Automatic demisting system and demisting method for low-temperature and high-humidity light-passing window

Abstract

The invention discloses an automatic demisting system for a low-temperature and high-humidity light-passing window. The automatic demisting system comprises an optical window structure, a temperature dew point judgment system, a frost and fog detection system, an automatic demisting system and a control system, the optical window structure is composed of optical glass, a mirror frame and a pressing plate. The optical glass is arranged in the mirror frame and fixed through the pressing plate. An electric heating resistance wire is arranged around the ring surface of the optical glass; a hot gas bypass groove and a drainage micro groove are formed in the pressing plate; the temperature dew point judgment system is composed of an environment monitoring assembly and a dew point judgment assembly. The frost and fog detection system is composed of a visual camera, a movable mechanical arm and a water drop analysis assembly. The automatic demisting system comprises a hot air blowing device and an electric auxiliary heating assembly. Two demisting methods of electric defrosting and hot air blowing are combined, the demisting and frost resisting capacity is high, the demisting and frost resisting efficiency is high, and it can be guaranteed that the light-passing window is clean and free of fog in the limiting environments such as low temperature and high humidity.

Description

Technical Field

[0001] The invention belongs to the field of optics, and particularly relates to an automatic defog system and defog method for a low-temperature and high-humidity light-transmitting window, which can be applied to quickly remove frost and fog on the light-transmitting window. Background Art

[0002] With the development of laser detection and laser communication in extreme working conditions equipment systems, the optical window structure in the equipment system not only needs to isolate different temperature, humidity and pressure environments, but also needs to have better optical performance. However, in low temperature and high humidity environments, water vapor on the surface of the optical window is very easy to form frost and fog. When light passes through, the light is refracted by dew droplets and focused at one point, causing the laser energy to converge and heat up locally rapidly, further damaging the mirror film layer, etc. In severe cases, it can cause the optical glass to break.

[0003] Frosting of optical surfaces is a complex phase change process accompanied by heat and mass transfer. When the temperature of a cold surface in humid air is lower than the dew point temperature of the humid air, the water vapor in the humid air condenses into small droplets on the cold surface. When the temperature of the cold surface continues to drop below 0 degrees, the droplets freeze on the cold surface to form frost crystals. Therefore, in order to remove frost on the optical surface, the surface temperature must be raised to above the current ambient dew point temperature. The dew point temperature is determined by the pressure, temperature, and humidity in the current environment. Generally, the lower the ambient temperature, the higher the humidity, and the higher the pressure, the lower the dew point temperature.

[0004] There are many ways to defrost the existing system surface, such as electromagnetic field suppression, ultrasonic frost suppression, surface modification frost suppression, water defrosting, electric heating, hot air blowing, etc. The common electric heating thermal resistance wire is arranged on the surface of the glass aperture, which will interfere with the laser light transmission; the common hot air blowing method has low defrosting efficiency in low temperature environments; the remaining methods have the problem of incomplete frost suppression and are not suitable for light windows with high surface finish requirements. Therefore, finding a reasonable method for automatic and rapid removal of frost and fog on the surface of light windows is of great significance to the development of large and complex equipment. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and to provide an automatic defog system that utilizes the combined effects of hot air and electric heating, which can achieve efficient and high-quality removal of frost and fog on the glass surface, solve the problem of frost and fog on light-transmitting windows in low temperature and high humidity environments, and a method for defogging using the system.

[0006] The object of the present invention is achieved through the following technical solutions: an automatic defogging system for low-temperature and high-humidity light-transmitting windows, comprising an optical window structure, a temperature dew point determination system, a frost and fog detection system, an automatic defogging system and a control system;

[0007] The optical window structure consists of three parts: optical glass, frame and pressing plate. The optical glass is set in the frame and fixed by the pressing plate. The outer edges of the two mirror sides of the optical window glass are provided with polytetrafluoroethylene gaskets, and the annular surface of the optical glass is provided with electric thermal resistance wires. The pressing plates are all annular structures, and the edges of the pressing plates are provided with hot air bypass grooves and drainage micro grooves. The hot air bypass grooves are used to blow hot air onto the surface of the optical glass, and the drainage micro grooves are used to drain water droplets from the surface of the optical glass.

[0008] The temperature dew point determination system is composed of an environmental monitoring component and a dew point determination component; wherein the environmental monitoring component comprises an environmental temperature sensor, an environmental humidity sensor and an environmental pressure sensor installed on a pressure plate, and a mirror temperature sensor installed on the surface of the optical glass; the environmental temperature sensor, the environmental humidity sensor, the environmental pressure sensor and the mirror temperature sensor are respectively connected to the dew point determination component;

[0009] The frost and fog detection system consists of a visual camera, a mobile robotic arm, and a water drop analysis component. The visual camera is fixed at the end of the mobile robotic arm to scan the entire mirror surface of the window glass and transmit the scanned image data to the water drop analysis component.

[0010] The automatic defog system includes a hot air blowing device and an electric auxiliary heating component; the hot air blowing device includes a compressed air pump, an air filter device and an air heating device connected in sequence, and the hot air outlet of the air heating device is connected to the hot air bypass groove; the electric auxiliary heating system is connected to the electric heating resistance wire;

[0011] The dew point determination component, the water drop analysis component, the compressed air pump and the electric auxiliary heating system are all connected to the control system.

[0012] The automatic defog system also includes a user interaction interface. The temperature dew point determination system, the frost and fog detection system, and the automatic defog system are all connected to the user interaction interface, and the information generated during the defog process is displayed on the user interaction interface.

[0013] An automatic defogging method for a low-temperature and high-humidity light-transmitting window is implemented using the automatic defogging system of the present invention, and the steps of use are as follows:

[0014] Step 1: Install the optical window structure on the environmental window, and connect the temperature dew point determination system, frost and fog detection system, and automatic defog system;

[0015] Step 2: The temperature dew point determination system monitors the temperature, humidity and pressure data of the environment in real time, determines the current ambient dew point temperature, and uses the mirror temperature sensor to detect whether the mirror temperature is below the ambient dew point temperature;

[0016] Step 3: When it is detected that the mirror surface temperature is lower than the ambient dew point temperature, the automatic defog system is started to increase the mirror surface temperature to above the ambient dew point temperature and maintain it;

[0017] Step 4: Before loading the laser light source, start the frost and fog detection system to determine whether there are residual dew drops on the mirror surface. If there are residual dew drops, start the automatic defog system to blow away the surface water droplets.

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

[0019] 1. Combining the two defrosting methods of electric defrosting and hot air blowing, the defrosting and frost resistance are strong and efficient, and can ensure that the light-transmitting windows are clean and fog-free in extreme environments such as low temperature and high humidity.

[0020] 2. The entire defog process is carried out automatically without human intervention, effectively avoiding mirror damage caused by human operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the automatic demisting system of the present invention;

[0022] Figure 2 It is a structural schematic diagram of the optical window structure of the present invention;

[0023] Figure 3 It is a user interaction interface diagram;

[0024] Figure 4 This is the working flow diagram of the demisting system;

[0025] Explanation of the reference numerals: 1-optical window structure, 2-temperature dew point determination system, 3-frost and fog detection system, 4-automatic defog system, 5-optical glass, 6-mirror frame 6, 7-pressure plate, 8-polytetrafluoroethylene gasket, 9-dew point determination component, 10-user interaction interface, 11-ambient temperature sensor 11, 12-ambient humidity sensor, 13-ambient pressure sensor, 14-visual camera, 15-mobile robotic arm, 16-water droplet analysis component, 17-hot air blowing device, 18-compressed air pump, 19-air filtering device, 20-air heating device, 21-mirror temperature sensor, 22-electric thermal resistance wire, 23-hot air bypass groove, 24-drainage micro groove. DETAILED DESCRIPTION

[0026] The technical solution of the present invention is further described below in conjunction with the accompanying drawings.

[0027] like Figure 1 As shown, an automatic defog system for a low-temperature and high-humidity light-transmitting window of the present invention comprises an optical window structure 1, a temperature dew point determination system 2, a frost and fog detection system 3, an automatic defog system 4 and a control system;

[0028] like Figure 2As shown, the optical window structure consists of three parts: an optical glass 5, a lens frame 6, and a pressing plate 7, wherein the optical glass 5 is arranged in the lens frame 6 and fixed by the pressing plate 7; the outer edges of the two mirror surfaces of the optical window glass 5 are provided with polytetrafluoroethylene gaskets 8 for buffering and heat insulation, and an electric thermal resistance wire 22 is provided around the annular surface of the optical glass 5, which can quickly heat up the mirror surface; in this embodiment, the lens frame 6, the pressing plate 7 and the polytetrafluoroethylene gasket 8 are all annular structures, and the edge of the pressing plate 7 is provided with a hot air bypass groove 23 and a drainage micro groove 24, and there is a certain angle between the hot air bypass groove 23 and the mirror surface, which is used to blow hot air on the surface of the optical glass 5 at a certain angle, and the drainage micro groove 24 is used to drain water droplets on the surface of the optical glass;

[0029] The temperature dew point determination system 2 is composed of an environmental monitoring component and a dew point determination component 9; wherein the environmental monitoring component includes an environmental temperature sensor 11, an environmental humidity sensor 12 and an environmental pressure sensor 13 installed on the pressure plate, which respectively collect the temperature, humidity and pressure data in the environment in real time; and a mirror temperature sensor 21 installed on the surface of the optical glass 5, which is used to detect the mirror temperature; the environmental temperature sensor 11, the environmental humidity sensor 12, the environmental pressure sensor 13 and the mirror temperature sensor 21 are respectively connected to the dew point determination component 9; the dew point determination component 9 can feed back the current environmental dew point temperature in real time according to the collected current environmental data by learning the experimental data; the temperature measured in this embodiment is -19°C, the humidity is 30%, and the pressure is standard atmospheric pressure. The dew point determination component 9 can feed back the current environmental dew point temperature in real time according to the collected current environmental data by learning the experimental data. In the experiment, it was determined that the dew point temperature at this time was 1.85°C, while the mirror temperature at this time was -18°C, the mirror temperature was much lower than the dew point temperature, and the mirror began to frost.

[0030] The frost and fog detection system 3 is composed of a visual camera 14, a mobile mechanical arm 15, and a water drop analysis component 16; wherein the visual camera 14 is fixed at the end of the mobile mechanical arm 15 to perform an overall scan of the mirror surface of the light window glass 5, and transmit the scanned image data to the water drop analysis component 16, and the water drop analysis component 16 determines whether the frost and fog on the mirror surface is completely removed;

[0031] The automatic defog system 4 includes a hot air blowing device 17 and an electric auxiliary heating component; the hot air blowing device 17 includes a compressed air pump 18, an air filter 19 and an air heating device 20 connected in sequence, and the hot air outlet of the air heating device 20 is connected to the hot air bypass groove 23; it can control the air flow rate and air temperature sprayed into the mirror surface to ensure that the incoming air is dry and oil-free, and avoid hot air from damaging the film layer on the mirror surface. The electric auxiliary heating system is connected to the electric heating resistance wire 22 and can adjust the auxiliary heating temperature. The electric auxiliary heating system heats the mirror surface to 5°C and keeps it warm, so that the surface frost melts; the hot air blowing device is started to blow the surface dew away from the mirror surface.

[0032] The dew point determination component 9, the water drop analysis component 16, the compressed air pump 18 and the electric auxiliary heating system are all connected to the control system.

[0033] The automatic defog system further comprises a user interaction interface 10. The temperature dew point determination system 2, the frost and fog detection system 3, and the automatic defog system 4 are all connected to the user interaction interface 10. The information generated during the defog process is displayed on the user interaction interface 10. Figure 3 shown.

[0034] like Figure 4 As shown, an automatic defogging method for a low-temperature and high-humidity light-transmitting window of the present invention is implemented using the automatic defogging system of the present invention, and the steps of use are as follows:

[0035] Step 1: Install the optical window structure 1 on the environmental window, and connect the temperature dew point determination system 2, the frost and fog detection system 3, and the automatic defog system 4;

[0036] Step 2: The temperature dew point determination system 2 monitors the temperature, humidity and pressure data of the environment in real time, determines the current dew point temperature of the environment, and uses the mirror temperature sensor 21 to detect whether the mirror temperature is below the dew point temperature of the environment;

[0037] Step 3: When it is detected that the mirror surface temperature is lower than the ambient dew point temperature, the automatic demisting system 4 is started to increase the mirror surface temperature to above the ambient dew point temperature and maintain it;

[0038] Step 4: Before loading the laser light source, start the frost and fog detection system 3 to determine whether there are residual dew drops on the mirror surface. If so, start the automatic defog system to blow away the surface water droplets.

[0039] Those skilled in the art will appreciate that the embodiments described herein are intended to help readers understand the principles of the present invention, and should be understood that the protection scope of the present invention is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific variations and combinations that do not deviate from the essence of the present invention based on the technical revelations disclosed by the present invention, and these variations and combinations are still within the protection scope of the present invention.

Claims

1. An automatic defogging system for low temperature and high humidity light-transmitting windows, characterized in that: It comprises an optical window structure (1), a temperature dew point determination system (2), a frost and fog detection system (3), an automatic defog system (4) and a control system; The optical window structure is composed of three parts: an optical glass (5), a mirror frame (6), and a pressing plate (7), wherein the optical glass (5) is arranged in the mirror frame (6) and fixed by the pressing plate (7); polytetrafluoroethylene gaskets (8) are arranged on the outer edges of the two mirror surfaces of the optical window glass (5), and an electric thermal resistance wire (22) is arranged around the annular surface of the optical glass (5); the pressing plate (7) is an annular structure, and a hot air bypass groove (23) and a drainage micro groove (24) are arranged on the edge of the pressing plate (7); the hot air bypass groove (23) is used to blow hot air onto the surface of the optical glass (5), and the drainage micro groove (24) is used to drain water droplets on the surface of the optical glass; The temperature dew point determination system (2) is composed of an environment monitoring component and a dew point determination component (9); wherein the environment monitoring component comprises an environment temperature sensor (11), an environment humidity sensor (12) and an environment pressure sensor (13) installed on a pressure plate, and a mirror temperature sensor (21) installed on the surface of the optical glass (5); the environment temperature sensor (11), the environment humidity sensor (12), the environment pressure sensor (13) and the mirror temperature sensor (21) are respectively connected to the dew point determination component (9); The frost and fog detection system (3) is composed of a visual camera (14), a mobile mechanical arm (15), and a water drop analysis component (16); wherein the visual camera (14) is fixed at the end of the mobile mechanical arm (15) to perform an overall scan of the mirror surface of the light window glass (5), and transmit the scanned image data to the water drop analysis component (16); The automatic demisting system (4) comprises a hot air blowing device (17) and an electric auxiliary heating component; the hot air blowing device (17) comprises an air pressure pump (18), an air filter device (19) and an air heating device (20) which are connected in sequence, and the hot air outlet of the air heating device (20) is connected to a hot air bypass groove (23); the electric auxiliary heating system is connected to an electric heating resistance wire (22); The dew point determination component (9), the water drop analysis component (16), the compressed air pump (18) and the electric auxiliary heating system are all connected to the control system.

2. The automatic defogging system for low-temperature and high-humidity light-transmitting windows according to claim 1, characterized in that: The automatic defog system further comprises a user interaction interface (10), and the temperature dew point determination system (2), the frost and fog detection system (3), and the automatic defog system (4) are all connected to the user interaction interface (10), and information generated during the defog process is displayed on the user interaction interface (10).

3. An automatic defogging method for a low-temperature and high-humidity light-transmitting window, implemented using the automatic defogging system as claimed in claim 1 or 2, characterized in that: The steps to use are as follows: Step 1: Install the optical window structure (1) on the environmental window, and connect the temperature dew point determination system (2), the frost and fog detection system (3), and the automatic defog system (4); Step 2: The temperature dew point determination system (2) monitors the temperature, humidity and pressure data of the environment in real time, determines the current dew point temperature of the environment, and uses the mirror temperature sensor (21) to detect whether the mirror temperature is below the dew point temperature of the environment; Step 3: When it is detected that the mirror surface temperature is lower than the ambient dew point temperature, the automatic demisting system (4) is started to increase the mirror surface temperature to above the ambient dew point temperature and maintain it; Step 4: Before loading the laser light source, start the frost detection system (3) to determine whether there are residual dew drops on the mirror surface. If so, start the automatic defog system to blow away the surface water droplets.

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