Access control motion sensors are found everywhere today and function by detecting a vehicle or person approaching an exit and unlock the door. Motion sensors can take over the job of push-to-exit buttons. They are mounted right over the door at the inside of the door frame. Due to their motion sensor they can trigger motion and thus unlock the door right when you walk up to the door to exit the space. For example, it is very common to see in grocery stores, banks, or malls automatic doors that use a form of radar to detect when someone passes near the door to open. The box above the door sends out a burst of microwave radio energy and waits for the reflected energy to bounce back. When a person moves into the field of microwave energy, it changes the amount of reflected energy or the time it takes for the reflection to arrive, and the box opens the door. Since most of these devices use radar, they often set off radar detectors.
It is very common to see in grocery stores, banks, or malls automatic doors that use a form of radar to detect when someone passes near the door to open. Radar sensors work by "radiating electromagnetic energy and detecting the echo returned from reflecting objects". The box above the door sends out and waits for the reflected energy to bounce back. When a person moves into the field of microwave energy, it changes the amount of reflected energy or the time it takes for the reflection to arrive, and the box opens the door.
Unlike radar sensors, infrared sensors are passive; this means that instead of having to emit energy to detect changes, they are capable of detecting radiation. Passive infrared (PIR) motion detector technology uses infrared sensors. Sensors detect infrared energy that is emitted from human body heat. Infrared sensors are made from different materials that sense different ranges of infrared wavelengths. When an appropriate wavelength of infrared radiation strikes one of the material's cells, it changes the cell's resistance. By measuring the resistance of the cell, one can measure its infrared radiation. Since many different objects, both living and inert, emit a certain level of infrared radiation, it is convenient for the sensors to detect rapid changes in infrared radiation instead of a particular wavelength. When a sensor detects a rapid change, the increase in energy can trigger a burglar alarm system in your security system and alert the monitoring or police of the activity right away (usually both). Though, infrared energy is bound to fluctuate, the sensors are specifically designed to trigger when more rapid changes occur in the field. Another example is a motion sensor porch light, when the sensor detects a sudden change in infrared radiation and triggers the light to turn on.
The term Photocell (Photo-Beam, photo-eye) are a non-contact sensor that can be used to protect entrapment areas, when gate is moving open or closed. A photo-sensor motion detector uses focused light such as laser beam and a light sensor combination to detect movement or activity. In your home security system, the beam is aimed directly at the light sensor from a distance of space between rooms in your home. These motion sensors are typically used on a driveway or garage gate as a safety device. They are used to prevent a gate from closing on a vehicle in its path. They are also used to prevent a gate closing on a person who may be between the gate and a fence or wall. If someone travels between the light source and sensor, the blocked beam will trigger the alarm via control panel or box.
Vehicle Loops and Loop Detectors are used to detect the presence of a vehicle to open a gate, or as a safety device to prevent the gate from closing on a vehicle in its path. There is also the Inductive-Loop Traffic Detectors which is installed in the pavement and can detect vehicles passing or arriving at a certain point, for instance approaching a traffic light or in motorway traffic.
Push-To-Exit Buttons, also known as “Request-to-Exit”, are wall mounted buttons near the exit point and contain directions on a large green or red button. When the button is pressed it releases the door.
Push Bars, also known as Panic Bars, are reliable tools for opening locked doors from within a premise, attach across the inside of the door at the height of the door latch. Access control doors equipped with push bars are opened by simply pushing the horizontal metal bar, this action releases the latch and the door opens. It can be set to immediately lock upon closure due to a loaded spring located within the enclosed body.
Emergency Door Release, are available is two general types and are attach on a wall near the exit point. The first type is a “Break-Glass Emergency Release” button and to gain access to exit, you break the glass face. This action depresses a button inside the switch and releases the door. The second type uses is an “Emergency Door Release Pull Station” which is a pull-boxes with a T-bar handle imprinted with an arrow and the words “Pull Down”. When the T-bar is pulled down, the door is release.
Are you interested in automating an exit or entrance at your home or business by installing an access control motion sensor? If so, look no further! At Dicsan Technology, our professional and experienced technicians are ready to install or answer any questions you have about these systems. Contact Us
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Motion sensors are found everywhere today and function by detecting a vehicle or person approaching an exit and unlock the door. Due to their motion sensor they can trigger motion and thus unlock the door right when you walk up to the door to exit the space.Read More
Every access control system needs a server where the permissions are stored in an access database. It is really the server which makes the decision if the doors should unlock or not by matching the presented credential to the credentials authorized for this door.Read More
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