Infrared waterproof camera is a CCTV surveillance camera that integrates cameras, rain cover, infrared LED lights and other components. Its basic principle for achieving night vision is to use an ordinary camera equipped with an aperture CCD to sense the spectral characteristics of an infrared light source (that is, visible light and infrared light can be felt), with an additional LED infrared lamp as an "illumination source" at night or in micro Imaging under light conditions.
Infrared waterproof camera purchase Note (a) choose to choose the infrared light irradiation distance to leave room 1. Given the camera minimum illumination, but also give the required value of the aperture F, and zoom lens generally only gives 1: The maximum value of F, that is, the minimum value of the aperture F (the maximum value of the actual aperture size), F=f/D, then D is a fixed value. When the focal length f is increased by 10 times, F becomes large (that is, the actual size of the aperture). Become small). Luminous flux will be greatly affected.
2. When using an auto iris lens, automatic gain control, or automatic electronic shutter camera, the lens aperture F value also changes. For example, if there is a scene near the camera, the light is reflected back to the camera, or there is a light near the camera. At this time, the camera's sensitivity will be reduced, the size of the auto iris will be turned down, and the light flux will be greatly affected.
3. The minimum illumination given by the camera. What is the minimum illumination concept here? The video signal produced by the camera is nominally 1V with a standard value of 0.7V, while the video signal with the lowest illumination is 1/3-1/2 standard. Therefore, the image of the camera at the lowest illumination level will never be "like white."
4. The protective cover also affects the effect of the infrared lamp. In the infrared light transmission process, through different media, the transmittance and reflectance are also different. Different window glasses, especially automatic defrosting coated glass, have different attenuation of infrared light.
With the rapid development of the infrared night vision system of infrared waterproof cameras, infrared lamp production and supply manufacturers will also increase, but the red light products are not as easy as some people think, but also have different conditions in terms of technology, testing equipment and equipment, and hope that users Too much to compare, choose carefully. The infrared light waterproof camera infrared light should be read carefully for the user first, especially for the personal equipment safety precautions. Check whether the supporting aspects mentioned in the previous section meet the requirements. Whether the influencing factors that should be taken into consideration should be taken into consideration, if not meet the requirements, the equipment used can be adjusted in time.
The user should not arbitrarily increase the power supply voltage, because the infrared waterproof camera infrared light is designed to take into full consideration of its irradiance, taking into account its safety and reliability. Raising the power supply voltage may cause the infrared lamp to be burned, and it is even more desirable not to tamper with the infrared lamp. If this is done, the manufacturer may no longer be responsible for maintenance. If there is a problem with the IR waterproof camera infrared light, contact the manufacturer or supplier.
5. The sharpness of the image produced by the camera at the lowest illumination is measured by a television signal test card. The black and white stripes require a black reflectance of approximately 0% and a white reflectance of greater than 89.9%. Sometimes we do not have such conditions when we observe on the scene. For example, the reflectivity of leaves and grass is very low, and the contrast is very small, so it is not easy to obtain clear images.
(b) The most important issue in the selection of infrared lamps is the completeness of the sets of infrared lamps and cameras, lenses, protective covers, and power supplies. In the design of the program, all equipment was comprehensively considered and designed, and it was considered as an infrared low-light night vision monitoring system project. Some people think about purchasing infrared light after they have bought a camera, lens, protective cover, or even power supply. This is not true. When considering the completeness, special attention should be paid to the following issues.
1. Dimensional Requirements for IR Waterproof Cameras <br><br><br><br><br><br><br><br><br><br><br><br><br><br> Requirements for IR Waterproof Cameras <br> The light flux is large, the camera size is small, and the received light flux is small. For example, the nominal effective distance of the infrared light is tested under the 1/2" camera condition. If a 1/3" or 1/4" camera is used, the effective distance will also be affected. Certainly affected. 1/3" camera light flux is only 1/2" 44% of the camera's luminous flux
2. The size of the lens is the same as the size of the camera.
3. Camera and lens function requirements The camera has an automatic electronic shutter function, AGC automatic gain control function, the lens has an automatic iris to adapt to large changes in day and night illumination.
4. The use of black-and-white camera or special color camera CCD image sensor has a wide range of light-sensing spectrum, its photosensitive spectrum includes not only the visible light area, but also extended to the infrared area, using this feature, you can use in the night without visible light illumination, Auxiliary infrared light source illumination also enables clear imaging of the CCD image sensor. However, in order to transmit a color signal, an ordinary color camera separates green, blue, and red primary color video signals from the output signals of the CCD device, and then synthesizes the color television signals, and the photosensitive spectrum is only in the visible light region.
The selection of the most required illumination <br> <br> low-light camera when the camera is scene brightness value of the brightness of the scene being shot low enough so that the camera output video signal level is low to a certain predetermined value . When measuring this parameter, you should also specify the lens aperture F size. For example, when using an F1.2 lens, when the illuminance of the subject being photographed is as low as 0.02Lx, the amplitude of the video signal output by the camera is 50%-33% of the standard amplitude of 700mv, the minimum illumination of the camera is said to be 0.02Lx. /F1.2. Some camera manufacturers give the lowest illuminance at different apertures F. When the minimum illuminance of the camera is selected to be higher than that of the infrared lamp, the effective distance of the infrared light of the infrared waterproof camera will be affected. Users should be reminded that there are two kinds of abnormalities in the minimum illumination of camera technology performances on the market. One is that the minimum illumination of the camera manufacturers is the so-called target illumination, that is, the illuminance on the CCD image sensor. It is about 10 times lower than the illuminance of the scene; the other is that some camera manufacturers or vendors falsely report the minimum illuminance. Currently on the market more economical black and white cameras (prices in the 700 yuan, some of the minimum illumination is marked as 0.01 ~ 0.02Lx) infrared waterproof camera's actual minimum illumination is only 0.1 ~ 0.2Lx, if, the use of infrared waterproof camera infrared light The minimum illumination of the camera is required to be 0.02Lx, which will inevitably affect the effective illumination distance of the infrared lamp. However, if the camera with the minimum illumination of 0.02Lux is purchased, the price may be at least twice as high as the 0.1-0.2Lx camera. At this time, there are two options: spend more on the camera and spend less on the infrared light; spend less on the camera and spend more on the infrared light. Experience has shown that when the distance is especially long, the former is more economical.
Infrared waterproof camera purchase Note (a) choose to choose the infrared light irradiation distance to leave room 1. Given the camera minimum illumination, but also give the required value of the aperture F, and zoom lens generally only gives 1: The maximum value of F, that is, the minimum value of the aperture F (the maximum value of the actual aperture size), F=f/D, then D is a fixed value. When the focal length f is increased by 10 times, F becomes large (that is, the actual size of the aperture). Become small). Luminous flux will be greatly affected.
2. When using an auto iris lens, automatic gain control, or automatic electronic shutter camera, the lens aperture F value also changes. For example, if there is a scene near the camera, the light is reflected back to the camera, or there is a light near the camera. At this time, the camera's sensitivity will be reduced, the size of the auto iris will be turned down, and the light flux will be greatly affected.
3. The minimum illumination given by the camera. What is the minimum illumination concept here? The video signal produced by the camera is nominally 1V with a standard value of 0.7V, while the video signal with the lowest illumination is 1/3-1/2 standard. Therefore, the image of the camera at the lowest illumination level will never be "like white."
4. The protective cover also affects the effect of the infrared lamp. In the infrared light transmission process, through different media, the transmittance and reflectance are also different. Different window glasses, especially automatic defrosting coated glass, have different attenuation of infrared light.
With the rapid development of the infrared night vision system of infrared waterproof cameras, infrared lamp production and supply manufacturers will also increase, but the red light products are not as easy as some people think, but also have different conditions in terms of technology, testing equipment and equipment, and hope that users Too much to compare, choose carefully. The infrared light waterproof camera infrared light should be read carefully for the user first, especially for the personal equipment safety precautions. Check whether the supporting aspects mentioned in the previous section meet the requirements. Whether the influencing factors that should be taken into consideration should be taken into consideration, if not meet the requirements, the equipment used can be adjusted in time.
The user should not arbitrarily increase the power supply voltage, because the infrared waterproof camera infrared light is designed to take into full consideration of its irradiance, taking into account its safety and reliability. Raising the power supply voltage may cause the infrared lamp to be burned, and it is even more desirable not to tamper with the infrared lamp. If this is done, the manufacturer may no longer be responsible for maintenance. If there is a problem with the IR waterproof camera infrared light, contact the manufacturer or supplier.
5. The sharpness of the image produced by the camera at the lowest illumination is measured by a television signal test card. The black and white stripes require a black reflectance of approximately 0% and a white reflectance of greater than 89.9%. Sometimes we do not have such conditions when we observe on the scene. For example, the reflectivity of leaves and grass is very low, and the contrast is very small, so it is not easy to obtain clear images.
(b) The most important issue in the selection of infrared lamps is the completeness of the sets of infrared lamps and cameras, lenses, protective covers, and power supplies. In the design of the program, all equipment was comprehensively considered and designed, and it was considered as an infrared low-light night vision monitoring system project. Some people think about purchasing infrared light after they have bought a camera, lens, protective cover, or even power supply. This is not true. When considering the completeness, special attention should be paid to the following issues.
1. Dimensional Requirements for IR Waterproof Cameras <br><br><br><br><br><br><br><br><br><br><br><br><br><br> Requirements for IR Waterproof Cameras <br> The light flux is large, the camera size is small, and the received light flux is small. For example, the nominal effective distance of the infrared light is tested under the 1/2" camera condition. If a 1/3" or 1/4" camera is used, the effective distance will also be affected. Certainly affected. 1/3" camera light flux is only 1/2" 44% of the camera's luminous flux
2. The size of the lens is the same as the size of the camera.
3. Camera and lens function requirements The camera has an automatic electronic shutter function, AGC automatic gain control function, the lens has an automatic iris to adapt to large changes in day and night illumination.
4. The use of black-and-white camera or special color camera CCD image sensor has a wide range of light-sensing spectrum, its photosensitive spectrum includes not only the visible light area, but also extended to the infrared area, using this feature, you can use in the night without visible light illumination, Auxiliary infrared light source illumination also enables clear imaging of the CCD image sensor. However, in order to transmit a color signal, an ordinary color camera separates green, blue, and red primary color video signals from the output signals of the CCD device, and then synthesizes the color television signals, and the photosensitive spectrum is only in the visible light region.
The selection of the most required illumination <br> <br> low-light camera when the camera is scene brightness value of the brightness of the scene being shot low enough so that the camera output video signal level is low to a certain predetermined value . When measuring this parameter, you should also specify the lens aperture F size. For example, when using an F1.2 lens, when the illuminance of the subject being photographed is as low as 0.02Lx, the amplitude of the video signal output by the camera is 50%-33% of the standard amplitude of 700mv, the minimum illumination of the camera is said to be 0.02Lx. /F1.2. Some camera manufacturers give the lowest illuminance at different apertures F. When the minimum illuminance of the camera is selected to be higher than that of the infrared lamp, the effective distance of the infrared light of the infrared waterproof camera will be affected. Users should be reminded that there are two kinds of abnormalities in the minimum illumination of camera technology performances on the market. One is that the minimum illumination of the camera manufacturers is the so-called target illumination, that is, the illuminance on the CCD image sensor. It is about 10 times lower than the illuminance of the scene; the other is that some camera manufacturers or vendors falsely report the minimum illuminance. Currently on the market more economical black and white cameras (prices in the 700 yuan, some of the minimum illumination is marked as 0.01 ~ 0.02Lx) infrared waterproof camera's actual minimum illumination is only 0.1 ~ 0.2Lx, if, the use of infrared waterproof camera infrared light The minimum illumination of the camera is required to be 0.02Lx, which will inevitably affect the effective illumination distance of the infrared lamp. However, if the camera with the minimum illumination of 0.02Lux is purchased, the price may be at least twice as high as the 0.1-0.2Lx camera. At this time, there are two options: spend more on the camera and spend less on the infrared light; spend less on the camera and spend more on the infrared light. Experience has shown that when the distance is especially long, the former is more economical.
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