What are induction loops used for?
An induction loop is a cable that goes around the listening area. It helps people who use a hearing aid or loop listener to hear sounds more clearly because it reduces or cuts out background noise. At home, for example, you could fit and use a loop system to hear sound from your television.
How do inductive loops work?
Inductive loops work like a metal detector as they measure the change in the field when objects pass over them. Once a vehicle drives over a loop sensor the loop field changes which allows the detection device to detect the presence of an object (mainly a vehicle).
What is an induction loop traffic?
The cycleways network in New South Wales uses an inductive loop detector as their form of detection. They are essentially a wire in the surface of the road that creates a magnetic field. When that magnetic field is broken by a metal object, it creates a pulse which allows for a phase to be called.
What is a gate loop?
INTRODUCTION. A loop detection system is a method of sensing vehicles and is typically used in automated gate applications to prevent a gate from automatically closing on a vehicle or to automatically open the gate when a vehicle is exiting a property.
What is an infrared system?
An infrared system uses infrared light to transmit sound. A transmitter converts sound into light and sends that light to the receiver worn by the hearing-impaired individual. Unlike the other systems, infrared cannot pass through walls.
How do induction loops detect traffic?
Inductive Loops Vehicles passing over the loop causes a change in the magnetic field that is induced in the loop for the time taken for the vehicle to pass over the loop. These work by detecting vehicles waiting on the loops and hence generating a constant change in the magnetic field in the loop.
Why traffic engineers use inductive loop detectors?
Inductive loops provide accurate vehicle detection data. They do this by detecting vehicles overhead as the metal of the vehicle causes a change in the magnetic field induced in the loop. This change in magnetic field causes a pulse which is registered by the signal controller.
What is a sensor loop?
The sensor loop used in the Loop Detector is basically an inductor. It is simply a coil of wire. An inductor or a reactor is a passive electrical component that can store energy in a magnetic field created by the electric current passing through it.
What is a driveway loop?
Driveway loops are an integral part of most automatic gate systems. They are used to command the gate to open or prevent it from closing on a vehicle in the path of the gate. They can also be used for peripheral activities such as turning on driveway lights or signaling a residence that a vehicle has arrived.
What is a shadow loop?
Shadow/Phantom/Center Loop: The Shadow Loop is placed under the swing path of a swing gate. This loop will check before the gate closes and/or opens to see if a vehicle is within the swing path, if a vehicle is within the swing path the gate will not move.
What is infrared system in wireless communication?
IR wireless is the use of wireless technology in devices or systems that convey data through infrared (IR) radiation. Infrared is electromagnetic energy at a wavelength or wavelengths somewhat longer than those of red light. Some engineers consider IR technology to be a sub-specialty of optical technology.
Where do you place the induction loop cable?
The induction loop cable shall be pulled carefully to avoid any damage in the insulation. Screeding concrete shall be packed above the PVC conduit and ensure that induction loop cable shall be placed 2″ below from the ground surface for proper installation. The loop detector shall be placed near the induction loop cable to avoid long runs.
What are the basics of inductive loop technology?
Inductive Loop Write up-2018-1 The Basics of Loop Vehicle Detection There are a number of ways to detect vehicles, ranging from hose style detection to ultra-sonic to inductive loop. For traffic control or drive-thru, inductive loop technology is the most reli- able, bar none.
How does an audio frequency induction loop work?
Audio-frequency induction loop systems do not use radio frequencies; they operate at audio frequencies. The signal from an audio source is fed into an induction loop amplifier, which amplifies and sets the signal level in the same way as a conventional amplifier.
What is the purpose of a loop extension cable?
Loop Extension Cable Loop extension cable is used to extend the distance from the preformed or saw-cut loop to the vehicle detector, which is usually located indoors or in a weatherproof enclosure. The character- istics of the extension cable are just as important as the characteristics of the loop wire.