CN115597720A - A prevent sun burning mechanism for thermal infrared imager - Google Patents
A prevent sun burning mechanism for thermal infrared imager Download PDFInfo
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- CN115597720A CN115597720A CN202211389868.6A CN202211389868A CN115597720A CN 115597720 A CN115597720 A CN 115597720A CN 202211389868 A CN202211389868 A CN 202211389868A CN 115597720 A CN115597720 A CN 115597720A
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- infrared
- infrared detector
- light
- linear module
- light blocking
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- 230000000903 blocking effect Effects 0.000 claims abstract description 40
- 230000002265 prevention Effects 0.000 claims abstract description 16
- 238000001514 detection method Methods 0.000 claims abstract description 13
- 230000005540 biological transmission Effects 0.000 claims abstract description 9
- 230000001681 protective effect Effects 0.000 claims description 11
- 230000004888 barrier function Effects 0.000 claims 4
- 238000000034 method Methods 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 5
- 206010042496 Sunburn Diseases 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/0205—Mechanical elements; Supports for optical elements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/04—Casings
- G01J5/048—Protective parts
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/48—Thermography; Techniques using wholly visual means
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/30—Transforming light or analogous information into electric information
- H04N5/33—Transforming infrared radiation
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
A solar burn prevention mechanism for a thermal infrared imager, comprising: the shell is provided with an inner space and a light inlet window; the infrared detector is arranged in the inner space and is opposite to the light inlet window; the linear module is positioned on the side surface of the infrared detector; the light blocking strip is in transmission connection with the linear module, the width of the light blocking strip is smaller than the width of a photosensitive window of the infrared detector, when sunlight appears in a detection scene of the infrared detector, the linear module is used for driving the light blocking strip to translate so as to shield the sunlight in the detection scene, and meanwhile, infrared rays which are not shielded by the light blocking strip except the sunlight in the detection scene can be collected by the infrared detector. The invention can effectively prevent the infrared detector from being burnt by sunlight, does not influence other infrared light to irradiate the infrared detector and can normally image on the infrared focal plane, and can realize uninterrupted image acquisition of an observation target.
Description
Technical Field
The invention relates to the technical field of infrared camera shooting, in particular to a solar burn prevention mechanism for a thermal infrared imager.
Background
The infrared thermal imager utilizes the light of infrared wave band emitted or reflected by the scenery to image on an infrared focal plane through an optical system, and utilizes an infrared detector and a reading circuit to display the scenery. The infrared ray emitted by high-temperature light sources such as the sun has extremely high intensity, and can easily cause irreversible damage to the detector after being focused on the infrared detector, and the damage is generally called as 'burn', so that when the infrared thermal imager is used outdoors, the infrared thermal imager is prevented from being burnt by the sun as much as possible. In the use scene of the thermal imager, high-temperature targets such as the sun often inevitably enter the observation range of the thermal imager, and therefore, a thermal infrared imager burn prevention technology is generated.
At present, two methods for preventing sun burn are mainly used: 1. intercepting an external light source by closing an infrared shutter; 2. and devices such as a holder or a robot are utilized, and the high-intensity infrared rays are avoided through the mobile thermal imager. The method for cutting off the external light source by closing the infrared shutter blocks the whole light path by using the infrared shutter, and the infrared detector cannot acquire the external light source, so that the thermal imager cannot be normally used; and the thermal infrared imager can also see external images by using a method of moving the thermal imager to avoid high-intensity infrared rays by using a holder or a robot and the like, but the thermal imager is not the image of a target to be observed, namely the normal use of the thermal imager is influenced. Thus, both burn prevention methods of the prior art have limitations in their use.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a solar burn prevention mechanism for a thermal infrared imager, which is used for preventing the irradiation of high-intensity infrared rays by local shielding after an infrared detector detects the irradiation of the high-intensity infrared rays caused by sunlight, and simultaneously keeping the acquisition of images of an observation target so as to solve the problem of use limitation of the existing burn prevention method.
In order to achieve the above object, the present invention provides a solar burn prevention mechanism for a thermal infrared imager, comprising:
the shell is provided with an inner space and a light inlet window communicated with the inner space;
the infrared detector is arranged in the inner space and is opposite to the light inlet window so as to be used for collecting infrared rays injected through the light inlet window;
the linear module is arranged in the inner space and positioned on the side surface of the infrared detector; and
the light blocking strip is installed in the inner space and connected with the linear module in a transmission mode, the width of the light blocking strip is smaller than the width of a photosensitive window of the infrared detector, when sunlight appears in a detection scene of the infrared detector, the linear module is used for driving the light blocking strip to move horizontally to block the sunlight in the detection scene, and meanwhile infrared rays which are not blocked by the light blocking strip except the sunlight in the detection scene can be collected by the infrared detector.
As a further preferable technical scheme of the present invention, the linear module is disposed on one side of the infrared detector, the other side of the infrared detector is provided with a guide chute, one end of the light blocking strip is in transmission connection with the linear module, and the other end of the light blocking strip is disposed in the guide chute.
As a further preferable technical solution of the present invention, a protective cover of a frame structure is disposed between the infrared detector and the light blocking strip, and the protective cover is used for separating the infrared detector and the light blocking strip.
As a further preferable technical scheme of the invention, one side of the protective cover is connected with a guide cover plate, and a reserved crack between the guide cover plate and the protective cover is used for forming the guide sliding groove.
As a further preferable technical scheme of the present invention, the linear module includes a mounting seat fixedly connected to the housing, a lead screw disposed on the mounting seat, a slider disposed on the lead screw in a threaded fit, and a stepping motor drivingly connected to one end of the lead screw, the mounting seat is further provided with a guide rod parallel to the lead screw, the slider is slidably fitted to the guide rod, the stepping motor is configured to drive the lead screw to rotate and drive the slider to slide along the guide rod, and one end of the light blocking strip is fixedly connected to the slider.
As a further preferable technical scheme of the present invention, a limit module matched with the linear module is further arranged in the housing, two ends of the limit module are respectively provided with a limit switch, a limit retaining wall located between the two limit switches is formed on the light blocking strip in a protruding manner, and the two limit switches are used for limiting the stroke of the light blocking strip moving along with the slider.
As a further preferable technical scheme of the invention, a thermal imager processing circuit is arranged on the shell, and the infrared detector and the linear module are controlled by the thermal imager processing circuit.
As a further preferable technical scheme of the present invention, the housing includes a rear cover and a front cover, the rear cover and the front cover are connected and enclosed to form the internal space, the light entrance window is opened on an end surface of the front cover, an infrared shutter for closing or opening the light entrance window is further disposed on an inner side of the front cover, the infrared detector is disposed on an inner side of the rear cover and opposite to the light entrance window, and the linear module is disposed on a side surface of the infrared detector and fixedly connected to the rear cover.
The sun burn prevention mechanism for the thermal infrared imager is simple in structure, capable of achieving automatic control and convenient to use; through setting up the strip that is in the light that the width is narrower than infrared detector's photosensitive window, and by the straight line module control translation of high accuracy, after detecting sunlight (high intensity infrared ray) and shine, the straight line module can drive the strip that is in the light and carry out local sheltering from infrared detector's photosensitive window, thereby block this high intensity infrared ray and shine on infrared detector, thereby effectively prevented infrared detector from being burnt by the sunlight, do not influence simultaneously all the other infrared rays and shine on infrared detector and can normally image on the infrared focal plane, can realize uninterruptedly to observing the image acquisition of target.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic structural view of an embodiment of a solar burn prevention mechanism for a thermal infrared imager according to the present invention;
FIG. 2 is a schematic view of the internal assembly of the solar burn prevention mechanism for a thermal infrared imager according to the present invention;
FIG. 3 is a schematic view of a linear module according to the present invention;
FIG. 4 is another schematic view of the internal assembly of the solar burn prevention mechanism for a thermal infrared imager in accordance with the present invention.
In the figure: 1. the device comprises a linear module, 2, a rear cover, 3, a front cover, 4, a limiting module, 5, a light blocking strip, 6, a guide cover plate, 7, a protective cover, 8, an infrared detector, 9, a thermal imager processing circuit, 10, an infrared shutter, 11, a stepping motor, 12, a mounting seat, 13, a sliding block, 14, a screw rod, 15, a guide rod, 16, a limiting retaining wall, 17 and a limiting switch.
The objects, features and advantages of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The invention will be further described with reference to the drawings and the detailed description. In the preferred embodiments, the terms "upper", "lower", "left", "right", "middle" and "a" are used for clarity of description only, and are not used to limit the scope of the invention, and the relative relationship between the terms and the terms is not changed or modified substantially without changing the technical content of the invention.
As shown in fig. 1-4, the present invention provides a solar burn prevention mechanism for a thermal infrared imager, which is used as a part of the thermal infrared imager to provide a protection function against solar burn to assist the thermal infrared imager in acquiring infrared images, and specifically comprises: the infrared detector comprises a shell, an infrared detector 8, a linear module 1 and a light blocking strip 5, wherein the shell is used for forming a closed optical channel, the infrared detector 8 is positioned in the shell to collect infrared rays (also called infrared radiation, between visible light and microwave and electromagnetic waves in an infrared band with a wavelength range of 0.76-1000 microns) which are emitted through the optical channel, after sunlight (high-intensity infrared rays) is detected to irradiate, the linear module 1 is used for driving the light blocking strip 5 to locally shield a photosensitive window of the infrared detector 8 so as to prevent the high-intensity infrared rays from irradiating the infrared detector 8, and meanwhile, the rest infrared rays do not irradiate the infrared detector 8 and can normally form images on an infrared focal plane, so that the image acquisition of an observation target is uninterruptedly realized, namely, the infrared detector 8 is effectively prevented from being burnt by the sunlight.
Specifically, the housing is provided with an internal space, a light entrance window serving as an optical channel and communicating with the internal space, and an infrared shutter 10 for opening or closing the light entrance window; the infrared detector 8 is arranged in the inner space and is opposite to the light inlet window so as to be used for collecting infrared rays injected through the light inlet window; the linear module 1 is arranged in the inner space and positioned on the side surface of the infrared detector 8; the light blocking strip 5 is installed in the inner space and is in transmission connection with the linear module 1, the width of the light blocking strip 5 is smaller than the width of a photosensitive window of the infrared detector 8, when sunlight appears in a detection scene of the infrared detector 8, the linear module 1 is used for driving the light blocking strip 5 to transversely or longitudinally translate so as to shield the sunlight in the detection scene, and meanwhile, the infrared detector 8 can also collect the infrared rays which are not shielded except the sunlight in the detection scene.
In practical application, the width of the light blocking strip can be determined by calculation in the following way, the apparent diameter of the sun is about 0.5 degrees, the minimum width required by the theory that the light blocking strip blocks the 0.5-degree field angle in the infrared thermal imager imaging system is calculated according to the field angle of the infrared thermal imager imaging system, and the actual width of the light blocking strip is 1.2-1.5 times of the minimum width required by the theory. The width of the field angle to be blocked is calculated according to the total field angle of the thermal infrared imager imaging system, which belongs to the conventional technology in the optical field and is not illustrated herein.
The working principle of the mechanism for preventing the thermal infrared imager from being burnt by the sun is as follows:
the infrared detector 8 forms an infrared image according to the collected infrared rays, high-intensity infrared light caused by sunlight is obtained through detection of gray values of the infrared image, the irradiation position of the high-intensity infrared light on the infrared detector 8 is judged through the difference of the AD values of the infrared rays, and finally the linear module 1 is controlled to operate, so that the light blocking strip 5 moves and blocks the high-intensity infrared light of the sun, and the infrared detector 8 is prevented from being burnt. Because the light blocking strip 5 is partially blocked, the unblocked infrared rays can be normally imaged on the infrared focal plane.
It should be noted that, it belongs to the prior art to determine whether sunlight exists in the observation scene of the thermal infrared imager according to the gray value corresponding to the infrared image, and determine the position of the infrared detector 8 irradiated by the sunlight according to the intensity difference of the infrared rays collected at different positions on the infrared detector 8, and therefore, the detailed principle thereof is not described herein.
The shell is further provided with a thermal imager processing circuit 9, and the infrared detector 8 and the linear module 1 are controlled by the thermal imager processing circuit 9.
Preferably, the casing includes back lid 2 and protecgulum 3, back lid 2 with protecgulum 3 is connected and is enclosed and close and form the inner space, go into the light window and open and locate the terminal surface of protecgulum 3, infrared shutter 10 set up in the inboard of protecgulum 3, infrared detector 8 set up in the inboard of back lid 2 and with it is relative to go into the light window, straight line module 1 in infrared detector 8's side and with back lid 2 fixed connection. And the connecting structure of the rear cover 2 and the front cover 3 is adopted, so that the structure is compact, and the assembly and the disassembly are convenient. The infrared shutter 10 can close the light entrance window as required to intercept an external light source so as to be used after the light blocking strip 5 is failed, and the reliability of preventing sun burn is further improved.
In an embodiment, the linear module 1 is disposed on one side of the infrared detector 8, a guiding chute is disposed on the other side of the infrared detector 8, one end of the light blocking strip 5 is in transmission connection with the linear module 1, and the other end of the light blocking strip 5 is disposed in the guiding chute, so that the light blocking strip 5 is smoother when being parallel to each other by the guiding chute. Infrared detector 8 with be equipped with frame construction's safety cover 7 between the strip 5 that is in the light, safety cover 7 be used for with infrared detector 8 with the strip 5 that is in the light separates, and safety cover 7 primary function is the photosensitive window of protection infrared detector 8 to prevent to be scraped by the strip 5 that is in the light of removal, scrape the flower. One side of the protective cover 7 is connected with a guide cover plate 6, and the guide sliding groove is formed by the guide cover plate 6 and a reserved crack between the protective covers 7.
In another embodiment, the linear module 1 includes an installation base 12 fixedly connected to the housing, a lead screw 14 disposed on the installation base 12, a slider 13 disposed on the lead screw 14 in a threaded fit manner, and a stepping motor 11 in transmission connection with one end of the lead screw 14, the installation base 12 is further provided with a guide rod 15 parallel to the lead screw 14, the slider 13 is in sliding fit with the guide rod 15, the stepping motor 11 is configured to drive the lead screw 14 to rotate and drive the slider 13 to slide along the guide rod 15, and one end of the light blocking strip 5 is fixedly connected to the slider 13. The stepping motor 11 is adopted, and the screw rod 14 rotates to adjust the sliding block 13 to move, so that the control precision is high, the response speed is high, the light blocking strip 5 can accurately move to a specified position, and the reliability is high.
Specifically, still be equipped with in the casing with 1 complex spacing module 4 of sharp module, spacing module 4 is fixed in the inboard of protecgulum 3, spacing module 4's both ends are equipped with limit switch 17 respectively, the protruding being formed with on the strip of being in the light 5 is located two spacing barricade 16 between the limit switch 17, two limit switch 17 is used for limiting the stroke that the strip of being in the light 5 moved along with slider 13. In practical application, the limit switch 17 can be selected as a mechanical limit switch or an electronic limit switch 17 to ensure that the sliding block 13 drives the light blocking strip 5 to move within a set stroke, so that the safety and the reliability are improved.
Although specific embodiments of the present invention have been described above, it will be appreciated by those skilled in the art that these are merely examples and that many variations or modifications may be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims.
Claims (8)
1. A prevent mechanism of solar burn for thermal infrared imager, its characterized in that includes:
the shell is provided with an inner space and a light inlet window communicated with the inner space;
the infrared detector is arranged in the inner space and is opposite to the light inlet window so as to be used for collecting infrared rays injected through the light inlet window;
the linear module is arranged in the inner space and positioned on the side face of the infrared detector; and
the light blocking strip is installed in the inner space and is in transmission connection with the linear module, the width of the light blocking strip is smaller than the width of a photosensitive window of the infrared detector, when sunlight appears in a detection scene of the infrared detector, the linear module is used for driving the light blocking strip to move horizontally to block the sunlight in the detection scene, and meanwhile, infrared rays which are not blocked by the light blocking strip except the sunlight in the detection scene can be collected by the infrared detector.
2. The thermal infrared imager-based solar burn prevention mechanism as claimed in claim 1, wherein the linear module is disposed on one side of the infrared detector, a guide chute is disposed on the other side of the infrared detector, one end of the light blocking strip is in transmission connection with the linear module, and the other end of the light blocking strip is disposed in the guide chute.
3. The thermal infrared imager of claim 2, wherein a protective cover of a frame structure is disposed between the infrared detector and the light barrier, and the protective cover is used for separating the infrared detector from the light barrier.
4. The thermal infrared imager-based solar burn prevention mechanism as claimed in claim 3, wherein a guide cover plate is connected to one side of the protective cover, and a gap reserved between the guide cover plate and the protective cover is used for forming the guide chute.
5. The thermal infrared imager-based solar burn prevention mechanism as claimed in claim 1, wherein the linear module comprises a mounting base fixedly connected with the housing, a lead screw arranged on the mounting base, a slider arranged on the lead screw in a threaded fit manner, and a stepping motor in transmission connection with one end of the lead screw, the mounting base is further provided with a guide rod parallel to the lead screw, the slider is in sliding fit with the guide rod, the stepping motor is used for driving the lead screw to rotate and driving the slider to slide along the guide rod, and one end of the light blocking strip is fixedly connected with the slider.
6. The thermal infrared imager-based solar burn prevention mechanism as claimed in claim 5, wherein a limit module is further disposed in the housing and is matched with the linear module, limit switches are disposed at two ends of the limit module respectively, a limit retaining wall is formed on the light barrier strip and is located between the two limit switches, and the two limit switches are used for limiting the movement stroke of the light barrier strip along with the sliding block.
7. The thermal infrared imager-based mechanism of claim 1, wherein the housing has a thermal imager processing circuit, and the infrared detector and the linear module are controlled by the thermal imager processing circuit.
8. The mechanism of claim 1, wherein the housing comprises a rear cover and a front cover, the rear cover and the front cover are connected to form the inner space, the light entrance window is formed in an end surface of the front cover, an infrared shutter for closing or opening the light entrance window is further arranged on an inner side of the front cover, the infrared detector is arranged on an inner side of the rear cover and is opposite to the light entrance window, and the linear module is arranged on a side surface of the infrared detector and is fixedly connected with the rear cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211389868.6A CN115597720A (en) | 2022-11-08 | 2022-11-08 | A prevent sun burning mechanism for thermal infrared imager |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211389868.6A CN115597720A (en) | 2022-11-08 | 2022-11-08 | A prevent sun burning mechanism for thermal infrared imager |
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| Publication Number | Publication Date |
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| CN115597720A true CN115597720A (en) | 2023-01-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211389868.6A Pending CN115597720A (en) | 2022-11-08 | 2022-11-08 | A prevent sun burning mechanism for thermal infrared imager |
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| CN101459784A (en) * | 2007-12-14 | 2009-06-17 | 上海银晨智能识别科技有限公司 | Photographing method for making infrared camera device adapted to light |
| CN104316200A (en) * | 2014-10-30 | 2015-01-28 | 浙江雷邦光电技术有限公司 | Single lens reflex type thermal infrared imager and imaging method |
| CN105593062A (en) * | 2013-09-26 | 2016-05-18 | 株式会社小糸制作所 | Vehicular lighting fixture control system |
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| CN209148148U (en) * | 2018-12-10 | 2019-07-23 | 湖北久之洋红外系统股份有限公司 | A kind of anti-sun is burnt with non-refrigerated infrared detector component |
| CN217687539U (en) * | 2022-06-08 | 2022-10-28 | 北京安酷智芯科技有限公司 | Infrared focal plane detector test system |
-
2022
- 2022-11-08 CN CN202211389868.6A patent/CN115597720A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101459784A (en) * | 2007-12-14 | 2009-06-17 | 上海银晨智能识别科技有限公司 | Photographing method for making infrared camera device adapted to light |
| CN105593062A (en) * | 2013-09-26 | 2016-05-18 | 株式会社小糸制作所 | Vehicular lighting fixture control system |
| CN104316200A (en) * | 2014-10-30 | 2015-01-28 | 浙江雷邦光电技术有限公司 | Single lens reflex type thermal infrared imager and imaging method |
| US20180091717A1 (en) * | 2016-09-23 | 2018-03-29 | Apple Inc. | Camera shades |
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| Title |
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| 谢立勋、张明文: "智能制造技术及应用教程", vol. 1, 30 April 2021, 哈尔滨工业大学出版社, pages: 149 - 154 * |
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