Infrared and night vision surveillance products is focused on the choice of the collocation of system integrity, need to carefully consider the low as the main products and interface with night vision equipment, i.e. infrared lights and cameras, lenses, protective cover, such as power supply of complete set of considerations. In the installation and construction, the demands of must give priority to with low according with night vision surveillance systems engineering to design, to consider all the equipment in this, appear not to purchase cameras, lenses, cover, power equipment, then to consider matching between infrared projector lamp will cause equipment purchase and effect, etc. To look at the below.

The choose and buy of infrared night vision products

1, pay attention to the camera aperture size and quantity of light

Camera photosensitive component diameter size is miniaturization, currently on the market the camera aperture size from 1/1.8 "to 1/4", and the photosensitive component through light depends on the camera when matching with lens aperture size, small caliber accept less luminous flux, and vice versa. In addition, special attention should be paid to the collocation with lens principle, namely the focal length value is inversely proportional to the aperture diameter corresponding relationship, such as 4 mm aperture ratio may be pro series - 1.4, but the 50 mm and 200 mm aperture diameter may only biggest f1.8-2.2, thus can also affect the amount of light, corresponding with the infrared project will affect the imaging distance image brightness.

2, the camera must choose low illumination conditions

Camera is the minimum illumination is brightness lowest value of the landscape, and the camera manufacturer will give you the lowest illuminance of different aperture f value, also is the lowest intensity of illumination of the camera (also called sensitivity). If choose camera minimum illumination is higher than the highest intensity of illumination requirements of infrared projector lamp, what is the range of infrared lamp will be affected by the minimum intensity of illumination, the projection distance shorter or imaging range is not enough, causing the image center window around a dark bad display effect. So the camera is really low illumination of the camera on the low illumination environment monitoring is very important.

3, may be to use black and white video camera or color/black and white cameras day and night

In addition to the camera itself has low performance, because of the CCD photosensitive component sensing spectral range is very wide, induction visible and infrared spectrum, it can completely without lighting at night, auxiliary black-and-white images of infrared light to make clear. And color/black and white, day and night cameras to transmit a color signal, its output signal from CCD photosensitive components in isolated green LanGong tricolor video signal, then synthesized color television signal (color signal induction only visible spectrum). With the progress of imaging technology, which has been available digital circuit switching to achieve color/black and white, day and night cameras infrared induction degree of advantage.

4, the function of the camera and lens with requirements

Cameras are usually has the automatic electronic shutter, AES and the automatic gain control, AGC, and other functions, can assist the requirement of setting conditions to the camera at night vision, including night vision lens must have automatic aperture function requirement is tie-in, in order to do the camera automatically illumination adjustment under illumination change day and night.

5, camera power supply match requirements

Front-end equipment monitoring system of power supply to a unified design. The infrared projector lamp part must consider the infrared light and infrared LED the working current of the impact on the power supply voltage, and the length of the transmission cables will also affect the dc voltage decay. Have multiple infrared lamp is apart from the control room in the distance is large, using DC12V power supply may result in control room close clustering of infrared lamp power supply high voltage, low voltage control room far infrared lamp power supply. Combined with the power supply voltage deviation on the adjustment, may cause problems such as voltage or current impedance, the infrared lamp life expectancy and even burn out. While the voltage is too low infrared lamp of the transmitted power is insufficient, make project scope, distance and brightness are insufficient, reduces the imaging effect. So try to adopt AC24V ac power supply or provide dc power supply, it can guarantee when voltage fluctuation in AC100V - 240 v output stable dc power supply, ensure the running stability of the infrared lamp.

The anatomy of the infrared night vision camera installation issues

, transmittance and reflectance of different medium is different, so different cover glass, especially with automatic defrost glass coating layer, can cause a certain to infrared light attenuation, when construction must pay special attention to;

Aim to avoid glare, equipment installation position (such as sunlight, lighting, etc), otherwise easy to cause the phenomenon such as light or light (not the fault), will also affect the service life of the CCD.

, the camera should be avoided in the damp, dusty, extreme heat, cold, such as strong electromagnetic radiation environment;

, some infrared lamp irradiation distance parameters, only the number of power, this is a very vague concept, because the power consumption, besides into infrared light can also includes power supply heat loss, heat loss, light source, heat loss, filter glass infrared light efficiency and so on. That is, the same power of infrared shoot the light, the irradiation distance may be far;

, manufacturers continue to increase, but the product of the factory testing is not easy, and technology and testing instruments and equipment conditions are different, the user should add more, carefully read the instruction manual before installation, and pay special attention to ensure personal safety equipment considerations;

• consider is a reflection of video scene. Infrared light has the same character such as reflection, refraction with visible light, so the glance around the target objects without good environment (such as buildings, walls, signs) should be considered when a certain distance allowance;

Equipped with infrared projector lamp, in addition to its parameters also need to consider other. Today most of the infrared projector lamp on the market in 850 nm and 940 nm of these two bands, demand chooses the camera must be able to detect the wave band infrared light;

, rain, fog, dust and other climate conditions are restricting factors that affect its irradiation distance, in addition to the environment and the difference of monitoring target reflectivity, also can make its night vision effect have very big difference, so the test must be made before installation;

, as far as possible by electronic control switch device, its ability of fuzzy logic can effectively control the working state of the ICR - CUT filter. Because most manufacturers are using a simple way to control the ICR - such as photosensitive resistance sensor CUT filter, as well as the infrared projector lamp work On/Off state, the critical point of repeatedly jump less often.