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The prospects for the development of infrared night vision ip camera

   With the security problem is becoming the focus of attention, the development of security monitoring technology was more and more paid attention by all sectors of society, visible light surveillance cameras can no longer meet the monitoring requirements, 24 hours of continuous monitoring equipment is a important part in monitoring system now. To achieve 24x7 monitoring, you need a night vision ip camera, the current cameras mostly with infrared night vision function. The infrared ip camera technology into a passive infrared technology and active infrared technology.
   Passive infrared camera technology is the use of any object can radiate electromagnetic waves principle above absolute zero (-273 ℃), due to the different objects and even the strength of the radiation capacity of the different parts of the same object, and the reflection of infrared and use of objects with background radiation environment differences and the scene itself, various parts of the difference of the radiation, the infrared detector can strength ranging radiation signal is converted into a corresponding electrical signal, and then amplified and video processing, for human eye observation of the video image is formed, The thermal image is able to render the various parts of the scene radiation downs, which shows the characteristics of the scene. Different the same goal thermal image and visible image, it is not the human eye can see visible light image, but the target surface temperature distribution image can not clearly identify the target of the detailed features, can not meet the requirements as "evidence", and becuase of the high cost of passive infrared ip cameras, they are used in the military field usually , few applications in the field of monitoring.
   Active infrared camera technology is the use of infrared light emitting diode to produce infrared radiation to produce the characteristics of the ordinary network camera able to capture infrared light, auxiliary lighting scene and environment in the human eye can not see, the use of the network camera's image sensor can feel infrared light feelings the surroundings reflected back infrared light to get a relatively clear picture of black and white images, night vision surveillance. Therefore, the infrared ip camera is now the majority of active infrared technology, surveillance cameras use infrared lights to match. Active infrared technology is relatively mature four forms:
   Traditional LED infrared lamps: a certain number of infrared light emitting diode matrix composed of luminous body, infrared emitting diodes made by a material of high infrared radiation efficiency PN, plus the forward bias voltage to the PN junction the injection current excitation infrared light, spectral power distribution center wavelength of 830 ~ 950nm, half peak bandwidth of about 40nm it is narrowband distribution in the CCD feelings; second-generation array integrated infrared light source: It uses state-of-the-art packaging technology on the basis of the original LED infrared technology dozens of high efficiency infrared crystals encapsulated in a plane, integrated IR light-emitting chips in a small range, and made a "thermal isolation" processing, so that the entire part can be placed in any size, any shape of heat on the body, so as to solve the heat problem, no longer because of the high temperature and hurt other peripheral electronic components; third generation of dot matrix infrared light source: it is a highly integrated LED array chip technology, single LEDArray output of about 800mW to 3.6W electro-optical conversion efficiency is about 25%, the light-emitting body is a single light source, the light-emitting angle is adjustable; infrared laser light is a semiconductor laser, is the use of semiconductor material in the complex process of the hole and electron, and the decrease of electron energy levels and the release of electrons to generating light energy, and then forming a laser photons in the resonant photon propagation direction specification. Good directional laser performance for the beam angle is small, the energy is concentrated, and spread to the far distance there is still enough light intensity, it is very suitable for long-distance lighting.
   Active infrared ip camera with the infrared emission lights, its advantages is capable of showing the details of the target characteristics, and lower cost. But the disadvantage is that the irradiation distance is relatively short, The imaging results easily affected by the environment, especially in the fog, snow, rain, a little bad weather, mainly applied to the detection of target; PIR network camera without the aid of an auxiliary light source, the advantage to penetrate strong, irradiation distance. The drawback is that only render target surface temperature distribution of images, mainly used in finding the target.
   The infrared ip camera market is quite confusing, mainly due to the industry's lack of unified standards. For example, the infrared lamp irradiation distance is often the highlight of each company propaganda, not quite the same with each other, whether irradiation distance is measured under the conditions in which environmental illumination and presented the picture quality is no way informed that it is currently facing the most severe test of the infrared ip camera market, to get rid of this problem has become the focus of common concern between enterprises. Active infrared technology early, only 5% efficiency, the development of efficient 25-30% LEDArray technology, to meet the short-range to long-range infrared night vision technology breakthroughs, and laser lighting technology is to achieve long-distance night One of the best way to view monitor, and light intensity than conventional light sources stronger and more long-range night vision technology is a trend of the future night vision ip camera market. Active infrared technology and the integration of passive infrared technology will be one of the trends of the future, the use of passive infrared technology penetrating power, irradiation distance to find the target, the use of the principle of active infrared lighting acquisition target detail features can remote monitoring to provide strong evidence. In addition, another night vision technology - shimmer technology integration is also one of the future direction of development, progress in the dim light and infrared technologies respective period, taking into account the complementary nature of the two, in addition to the existing based on technical difficulty, how to LLL image and infrared image fusion to get better observe the effect of the two technologies has become a hot research current night vision technology development.
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