CN211576373U - Non-contact temperature measurement system - Google Patents
Non-contact temperature measurement system Download PDFInfo
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- CN211576373U CN211576373U CN202020388824.1U CN202020388824U CN211576373U CN 211576373 U CN211576373 U CN 211576373U CN 202020388824 U CN202020388824 U CN 202020388824U CN 211576373 U CN211576373 U CN 211576373U
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Abstract
The embodiment of the application provides a non-contact temperature measurement system, which comprises a movable device, a control device, an infrared camera device and a temperature reference device, wherein the control device, the infrared camera device and the temperature reference device are arranged on the movable device; the infrared camera device is used for acquiring an infrared image containing an object to be detected and the temperature reference device; and the control device is in communication connection with the infrared camera device and is used for determining the temperature of the object to be detected by utilizing the actual temperature and the infrared image of the temperature reference device. By means of the technical scheme, the temperature measurement can be more flexible.
Description
Technical Field
The application relates to the technical field of temperature measurement, in particular to a non-contact temperature measurement system.
Background
In a place where human body temperature measurement is carried out, a temperature measurement system which is provided with an infrared camera device, a temperature reference device and an upper computer at the same time is generally used for screening the overtemperature human body.
In the process of implementing the present application, the inventors found that the following problems exist in the prior art: the existing temperature measurement system is fixed for measuring temperature, and can only be deployed at a fixed position, so that when a user to be detected passes through a detection area of the temperature measurement system, temperature measurement is carried out. Thus, existing thermometry systems suffer from at least limited flexibility.
SUMMERY OF THE UTILITY MODEL
An object of the embodiment of the present application is to provide a non-contact temperature measurement system to solve the problem of limited flexibility existing in the prior art.
The embodiment of the application provides a non-contact temperature measurement system, and this temperature measurement system includes: the device comprises a movable device, and a control device, an infrared camera device and a temperature reference device which are arranged on the movable device; the infrared camera device is used for acquiring an infrared image containing an object to be detected and the temperature reference device; and the control device is in communication connection with the infrared camera device and is used for determining the temperature of the object to be detected by utilizing the actual temperature and the infrared image of the temperature reference device.
Therefore, this application embodiment is through combining infrared temperature measurement and mobile device to make temperature measurement no longer confine fixed temperature measurement to, improved temperature measurement system's flexibility.
In addition, the embodiment of the application can also avoid the contact between the detection personnel and the object to be detected, thereby ensuring the safety of the detection personnel.
In one possible embodiment, the infrared camera and the temperature reference device are fixedly arranged on the top of the movable device, and the temperature reference device is arranged in a camera area of the infrared camera.
Therefore, this application embodiment combines infrared temperature measurement and mobile device through above-mentioned mode of setting, makes the temperature measurement more nimble.
In one possible embodiment, the distance between the infrared camera and the temperature reference means is greater than 1 meter.
Therefore, the distance between the infrared camera device and the temperature reference device is set, so that the temperature measurement result is more accurate.
In one possible embodiment, the temperature reference device includes an active area for temperature reference, and the thermometry system further includes: and the reflecting device is used for reflecting the image of the whole area or partial area of the effective area to the infrared camera device.
Therefore, according to the embodiment of the application, the temperature reference device can be arranged outside the image pickup area of the infrared image pickup device through the reflection device, so that the image of the whole or partial area of the effective area of the temperature reference device can be reflected into the infrared image pickup device, and then compared with a mode of placing the whole temperature reference device into the image pickup area, the temperature reference device can remove the invalid area such as a shell in the temperature reference device, and further solve the problem that the infrared image pickup device occupied by the temperature reference device has too much view.
In one possible embodiment, the reflecting means, the infrared camera means and the temperature reference means are fixedly arranged on top of the movable means, with the temperature reference means arranged between the infrared camera means and the reflecting means, and the reflecting means is arranged within the camera area of the infrared camera means.
Therefore, under the condition that the size of the machine body of the movable device is small, the problem that the infrared temperature measurement related device cannot be installed due to limited machine body can be solved through the method.
In one possible embodiment, the thermometry system further comprises: the wireless transmission device is arranged on the movable device and is in communication connection with the control device, and the wireless transmission device is used for sending the temperature of the object to be detected to the server so that the server can send the temperature of the object to be detected to the management device conveniently.
Therefore, the temperature of the object to be detected can be sent to the management equipment side through the wireless transmission device in the embodiment of the application.
In one possible embodiment, the thermometry system further comprises: the control device is further used for comparing the preset temperature with the temperature of the object to be detected, and determining that the temperature of the object to be detected is the abnormal temperature under the condition that the temperature of the object to be detected is greater than or equal to the preset temperature.
Therefore, the embodiment of the application can directly analyze whether the temperature of the object to be detected is abnormal temperature through the control device, so that the workload of a manager can be reduced under the condition that more objects to be detected are needed.
In one possible embodiment, the thermometry system further comprises: and the control device is also used for determining the object to be detected as the following object under the condition that the temperature of the object to be detected is the abnormal temperature.
Therefore, the detection object with the abnormal temperature can be followed, and therefore management personnel can conveniently and quickly find the detection object with the abnormal temperature.
In one possible embodiment, the thermometry system further comprises: the positioning device is arranged on the movable device and is in communication connection with the control device, and the positioning device is used for acquiring the current position of the movable device; the wireless transmission device is also used for transmitting the current position of the movable device to the server so that the server can transmit the current position of the movable device to the management device.
Therefore, the position of the object to be detected can be conveniently and quickly determined by a manager through the positioning device and the wireless transmission device.
In one possible embodiment, the thermometry system further comprises: and the display device is arranged on the movable device and is in communication connection with the control device, and the display device is used for displaying the temperature of the object to be detected.
Therefore, the temperature of the object to be detected can be directly displayed through the display device, and different requirements of users can be met.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
FIG. 1 is a schematic diagram of a non-contact thermometry system according to an embodiment of the present disclosure;
FIG. 2 is a schematic structural diagram of a non-contact temperature measurement system according to an embodiment of the present disclosure;
fig. 3 shows a schematic structural diagram of another non-contact temperature measurement system provided in the embodiment of the present application.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "front side", "rear side" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation and be operated, and thus, should not be construed as limiting the present invention. In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
At present, because an infrared camera device and a temperature reference device (e.g., a black body, etc.) in an existing temperature measurement system are fixedly installed on an immovable device, the existing temperature measurement system has a problem of poor flexibility (or poor mobility).
In addition, since the temperature reference device can compensate the infrared image captured by the infrared camera in real time, this requires that the effective area of the temperature reference device for temperature reference is always within the imaging area of the infrared camera.
However, since the entire temperature reference device is disposed in the imaging area of the infrared imaging device, the volume of the temperature reference device is relatively large, and the effective area of the temperature reference device only occupies a part of the area of the temperature reference device, this leads to a problem that the remaining usable detection range of the infrared imaging device becomes small.
To facilitate understanding of the foregoing, the following description will be made with the temperature reference device in bold.
Specifically, a black body of model DS-2TE124-C4A has dimensions of 90mm by 100mm, an effective area of the black body has a radiation area of 40mm by 40mm, and an area ratio of the effective area of the black body is less than 20%. And, since the size of the infrared camera is generally 640 × 480 and the field of view is small, setting the entire black body in the imaging area of the infrared camera occupies the field of view of the infrared camera, which leads to a problem that the detection range of the infrared camera becomes small.
At present, in order to solve the problem of poor flexibility of the existing temperature measurement system, a tester can adopt a handheld temperature measurement device to measure the temperature of a human body. However, the temperature measurement can be realized only when the detection personnel stand beside the personnel to be detected, so that the handheld temperature measurement device has the problems of low detection efficiency and incapability of ensuring the safety of the temperature measurement personnel.
Based on this, the embodiment of the application skillfully provides a non-contact temperature measurement system, the control device, the infrared camera device and the temperature reference device are arranged on the movable device, the infrared camera device is used for collecting the infrared image containing the object to be detected and the temperature reference device, and the control device is used for determining the temperature of the object to be detected by utilizing the actual temperature and the infrared image of the temperature reference device.
Therefore, the embodiment of the application combines the infrared temperature measurement with the movable device, so that the temperature measurement is not limited to fixed temperature measurement any more, and the flexibility of a temperature measurement system is improved.
Referring to fig. 1, fig. 1 shows a schematic diagram of a non-contact temperature measurement system 100 according to an embodiment of the present disclosure. The thermometry system 100 shown in FIG. 1 includes an infrared camera 110 and a control device 120. And, the thermometry system 100 further comprises a temperature reference device (not shown) and a movable device (not shown). Wherein the temperature reference device, the infrared camera device 110 and the control device 120 are all arranged on the movable device.
It should be understood that the specific device of the temperature reference device may be set according to actual requirements, and the embodiments of the present application are not limited thereto.
For example, the temperature of the black body is relatively stable, so that the black body can be used as a temperature reference device to improve the accuracy of temperature measurement.
It should also be understood that the specific devices of the infrared camera device 110 may also be set according to actual requirements, and the embodiments of the present application are not limited thereto.
For example, the infrared camera 110 may be an infrared thermometer.
It should also be understood that the specific device of the control device 120 may also be set according to actual requirements, and the embodiment of the present application is not limited thereto.
For example, the control device 120 may be a processor.
It should also be understood that the specific device of the mobile device may be set according to actual requirements, and the embodiments of the present application are not limited thereto.
For example, the movable device may be a mobile robot.
It should also be understood that the installation positions of the temperature reference device, the infrared camera 110 and the control device 120 on the movable device may be set according to actual requirements, and the embodiment of the present application is not limited thereto.
Optionally, as shown in fig. 2, fig. 2 is a schematic structural diagram illustrating a non-contact temperature measurement system according to an embodiment of the present application. The thermometry system shown in FIG. 2 includes a mobile device 210, a temperature reference device 220, and an infrared camera 230. The temperature reference device 220 and the infrared camera 230 are fixedly arranged on the top of the movable device 210, and the temperature reference device 220 can be arranged in the camera area 240 of the infrared camera 230, so that the object 250 to be detected can stand in the camera area 240 of the infrared camera 230 for body temperature detection.
It should be understood that the distance between the temperature reference device 220 and the infrared camera 230 may be set according to actual requirements, and the embodiment of the present application is not limited thereto.
For example, the distance between the temperature reference device 220 and the infrared camera device 230 may be greater than 1 meter.
For another example, in the case where the temperature reference device 220 is a black body, the distance between the black body and the infrared camera 230 is generally set to be between 1.2 meters and 1.7 meters. That is, the embodiment of the present application only needs to ensure the distance requirement for normal installation of the black body.
It should also be understood that the temperature reference device 220 may be disposed in the imaging area 240 of the infrared imaging device 230 according to actual requirements, and the embodiment of the present application is not limited thereto.
For example, the entire temperature reference device 220 may be disposed in the imaging region 240 of the infrared imaging device 230.
Therefore, in the case that the size of the movable device is relatively large (for example, the length of the movable device is greater than 1 meter), the installation positions of the temperature reference device and the infrared camera device can be reasonably set, so that the robot can have a temperature detection function.
Optionally, the non-contact temperature measurement system 100 further includes a reflection device, and the reflection device is capable of reflecting an image of the entire effective area of the temperature reference device into the infrared camera device, and also capable of reflecting an image of a part of the effective area of the temperature reference device into the infrared camera device, and the embodiment of the present application is not limited thereto.
It should be understood that the specific device of the reflection device may be set according to actual requirements as long as the reflection device is ensured to be a device capable of reflecting infrared thermo-light, and the embodiment of the present application is not limited thereto.
For example, the reflecting means may be a smooth-surfaced metal sheet (e.g., an aluminum sheet, etc.).
It should also be understood that the installation position and the installation number of the reflection devices may also be set according to actual requirements, and the embodiments of the present application are not limited thereto.
Optionally, as shown in fig. 3, fig. 3 is a schematic structural diagram illustrating another non-contact temperature measurement system provided in the embodiment of the present application. The thermometry system shown in FIG. 3 includes a reflecting device 310, a movable device 320, a temperature reference device 330, and an infrared camera device 340. The reflecting device 310, the temperature reference device 330 and the infrared camera device 340 are fixedly arranged at the top of the movable device 320, the temperature reference device 330 is arranged between the reflecting device 310 and the infrared camera device 340, and the reflecting device 310 is arranged in the camera area 350 of the infrared camera device 340, so that the object 360 to be detected can stand in the camera area 350 of the infrared camera device 340 for body temperature detection.
It should be understood that the movable device 320 in the thermometry system shown in fig. 3 may be a movable device with a larger size, or a movable device with a smaller size (for example, the length of the movable device 320 is less than 1 meter, etc.), and the embodiments of the present application are not limited thereto.
It should also be understood that the arrangement manner of the reflection device 310 disposed in the image pickup area 350 of the infrared image pickup device 340 may also be set according to actual requirements, and the embodiment of the present application is not limited thereto.
For example, the reflecting device 310 includes a supporting rod fixedly disposed on the movable device 320, and a reflecting portion is disposed above the supporting rod. The reflection portion may be entirely provided in the imaging area 350 of the infrared imaging device 340, or may be partially provided in the imaging area 350 of the infrared imaging device 340.
It should also be understood that the distance between the reflecting device 310 and the temperature reference device 330 can be set according to actual requirements, as long as it is ensured that an image of a part of the effective area or the entire effective area of the temperature reference device 330 can be reflected into the infrared camera device 340.
Furthermore, it can be determined from the mirror image 370 of the temperature reference device that this arrangement in the present embodiment reduces the field of view occupied by the temperature reference device 330 as compared to placing the entire temperature reference device 330 within the imaging region 350.
Therefore, according to the embodiment of the application, the temperature reference device can be arranged outside the image pickup area of the infrared image pickup device through the reflection device, so that the image of the whole or partial area of the effective area of the temperature reference device can be reflected into the infrared image pickup device, and then compared with a mode of placing the whole temperature reference device into the image pickup area, the temperature reference device can remove the invalid area such as a shell in the temperature reference device, and further solve the problem that the infrared image pickup device occupied by the temperature reference device has too much view.
It should also be understood that, during the process of measuring the temperature of the object to be detected, the movable device may be in a moving state or a stopped state, and the embodiment of the present application is not limited thereto.
In order to facilitate understanding of the embodiments of the present application, the following description will be given by way of specific examples.
Specifically, the infrared camera 110 collects an infrared image including a temperature reference device and an object to be detected, and the control device 120 may further determine the temperature of the object to be detected by using the actual temperature of the temperature reference device and the infrared image.
It should be understood that the object to be detected may be a user, an animal, a device, or the like. That is to say, the object to be detected may be set according to actual requirements, and the embodiment of the present application is not limited to this.
It should also be understood that the process of determining the temperature of the object to be detected by the control device 120 using the actual temperature of the temperature reference device and the infrared image may be set according to actual requirements, and the embodiment of the present application is not limited thereto.
For example, the control device 120 may determine a first detected temperature of the temperature reference device according to the infrared image, and since the control device 120 may previously store an actual temperature of the temperature reference device, the control device 120 may calculate a temperature compensation value according to the first detected temperature and the actual temperature, and then the control device 120 may supplement the infrared image with the temperature compensation value to obtain the target image. Finally, the control device 120 may determine the temperature of the object to be detected from the target image.
For another example, the control device 120 may determine the first detected temperature of the temperature reference device and the second detected temperature of the object to be detected according to the infrared image, and since the control device 120 may previously store the actual temperature of the temperature reference device, the control device 120 may calculate the temperature compensation value according to the first detected temperature and the actual temperature. Finally, the control device 120 may calculate the temperature of the object to be detected according to the temperature compensation value and the second detected temperature.
For another example, the control device 120 may determine the temperature of the object to be detected by using the actual temperature of the temperature reference device and the infrared image, and may also use the existing method for determining the temperature.
In addition, with continued reference to fig. 1, the non-contact thermometry system 100 further comprises a wireless transmission device 130, the wireless transmission device 130 is also disposed on the mobile device, and the wireless transmission device 130 can be communicatively connected to the control device 120.
And, in case that the temperature of the object to be detected is determined, the wireless transmission device 130 may transmit the temperature of the object to be detected to the server. Subsequently, after the server receives the temperature of the object to be detected, the server may transmit the temperature of the object to be detected to the management device, so that the manager may determine the temperature of the object to be detected.
It should be understood that the specific device of the wireless transmission device 130 may be set according to actual needs, and the embodiments of the present application are not limited thereto.
For example, the wireless transmission device 130 may be a 4G wireless transmission device, a 5G wireless transmission device, or the like.
It should also be understood that the specific device of the management device may also be set according to actual requirements, and the embodiments of the present application are not limited thereto.
For example, the management device may be a management background of an area where the mobile device is located, or may be a mobile phone or the like of a detection person.
Therefore, the mobile device in the embodiment of the present application can shuttle among people to detect the body temperature of the user, and the mobile device can also detect the body temperature in a non-contact manner, so that the temperature measurement system in the embodiment of the present application can ensure the safety of the user.
And after the body temperature of the user is obtained, the body temperature of the user can be sent to the management equipment side, and then a manager can determine whether the user has fever or not according to the body temperature of the user.
In addition, it should be noted that, although the above is described in terms of whether the manager determines that the temperature of the object to be detected is an abnormal temperature, it should be understood by those skilled in the art that the temperature detection result may be obtained in other manners, and the embodiment of the present application is not limited thereto.
Alternatively, in the case where the control device 120 obtains the temperature of the object to be detected, the control device 120 may compare the preset temperature and the temperature of the object to be detected. And determining the temperature of the object to be detected as the abnormal temperature under the condition that the temperature of the object to be detected is greater than the preset temperature. Subsequently, the control device 120 may control the wireless transmission device 130 to upload the abnormal temperature to the management apparatus, so that the manager can determine the high temperature object.
It should be understood that the specific temperature of the preset temperature may be set according to actual requirements, and the embodiment of the present application is not limited thereto.
For example, the preset temperature may be 37 degrees 3.
Further, after the control device 120 determines the object to be detected of abnormal temperature (or the control device 120 receives the follow-up instruction transmitted by the manager through the wireless receiving device), the control device 120 may determine the object to be detected of abnormal temperature as the follow-up object so that the mobile robot may follow the object to be detected of abnormal temperature.
It should be understood that the following method of the mobile device may be any one of the following methods, and the embodiments of the present application are not limited thereto.
In addition, with continued reference to FIG. 1, the non-contact thermometry system 100 further comprises a positioning device 140, the positioning device 140 may be disposed on the mobile robot, and the positioning device 140 is further communicatively coupled to the control device 120.
And, the positioning device 140 acquires the current position of the movable device and transmits the current position of the movable device to the control device 120. Subsequently, the control device 120 can control the wireless transmission device 130 to transmit the current position of the mobile device to the management apparatus, so that the management personnel can know the current position of the mobile device, and can quickly find the object to be detected with abnormal temperature.
It should be understood that the specific device of the positioning device 140 may be set according to actual requirements, and the embodiments of the present application are not limited thereto.
For example, the positioning device 140 may be a positioning sensor.
In addition, it should be further noted that, although the above is described in terms of the management device side acquiring the relevant information of the object to be detected (for example, the temperature of the object to be detected, etc.), a person skilled in the art should understand that other ways may be used to make the detecting person know the relevant information of the object to be detected, and the embodiment of the present application is not limited to this.
Optionally, with continued reference to fig. 1, the non-contact thermometry system 100 further comprises a display device 150, the display device 150 may be disposed on the mobile device, and the display device 150 may be communicatively connected to the control device 120.
And, the display device 150 may be used to display the temperature of the object to be detected.
It should be understood that the specific device of the display device 150 may be set according to actual requirements, and the embodiments of the present application are not limited thereto.
For example, the display device 150 may be a 7 inch display screen.
It should also be understood that the display device 150 may display other information besides the temperature of the object to be detected, and the embodiment of the present application is not limited thereto.
For example, the display device 150 may display the current time, and may also display the weather of the current day.
In addition, it should be noted that the above non-contact temperature measurement system is only exemplary, and those skilled in the art can make various modifications, modifications or variations to the non-contact temperature measurement system within the scope of the present application.
Therefore, the control device, the infrared camera device and the temperature reference device are arranged on the movable device, the infrared image containing the object to be detected and the temperature reference device is collected through the infrared camera device, and the temperature of the object to be detected is determined by the control device through the actual temperature and the infrared image of the temperature reference device.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A non-contact thermometry system, comprising: the device comprises a movable device, and a control device, an infrared camera device and a temperature reference device which are arranged on the movable device;
the infrared camera device is used for acquiring an infrared image containing an object to be detected and the temperature reference device;
the control device is in communication connection with the infrared camera device and is used for determining the temperature of the object to be detected by using the actual temperature of the temperature reference device and the infrared image.
2. The thermometric system of claim 1, wherein the infrared camera and the temperature reference device are fixedly disposed on top of the moveable device, and the temperature reference device is disposed within a camera area of the infrared camera.
3. The thermometric system of claim 2, wherein the distance between said infrared camera and said temperature reference is greater than 1 meter.
4. The thermometry system of claim 1, wherein the temperature reference device comprises an active area for temperature reference, the thermometry system further comprising:
and the reflecting device is used for reflecting the image of the whole area or the partial area of the effective area to the infrared camera device.
5. The thermometric system of claim 4, wherein the reflecting means, the infrared camera means and the temperature reference means are fixedly disposed on top of the moveable means, and the temperature reference means is disposed between the infrared camera means and the reflecting means, and the reflecting means is disposed within a camera area of the infrared camera means.
6. The thermometry system of claim 1, further comprising:
the wireless transmission device is arranged on the movable device and is in communication connection with the control device, and the wireless transmission device is used for sending the temperature of the object to be detected to a server so that the server can send the temperature of the object to be detected to a management device.
7. The thermometry system of claim 6, further comprising:
the control device is further configured to compare a preset temperature with the temperature of the object to be detected, and determine that the temperature of the object to be detected is an abnormal temperature when the temperature of the object to be detected is greater than or equal to the preset temperature.
8. The thermometry system of claim 7, further comprising:
the control device is further configured to determine the object to be detected as a following object when the temperature of the object to be detected is the abnormal temperature.
9. The thermometry system of claim 8, further comprising:
the positioning device is arranged on the movable device and is in communication connection with the control device, and the positioning device is used for acquiring the current position of the movable device;
the wireless transmission device is further configured to send the current location of the mobile device to the server, so that the server sends the current location of the mobile device to the management device.
10. The thermometry system of claim 1, further comprising:
and the display device is arranged on the movable device and is in communication connection with the control device, and the display device is used for displaying the temperature of the object to be detected.
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| CN202020388824.1U CN211576373U (en) | 2020-03-24 | 2020-03-24 | Non-contact temperature measurement system |
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| CN202020388824.1U CN211576373U (en) | 2020-03-24 | 2020-03-24 | Non-contact temperature measurement system |
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