What are the types of surveillance cameras

1. night vision surveillance camera

The application of night vision function actually adopts infrared sensing technology. For example, the automobile night vision system mainly uses thermal imaging technology, also known as infrared imaging technology. The principle is that any object will emit heat, and objects with different temperatures will emit different heat. Humans, animals and moving vehicles emit more heat than their surroundings. The night vision system can collect this information, and then turn it into a visual image to clearly present the objects that could not be seen at night, so as to increase the safety of driving at night.

2. network camera

The network camera is a new generation product combining the traditional camera and network video technology. In addition to all the image capture functions of the general traditional camera and the latest network camera, the machine also has a built-in digital compression controller and a web-based operating system, so that the video data can be sent to the end users through the LAN, Internet or wireless network after being compressed and encrypted. It is difficult for outsiders in the market to distinguish what is a monitor and what is a webcam. In fact, it can be said that the webcam is also a kind of monitor, but the webcam adds the function of combining with the Internet to the traditional monitor.

3. digital camera

Digital camera refers to a video image acquisition device that can be stably and efficiently applied to the carrier site. It can directly store images on the hard disk. For example, the popular integrated camera sold on the Internet directly stores images on the SD card. Compared with ordinary cameras, digital cameras are highly comparable in terms of resolution, frame rate, requirements for light, exposure mode, etc., of which the main component is the CCD photosensitive core.

4. infrared camera

The infrared camera mainly realizes the day night conversion through the infrared filter, that is, open the filter during the day to block the infrared ray from entering the CCD, so that the CCD can only sense the visible light; Under the condition of night vision or poor illumination, the filter stops working and no longer blocks the infrared ray from entering the CCD. The infrared ray enters the lens for imaging after being reflected by the object. The power supply of the infrared camera is low. Two kinds of infrared rays are used: near infrared ray or short wave infrared ray, with a wavelength of 0.76 ~ 1.5 μ m, which penetrates deeply into human tissue, about 5 ~ 10 mm; Far infrared ray or long wave infrared ray, with a wavelength of 1.5 ~ 400 microns, is mostly absorbed by the surface skin, and the penetration depth of the tissue is less than 2 mm. Enhance night time image capture. It should be added here that the infrared ray cannot be seen by the naked eye. Generally, you can see the red light on the camera, which is a photosensitive resistor.

5. waterproof camera

Waterproof cameras are generally installed in the open air. For example, a vehicle mounted tail section is installed to form a rear-view system. After a long time of use, some blurring conditions will be mistaken for water ingress, affecting the performance. Generally, there are several cases when the camera becomes blurry, a kind of plastic lens aging at high and low temperatures. The plastic lens is aged and blurred. Secondly, there is water vapor in the camera, and the glue filling is not good. Thirdly, there is dust on the surface of the camera.

6. explosion proof camera

Explosion proof cameras are explosion-proof monitoring products, which are the cross product of the explosion-proof industry and the monitoring industry. Because conventional camera products cannot be used in high-risk flammable and explosive sites, only products with explosion-proof functions and relevant certificates issued by national authorities can be called explosion-proof cameras. Attention should be paid here to distinguish it from anti riot products. Anti riot products are anti violence, anti damage, or anti strike. These products have relatively hard shells, but do not have explosion-proof electrical performance and certification. These are two products with very different properties.