Posts Tagged ‘ Passive InfraRed’



Motion Activated Security Camera

Written By:
Wednesday, April 6th, 2011

There are many purposes for using a motion activated security camera.  Portably, the most popular reason for using the motion activated security camera is to conserve electronic resources.  On the other hand, these cameras may be used for an entirely different reason; to provide alerts like an alarm system when something is there.

There are also several different types of motion activated security cameras.  In this article, we’ll explore how these cameras work, describe some of the more popular types, and talk about what how they may be used.

Many of today’s digital video camera security systems use wireless cameras.  This option provides great versatility in camera mounting types and locations.  A wireless camera does not require the usual RG-59 or similar type of cable to be run directly from the camera to the Digital Video Recorder or DVR and or monitor.

Instead, the camera has a built in radio transmitter and an on-board antenna.  It converts its video data into a radio signal and transmits it via the transmitter/antenna combination to a corresponding receiver or a DVR that contains a built in receiver.  As noted above, this can provide great freedom in cameral location and mounting choices.

However, the camera still needs a power supply.  So a power supply wire needs to be run from either a nearby outlet plug (if there is one) or from a power distribution box.  Since the wireless camera has gained great strides in achieving freedom from the wireless transmission, the power supply wire could possibly continue to restrict that freedom.  So, enter the new battery operated wireless, digital video security camera.

However, these cameras can place a hefty drain on batteries requiring frequent replacement or recharging.  So what is the solution to unnecessary battery drain?  A motion activated security camera.  These cameras contain an on-board motion detector that turns the camera on when it detects motion.  Since the motion detector itself consumes a fraction of the total power that a recording camera does, battery power is greatly conserved and battery life or recharging periods are greatly lengthened.

This same sort of principle is also used on hidden, disguised, or covert cameras.   Due to the nature of these cameras, they are often subjected to running on battery power.  Once again, a 12 hour recording of an empty room can not only be wasteful, but use tremendous amounts of battery life.  Make the device with a built in motion detector and the camera is now a motion activated security camera.

The types of cameras we’ve mentioned so far work by using a Passive InfraRed (PIR) motion detector.  The PIR has the ability to sample the average heat signature in the field of view of which it is aimed (usually the same field of view as the camera).  When an object with a different temperature than the surroundings, such as a body, a vehicle, etc. passes in front of the PIR it can detect this sudden change in the heat signature of the field of view.

The PIR interprets the heat signature change as an object in motion.  The PIR is connected to an electronic relay such that when motion is detected, the PIR tell the relay to turn the switch on to the camera and start recording.  The camera either stops when the PIR no longer detects motion or at a designated time period when after motion ceases.

There is another type of motion activated security camera that doesn’t work on the basis of Passive InfraRed activity.  This camera is usually left in an “on” state where it is constantly capturing the visual image in its field of view.  Instead of using a PIR, programming analyzes the video image that is being captured to determine if there is a change in any of the basic patters of the current field of view.

When a change is detected, the camera is activated such that although it is already on and capturing video images the camera now initiates processing and recording.  In other words on this type of system, the camera is on an capturing but not necessarily transmitting its video data to a monitor or DVR.  However, when the on-board programming detects a change in the otherwise motionless scenery, the camera initiates full recording and transmitting of its video signals.

This particular type of motion activated security camera is often used as a Pan-Tilt-Zoom camera that can track and follow objects based on the motion that it detects.

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Home Security Monitor Camera

Written By:
Friday, December 17th, 2010

A home security monitor camera can alert you to the arrival of any guests long before they reach your door. A home security monitor camera can also be used as a baby monitor to keep a watchful eye over your child while they are awake or asleep. Finally, a home security monitor camera used in conjunction with an electronic door can be used as an entry/exit monitor, allowing the user to see who is at the door and allowing them access without the need to greet them at the door.

These are just some of the specific uses for a home security monitor camera. Of course, the use of a home security monitor camera for protecting your property both inside and out is also common. Most home digital video security systems have security monitor cameras and monitors as well as a Digital Video Recorder (DVR) unit to record what the cameras capture for later viewing or other use.

Let’s take a closer look at some the uses for a home security monitor camera. Our first example states that a home security monitor camera can alert you to the arrival of any guests long before they reach your door. This is particularly useful for homes in very rural settings or homes with fairly long driveways from the road to the house.

In this instance a digital video camera, preferably an outdoor night vision infrared camera can be mounted outdoors on a pole, tree, or similar structure with its field of vision focused at the driveway. When people or vehicles approach the house, you will be able to see them far in advance of reaching your door.

A particularly useful feature for this application is a camera with a motion detector. The motion detector is a Passive InfraRed (PIR) sensor that detects changes in infrared energy. A sudden change indicates movement to the sensor which is connected to a relay. When the detector senses motion, it activates the relay which in turn initiates the camera to begin recording.

Another use for a home security monitor camera is a baby monitor. In this case DVRs are seldom used as real-time (live) monitoring of the baby is the focal point of using the monitor camera. In fact, these systems have become so popular that specialty baby monitor cameras are now sold apart from digital video security systems.

These units are usually wireless cameras and monitor/receivers. The camera is an indoor night vision infrared digital video camera. The camera works by using near infrared spectrum radiation to illuminate the field of vision. The infrared illumination is normally provided by an array of infrared Light Emitting Diodes (LEDs) that surround the camera lens. These LEDs provide illumination for the camera in the near infrared spectrum.

The camera has a sensor that can see this illumination, but the human eye cannot. Therefore, baby monitor cameras can provide high quality monochrome or black and white video in darkness and normal color video in visible light. When operating in the night time mode the camera will not disturb the baby’s sleep because the LED light can be seen by the human eye.

Another specialized use of a home security monitor camera is for entrance/exit control. A digital video camera is usually mounted in such a position that its field of view will include any individuals that come to your door. The cameras can include audio monitoring as well and when combined with a remote electronic switching mechanism can make a very effective sentry control device. In addition to using these cameras at door entrances they work extremely well when combined with remote gate openers at driveway entrances also.

These are just a few of the more common specialized uses for home security monitor cameras. There are many more applications for using a home security monitor camera. Another particularly nice feature of these cameras is that they are easy enough to install yourself. In fact, in most cases installing your own digital video security camera system shouldn’t take much more time than a weekend.

Security Camera King has a variety of home security monitor camera systems. If you are interested in purchasing a home security monitor camera or would like more information, contact one of our security experts today via live chat or telephone. Click on the “Live Chat” button at the top of the page or call 1-800-866-573-8878 from Monday through Friday 9AM-6PM EST.

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Church Security Systems and Surveillance

Written By:
Wednesday, October 20th, 2010

Have you considered protecting your places of worship with church security systems? Although a church building is sacred ground, unfortunately it is also a fairly popular target of burglaries and vandalism. However, with a church security system you can deter criminal acts and document them with video recordings if need be.

Whether the location is an urban or rural area, churches are a target for criminal acts, most likely because they may be empty for a scheduled extended period of time. Nothing fits a burglar’s or vandal’s time schedule better than an unguarded building with no people in it at a specified time. As a result, churches often are “targeted” by criminal intruders.

Digital video church security systems can help deter crime and provide police, insurance companies, and courts with evidence of the crime. Digital video security systems have become very popular in the last several years due to their affordable price and wide range of optional features.

Often, just the presence of digital video cameras is enough to deter a potential vandal or burglar. Add a 24/7 professional monitoring service, and your digital video church security system now acts as a burglar alarm as well. In fact, there are many ways to utilize digital video systems as burglar alarms.

A basic digital video church security system consists of one to several cameras, a Digital Video Recorder or DVR and a monitor. The digital video cameras capture images and sends them as digital video data to the DVR. The DVR, which also contains a digital video computer processor, compiles the data into a digital video file. The file can then be viewed on the monitor in real-time (live) and/or stored on the DVR for future use.

There are many types of digital video cameras that can be purchased with optional features to specifically meet your church security system needs. Since a church is often left unoccupied for several hours at a time, perhaps one of the best options would be a camera with a motion detector.

The motion detector is a Passive InfraRed (PIR) sensor that detects motion by changes in infrared radiation in the cameras field of view. The PIR sensor is built into the body of the camera and is attached to a relay that turns the camera’s video recording on. After the motion ceases or after a specified period of time with no motion detection, the video recording stops.

A church security system that utilizes cameras with motion detectors has many advantages. One advantage of this system, is that the motion detector camera conserves DVR storage by only recording when motion is detected. This means that, depending on the capacity of the DVR and the system, the hard disk drive can store several days to weeks of video.

Video files are stored on a DVR in sequence so that when the DVR storage disk becomes full, the drive begins rewriting new files over the oldest files. This gives the user a chance to copy important video using optional CDs or DVDs or even Flash drives. The portable media can be played on just about any type of personal computer and can be provided to police, courts, and insurance companies.

Another advantage of motion detector cameras used in church security systems is conservation of power. Digital video cameras require a power supply usually in the form of low-voltage DC (Direct Current) electricity. The power can be supplied in the form of a wire run from a power distribution center, a plug-in transformer, or rechargeable batteries. In the latter case, the motion detector camera greatly extends battery life between charges since the PIR uses only a nominal amount of constant power saving more power for video capture by the camera.

Another optional feature that may be useful for church security systems is day/night vision infrared cameras. Infrared cameras can record video in total darkness using near infrared spectrum light. Infrared light is invisible to the human eye, yet the camera can sense it. Since many areas of a church are often dark, these cameras are great for video security surveillance.

As you can see digital video systems can make great church security systems. If you have additional questions or are considering the purchase of a system, contact one of Security Camera King’s security experts today on-line by clicking the Live Chat button or call us at 1-866-573-8878 Monday through Friday from 9AM to 6pm est.

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