board 10 through adhesion; the first control board bracket 13 is fixedly connected with the base plate 6 through a screw and is arranged on the front side of the detector assembly 8, the second control board bracket 14 is fixedly connected with the base plate 6 through a screw and is arranged on the rear side of the detector assembly 8, and the control circuit board 12 is fixedly connected with the first control board bracket 13 and the upper end face of the second control board bracket 14 through a screw; the lower part of the assembly shell 1 is sleeved around the base plate 6 and fixedly mounted through screws, the upper cover plate 2 is fixedly mounted on the upper side of the assembly shell 1 through screws, the cover plate through holes 1-3 of the assembly shell 1 are sealed, and when the upper cover plate 2 is removed, the control circuit board 12 can be debugged and maintained through the cover plate through holes 1-3; the heat dissipation cover plate 3 is fixedly arranged at the right part of the front side of the component shell 1 through screws to seal the heat dissipation through holes 1-2 of the component shell 1, meanwhile, the heat dissipation cover plate 3 compresses the heat conduction rubber sheet 11, and heat generated when the power supply module protruding from the power supply circuit board 10 works is conducted to the heat dissipation cover plate 3 and the component shell 1 through contact for heat dissipation; the circular electric connector 4 is fixedly arranged at the left part of the front side of the component shell 1 through screws, and the tail part of the circular electric connector 4 passes through the electric connector mounting holes 1-4 of the component shell 1; the lens cover plate 5 is fixedly arranged on the left side of the assembly shell 1 through screws to seal the lens groove 1-1 of the assembly shell 1, meanwhile, an O-shaped sealing ring is arranged in a through hole at the upper part of the lens cover plate 5, and a through hole at the upper part of the lens cover plate 5 is sleeved on the optical lens 7-10 lens barrel of the optical filter wheel lens assembly 7 and is connected in a sealing way through the O-shaped sealing ring.
The invention also provides an imaging method of the infrared imaging system based on the optical filter wheel rotation imaging, which comprises the following steps:
step 1, a direct current brushless motor 7-3 of the filter wheel lens assembly 7 is started, the filter turntable 7-4, the filter I7-5, the filter II 7-6, the filter III 7-7, the filter IV 7-8 and the filter pressing plate 7-9 are driven to rotate anticlockwise, the five-7-45, the first 7-41, the second 7-42, the third 7-43 and the fourth 7-44 sequentially penetrate through the detection grooves of the photoelectric switch 7-12 and circulate continuously, and when any one of the five-7-45, the first 7-41, the second 7-42, the third 7-43 and the fourth 7-44 enters the detection groove of the photoelectric switch 7-12 to completely shield the detection light of the photoelectric switch 7-12, the photoelectric switch 7-12 generates an electric signal, and six switches generated by the initial rotation of the turntable 7-4 are recorded;
step 2, recording interval time of six electric signals initially generated by the photoelectric switch 7-12 when the optical filter turntable 7-4 rotates, wherein the interval time is shortest that the position of the first baffle 7-41 entering the photoelectric switch 7-12 when the detection light of the photoelectric switch 7-12 is completely shielded in the detection groove of the optical filter turntable 7-4 is the rotation position, and the interval time of two electric signals generated when the interval time is shortest is recorded, wherein the second electric signal is the electric signal generated when the first baffle 7-41 enters the detection groove of the photoelectric switch 7-12 and completely shields the detection light of the photoelectric switch 7-12, and the control system records the position of the first baffle 7-41 entering the photoelectric switch 7-12 when the optical filter 7-4 rotates anticlockwise in a circulation through the electric signal, wherein the position of the detection light of the first baffle 7-12 in the detection groove of the photoelectric switch 7-12 is the rotation position, and the control system can identify the interval time of the first baffle 7-41, the second electric signal, and the third baffle 7-42 in the detection groove of the photoelectric switch 7-12 when the fourth baffle 7-12 rotates in the circulation through the rotation position;
step 3, the direct current brushless motor 7-3 of the filter wheel lens assembly 7 is kept to drive the filter turntable 7-4, the first filter 7-5, the second filter 7-6, the third filter 7-7, the fourth filter 7-8 and the filter pressing plate 7-9 to rotate anticlockwise, the infrared detector 8-4 of the detector assembly 8 is started to perform infrared imaging, and when the first baffle 7-41 enters a detection groove of the photoelectric switch 7-12 to completely shield detection light of the photoelectric switch 7-12, after the photoelectric switch 7-12 generates an electric signal, the infrared detector 8-4 selects a wave band to perform imaging through the third filter 7-7; when the second baffle plate 7-42 enters a detection groove of the photoelectric switch 7-12 to completely shield detection light of the photoelectric switch 7-12, after the photoelectric switch 7-12 generates an electric signal, the infrared detector 8-4 images through a wave band selected by the fourth filter 7-8; when the third baffle sheet 7-43 enters a detection groove of the photoelectric switch 7-12 to completely shield detection light of the photoelectric switch 7-12, after the photoelectric switch 7-12 generates an electric signal, the infrared detector 8-4 selects a wave band to image through the first optical filter 7-5; when the fourth baffle plate 7-44 enters a detection groove of the photoelectric switch 7-12 to completely shield detection light of the photoelectric switch 7-12, after the photoelectric switch 7-12 generates an electric signal, the infrared detector 8-4 selects a wave band to image through the second filter 7-6; in the process of circularly and anticlockwise rotating rapidly by driving the optical filter turntable 7-4, the optical filter I7-5, the optical filter II 7-6, the optical filter III 7-7, the optical filter IV 7-8 and the optical filter pressing plate 7-9 through the direct current brushless motor 7-3, the infrared detector 8-4 can sequentially circulate through the optical filter I7-5, the optical filter II 7-6, the optical filter III 7-7 and the optical filter IV 7-8 to perform identifiable high-frame frequency infrared multispectral imaging of different wave bands.
The invention has the following advantages: according to the invention, more optical filters can be arranged by changing the number of fan-shaped center angles of the fan-shaped circular ring optical filters, so that more optical filters with different wave bands can be switched, and the method has wide applicability. The invention has reasonable and compact structure, high reliability and easy manufacture, adopts the filter wheel switching mechanism to lead the infrared imaging system to have simple structure, the fan-shaped filter structure can realize the infrared multispectral imaging of the infrared imaging system with high frame frequency in the rapid rotation of the filter, greatly reduces the cost, simplifies the structural assembling and adjusting process, uses the photoelectric switch to feed back so as to lead the filter switching control in the imaging of the system to be simple, and the control method to be simple and feasible, thereby avoiding complex and complicated position feedback control.
Drawings
Fig. 1 is a general structural schematic of an embodiment of the present invention.
Fig. 2 is a schematic diagram showing the general structure of the hidden module housing 1, the upper cover plate 2, the heat dissipation cover plate 3, the circular electrical connector 4 and the lens cover plate 5 according to an embodiment of the present invention.
Fig. 3 is a rear view of an embodiment of the invention after concealing the assembly housing 1, upper cover plate 2, heat sink cover plate 3, circular electrical connector 4 and lens cover plate 5.
Fig. 4 is a schematic structural view of the module case 1 according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of the overall structure of the filter wheel lens assembly 7 according to an embodiment of the present invention.
Fig. 6 is a schematic diagram of the structure of the filter wheel chassis 7-2 of the filter wheel lens assembly 7 according to an embodiment of the present invention.
Fig. 7 is a schematic general structural view of the detector assembly 8 according to an embodiment of the present invention.
Detailed Description
The following description of a preferred embodiment of the invention is provided in conjunction with the accompanying drawings, and is mainly used for further details of the features of the invention, but is not intended to limit the scope of the invention:
referring to fig. 1, 2 and 3, the infrared imaging system based on optical filter wheel rotation imaging comprises a component shell 1, an upper cover plate 2, a heat dissipation cover plate 3, a circular electric connector 4, a lens cover plate 5, a base plate 6, an optical filter wheel lens component 7, a detector component 8, a power supply mounting plate 9, a power supply circuit board 10, a heat conducting rubber sheet 11, a control circuit board 12, a control board bracket I13 and a control board bracket II 14; the method is characterized in that:
referring to fig. 4, a module case 1 is a hollow square case structure formed by welding an aluminum alloy plate, a lens groove 1-1 is provided on the left side of the module case 1, a heat dissipation through hole 1-2 is provided on the right side of the front side, a cover plate through hole 1-3 is provided on the upper side, and an electrical connector mounting hole 1-4 is provided on the left side of the front side.
Referring to fig. 5 and 6, the filter wheel lens assembly 7 includes a filter wheel base plate 7-1, a filter wheel base frame 7-2, a brushless dc motor 7-3, a filter turntable 7-4, a filter one 7-5, a filter two 7-6, a filter three 7-7, a filter four 7-8, a filter platen 7-9, an optical lens 7-10, a photoelectric switch bracket 7-11, and a photoelectric switch 7-12; the structure is as follows: the first filter 7-5, the second filter 7-6, the third filter 7-7 and the fourth filter 7-8 are all of a sector-shaped circular ring structure, and the sector central angle is 90 degrees; the optical filter turntable 7-4 is of a disc structure, a motor shaft mounting hole is arranged in the center, a first fan-shaped circular ring mounting groove 7-46, a second fan-shaped circular ring mounting groove 7-47, a third fan-shaped circular ring mounting groove 7-48 and a fourth fan-shaped circular ring mounting groove 7-49 are distributed on the circumference of the optical filter turntable 7-4 in a four-equal distribution manner and are sequentially arranged in a clockwise direction, the bottoms of the first fan-shaped circular ring mounting groove 7-46, the second fan-shaped circular ring mounting groove 7-47, the third fan-shaped circular ring mounting groove 7-48 and the fourth fan-shaped circular ring mounting groove 7-49 are provided with optical filter mounting surfaces, a first baffle 7-41, a second baffle 7-42, a third baffle 7-43, a fourth baffle 7-44 and a fifth baffle 7-45 are sequentially arranged convex pieces in the circumferential direction of the optical filter turntable 7-4, the first baffle 7-41 is positioned in the middle of the first fan-shaped circular ring mounting groove 7-46 and the second fan-shaped circular ring mounting groove 7-47, the second baffle 7-42 is positioned in the middle of the second fan-shaped circular ring mounting groove 7-47 and the third fan-shaped circular ring mounting groove 7-48, the third baffle 7-43 is positioned in the middle of the third fan-shaped circular ring mounting groove 7-48 and the fourth fan-shaped circular ring mounting groove 7-49, the fourth baffle 7-44 is positioned in the middle of the fourth fan-shaped circular ring mounting groove 7-49 and the first fan-shaped circular ring mounting groove 7-46, and the included angle between the first baffle 7-41 and the fifth baffle 7-45 in the circumferential direction of the optical filter turntable 7-4 is 18 degrees; the optical filter wheel base frame 7-2 is fixedly arranged at the right part of the upper surface of the optical filter wheel base plate 7-1 through screws, the direct current brushless Motor 7-3 adopts DCX19S of Maxon Motor company of Switzerland, the direct current brushless Motor 7-3 is fixedly arranged at the middle part of the optical filter wheel base frame 7-2 through screws, the optical lens 7-10 is an infrared lens self-researched by Shanghai technology physical research institute of China academy of sciences, an optical imaging lens is arranged in a central hole of the optical lens 7-10, and the optical lens 7-10 is fixedly arranged at the upper part of the optical filter wheel base frame 7-2 through screws; the motor shaft mounting hole of the optical filter turntable 7-4 is sleeved on the output shaft of the DC brushless motor 7-3 and fixedly connected through a set screw, the optical filter I7-5 is mounted in the first 7-46 grooves of the fan-shaped circular ring mounting groove, the optical filter II 7-6 is mounted in the second 7-47 grooves of the fan-shaped circular ring mounting groove, the optical filter III 7-7 is mounted in the third 7-48 grooves of the fan-shaped circular ring mounting groove, the optical filter IV 7-8 is mounted in the fourth 7-49 grooves of the fan-shaped circular ring mounting groove, the optical filter pressing plate 7-9 is fixedly mounted on the front end face of the optical filter turntable 7-4 through a screw, and meanwhile the optical filter pressing plate 7-9 tightly fixes the optical filter I7-5, the optical filter II 7-6, the optical filter III 7-7 and the optical filter IV 7-8; the photoelectric switch bracket 7-11 is fixedly arranged at the left part of the upper surface of the optical filter wheel base plate 7-1 through a screw, the photoelectric switch 7-12 adopts GK152 of Taiwan Yiguang company, and the photoelectric switch 7-12 is fixedly arranged on the front end surface of the photoelectric switch bracket 7-11 through a screw; when the brushless DC motor 7-3 is started to drive the optical filter turntable 7-4 to rotate anticlockwise, a system imaging light path imaged by the optical lens 7-10 sequentially circulates through the first optical filter 7-5, the second optical filter 7-6, the third optical filter 7-7 and the fourth optical filter 7-8, and the first blocking sheet 7-41, the second blocking sheet 7-42, the third blocking sheet 7-43, the fourth blocking sheet 7-44 and the fifth blocking sheet 7-45 sequentially also circulate through the detection groove of the photoelectric switch 7-12, and when any one of the first blocking sheet 7-41, the second blocking sheet 7-42, the third blocking sheet 7-43, the fourth blocking sheet 7-44 and the fifth blocking sheet 7-45 enters the detection groove of the photoelectric switch 7-12 to completely block the detection light of the photoelectric switch 7-12, the photoelectric switch 7-12 generates an electric signal.
Referring to fig. 7, the detector assembly 8 includes a detector base 8-1, a detector lower plate 8-2, a detector mounting plate 8-3, and an infrared detector 8-4; the structure is as follows: the upper surface of the detector base 8-1 is provided with an optical calibration boss, the bottom surface of the detector lower base plate 8-2 is fixedly connected with the upper surface of the detector base 8-1 through bolts, the detector lower base plate 8-2 is horizontally moved back and forth through the optical calibration boss of the detector base 8-1, the detector mounting plate 8-3 is fixedly arranged in a U-shaped groove at the upper part of the detector lower base plate 8-2 through bolts, the detector mounting plate 8-3 is horizontally moved back and forth through the U-shaped groove of the detector lower base plate 8-2 to perform optical calibration, the infrared detector 8-4 is a self-ground infrared detector of Shanghai technical physical research institute of China academy of sciences, and the infrared detector 8-4 is fixedly arranged on the upper surface of the detector mounting plate 8-3 through bolts.
The optical filter wheel base plate 7-1 of the optical filter wheel lens assembly 7 is fixedly arranged at the left part of the upper end surface of the base plate 6 through a screw, the detector base 8-1 of the detector assembly 8 is fixedly arranged at the right part of the upper end surface of the base plate 6 through a screw, and the focal plane of the infrared detector 8-4 of the detector assembly 8 is overlapped with the imaging light path focal plane of the optical lens 7-10 of the optical filter wheel lens assembly 7; the power supply mounting plate 9 is fixedly connected with the base plate 6 through screws, the power supply circuit board 10 is fixedly connected with the power supply mounting plate 9 through screws, and the heat conducting rubber sheet 11 is mounted on the power supply module protruding from the power supply circuit board 10 through glue; the first control board bracket 13 is fixedly connected with the base plate 6 through a screw, and is arranged on the front side of the detector assembly 8, the second control board bracket 14 is fixedly connected with the base plate 6 through a screw, is arranged on the rear side of the detector assembly 8, and the control circuit board 12 is fixedly connected with the first control board bracket 13 and the upper end face of the second control board bracket 14 through a screw; the lower part of the assembly shell 1 is sleeved around the base plate 6 and fixedly mounted through screws, the upper cover plate 2 is fixedly mounted on the upper side of the assembly shell 1 through screws, the cover plate through holes 1-3 of the assembly shell 1 are sealed, and when the upper cover plate 2 is removed, the control circuit board 12 can be debugged and maintained through the cover plate through holes 1-3; the heat dissipation cover plate 3 is fixedly arranged at the right part of the front side of the assembly shell 1 through screws to seal the heat dissipation through holes 1-2 of the assembly shell 1, meanwhile, the heat dissipation cover plate 3 compresses the heat conduction rubber sheet 11, and heat generated when the power supply module protruding from the power supply circuit board 10 works is conducted to the heat dissipation cover plate 3 and the assembly shell 1 through contact for heat dissipation; the circular electric connector 4 is fixedly arranged at the left part of the front side of the assembly shell 1 through screws, and the tail part of the circular electric connector 4 passes through the electric connector mounting hole 1-4 of the assembly shell 1; the lens cover plate 5 is fixedly arranged on the left side of the assembly shell 1 through screws to seal the lens groove 1-1 of the assembly shell 1, meanwhile, an O-shaped sealing ring is arranged in a through hole at the upper part of the lens cover plate 5, and the through hole at the upper part of the lens cover plate 5 is sleeved on the lens barrel 7-10 of the optical lens assembly 7 and is connected with the lens barrel in a sealing way through the O-shaped sealing ring.
The invention also provides an imaging method of the infrared imaging system based on the optical filter wheel rotation imaging, which comprises the following steps:
step 1, a direct current brushless motor 7-3 of a filter wheel lens assembly 7 is started, a filter turntable 7-4, a filter I7-5, a filter II 7-6, a filter III 7-7, a filter IV 7-8 and a filter pressing plate 7-9 are driven to rotate anticlockwise, a baffle five 7-45, a baffle I7-41, a baffle II 7-42, a baffle III 7-43 and a baffle IV 7-44 sequentially pass through a detection groove of a photoelectric switch 7-12 and circulate continuously, and when any one of the baffle five 7-45, the baffle I7-41, the baffle II 7-42, the baffle III 7-43 and the baffle IV 7-44 enters the detection groove of the photoelectric switch 7-12 to completely shield detection light of the photoelectric switch 7-12, the photoelectric switch 7-12 generates an electric signal, and six electric signals generated by the photoelectric switch 7-12 initially when the filter turntable 7-4 rotates are recorded;
step 2, recording interval time of six electric signals initially generated by the photoelectric switch 7-12 when the optical filter turntable 7-4 rotates, wherein the interval time is shortest that the position of the baffle five 7-45 and the baffle one 7-41, which sequentially enters the detection groove of the photoelectric switch 7-12, is a rotation position, when the detection light of the photoelectric switch 7-12 is completely blocked, the interval time of two electric signals generated when the detection light of the photoelectric switch 7-12 is completely blocked, recording the interval time of the two electric signals with the shortest interval time, wherein the second electric signal is the electric signal generated when the baffle one 7-41 enters the detection groove of the photoelectric switch 7-12, and the control system records the electric signal generated when the detection light of the photoelectric switch 7-12 is completely blocked by the baffle one 7-41 and the baffle four 7-44 enter the detection groove of the photoelectric switch 7-12 when the photoelectric switch 7-4 is completely blocked by the electric signal;
step 3, a direct current brushless motor 7-3 of a filter wheel lens assembly 7 is kept to drive a filter turntable 7-4, a filter I7-5, a filter II 7-6, a filter III 7-7, a filter IV 7-8 and a filter pressing plate 7-9 to rotate anticlockwise, an infrared detector 8-4 of a detector assembly 8 is started to perform infrared imaging, when a baffle I7-41 enters a detection groove of a photoelectric switch 7-12 to completely shield detection light of the photoelectric switch 7-12, and after the photoelectric switch 7-12 generates an electric signal, the infrared detector 8-4 selects a wave band to perform imaging through the filter III 7-7; when the second baffle plate 7-42 enters a detection groove of the photoelectric switch 7-12 to completely shield detection light of the photoelectric switch 7-12, the infrared detector 8-4 selects a wave band to image through the fourth filter 7-8 after the photoelectric switch 7-12 generates an electric signal; when the third baffle plate 7-43 enters a detection groove of the photoelectric switch 7-12 to completely shield detection light of the photoelectric switch 7-12, after the photoelectric switch 7-12 generates an electric signal, the infrared detector 8-4 selects a wave band to image through the first filter 7-5; when the baffle sheet IV 7-44 enters a detection groove of the photoelectric switch 7-12 to completely shield detection light of the photoelectric switch 7-12, after the photoelectric switch 7-12 generates an electric signal, the infrared detector 8-4 selects a wave band to image through the optical filter II 7-6; in the process of circularly and anticlockwise rotating rapidly by driving the optical filter turntable 7-4, the optical filter I7-5, the optical filter II 7-6, the optical filter III 7-7, the optical filter IV 7-8 and the optical filter pressing plate 7-9 through the direct current brushless motor 7-3, the infrared detector 8-4 can sequentially circulate through the optical filter I7-5, the optical filter II 7-6, the optical filter III 7-7 and the optical filter IV 7-8 to perform identifiable high-frame frequency infrared multispectral imaging of different wave bands.

Claims (2)

1. The infrared imaging system based on the optical filter wheel rotation imaging comprises an assembly shell (1), an upper cover plate (2), a heat dissipation cover plate (3), a circular electric connector (4), a lens cover plate (5), a substrate (6), an optical filter wheel lens assembly (7), a detector assembly (8), a power supply mounting plate (9), a power supply circuit board (10), a heat conduction rubber sheet (11), a control circuit board (12), a control board bracket I (13) and a control board bracket II (14); the method is characterized in that:
the assembly shell (1) is of a hollow square shell structure which is welded and processed through an aluminum alloy flat plate, a lens groove (1-1) is formed in the left side of the assembly shell (1), a heat dissipation through hole (1-2) is formed in the right part of the front side, a cover plate through hole (1-3) is formed in the upper side, and an electric connector mounting hole (1-4) is formed in the left part of the front side;
the optical filter wheel lens assembly (7) comprises an optical filter wheel base plate (7-1), an optical filter wheel base frame (7-2), a direct current brushless motor (7-3), an optical filter rotary table (7-4), an optical filter I (7-5), an optical filter II (7-6), an optical filter III (7-7), an optical filter IV (7-8), an optical filter pressing plate (7-9), an optical lens (7-10), a photoelectric switch bracket (7-11) and a photoelectric switch (7-12); the structure is as follows: the first optical filter (7-5), the second optical filter (7-6), the third optical filter (7-7) and the fourth optical filter (7-8) are all of a fan-shaped circular ring structure, and the fan-shaped central angle is 90 degrees; the optical filter turntable (7-4) is of a disc structure, a motor shaft mounting hole is arranged in the center, a fan-shaped circular ring mounting groove I (7-46), a fan-shaped circular ring mounting groove II (7-47), a fan-shaped circular ring mounting groove III (7-48) and a fan-shaped circular ring mounting groove IV (7-49) are uniformly distributed on the circumference of the optical filter turntable (7-4) in a four-equally-divided mode and are sequentially arranged in a clockwise direction, the fan-shaped circular ring mounting groove I (7-46), the fan-shaped circular ring mounting groove II (7-47), the fan-shaped circular ring mounting groove III (7-48) and the fan-shaped circular ring mounting groove IV (7-49) are provided with optical filters on the bottom surfaces, the first baffle (7-41), the second baffle (7-42), the third baffle (7-43), the fourth baffle (7-44) and the fifth baffle (7-45) are lugs which are sequentially arranged clockwise in the circumferential direction of the optical filter turntable (7-4), the first baffle (7-41) is arranged in the fan-shaped circular ring mounting groove I (7-46) and the fan-shaped circular ring mounting groove II (7-47) are arranged at the middle position of the fan-shaped circular ring mounting groove II (7-47), the third baffle plate (7-43) is arranged at the middle position of the third fan-shaped circular ring mounting groove (7-48) and the fourth fan-shaped circular ring mounting groove (7-49), the fourth baffle plate (7-44) is arranged at the middle position of the fourth fan-shaped circular ring mounting groove (7-49) and the first fan-shaped circular ring mounting groove (7-46), and the included angle between the first baffle plate (7-41) and the fifth baffle plate (7-45) is 16-20 degrees in the circumferential direction of the optical filter turntable (7-4); the optical filter wheel base frame (7-2) is fixedly arranged on the right part of the upper surface of the optical filter wheel base plate (7-1) through a screw, the direct current brushless motor (7-3) is fixedly arranged in the middle of the optical filter wheel base frame (7-2) through a screw, an optical imaging lens is arranged in a central hole of the optical lens (7-10), and the optical lens (7-10) is fixedly arranged on the upper part of the optical filter wheel base frame (7-2) through a screw; the motor shaft mounting hole of the optical filter turntable (7-4) is sleeved on the output shaft of the direct current brushless motor (7-3) and fixedly connected with the output shaft through a set screw, the optical filter I (7-5) is mounted in a fan-shaped circular ring mounting groove I (7-46), the optical filter II (7-6) is mounted in a fan-shaped circular ring mounting groove II (7-47), the optical filter III (7-7) is mounted in a fan-shaped circular ring mounting groove III (7-48), the optical filter IV (7-8) is mounted in a fan-shaped circular ring mounting groove IV (7-49), the optical filter pressing disc (7-9) is fixedly mounted on the front end face of the optical filter turntable (7-4) through a screw, and meanwhile the optical filter pressing disc (7-9) presses and fixes the optical filter I (7-5), the optical filter II (7-6), the optical filter III (7-7) and the optical filter IV (7-8). The photoelectric switch bracket (7-11) is fixedly arranged at the left part of the upper surface of the optical filter wheel base plate (7-1) through a screw, and the photoelectric switch (7-12) is fixedly arranged on the front end surface of the photoelectric switch bracket (7-11) through a screw; when the direct current brushless motor (7-3) is started to drive the optical filter turntable (7-4) to rotate anticlockwise, a system imaging light path imaged by the optical lens (7-10) sequentially circulates through the optical filter I (7-5), the optical filter II (7-6), the optical filter III (7-7) and the optical filter IV (7-8), and the detection light of the photoelectric switch (7-12) is completely shielded by the first baffle (7-41), the second baffle (7-42), the third baffle (7-43), the fourth baffle (7-44) and the fifth baffle (7-45) through the detection grooves of the photoelectric switch (7-12), so that the photoelectric switch (7-12) generates an electric signal when the detection light of the photoelectric switch (7-12) is completely shielded by the first baffle (7-41), the second baffle (7-42), the third baffle (7-43), the fourth baffle (7-45);
the detector assembly (8) comprises a detector base (8-1), a detector lower bottom plate (8-2), a detector mounting plate (8-3) and an infrared detector (8-4); the structure is as follows: the detector comprises a detector base (8-1), a detector mounting plate (8-3) and an infrared detector (8-4), wherein the upper surface of the detector base (8-1) is provided with an optical correction boss, the bottom surface of the detector lower plate (8-2) is fixedly connected with the upper surface of the detector base (8-1) through a screw, the detector lower plate (8-2) is horizontally moved forwards and backwards through the left and right positioning of the optical correction boss of the detector base (8-1), the detector mounting plate (8-3) is fixedly arranged in a U-shaped groove at the upper part of the detector lower plate (8-2) through the screw, and the detector mounting plate (8-3) is horizontally moved forwards and backwards through the U-shaped groove of the detector lower plate (8-2) to perform optical path correction;
the optical filter wheel base plate (7-1) of the optical filter wheel lens assembly (7) is fixedly arranged at the left part of the upper end surface of the base plate (6) through a screw, the detector base (8-1) of the detector assembly (8) is fixedly arranged at the right part of the upper end surface of the base plate (6) through a screw, and the focal plane of the infrared detector (8-4) of the detector assembly (8) is overlapped with the imaging light path focal plane of the optical lens (7-10) of the optical filter wheel lens assembly (7); the power supply mounting plate (9) is fixedly connected with the base plate (6) through screws, the power supply circuit board (10) is fixedly connected with the power supply mounting plate (9) through screws, and the heat conducting rubber sheet (11) is fixedly arranged on the power supply module protruding out of the power supply circuit board (10) through adhesion; the first control board support (13) is fixedly connected with the base plate (6) through a screw and is arranged on the front side of the detector assembly (8), the second control board support (14) is fixedly connected with the base plate (6) through a screw and is arranged on the rear side of the detector assembly (8), and the control circuit board (12) is fixedly connected with the first control board support (13) and the upper end face of the second control board support (14) through a screw; the lower part of the assembly shell (1) is sleeved on the periphery of the base plate (6) and fixedly installed through screws, the upper cover plate (2) is fixedly installed on the upper side of the assembly shell (1) through screws, the cover plate through holes (1-3) of the assembly shell (1) are sealed, and when the upper cover plate (2) is removed, the control circuit board (12) can be debugged and maintained through the cover plate through holes (1-3); the heat dissipation cover plate (3) is fixedly arranged at the right part of the front side of the component shell (1) through screws, heat dissipation through holes (1-2) of the component shell (1) are sealed, meanwhile, the heat dissipation cover plate (3) tightly presses the heat conduction rubber sheet (11), and heat generated when the power supply module with the protruding power supply circuit board (10) works is conducted to the heat dissipation cover plate (3) and the component shell (1) through contact for heat dissipation; the circular electric connector (4) is fixedly arranged at the left part of the front side of the assembly shell (1) through a screw, and the tail part of the circular electric connector (4) passes through the electric connector mounting hole (1-4) of the assembly shell (1); the lens cover plate (5) is fixedly arranged on the left side of the assembly shell (1) through screws, the lens groove (1-1) of the assembly shell (1) is sealed, meanwhile, an O-shaped sealing ring is arranged in a through hole at the upper part of the lens cover plate (5), and a through hole at the upper part of the lens cover plate (5) is sleeved on an optical lens (7-10) lens barrel of the optical filter wheel lens assembly (7) and is connected with the optical lens barrel through the O-shaped sealing ring in a sealing mode.
2. An imaging method of an infrared imaging system based on filter wheel rotation imaging according to claim 1, comprising the steps of:
step 1, a direct current brushless motor (7-3) of the optical filter wheel lens assembly (7) is started, the optical filter turntable (7-4), the optical filter I (7-5), the optical filter II (7-6), the optical filter III (7-7), the optical filter IV (7-8) and the optical filter pressing plate (7-9) are driven to rotate anticlockwise, the optical filter five (7-45), the optical filter I (7-41), the optical filter II (7-42), the optical filter III (7-43) and the optical filter IV (7-44) sequentially penetrate through a detection groove of the photoelectric switch (7-12) and continuously circulate, and when any one of the optical filter five (7-45), the optical filter I (7-41), the optical filter II (7-42), the optical filter III (7-43) and the optical filter IV (7-44) enters a detection groove of the photoelectric switch (7-12) to block the photoelectric switch (7-12) to completely record the photoelectric switch (7-12), and the optical filter IV (7-12) is completely rotated;
step 2, recording the interval time of six electric signals initially generated by the photoelectric switch (7-12) when the optical filter turntable (7-4) rotates, wherein the interval time is the shortest that the baffle five (7-45) and the baffle one (7-41) sequentially enter into the detection groove of the photoelectric switch (7-12) to completely shade the detection light of the photoelectric switch (7-12), recording the interval time of two electric signals generated by the photoelectric switch (7-12), and the interval time is shortest, wherein the second electric signal is the interval time of two electric signals generated when the baffle one (7-41) enters into the detection groove of the photoelectric switch (7-12) to completely shade the detection light of the photoelectric switch (7-12), and the control system records the position of the baffle one (7-41) entering into the detection groove of the photoelectric switch (7-12) when the optical filter turntable (7-4) rotates anticlockwise circularly, wherein the position of the baffle one (7-12) is a rotation position, and the zero position can be controlled by the control of the control system, the baffle one (7-41), the baffle one (7-43) and the baffle three (7-43) when the baffle one (7-41) is in a zero position, the fourth baffle sheet (7-44) sequentially circularly enters a detection groove of the photoelectric switch (7-12) to completely shade detection light of the photoelectric switch (7-12) to generate an electric signal;
step 3, a direct current brushless motor (7-3) of the filter wheel lens assembly (7) is kept to drive the filter turntable (7-4), the first filter (7-5), the second filter (7-6), the third filter (7-7), the fourth filter (7-8) and the filter pressing plate (7-9) to rotate anticlockwise, an infrared detector (8-4) of the detector assembly (8) is started to perform infrared imaging, and when the first baffle (7-41) enters a detection groove of the photoelectric switch (7-12) to completely shield detection light of the photoelectric switch (7-12), after the photoelectric switch (7-12) generates an electric signal, the infrared detector (8-4) selects a wave band to perform imaging through the third filter (7-7); when the second baffle sheet (7-42) enters a detection groove of the photoelectric switch (7-12) to completely shield detection light of the photoelectric switch (7-12), after the photoelectric switch (7-12) generates an electric signal, the infrared detector (8-4) selects a wave band to image through the fourth filter (7-8); when the third baffle sheet (7-43) enters a detection groove of the photoelectric switch (7-12) to completely shield detection light of the photoelectric switch (7-12), after the photoelectric switch (7-12) generates an electric signal, the infrared detector (8-4) selects a wave band to image through the first optical filter (7-5); when the fourth baffle plate (7-44) enters a detection groove of the photoelectric switch (7-12) to completely shield detection light of the photoelectric switch (7-12), after the photoelectric switch (7-12) generates an electric signal, the infrared detector (8-4) selects a wave band to image through the second optical filter (7-6); in the process that the direct current brushless motor (7-3) drives the optical filter turntable (7-4), the optical filter I (7-5), the optical filter II (7-6), the optical filter III (7-7), the optical filter IV (7-8) and the optical filter pressing plate (7-9) to rotate anticlockwise and rapidly, the infrared detector (8-4) can sequentially circulate through the optical filter I (7-5), the optical filter II (7-6), the optical filter III (7-7) and the optical filter IV (7-8) to select wave bands for identifiable high-frame frequency infrared multispectral imaging of different wave bands.
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