CN108181724B - High-zoom-ratio laser lighting system for security night vision - Google Patents
High-zoom-ratio laser lighting system for security night vision Download PDFInfo
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- CN108181724B CN108181724B CN201810138984.8A CN201810138984A CN108181724B CN 108181724 B CN108181724 B CN 108181724B CN 201810138984 A CN201810138984 A CN 201810138984A CN 108181724 B CN108181724 B CN 108181724B
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- 230000004297 night vision Effects 0.000 title claims abstract description 46
- 239000004065 semiconductor Substances 0.000 claims abstract description 39
- 238000005286 illumination Methods 0.000 claims abstract description 34
- 238000003825 pressing Methods 0.000 claims abstract description 5
- 230000017525 heat dissipation Effects 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 7
- 230000003287 optical effect Effects 0.000 claims description 5
- 238000012360 testing method Methods 0.000 claims description 4
- 238000003491 array Methods 0.000 claims description 3
- 238000003384 imaging method Methods 0.000 claims description 3
- 238000002834 transmittance Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 9
- 230000008859 change Effects 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 5
- 230000008878 coupling Effects 0.000 abstract description 4
- 238000010168 coupling process Methods 0.000 abstract description 4
- 238000005859 coupling reaction Methods 0.000 abstract description 4
- 238000009434 installation Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 10
- 239000013307 optical fiber Substances 0.000 description 7
- 238000007493 shaping process Methods 0.000 description 7
- 239000005338 frosted glass Substances 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000265 homogenisation Methods 0.000 description 2
- 230000005499 meniscus Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000191 radiation effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/48—Laser speckle optics
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0933—Systems for active beam shaping by rapid movement of an element
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/095—Refractive optical elements
- G02B27/0955—Lenses
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
- H01S5/042—Electrical excitation ; Circuits therefor
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/10—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region
- H01S5/18—Surface-emitting [SE] lasers, e.g. having both horizontal and vertical cavities
- H01S5/183—Surface-emitting [SE] lasers, e.g. having both horizontal and vertical cavities having only vertical cavities, e.g. vertical cavity surface-emitting lasers [VCSEL]
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Electromagnetism (AREA)
- Semiconductor Lasers (AREA)
- Studio Devices (AREA)
Abstract
The invention relates to a high-zoom-ratio laser lighting system for security and night vision, which belongs to the technical field of laser lighting and comprises a vertical cavity area array semiconductor laser, a heat radiating device, a high-zoom-ratio angle changing device and a control board, wherein the high-zoom-ratio angle changing device comprises a lens barrel, an angle changing group, a fixed group, a first guide rod, a second guide rod, a first lens fixing frame, a second lens fixing frame, a thread pressing ring and a stepping motor. The invention thoroughly eliminates interference fringes and laser speckles caused by high coherence of laser due to the adoption of incoherent coupling light homogenizing technology, greatly improves the application effect of near infrared laser illumination in the field of night vision security, ensures that illumination spots are more uniform, and ensures that images shot by a night vision shooting system are clearer. The high-zoom-ratio laser illumination system realizes continuous angle change of 1.5-70 degrees, uniform and fine illumination spots, has simple structure, high illumination efficiency, convenient installation, low cost and good safety, and fully plays the advantages of laser illumination.
Description
Technical Field
The invention relates to the technical field of laser illumination, in particular to a high-zoom-ratio laser illumination system for security night vision.
Background
With the development of night vision monitoring technology, infrared laser illumination technology has been widely applied to security industry. The semiconductor lasers adopted in most of the security industry at present have the problems of large divergence angle, uneven far-field light spots, stripe distribution and the like. Therefore, such semiconductor lasers require spot shaping and homogenization when used as a light source.
At present, three methods are generally adopted for beam shaping and homogenization, the first method is a frosted glass dodging method, laser beams pass through frosted glass, and as a plurality of micro lens arrays are arranged on the surface of the frosted glass, the micro lens arrays are used for shaping and refracting the laser beams and then are overlapped in a target area, so that laser interference fringes are discretized, but the method has the problems of larger divergence angle, low light transmittance and the like; the second method is a frosted glass rotation or vibration light homogenizing method, wherein the rotation (or vibration) light homogenizing of the frosted glass improves the uniformity of illumination, but the light energy utilization rate is still low; the third method is an optical fiber transmission light homogenizing method, wherein the optical fiber transmission light homogenizing method refers to the fact that light beams are coupled into an optical fiber from an optical fiber inlet end, the light beams are subjected to multiple total reflection in the optical fiber and are transmitted forwards, the emergent light energy is relatively uniform, and still tiny laser speckles exist, the optical fiber coupling efficiency is relatively low, the energy efficiency of an optical fiber light homogenizing system is low, and the manufacturing cost is high. At present, the methods for shaping and homogenizing the light beams can not effectively solve the problems of large divergence angle and uneven far-field light spots of the side-emitting semiconductor laser, seriously influence the effect of laser illumination, and are not beneficial to the application and popularization in the field of night vision monitoring.
Disclosure of Invention
Based on the problems of speckle on an image and non-ideal illumination effect caused by the fact that a semiconductor edge-emitting laser is adopted as a light source in the current security night vision illumination industry, the high-zoom-ratio laser illumination system for security night vision is provided.
In order to solve the problems, the invention adopts the following technical scheme:
the high-zoom-ratio laser lighting system for security night vision comprises a vertical cavity area array semiconductor laser, a heat radiating device, a high-zoom-ratio angle changing device and a control board, wherein the high-zoom-ratio angle changing device comprises a lens barrel, an angle changing group, a fixed group, a first guide rod, a second guide rod, a first lens fixing frame, a second lens fixing frame, a thread pressing ring and a stepping motor;
the heat dissipation device is connected with the lens barrel;
the vertical cavity area array semiconductor laser is connected with the heat dissipation device;
the angle-changing group and the fixed group are sequentially arranged in the laser emitting direction of the vertical cavity area array semiconductor laser, and the central axis of the vertical cavity area array semiconductor laser is coaxial with the optical axes of the angle-changing group and the fixed group; the first guide rod and the second guide rod are parallel to each other, the first guide rod and the second guide rod are fixedly connected with the inner wall of the lens barrel, and the angle-changing group axially moves on the first guide rod and the second guide rod through the first lens fixing frame and the second lens fixing frame; the fixed group is fixed in the lens cone through a thread pressing ring;
the motor seat of the stepping motor is fixedly connected with the lens barrel, the output shaft screw rod of the stepping motor is fixedly connected with the first lens fixing frame, and the output shaft screw rod of the stepping motor drives the first lens fixing frame to slide in the lens barrel;
the control board is respectively connected with the vertical cavity area array semiconductor laser and the stepping motor, and is used for driving the vertical cavity area array semiconductor laser and the stepping motor according to a control instruction sent by the night vision camera system.
The high-zoom-ratio laser lighting system for security and protection night vision thoroughly eliminates interference fringes and laser speckles caused by high coherence of laser due to the adoption of incoherent coupling light homogenizing technology, greatly improves the application effect of near infrared laser lighting in the field of night vision security and protection, ensures that lighting spots are more uniform, ensures that images shot by a night vision camera system are clearer, and has the advantages of simple structure, high lighting efficiency, convenience in installation, low cost and good safety, and fully exerts the advantages of laser lighting.
Drawings
FIG. 1 is a first cross-sectional view of a high zoom ratio laser illumination system for security night vision according to the present invention;
FIG. 2 is a second cross-sectional view of the barrel of the high-zoom-ratio laser illumination system for security night vision according to the present invention;
FIG. 3 is a schematic diagram of a high-zoom-ratio laser illumination system for security night vision according to the present invention;
FIG. 4 is a schematic view of the high-transformation-ratio angle-changing device according to the present invention, wherein the divergence angle of the laser beam is large;
fig. 5 is a schematic view of the high-transformation-ratio angle-changing device according to the present invention, in which the divergence angle of the laser beam is small.
Detailed Description
The technical scheme of the present invention will be described in detail with reference to the accompanying drawings and examples.
In one embodiment, as shown in fig. 1 and 2, the high-zoom-ratio laser illumination system for security night vision comprises a vertical cavity area array semiconductor laser 100, a heat sink 200, a high-zoom-ratio angle-changing device and a control board, wherein the high-zoom-ratio angle-changing device comprises a lens barrel 310, an angle-changing group 320, a fixed group 330, a first lens holder 340, a second lens holder 350, a first guide rod 360, a second guide rod 370, a screw ring 380 and a stepping motor 390. Since the first guide lever 360, the second guide lever 370, and the stepping motor 390 cannot be simultaneously shown in the same sectional view, the present embodiment shows a first sectional view (fig. 1) including the stepping motor 390 and a second sectional view (fig. 2) including the first guide lever 360, the second guide lever 370, respectively, so that the technical solution of the present invention can be more clearly explained.
Specifically, in the present embodiment, the heat sink 200 is connected with the lens barrel 310, so that the structure of the present invention is compact.
The vertical cavity area array semiconductor laser 100 is connected with the heat dissipation device 200, and the heat dissipation device 200 is used for dissipating heat of the vertical cavity area array semiconductor laser 100, so that the high-transformation-ratio laser illumination system for security night vision can work normally in a high-temperature environment at 70 ℃, and damage to the laser illumination system caused by high temperature is avoided. The vertical cavity area array semiconductor laser 100 in this embodiment is formed by arranging a plurality of single-hole lasers in an array, each single-hole laser emits a beam of laser light, and the plurality of laser light beams together form the illumination light source of the present invention. In the embodiment, the vertical cavity area array semiconductor laser is used as a light source, and the high-transformation-ratio angle-changing optical system is combined, so that the laser beam emitted by the vertical cavity area array semiconductor laser is in a circular light spot, and the effect of uniform illumination is realized.
The angle-changing group 320 and the fixed group 330 are sequentially arranged in the laser emitting direction of the vertical cavity area array semiconductor laser 100, and the central axis of the vertical cavity area array semiconductor laser 100 is coaxial with the optical axes of the angle-changing group 320 and the fixed group 330; the first guide rod 360 and the second guide rod 370 are parallel to each other, and the first guide rod 360 and the second guide rod 370 are fixedly connected with the inner wall of the lens barrel 310, the variable angle group 320 is fixed by the first lens fixing frame 340 and the second lens fixing frame 350, and the first guide rod 360 and the second guide rod 370 limit the first lens fixing frame 340 and the second lens fixing frame 350, so that the variable angle group 320 can move along the axial direction at the first guide rod 360 and the second guide rod 370 through the first lens fixing frame 340 and the second lens fixing frame 350; the screw press 380 is matched with the lens barrel 310 to achieve a fixing effect on the fixing group 330. In the present invention, the variable angle group 320 is a biconcave lens, the fixing group 330 is a meniscus lens, the biconcave lens is fixed by the first lens fixing frame 340 and the second lens fixing frame 350, and the screw press ring 380 is matched with the lens barrel 310 to achieve the fixing effect on the meniscus lens.
The motor seat of the stepping motor 390 is fixedly connected with the lens barrel 310, the output shaft screw rod of the stepping motor 390 is fixedly connected with the first lens fixing frame 340, and the output shaft screw rod of the stepping motor 390 drives the first lens fixing frame 340 to slide in the lens barrel 310. The stepping motor 390 in this embodiment is a deceleration stepping motor, which is beneficial to further improving the automatic angle changing precision of the high-transformation-ratio angle changing device.
The control board is respectively connected with the vertical cavity area array semiconductor laser 100 and the stepping motor 390, and is used for driving the heat dissipation device 200, the vertical cavity area array semiconductor laser 100 and the stepping motor 390 according to a control instruction sent by the night vision camera system. The high-zoom-ratio laser lighting system for security and protection night vision and the night vision shooting system synchronously cooperate to work, when the night vision shooting system detects that the current environment light intensity is smaller than a threshold value, the night vision shooting system can send a control instruction to the laser lighting system through the wireless module, and after receiving the control instruction sent by the night vision shooting system, a control panel of the laser lighting system drives the vertical cavity area array semiconductor laser 100 and the stepping motor 390 according to the control instruction, namely, the high-zoom-ratio laser lighting system for security and protection night vision is started, so that uniform illumination is provided for the night vision shooting system. The control instruction sent by the night vision imaging system to the laser illumination system includes an instruction for setting the divergence angle of the laser beam of the high-zoom-ratio angle-changing device, that is, an instruction for setting the rotation parameters (including the rotation direction and the rotation number) of the stepper motor 390, and the size of the divergence angle of the laser beam of the high-zoom-ratio angle-changing device is determined by the field angle of the night vision imaging system.
Fig. 3 is a schematic diagram of a high-transformation-ratio laser illumination system for security and night vision according to the present embodiment, in which a vertical cavity area array semiconductor laser is used as an illumination light source, and after beam expansion, shaping and angle transformation adjustment are performed on the outgoing laser of the vertical cavity area array semiconductor laser, the outgoing laser is projected onto an illuminated target surface, so as to form an illumination light spot with a uniform target surface height. In this embodiment, the laser beam emitted by the vertical cavity area array semiconductor laser 100 enters the high-transformation-ratio angle-changing device, and the high-transformation-ratio angle-changing device includes a piece of angle-changing group 320, a piece of fixed group 330 and a step motor 390, and the angle-changing group 320 and the fixed group 330 perform beam expansion, shaping and angle-changing adjustment on the laser beam by adjusting the position of the angle-changing group 320, and the adjusted laser beam is projected to an illumination spot with uniform height on the illuminated target surface, and because the angle-changing group 320 is mounted with the step motor 390, the step motor 390 can drive the angle-changing group 320 to continuously move in the lens barrel 310, so that the laser beam divergence angle of the high-transformation-ratio angle-changing device can continuously change from 1.5 degrees to 70 degrees, so that the laser beam angle of the high-transformation-ratio angle-changing device has a larger variation range. Fig. 4 is a schematic view showing that the divergence angle of the laser beam of the high-transformation-ratio variable angle device is large, and fig. 5 is a schematic view showing that the divergence angle of the laser beam of the high-transformation-ratio variable angle device is small. The minimum aperture of light passing can reach 15mm when the high-zoom-ratio angle-changing device is used for collimation, so that the laser energy is homogenized, and the safety level of the laser is improved.
The high-zoom-ratio laser lighting system for security and protection night vision thoroughly eliminates interference fringes and laser speckles caused by high coherence of laser due to the adoption of incoherent coupling light homogenizing technology, greatly improves the application effect of near infrared laser lighting in the field of night vision security and protection, ensures that lighting spots are more uniform, ensures that images shot by a night vision camera system are clearer, and has the advantages of simple structure, high lighting efficiency, convenience in installation, low cost and good safety, and fully exerts the advantages of laser lighting.
As a specific embodiment, the heat sink 200 includes a fan 210 and a metal heat sink 220, and as shown in fig. 1, the vertical cavity area array semiconductor laser 100 is connected to the metal heat sink 220. In this embodiment, after the control board supplies power, the fan 210 is intelligently controlled in temperature, when the temperature reaches 45 degrees, the fan 210 is preferably a large-air-volume fan, so as to enhance the heat dissipation effect; the metal radiator 220 can adopt a physical heat conduction and radiation design so as to enable the heat radiation device 200 to achieve a good heat radiation effect; the vertical cavity area array semiconductor laser 100 is arranged on the metal radiator 220, a high-transformation-ratio angle changing device is connected with the metal radiator 220, in the high-transformation-ratio angle changing device, the stepping motor 390 drives the angle changing group 320 to continuously move relative to the vertical cavity area array semiconductor laser 100 along the optical axis direction, and continuous change of the laser beam divergence angle between the minimum value of 1.5 degrees and the maximum value of 70 degrees is realized through position adjustment of the angle changing group 320, so that continuous angle changing of a laser illumination system is realized. Experimental results show that the high-zoom-ratio laser illumination system for security night vision can thoroughly eliminate laser interference fringes and laser speckle phenomena and realize illumination spots with high uniformity of energy.
As a specific embodiment, the control board is further configured to receive a control signal sent by the test board, and drive the vertical cavity area array semiconductor laser 100 and the stepper motor 390 according to the control signal. The embodiment provides a mode capable of simultaneously testing the performance of the high-zoom-ratio laser lighting system for security night vision on the basis that the high-zoom-ratio laser lighting system for security night vision can automatically change angles under the control of the night vision camera system, so that the high-zoom-ratio laser lighting system for security night vision can be conveniently debugged and maintained. In this embodiment, when the test board sends a control signal to the control board, that is, when the control board receives the control signal, the control board drives the vertical cavity area array semiconductor laser 100 and the stepper motor 390 according to the control signal, so as to implement beam expansion, shaping and angle change adjustment on the laser beam, thereby achieving fast debugging and maintenance on the high-zoom-ratio laser lighting system for security and protection night vision.
As a specific implementation mode, the variable angle group 320 and the fixed group 330 are plated with an antireflection film, and the transmittance of the antireflection film is more than or equal to 99.5%, so that the energy utilization rate of the high-zoom-ratio laser lighting system for security and protection night vision is improved.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (4)
1. The high-transformation-ratio laser lighting system for security night vision is characterized by comprising a vertical cavity area array semiconductor laser (100), a heat radiating device (200), a high-transformation-ratio angle changing device and a control board, wherein the high-transformation-ratio angle changing device comprises a lens barrel (310), an angle changing group (320), a fixed group (330), a first lens fixing frame (340), a second lens fixing frame (350), a first guide rod (360), a second guide rod (370), a thread pressing ring (380) and a stepping motor (390), the variation range of the laser beam divergence angle of the high-transformation-ratio angle changing device is 1.5-70 degrees, and the minimum light-transmitting caliber of the high-transformation-ratio angle changing device is 15mm when the high-transformation-ratio angle changing device is collimated;
the heat dissipation device (200) is connected with the lens barrel (310); the heat dissipation device (200) comprises a fan (210) and a metal heat radiator (220), and the vertical cavity area array semiconductor laser (100) is connected with the metal heat radiator (220);
the vertical cavity area array semiconductor laser (100) is connected with the heat dissipation device (200);
the angle changing group (320) and the fixed group (330) are sequentially arranged in the laser emitting direction of the vertical cavity area array semiconductor laser (100), and the central axis of the vertical cavity area array semiconductor laser (100) is coaxial with the optical axes of the angle changing group (320) and the fixed group (330); the first guide rod (360) and the second guide rod (370) are parallel to each other, the first guide rod (360) and the second guide rod (370) are fixedly connected with the inner wall of the lens barrel (310), and the variable angle group (320) moves on the first guide rod (360) and the second guide rod (370) along the axial direction through the first lens fixing frame (340) and the second lens fixing frame (350); the fixed group (330) is fixed in the lens barrel (310) through a thread pressing ring (380);
the motor seat of the stepping motor (390) is fixedly connected with the lens barrel (310), the output shaft screw rod of the stepping motor (390) is fixedly connected with the first lens fixing frame (340), and the output shaft screw rod of the stepping motor (390) drives the first lens fixing frame (340) to slide in the lens barrel (310);
the control board is respectively connected with the vertical cavity area array semiconductor laser (100) and the stepping motor (390), and is used for driving the vertical cavity area array semiconductor laser (100) and the stepping motor (390) according to a control instruction sent by the night vision imaging system; the control board is also used for receiving control signals sent by the test board and driving the vertical cavity area array semiconductor laser (100) and the stepping motor (390) according to the control signals.
2. The high-zoom-ratio laser illumination system for security night vision according to claim 1, wherein,
the variable angle group (320) and the fixed group (330) are both plated with an antireflection film, and the transmittance of the antireflection film is more than or equal to 99.5%.
3. The high-zoom-ratio laser illumination system for security night vision according to claim 1, wherein,
the vertical cavity area array semiconductor laser (100) is formed by arranging a plurality of single-hole laser arrays.
4. The high-zoom-ratio laser illumination system for security night vision according to claim 1, wherein,
the stepper motor (390) is a deceleration stepper motor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810138984.8A CN108181724B (en) | 2018-02-11 | 2018-02-11 | High-zoom-ratio laser lighting system for security night vision |
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| CN201810138984.8A CN108181724B (en) | 2018-02-11 | 2018-02-11 | High-zoom-ratio laser lighting system for security night vision |
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| CN110769145A (en) * | 2019-11-28 | 2020-02-07 | 通号通信信息集团有限公司 | Zoom optical module of laser night vision camera |
| US11843221B2 (en) * | 2020-03-30 | 2023-12-12 | Namuga, Co., Ltd. | Light source module for emitting high density beam and method for controlling the same |
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