What’s the infrared alarm system?

With the development of science and technology, before the kind of man with visible light cameras and surveillance video combination for the daily security of the Master is no longer used! Particularly at night and adverse weather conditions prevent lack of capacity is more!

In this case, the advance, the thermal imager, and video alarm system on there! This system is based uncooled infrared imaging system or hardware such as visible light camera systems, infrared / visible composite image, video, image processing and automatic alarm behavior analysis software with integration to existing video surveillance system to monitor labor under good weather, after the evidence but also to enhance all-weather conditions for the care-free man-made, computer automatic real-time alarm function.

System at night or adverse weather conditions (such as rain, fog, etc.) work, not only can save a lot of manpower, while the day when the weather allows real-time alarm. Not only to make up for the deficiencies of existing video surveillance systems, and improved security systems automatically identify and alert other related automation!

Uncooled infrared imaging system is a hardware system used to detect the target object’s infrared radiation, and by photoelectric conversion, signal processing means, the temperature distribution of the target object image is converted into a video image of the high-tech products, its core components and technologies for the FPA detector, the follow-up circuit, image processing software such as three parts. Focal plane detector for sensing the temperature distribution of the object, and converted to a weak electrical signal; follow-up circuit to a weak electric signal amplification and logic processing electronics, which can clearly capture objects to the target temperature distribution; image processing software is on the amplified output signal processing, showing the temperature distribution for the target object visible light image. According to infrared imaging system in the central part of – detectors work in different ways, thermal imager can be divided into cooling type infrared imaging system and non-cooling type infrared imager.

Video alarm system is digital, network-based video surveillance, monitoring based on computer vision technology to the scene of the video image content analysis to extract key information in the scene, and the formation of the corresponding event and alarm monitoring mode, a new generation of video-based content analysis of the monitoring alarm system. It on the video image of the target automatic monitoring, identification, tracking and analysis, and computer programs automatically filter through to filter out a large number of users do not care about video surveillance video.

By analyzing and understanding the contents of the video screen to provide users with useful for monitoring and alarm key information. Thus, video alarm analysis technology has changed the traditional passive acceptance of video surveillance experience model, change from passive to active to monitor the live video recording of the real-time analysis. In this project, the video surveillance system is mainly with illegal intrusion alarm, reverse running (walking) alarm function, alarm function remnants, wandering alarm function and infrared and visible image fusion, image enhancement, image to jitter, target lock and tracking.

Principles of infrared alarm

Infrared alarm system is divided into active and passive infrared alarm infrared alarm. Active infrared intrusion alarm system is formed by the transmitter and receiver, the transmitter is power, light source and optical system components, the receiver is the optical system, photoelectric sensors, amplifiers, signal processors and other components. Active infrared alarm system is a block-type infrared beam alarms, transmitters in the infrared light-emitting diodes in the power of the excitation, emits a modulated infrared beam (wavelength of this beam is about 0.8 ~ 0.95 microns), After the role of the optical system into a parallel light emission out. This beam is received by the receiver, the receiver of infrared photoelectric sensor to light signals into signals transmitted through the circuit after the alarm control treatment. Emitted by the infrared transmitter area to reach the receiver through the prevention, constitute a warning line.

Under normal circumstances, the receiver received a stable optical signal, when someone invaded the warning line, the infrared beam is blocked, the infrared receiver receiving the signal changes, extraction of this change, amplified, and appropriate treatment, controller issued the alarm signal. Currently there are two beams of such alarm, there are three multi-beam infrared beam fence so. Generally applied to the perimeter against the majority, the biggest advantage is to prevent range, can reach more than ten times the passive infrared detection range.

Passive infrared alarm system mainly based on changes in infrared energy from outside to determine whether it was moving. The body’s infrared energy and the environment makes a difference, when the people through the detection zone, alarm collected the different position of the infrared energy changes, and then by analyzing the alarm. The human body has a constant body temperature, usually 37 degrees, will issue a specific wavelength of about 10μm infrared, passive infrared alarm system is the human body by detecting the infrared emission around 10μm carry out the work. 10μm fired around the human body through the Fresnel filter infrared enhanced infrared sensors gather source. Infrared sensor source usually pyroelectric element, this element in the received infrared radiation temperature variations will lose the charge balance, charge-out release, the follow-up circuit by the managers will be able to generate alarm signal.

1. Passive infrared detecting human radiation alarm is the goal, so the pyroelectric element of the wavelength of about 10μm to be very sensitive to infrared radiation.

2. For only sensitive to infrared radiation on the human body, face to face in its radiation is usually covered with a special Fresnel filter, the interference of the environment are obvious controls.

3. The sensor consists of two series or in parallel with each other pyroelectric element. And two electrodes made from the opposite direction of environmental background radiation of the two pyroelectric elements almost have the same effect, to produce a pyroelectric effects offset each other, then no alarm signal output.

4. Once the person intrusion detection region, infrared radiation through the part of the mirror focus, the pyroelectric element was received, but the two pyroelectric element received different heat, pyroelectric are different can not be offset by the signal processing and alarm.

Home burglar alarm systems:

For example a family application:

If your home is Sanshiliangting, and a master bedroom, two Kewo, a living room, a restaurant, you can install the Office in each room or a detector, we assume the living room for the No. 1 defense area, restaurant for the first 2 zone, master bedroom to zone 3, Kewo 1 to 4 zone, Kewo 2 to 5 zone.

If thieves enter the living room is the host anti-theft alarm issued at the scene of high loudness of the siren, while scare thieves, the first panel indicator light, so the owner can know the location where thieves at this time. And so on, if the thieves to enter restaurants, master bedroom, Kewo one Kewo two anti-theft alarm host panel corresponding to the second, third, fourth, fifth light.

Infrared wireless alarm system:

For example 2, factory, warehouse applications:

If your plant, warehouse away from your home in less than ten kilometers, you can install the detector at the factory or warehouse, and the burglar alarm host at home, if thieves enter the factory or warehouse, the burglar alarm will be triggered, so that it will  remind you that someone has access to your factory or warehouse, so you make the appropriate measures to avoid loss of property.