What Is a Waterproof Video Camera?

The visible light that your eyes can see is arranged from long to short according to the wavelength, which are red, orange, yellow, green, cyan, blue, and purple. The wavelength range of red light is 0.62 to 0.76 m; the wavelength range of purple light is 0.38 to 0.46 m. Light with a shorter wavelength than violet light is called ultraviolet light, and light with a longer wavelength than red light is called infrared light. The human eye cannot see the infrared light. Because a digital camera uses a CCD to sense all light (visible light, infrared, ultraviolet, etc.), this causes the captured image to be very different from the image generated by our eyes only seeing visible light. In order to solve this problem, a digital camera is equipped with an infrared filter between the lens and the CCD. Its function is to block infrared rays from entering the CCD so that the CCD can only sense visible light. The images you see are consistent.

IR Waterproof Camera

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The visible light that your eyes can see is arranged from long to short according to the wavelength, which are red, orange, yellow, green, cyan, blue, and purple. The wavelength range of red light is 0.62 to 0.76 m; the wavelength range of purple light is 0.38 to 0.46 m. ratio

Pinyin : hong wai fang shui she xiang ji

English : Infrared camera

The visible light that human eyes can see is arranged from long to short according to the wavelength, which are red, orange, yellow, green, cyan, blue, and purple. The wavelength range of red light is 0.62 to 0.76 m; the wavelength range of purple light is 0.38 to 0.46 m. Light with a shorter wavelength than violet light is called ultraviolet light, and light with a longer wavelength than red light is called infrared light. The human eye cannot see the infrared light. Because a digital camera uses a CCD to sense all light (visible light, infrared, ultraviolet, etc.), this causes the captured image to be very different from the image generated by our eyes only seeing visible light. In order to solve this problem, a digital camera is equipped with an infrared filter between the lens and the CCD. Its function is to block infrared rays from entering the CCD, so that the CCD can only sense visible light, so that the image captured by the digital camera and our naked eye The images you see are consistent.

Infrared night vision is that under night vision, the digital camera will emit infrared light that people can't see with the naked eye to illuminate the object being photographed, turn off the infrared filter, no longer block infrared rays from entering the CCD, and the infrared rays are reflected by the object. Enter the lens for imaging. At this time, what we see is an image formed by infrared reflection, not an image formed by visible light reflection, that is, an image that is invisible to the naked eye in a dark environment can be captured at this time.

mostly

In the television monitoring system project, infrared lamps were rarely used in the past, but because of the increase in the crime rate in society today, infrared plays a more prominent role in night surveillance, not only in gold vaults, oil depots, armouries, book archives, cultural relics departments, prisons And other important departments, but also in general monitoring systems. Even the residential area TV monitoring project also uses infrared cameras. This shows that people's requirements for television monitoring system engineering are becoming more and more standardized and higher. 24 hours of continuous monitoring are increasingly required for important sites.

The method of achieving night vision can use conventional visible light illumination, but this method not only cannot be hidden, but also exposes the monitoring target more. Hidden night vision surveillance uses infrared camera technology. Infrared camera technology is divided into passive infrared camera technology and active infrared camera technology. Passive infrared camera technology uses the principle that any object has infrared light emission above absolute zero (-273 ° C). Due to the strong infrared light emitted by the human body and heating objects, the red light emitted by other non-heating objects is weak. Therefore, special infrared cameras can be used for night monitoring. Passive infrared camera technology is not used in night vision systems because the equipment is costly and cannot reflect the surrounding environment. Active infrared camera technology uses a special "infrared lamp" to artificially generate infrared radiation, which produces infrared light that is invisible to the human eye and can be captured by ordinary cameras, radiates "illumination" of scenes and environments, uses ordinary low-light CCD black and white cameras or uses "daylight A camera that automatically changes color to black and white at night or an "infrared low-light color camera" to feel the infrared light reflected from the surrounding environment, so as to achieve the night vision function.

Light is a

The most important issue in the selection of infrared lamps is the complete set of infrared lamps and cameras, lenses, protective covers, power supplies and so on. Most of the cameras in the market are separated from the infrared projector, so we must consider all the equipment when designing the solution. Should we choose a black and white camera with an infrared light, or a color to black and white camera? There are also considerations of installation and waterproofing. Generally speaking,

Infrared integrated cameras include finger-type infrared all-in-one cameras, fast-ball infrared all-in-one cameras, infrared integrated cameras combined with PTZ and infrared integrated cameras built into the lens.

Compared with traditional cameras, the integrated infrared camera is small and beautiful, has advantages in installation, and is more convenient. Its power, video, and control signals have direct sockets, unlike traditional cameras with troublesome wiring. The all-in-one imaging system (lens), CCD, and DSP technology patents are all held by well-known international manufacturers. Compared with traditional cameras, the all-in-one quality can be better controlled. At the same time, the integrated camera has a wide monitoring range and high cost performance. The traditional camera positioning system is not flexible enough and requires manual focusing. The biggest advantage of the integrated camera is that it has an automatic focusing function.

One of the characteristics of the integrated infrared camera is that it can achieve a good waterproof function. The outdoor type of the integrated camera has a waterproof function, and the traditional camera needs to be used in conjunction with the gimbal and protective cover to achieve the waterproof function. There are also submersible integrated cameras specially developed for underwater operations.

In addition, the integrated infrared lamp of the infrared integrated camera can automatically turn on when the illumination is below a certain value or even at night to achieve a stable imaging effect.

Infrared integrated cameras are mostly used in government projects, high-end high-rise buildings, and shopping malls, schools, hotels, hotels, lobby, etc. In addition, there are dust-proof and low-temperature, non-sparking motors specially suitable for places with high environmental requirements such as hospital operating rooms Explosion-proof products. Other professional integrated cameras, such as military, aviation, polar, underwater, biochemical environment, etc., because of different uses, have different special functions, such as anti-high voltage, anti-corrosion, anti-vibration, etc.

Common problems and solutions of infrared camera

The infrared integrated camera is very popular, the main reason is that the cost is low and the installation is convenient, but in the process of use, there are always some problems that we can't think of. The following are the problems I encountered in the production and sales of infrared waterproof cameras. ,For reference:

1. Waterproof and heat dissipation effect is not ideal:

After using it for a long time, there will be more or less soda inside (this phenomenon is mainly concentrated in the northern region). The reason for this phenomenon is mainly due to the insufficient sealing effect of the outer shell and the temperature difference when the fashion machine is not considered. When the infrared lamp starts to work, a large amount of heat is generated, and at the same time, the heat dissipation effect of the outer casing is not enough, which will greatly reduce the service life of the camera. In order to solve this problem, you can consider making the camera casing into multiple wire grooves. Conducive to heat dissipation.

2. The night vision effect is not ideal:

The main manifestation of this phenomenon is the effect of a flashlight or insufficient distance. In fact, this problem is mainly caused by the angle and function of the infrared light. The infrared light used by our infrared cameras is also called 850 infrared emission tube. The peak wavelength is 850. The angle can be selected from 5-60 degrees. The longer the distance of the hour's exposure, the more obvious the effect of the flashlight. On the contrary, the larger the angle, the less the effect of the flashlight, but the distance will be greatly reduced. To solve this problem mainly depends on what kind of effect and cost the manufacturer wants to pursue. Of course, the power and price of infrared emitting lamps are directly proportional. How many lamps do some manufacturers generally say when telling customers? How much can the distance be? But you may have overlooked a problem-the power and diameter of the infrared lamp? When the appearance and size of the infrared lamp are the same, in fact, you have no way to know the power, and the only way may be to test it in kind. From my personal experience in producing infrared cameras to solve this problem, I have adopted a multi-angle infrared lamp hybrid installation method so that resources can be fully utilized and far and near can be taken into account.

3. Insufficient color reproduction during the day

I do nt know if you have noticed that the color of the integrated infrared camera will be more or less discolored during the day. The most direct reason is the problem of the camera filter. Generally, the integrated infrared camera uses a dual lens that can pass a certain proportion of infrared light. The peak filter has the advantage of low cost, but because natural light contains more infrared components, it will interfere with color reproduction when it enters the CCD, such as green plants turning gray and so on (especially in outdoor environments with sunlight) . The use of the IPCUT dual filter effectively solves this problem. The IRCUT dual filter is composed of an infrared cut filter and a full-spectrum optical glass. When the daylight is sufficient, the infrared cut filter works and the CCD is restored. The true color is displayed. When the night light is insufficient, the infrared cut-off filter is automatically removed, and the full-spectrum optical glass starts to work, so that the CCD makes full use of all the light, thereby greatly improving the infrared performance.

4. Repeated transition of the critical point:

This is due to the fact that some cameras, whether equipped with IRCUT dual filters or dual peak filters, cannot work stably under certain complex light environments, and because most manufacturers use simple photoresistors Sensors and other methods to control the working state of the IRCUT double-peak filter, the repeated jump of its critical point can not be satisfactory. But if it is controlled by an intelligent chip, its fuzzy logic capability can effectively control the working state of the IPCUT dual filter. In other words, many manufacturers are unwilling to invest in this.